Shure Musical Instrument FP33 User Manual

Model FP33 User Guide  
STEREO ENG MIXER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1  
©2005, Shure Incorporated  
Printed in U.S.A.  
27B8500 (Rev. 3)  
 
ENGLISH  
ENGLISH  
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Precision, conductive plastic, sealed rotary input po-  
tentiometers  
Bi-color LED limiter and peak indicator for each output  
Two linkable output peak limiters with adjustable  
thresholds and release times  
Slate microphone and slate tone with selectable func-  
tions  
Isolated two-way talk-back using Monitor In and modi-  
fied Slate Mic/Tape Out jack  
High tolerance 3.5 mm jacks for stereo Tape Out and  
Monitor In  
1 kHz tone oscillator  
Mix bus jack and cable to link FP33 or FP32A mixers  
Headphone monitor mode switch to select L, L+R  
(Mono), R, or Stereo  
Internal headphone level adjustments to balance post–  
master audio levels and Monitor In levels at the head-  
phone output  
Selectable M/S decoding circuit for headphone monitor.  
Mixer/Monitor In switch (locking and momentary)  
Internal Monitor defeat switch for split-feed headphone  
operation  
Headphone volume control  
1/4 in. and 3.5 mm jacks for stereo headphone outputs.  
Customized operation via internal DIP switches, trim  
pots, slide switches, and optional jumpers  
Regulated voltage rails (r15 Vdc) provide exceptional  
GENERAL  
The Shure FP33 is a three-input, two-output portable ste-  
reo mixer designed for professional electronic news gather-  
ing (ENG), electronic field production (EFP), and on-loca-  
tion film production. The FP33 mixer sets a new standard  
for portable mixer performance and features. An exception-  
ally low-noise design makes the FP33 ideal for use with dig-  
ital transmission links or digital video and audio recording  
media, including DAT. Lightweight, compact, and rugged,  
the FP33 is designed to withstand the most demanding field  
production conditions.  
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All types of dynamic and condenser microphones may  
be used with the FP33. The mixer provides 48 V phantom,  
12 V phantom, and 12 V T (A-B) power for operating con-  
denser microphones. It will operate for at least 8 hours on  
two 9 V alkaline batteries. An external 12–30 Vdc power  
source, such as a Shure PS20 or PS20E ac adapter, may  
also be used.  
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Features  
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Exceptionally quiet design, suitable for use with DAT  
and other digital formats  
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Extended frequency response of 20 Hz–20 kHz  
Dynamic range greater than 100 dB  
Transformer balanced inputs and outputs for superior  
rejection of RFI and electromagnetic hum  
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Three selectable mic/line inputs  
Two selectable mic/line outputs  
Wide range input gain controls handle hot signal levels  
without attenuators  
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headroom  
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48 V phantom, 12 V phantom, and 12 V T (A-B) micro-  
phone power  
Pop-up pan pots  
Link switch gangs inputs 2 and 3 to control a stereo mi-  
crophone  
Switchable low-cut filters on each input  
Bi-color LED signal presence and peak indicator for  
each input  
Professional VU meters with selectable timed or  
toggled backlighting  
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Bi-color power On/Off LED  
Battery check switch and low battery warning LED  
Non-polarized external power jack  
External power operating range of 12 to 30 Vdc  
Soft-touch, color coded control knobs with raised posi-  
tion indicators  
Metal XLR input and output connectors  
Rugged, plated metal chassis  
Operates for 8 hours on two 9 V alkaline batteries  
Includes carrying case, shoulder strap, and mix bus cable  
Designed and manufactured in U.S.A.  
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Dual clutched Master gain control for simultaneous or  
separate adjustment of output levels  
1
 
ENGLISH  
ENGLISH  
4
5
2
3
6
1
7
8
9
10  
FP33  
1 kHz  
LINK  
ON  
SLATE  
PEAK/LIM  
BATT  
L
R
L
R
L
R
L
VU  
VU  
PAN  
PAN  
PAN/BAL  
MIC  
-2 -10-7-5 -3  
0
0
+3 +5  
L+R  
R
L
R
ST  
L
-20  
0
3
7
3
7
3
7
R
+3  
+5  
-10-7- -3  
-20  
5
0
LIM  
0
10  
0
10  
0
10  
+15  
PEAK/LIM  
1
2
3
MASTER dB  
MON  
14 15  
16  
18  
13  
17  
19  
12  
11  
Figure 1  
FRONT PANEL CONTROLS AND INDICATORS (Figure 1)  
1. Pan Control: Adjusts the amount of input signal sent  
to the Left and Right outputs. Each Pan knob has a  
center detent position. To avoid accidental movement  
of the knob once it has been set, it may be pushed in  
flush with the front panel.  
ies, the Battery Check indicates the status of the exter-  
nal operating voltage. When the mixer is using 9 V  
batteries and an external dc supply, the Battery Check  
indicates the status of the higher voltage source. A low  
battery condition also is indicated when the Power On  
LED changes to red and flashes at a slower rate. For  
instructions on modifying the FP33 to allow only inter-  
nal batteries or external power to be monitored at the  
VU meter, see Internal Modifiable Functions.  
Note: Pan Control 3 becomes a Left/Right Balance  
Control when the LINK switch is activated (see the  
LINK switch description for details).  
2. Input Level Bi-Color LED: Glows green to indicate  
the presence and relative level of an input signal. Also  
glows red if the input signal reaches 6 dB below the  
clipping (distortion) level. To program this LED so that  
Note: The audio signal is not interrupted when the  
Battery Check switch is activated.  
7. Output Peak/Limiter Bi-Color LED: Glows red for  
the individual Left and Right Channels when the out-  
put signal reaches a factory preset peak level of +17  
dBm. This peak level is user-adjustable from 0 dBm to  
+17 dBm. (See the Peak LED Adjustment instruc-  
tions.) If the Limiter is switched on, each LED glows  
green to indicate Limiter operation. The LED will still  
glow red if the preset peak level is reached before the  
Limiter activation point is reached.  
it functions only as a clipping level indicator, open the  
battery compartment and move DIP Switch 10 to the  
Off position.  
3. 1 kHz Tone Oscillator Switch: Use the 1 kHz tone to  
send a reference signal to any device connected to an  
FP33 output. The 1 kHz tone mutes all inputs. The tone  
level can be adjusted with the Master control.  
4. Link Switch: In the LINK position (up), this switch  
links the gain controls of Inputs 2 and 3 so they act as  
a stereo pair. Input 2 is Left and Input 3 is Right. The  
Input 3 Gain knob adjusts the level of the stereo pair.  
The Input 3 Pan knob adjusts the Left/Right balance.  
8. Slate Button: Activates a 400 Hz Slate Tone for one  
second and also activates the Slate Microphone. The  
Slate Microphone remains on while the button is de-  
pressed. The Slate signal (Tone and Mic) appears at  
the Left and Right outputs to identify the beginning of  
a take. If desired, the Slate features can be modified  
as follows: disable the Slate Tone; insert the Slate sig-  
nal pre-Master control; or insert the Slate signal post-  
Master control. See the Internal DIP Switches table for  
instructions.  
Note: Channel 2 Gain and Pan are disabled when the  
LINK switch is activated. The low-cut filters for Input 2  
and Input 3 are not linked.  
5. Slate Microphone: The built-in condenser micro-  
phone is activated when the Slate button is pressed.  
See the Slate Button section for more information.  
Note: To disable both the Slate microphone and the  
Slate tone, set internal DIP Switches 5, 6, and 7 to Off.  
Note: To disable both the Slate microphone and the  
Slate tone, set internal DIP Switches 5, 6, and 7 to Off.  
The Slate microphone may also be modified to act as  
a talk-back microphone for communications. Refer to  
the Internal Modifiable Functions section for details.  
9. Power On/Off Switch: Turns the mixer on and off.  
The mixer is on when this switch is in the “up” position.  
10. Power On LED: Monitors the higher of the internal or  
external voltage sources. Flashes green to indicate  
power is on and voltage is greater than 12 Vdc.  
Flashes red and slower to indicate low power (12 Vdc  
or less).  
6. Meter Lamp/Battery Check Switch: The Meter  
Lamp function is activated by momentarily pushing  
this switch upward. This function can be internally pre-  
set for timed or toggled deactivation. See the table in  
the Internal Switches and Controls section for details.  
When this LED monitors the internal battery level, it  
glows red typically when 30 minutes of battery power  
remain. Refer to the Internal Battery Life section. For  
instructions on modifying the FP33 to allow only in-  
ternal batteries or external power to be monitored at  
The Battery Check function is activated by momen-  
tarily pushing this switch downward. The status of the  
two 9 V batteries is indicated on the VU meter. When  
the mixer is using an external dc supply and no batter-  
2
 
ENGLISH  
the VU meter, refer to the Internal Modifiable Func-  
ENGLISH  
DIP Switches and Limiter Threshold Adjustment for  
instructions.  
tions section.  
11. Input Gain Control: Adjusts the gain level of each in-  
put channel. Rotating the knob counterclockwise re-  
duces the gain and raises the input clipping point. Use  
a low control setting to handle “hotter” input signals  
without distortion. With the FP33 input circuit, micro-  
phones with a “hot” output may be used without an in-  
line pad (attenuator). For best performance, adjust  
each Input Gain control so the associated Input Level  
LED illuminates red only on the loudest signal peaks.  
16. Left/Right Channel Output Level Meters: 0 VU is  
preset at a +4 dBm output level. This may be recali-  
brated for each meter by an internal trim potentiometer.  
See the VU Meter Adjustment paragraph for instruc-  
tions.  
Note: Mechanical meters are used because LCD me-  
ters do not operate properly in cold weather; fluores-  
cent meters drain batteries too quickly; and LED me-  
ters are difficult to see in sunlight.  
12. Input Low-Cut Filter Switch: Provides low-frequen-  
cy roll-off to reduce wind noise and rumble. When us-  
ing the filter, the frequency response is down 6 dB at  
150 Hz. The roll-off slope is 6 dB per octave.  
13. Master Gain—Right Channel Output: The outer  
ring controls the Right channel output gain. The dual-  
clutched control lets the Right and Left outputs be ad-  
justed individually. Set it to “0 dB” for unity gain.  
17. Monitor Input Switch: In the center position, this  
switch sends the post-master audio to the headphone  
output. In the left (locking ) or right (momentary) posi-  
tion, it sends the audio signal from the Monitor In jack  
to the headphone output.  
18. Headphone Gain Control (Inner Knob): Adjusts the  
headphone volume level.  
WARNING: The headphone circuit is capable of  
producing high volume levels that can damage the  
user’s hearing. Make sure the headphone volume  
setting is low (fully CCW) before putting on the  
headphones.  
14. Master Gain—Left Channel Output: The inner knob  
controls the Left channel output gain. The dual-  
clutched control lets the Right and Left outputs be ad-  
justed individually. Set it to “0 dB” for unity gain.  
Note: The 1 kHz tone oscillator level is set by the  
Master Level controls. To calibrate other devices,  
adjust the Master Level controls for a 0 VU re-  
sponse.  
19. Headphone Monitor Mode Switch (Outer Ring):  
The user can monitor the FP33 output as: Stereo; Right  
channel only; Mono (Left + Right); or Left channel only.  
15. Output Peak Limiter Switch: Activates two fast-act-  
ing, peak-responding limiters, one for each output  
channel. Limiters help prevent overload distortion  
from unexpected loud input signals. The limiter activa-  
tion is indicated by the Output Peak/Limiter LEDs,  
which illuminate green.  
Note: This switch also affects the Monitor In signal.  
When using a stereo MS microphone, such as the  
Shure VP88, the user may wish to pass the mic signal  
through the FP33 as separate Mid and Side signals,  
yet hear decoded stereo in the headphones. Using the  
Headphone MS Matrix, the user can monitor the FP33  
output as: Discrete (Mid and Side); Side only, Stereo  
(decoded MS), or Mono (Mid only). Refer to the Inter-  
nal DIP Switch table for instructions on activating the  
Headphone MS Matrix.  
The limiters may be changed to: operate indepen-  
dently; be linked as a stereo pair; activate at thresh-  
olds from 0 dBm to +15 dBm; and have release time  
constants of 0.1 second or 1 second. See the Internal  
3
 
ENGLISH  
ENGLISH  
1
IN  
1
MIC  
LINE  
MIC  
LINE  
MIC  
LINE  
1
2
3
2
Figure 2  
INPUT PANEL CONNECTORS AND CONTROLS (Figure 2)  
1. Channel Inputs: The three female XLR inputs are  
transformer balanced for superior rejection of hum,  
RFI, and other interference. Each input can provide  
48 V or 12 V phantom power (for condenser micro-  
phones); 12 V T (A-B) power (for condenser micro-  
phones); or no power (for dynamic microphones). See  
the Internal Switches and Controls section.  
2. Mic/Line Level Input Switch: Selects Microphone or  
Line to match the incoming signal level. The Mic signal  
level is typically 0.1–3 mV, and the Line signal level is  
typically 0.1–3.0 V. In the Line level position, phantom  
and T power are disconnected from the input.  
2
1
MIX BUS  
L
OUT  
R
TAPE  
OUT  
MON  
IN  
MIC LINE MIC LINE  
12-30 VDC IN  
6
7
4
5
3
Figure 3  
OUTPUT PANEL CONNECTORS AND CONTROLS (Figure 3)  
1. Mix Bus Jack: Allows an FP33 to be connected to an  
additional FP33 or FP32A mixer. A mix bus cable is  
supplied with every FP33. The Mix Bus connection is  
”two-way” and pre-Master. When two mixers are con-  
nected via the Mix Bus, all six inputs appear at both  
mixers’ outputs. The Master Gain control of either mix-  
er can be adjusted without affecting the output of the  
other. This provides the equivalent of a six-input stereo  
mixer with two separate Master output sections.  
In signal to the headphones. Program audio is not  
heard in the headphones when this switch is on.  
Note: A “split-feed” (FP33 audio in one ear and Monitor  
In audio in the other) can be accomplished via internal  
DIP Switches 4 and 5. Also, an internal modification will  
allow attenuated FP33 audio to be heard in the head-  
phones even when the Monitor In switch is activated.  
Refer to the Internal Modifiable Functions section.  
5. Tape Output Jack: A stereo 3.5 mm mini-phone jack  
(auxiliary level) to feed a cassette recorder, DAT ma-  
chine, or semi-pro video recorder. This output can be  
modified to provide a mono (L+R) signal; provide an un-  
balanced line level or mic level output; provide an iso-  
lated output containing only the Slate mic and Slate  
tone. Refer to the Internal Modifiable Functions section.  
Note: The output level of both mixers will drop by 6 dB  
when they are connected via the Mix Bus. Increase  
the Master Gain to compensate for this.  
2. Main Output: The two male XLR outputs are trans-  
former balanced and may be switched to Mic or Line  
Level. The Line Level output can be modified to a true  
600ꢀ:. See the Internal Modifiable Functions section.  
6. Mic/Line Level Output Switch: Selects Mic or Line  
Level to match the input level of the device connected  
to the FP33 output. The Mic signal level is typically  
0.1–3 mV; the Line signal level is typically 0.1–3 V.  
3. Headphones Outputs: A stereo 1/4 in. phone jack  
and a stereo 3.5 mm mini-phone jack may be used  
separately, simultaneously, or as auxiliary feeds to  
other equipment.  
7. 12–30 Vdc In Jack (External Power): This accepts  
a non-polarized coaxial plug from a 12 to 30 Vdc ex-  
ternal power supply. The external supply must have a  
negative ground or a floating ground. A Shure PS20  
or PS20E ac adapter, an automotive battery, or a re-  
chargeable belt pack are all suitable power supplies.  
4. Monitor In Jack: Designed to accept stereo line-level  
signals. This 3.5 mm jack provides a “tape return” in-  
put or a communications channel input. This signal  
appears only in the FP33 headphone circuit. Activat-  
ing the front panel Monitor In switch routes the Monitor  
4
 
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ENGLISH  
ENGLISH  
INTERNAL SWITCHES AND CONTROLS (Cont.)  
Note: Bold type indicates the Factory setting.  
DIP SWITCH  
POSITION  
ON  
FUNCTION  
1
LIM LINK  
Left and Right limiters act in tandem. If limiter thresholds are set differently, limiter action  
is determined by the lower threshold setting.  
OFF  
Left and Right limiters act independently.  
2
3
4
LIM RELEASE R  
LIM RELEASE L  
MON DEFEAT R  
SHORT  
Right limiter release time constant is 0.1 second. Use for speech.  
LONG  
Right limiter release time constant is 1 second. Use for music.  
Left limiter release time constant is 0.1 second. Use for speech.  
SHORT  
LONG  
Left limiter release time constant is 1 second. Use for music.  
OFF  
When front panel Monitor switch is activated, Monitor In signal is heard in Right head-  
phone.  
ON  
When front panel Monitor switch is activated, Monitor In signal is not heard in Right head-  
phone. Mixer audio remains in Right headphone.  
5
MON DEFEAT L  
OFF  
When front panel Monitor switch is activated, Monitor In signal is heard in Left headphone.  
When front panel Monitor switch is activated, Monitor In signal is not heard in Left head-  
phone. Mixer audio remains in Left headphone.  
ON  
6
7
8
9
PRE-MAST SLATE  
POST-MAST SLATE  
SLATE TONE  
ON  
Inserts slate tone and slate microphone into circuit before the Master gain control (pre–  
master). Slate level is controlled by Master.  
OFF  
ON  
Removes slate tone/slate microphone from pre-master cIrcuit.  
Inserts slate tone and slate microphone into FP33 circuit after the Master gain control  
(post-master). Slate level not is controlled by Master.  
OFF  
ON  
Removes slate tone and slate microphone from FP33 post-master circuit.  
Slate tone (400 Hz) sounds for one second when front panel slate button is pushed. Slate  
microphone also activates.  
OFF  
Slate tone does not sound when slate button is pushed. Slate microphone does activate.  
METER LAMP  
TOGGLED Lamp turns on/off when front panel lamp switch is toggled. Automatic timed turnoff of lamp  
will not occur.  
TIMED  
Lamp turns on/off when front panel lamp switch is activated. If not manually switched off,  
lamp will automatically turn off after 10 seconds to conserve battery life.  
10  
11  
PRESENCE LEDs  
ON  
Input LEDs illuminate green to indicate signal presence and relative level.  
OFF  
Input LEDs do not illuminate green. Input LEDs will still illuminate red to indicate 6 dB be-  
fore clipping.  
12 V OR 48 V PHANTOM  
12V  
Provides 12 Vdc phantom power if selected for channel input.  
48V  
ON  
Provides 48 Vdc phantom power if selected for channel input.  
12 MS MATRIX FOR  
HEADPHONES  
Inserts MS decoding matrix into headphone circuit. User can monitor in stereo while allow-  
ing separate Mic and Side signals to pass through the FP33.  
OFF  
Removes MS decoding matrix from headphone circuit.  
POWERING THE FP33 MIXER  
Mixer Operation  
Battery  
Current  
(mA)  
Battery  
Life  
(hours)*  
The FP33 can be powered by a 12–30 Vdc external power  
supply while preserving the life of the internal batteries.  
(A) Idle, no signal  
41  
46  
9
(B) As in (A) with +4 dBm continuous  
output  
7.8  
External Power Supplied  
11.4 Vdc to 30 Vdc  
<11.4 Vdc  
Internal Batteries  
OFF (200 PA current at 18 V)  
(C) As in (B) with three Shure SM81 mi-  
crophones at 12 V phantom power  
50  
57  
50  
63  
7.5  
6.0  
6.9  
5.5  
ON (Full power for the FP33 is sup-  
plied by the higher voltage source)  
(D) As in (B) with three Shure SM81 mi-  
crophones at 48 V phantom power  
BATTERY LIFE  
(E) As in (B) with 63 : headphones  
driven moderately loud (Sony MDRV6)  
The FP33 is designed for low current consumption.  
Under typical conditions (+4 dBm into 600 : in continuous  
use and no phantom–powered microphones, meter illu-  
mination, or headphones in use), and with two fresh 9 volt  
alkaline batteries , the FP33 will operate for about eight  
hours before the Power LED flashes. At this point, about 30  
minutes of battery life remain. If more mixer features are  
used, battery life will decrease accordingly (see table).  
(F) As in (B) with meter illumination  
continuously on  
*Until Power LED begins to flash, and allowing 30 minutes to replace  
batteries.  
Note: Momentary use of headphones or meter illumina-  
tion will not appreciably affect battery life.  
6
 
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ENGLISH  
ENGLISH  
3. Slide the Limiter switch to the Off (down) position.  
CONNECTING FP33 TRANSFORMER  
BALANCED OUTPUTS TO TELEPHONE LINES  
In the Line position, the Left and Right XLR outputs can be  
used to drive dc-biased, “dialed up” telephone lines,  
although there may be a slight increase in distortion. Use of  
the limiter circuit is strongly advised, with the FP33 limiter  
threshold set to +4 dBm. Modification of the FP33 output im-  
pedance to 600ꢀ: is recommended for proper fidelity. (See  
the Internal Modifiable Functions section for instructions.)  
When connecting the FP33 to a telephone line in the United  
States, use of an FCC-Registered interface adapter between  
the mixer and the telephone line is mandatory. Outside the  
U.S., consult the local telecommunications authority.  
4. Adjust the Left Master gain control until the ac voltme-  
ter reading is at the desired peak output level.  
5. Open the battery compartment and turn the Peak LED  
L trim pot completely clockwise.  
6. Slowly adjust the trim pot counterclockwise until the  
left Peak/Lim LED first illuminates red.  
7. Repeat the above procedure for the right Peak/Lim  
LED, using the Peak LED R trim pot.  
Headphone Level Adjustments  
To adjust the program level to match the audio signal  
levels from a monitored source, proceed as follows:  
1. Open the battery compartment and adjust the Head-  
phone Level L and Headphone Level R ful counterclock-  
wise.  
USER ADJUSTMENTS  
VU Meter Adjustment  
To set the VU Meters to a value other than the factory  
setting (0 VU = +4 dBm), proceed as follows:  
2. Connect the device to be monitored via the 3.5 mm  
Monitor In jack.  
1. Connect a 600 : load across the Left XLR output set  
for Line.  
3. Move the Monitor Input Switch on the front panel to the  
locking position (left).  
2. Connect an ac voltmeter (such as the HP 400GL) in  
parallel with the load.  
4. Adjust the monitor input level, using the headphone  
gain control on the front panel.  
3. Slide the 1 kHz tone oscillator switch to the On (up)  
position.  
5. Move the Monitor Input switch on the front panel to the  
post-master audio position (center).  
6. Adjust the post-master audio to a comparable level,  
using the Headphone Level L and Headphone Level  
R potentiometers.  
4. Adjust the 1 kHz Tone Oscillator level with the Left  
(inside) Master gain control until the ac voltmeter read-  
ing is at the level desired.  
5. Open the battery compartment door and adjust the  
Left VU Level trim pot with a screwdriver until the Left  
VU Meter reads 0.  
6. Repeat the above procedure for the Right Output and  
the Right VU Meter.  
INTERNAL MODIFIABLE FUNCTIONS  
Selected internal functions of the FP33 can be modified  
by the user to fit special applications. Procedures for per-  
forming these modifications are listed below.  
CAUTION: Due to the complex construction and exten-  
sive use of surface-mount components, modifications to  
the FP33 must be performed by a qualified service techni-  
cian. Contact the Shure Service Department or your au-  
thorized Shure Service Center for further information on  
these modifications.  
Limiter Threshold Adjustment  
To adjust the Limiter threshold to a value other than the  
factory setting (+15 dBm), proceed as follows:  
1. Connect a 600 : load and an ac voltmeter across the  
Left Line output as described in steps 1 and 2 of the  
VU Meter Adjustment procedure.  
2. Open the battery compartment and move DIP switch  
1 to the Off position (refer to the chart on the inside of  
the door).  
3. Slide the 1 kHz tone oscillator switch to the On (up)  
position.  
4. Slide the Limiter switch to the Off (down) position.  
5. Adjust the Left Master gain control until the ac voltme-  
ter reading is 2 dB above the desired output level.  
6. Slide the Limiter switch to the On (LIM) position.  
7. Open the battery compartment and adjust the Lim Adj  
L trim pot until the level drops to the desired reading.  
Disassembly  
1. Remove the six screws that secure the cover.  
2. Slowly slide the cover backwards and unplug ribbon  
cable P109.  
3. Remove the three screws (marked with arrows) that  
secure the upper PC board.  
4. Remove the upper PC board.  
5. Perform the appropriate modification procedure.  
6. Reassemble the unit by doing Steps 1–4 in reverse.  
Changing the Line Level Output Impedance to 600 :  
1. Locate R674 and R668 on the bottom PC board and  
remove them.  
2. Locate X503 and X505 on the bottom PC board and sol-  
der a 470 :ꢁ 1/2W resistor through the holes at X503.  
3. Solder a 470 :ꢁ 1/2W resistor through the holes at  
X505.  
8. Repeat the above procedure for the Right output, us-  
ing the Lim Adj R trim pot.  
Peak LED Adjustment  
To adjust the Peak LED threshold to a value other than  
the factory setting (+17 dBm), proceed as follows:  
Changing the Tape Out Jack from Stereo (tip = L;  
ring = R) to Mono (tip = L+R; ring = L+R)  
1. Locate X504 on the top side of the lower PC board, by  
the Tape Out jack.  
1. Connect a 600 : load and an ac voltmeter across the  
Left Line output as described in steps 1 and 2 of the  
VU Meter Adjustment procedure.  
2. Slide the 1 kHz tone oscillator switch to the On (up)  
position.  
2. Solder a jumper through the holes at X504.  
8
 
ENGLISH  
ENGLISH  
C in PF= (85/frequency) - .33  
Example for 200 Hz corner frequency  
85/200 = .43  
Decreasing Tape Out Level to Mic Level  
1. Locate R1112 and X511 (the top side of the bottom PC  
board, by the L Out XLR connector).  
.43-.33 = .1 PF  
For a 200 Hz corner frequency, use a 0.1 PF capacitor.  
2. Locate R1114 and X510 (the bottom side of the bottom  
PC board, by the Tape Out jack).  
3. Remove R1112 and R1114.  
Note: The capacitor must be a ceramic or film type,  
non-polarized, with a 16 V or higher rating.  
4. Solder a jumper through the holes at X511.  
5. Solder a jumper through the holes at X510.  
2. For Input 1, locate X811 and X812. Solder the new ca-  
pacitor between these points.  
3. For Input 2, locate X813 and X814. Solder the new ca-  
pacitor between these points. Also locate X815 and X816  
on the bottom board, just behind the input gain controls.  
Solder another new capacitor between these points.  
4. For Input 3, locate X809 and X810 on the bottom  
board, just behind the input gain controls. Solder the  
new capacitor between these points.  
Increasing the Tape Out Level by +10 dB  
1. Locate R669 and R672 on the bottom PC board.  
2. Remove these two resistors.  
3. The Tape Out impedance is now 6 k:.  
Changing the Slate Mic and the Slate Tone to Feed  
Only the Tape Out Jack  
5. To raise the corner frequency higher than the factory  
preset of 260 Hz, contact the Shure Technical Applica-  
tion Group at (847) 866-2525.  
This modification provides an isolated, unbalanced out-  
put for talk-back. For example, the user could talk to a  
boom operator though the Slate mic. The Monitor In func-  
tion could be used to hear the boom operator’s response.  
Slowing Down Output Level Meters to Approximate  
“True VU” Ballistics  
1. Locate and remove R663, R669, R670, R672, R673,  
and R765 from the bottom PC board.  
1. Locate empty pads C302 and C303 on the top PC  
board, behind the power switch.  
2. Solder a 150ꢀPF x 6.3 V electrolytic capacitor in C302.  
The + lead must face the meters.  
3. Solder a 150ꢀPF x 6.3 V electrolytic capacitor in C303.  
The + lead must face the meters.  
4. To slow the meter response even more, further in-  
2. Solder a jumper through the holes at X504 (behind the  
Tape Out jack).  
3. Solder one end of an insulated jumper into the hole at  
X600 (about 40 mm [1.5 in.] behind the Tape Out jack).  
4. Solder the other end of this jumper to the jumper at X504.  
5. Set the Pre-Mast Slate DIP switch (#6) to On.  
6. Set the Post-Mast Slate DIP switch (#7) to Off.  
crease the PF value of C302 and C303.  
7. The nominal Tape Out level is now –10 dBV (aux level).  
The Modified Tape Out contains only the Slate tone and  
Slate microphone. The Slate tone and Slate micro-  
phone are removed from the main outputs.  
Changing Battery Indicators to Monitor Internal or  
External Power  
The following modifications allow only the internal bat-  
teries or the external power supply to be monitored at the  
VU meter.  
Providing Mixer Audio in the Headphones when the  
Monitor Switch is Activated  
Modification:  
Procedure:  
To monitor external To monitor internal  
This modification allows the user to listen to the monitor  
input signal and attenuated mixer audio simultaneously.  
power only  
battery power only  
Remove R492  
Remove R490  
1. Locate X501 and X502 on the bottom PC board.  
2. Determine the amount of attenuation desired for mixer  
audio, using the following table.  
The following modifications allow the Red/Green Power  
LED to indicate low voltage status for only the internal bat-  
tery or the external power supply.  
Mixer Audio Attenuation  
Required Resistor  
Impedance  
Modification:  
To indicate low ex- To indicate low in-  
ternal power only  
ternal battery pow-  
er only  
Less than 10 dB  
10 dB  
Less than 150 k:  
150 k:  
Procedure:  
Remove R493  
Remove R491  
15 dB  
300 k:  
Other Available Modifications  
Greater than 15 dB  
Greater than 300 k:  
x
x
x
x
x
x
x
Changing VU Meter Scale for Battery Voltage Indication  
Converting FP32 to FP32A or FP33 Mix Bus  
Increasing Output Level of Slate Mic  
3. Solder a 1/8W or 1/4W resistor through the holes at  
X501.  
4. Solder a 1/8W or 1/4W resistor through the holes at  
X502.  
Power LED Red Flashing Point  
5. Activate the Monitor In switch. FP33 audio will be atte-  
nuated by the predetermined level.  
Reduction of Headphone Circuit Output Impedance  
Single Output Level Control  
Decreasing the Low-Cut Filter Corner Frequency  
(3 dB down point)  
XLR Connector Change from Female to Male  
For further information about these modifications, call  
1. Calculate a new capacitor value for the lower low-cut  
corner frequency. Use the following formula:  
the Shure Technical Application Group at (847) 866–2525.  
9
 
ENGLISH  
ENGLISH  
Overload and Shorting  
SPECIFICATIONS  
Shorted outputs, even for prolonged periods, cause no  
damage. Microphone inputs of up to 3 Vrms cause no  
damage. The Line and monitor inputs can withstand sig-  
nals of up to 30 Vrms.  
Measurement conditions, unless otherwise specified: Op-  
erating Voltage: 18 Vdc  
Full gain  
1 kHz input signal.  
Output terminations: Line 600 :ꢂꢀ Mic 150 :ꢂꢀ  
Tape Out 50 k:ꢁꢀHeadphoneꢀꢃꢄꢄꢀ:ꢅ  
Input Channel Bi-Color LEDs  
Green: Signal presence; visual indication of mix level.  
Red: 6 dB below clipping level.  
Output Peak/Limiter Bi-Color LEDs  
Frequency Response  
20 to 20,000 Hz r2.0 dB (channel controls centered).  
Green: Output being limited by 1 dB or more.  
Red: Output peak threshold reached; factory set at  
+17 dBm; user adjustable from 0 to 17 dBm.  
Voltage Gain  
Output Clipping Level  
t +18 dBm at line output into 600ꢀ:ꢅ  
Input  
Line  
Mic  
Headphone  
Tape  
Low-Z  
Mic  
(150 :)  
78 dB  
28 dB  
89 dB  
66 dB  
Low–Cut Filters  
6 dB down at 150 Hz; 6 dB/octave slope.  
Line  
28 dB  
––  
–22 dB  
––  
39 dB  
11 dB  
16 dB  
––  
Pan Attenuation Level  
45 dB.  
Monitor  
Tone Oscillator  
1 kHz r10%.  
Inputs  
Slate Tone Oscillator  
400 Hz r10%.  
IMPEDANCE  
Input  
Designed for  
Use with  
Actual  
(Internal)  
Input Clip  
Level  
Limiter  
Threshold: Adjustable; 0 dBm to +15 dBm.  
Mic  
Line  
19 to 600 :  
d10 k:  
1 k:  
–10 dBV  
+36 dBV  
+21 dBV  
Attack Time: 1 ms.  
50 k:  
10 k:  
Release Time Constant: Selectable; 100 ms or 1 s.  
Indicator: Green when limiting by 1 dB or more.  
Monitor  
d 1 k:  
Microphone Power  
12 V Phantom: 12 V through matched 680 :.  
48 V Phantom : 48 V through matched 6.8 k:.  
12 V T (A–B):12 V through matched 180ꢀ:.  
Outputs  
Input  
IMPEDANCE  
Mixer Power  
Designed for  
Use with  
Actual  
(Internal)  
Output Clip  
Level  
Internal: Two 9 V alkaline batteries.  
External: 12–30 Vdc to dc In jack; non–polarized.  
Current Drain: Approximately 41 mA (idle) at 18 V.  
Battery Life: 8 hours minimum, typical.  
Mic  
Low-Z  
inputs  
1 :  
–31 dBV  
Line  
Tape  
600 :  
>10 k:  
150 :  
2.2 k:  
300 :  
+18 dBm  
+3 dBV  
Temperature Range  
Operating: 0q to 60q C (32q to 140q F).  
Storage: –40q to 85q C (–40q to 185q F).  
Headphones  
8 to 200 :  
+11 dBV  
Overall Dimensions (H x W x D)  
58 mm x 184 mm x 161 mm (7–1/4 x 6–3/8 x 2–1/4 in.).  
Total Harmonic Distortion  
0.25% THD at +4 dBm output, 50 to 20,000 Hz.  
Net Weight (without batteries)  
1.6 kg (3.5 lbs).  
Equivalent Input Noise  
–127 dBV with 150 : source, 20 to 20,000 Hz.  
FURNISHED ACCESSORIES  
Carrying Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26A19  
To wrap the carrying case around the FP33 mixer, refer  
to the assembly instructions supplied.  
Output Noise  
Master level fully CCW: d –100 dBV, 20 to 20,000 Hz.  
Master level fully CW: d –80 dBV, 20 to 20,000 Hz.  
Shoulder Strap . . . . . . . . . . . . . . . . . . . . . . . . . . 95A8508  
Connect the strap’s swivel hooks to the metal ears lo-  
cated on the FP33 side panels.  
Common Mode Rejection Ratio  
65 dB at 100 Hz, –20 dBV input.  
Mix Bus Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . 90A4313  
A three-conductor, shielded cable 205 mm (8 in.) long  
with a female 3-pin mini- connector at each end.  
Polarity  
Mic/Line In to Mic/Line Out  
Mic/Line In to Headphones  
Mic/Line In to Tape Out  
Mic/Line to Mix Bus  
Non-Inverting  
Non-Inverting  
Non-Inverting  
Inverting  
Rubber Feet . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66A8010  
If desired, these adhering feet may be placed on the bot-  
tom or the rear of the FP33 mixer.  
Monitor In to Headphones  
Non-Inverting  
Spare Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . 187AJ06A  
10  
 
ENGLISH  
ENGLISH  
nications. These limits are designed to provide reasonable  
protection against harmful interference in a residential  
installation. This equipment generates, uses, and can  
radiate radio frequency energy and, if not installed and  
used in accordance with the instructions, may cause  
harmful interference to radio communications. However,  
there is no guarantee that interference will not occur in a  
particular installation. If this equipment does cause harm-  
ful interference to radio or television reception (which can  
be determined by turning the equipment off and on), the  
user is encouraged to try to correct the interference by one  
or more of the following measures:  
CERTIFICATION  
Eligible to bear CE Marking. Conforms to European EMC  
Directive 89/336/EEC. Meets applicable tests and perfor-  
mance criteria in European Standard EN55103 (1996)  
parts 1 and 2, for residential (E1) and light industrial (E2)  
environments.  
Note: Under extreme conditions of electrostatic dis-  
charge to the VU Meter Lamp Switch, the VU meter  
may illuminate. This is normal and causes no harm.  
INFORMATION TO USER  
1. Reorient or relocate the receiving antenna.  
Changes or modifications not expressly approved by  
Shure, Inc., could void your authority to operate this equip-  
ment.  
2. Increase the separation between the equipment and  
the receiver.  
3. Connect the equipment into an outlet on a circuit differ-  
ent from that to which the receiver is connected.  
This equipment has been tested and found to comply  
with the limits for a Class B digital device pursuant to Part  
15 of the FCC Rules and as set out in the Radio Interfer-  
ence Regulations of the Canadian Department of Commu-  
4. Consult your dealer or an experienced radio/TV tech-  
nician.  
11  
 
SHURE Incorporated http://www.shure.com  
United States, Canada, Latin America, Caribbean:  
5800 W. Touhy Avenue, Niles, IL 60714-4608, U.S.A.  
Phone: 847-600-2000 U.S. Fax: 847-600-1212 Int’l Fax: 847-600-6446  
Europe, Middle East, Africa:  
Shure Europe GmbH, Phone: 49-7131-72140 Fax: 49-7131-721414  
Asia, Pacific:  
Shure Asia Limited, Phone: 852-2893-4290 Fax: 852-2893-4055  
 

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