ENGLISHENGLISH
CONNECTING FP33 TRANSFORMER3. Slide the Limiter switch to the Off (down) position.
BALANCED OUTPUTS TO TELEPHONE LINES4. Adjust the Left Master gain control until the ac voltme-
In the Line position, the Left and Right XLR outputs can beter reading is at the desired peak output level.
used to drive dc-biased, ?dialed up? telephone lines,5. Open the battery compartment and turn the Peak LED
although there may be a slight increase in distortion. Use ofL trim pot completely clockwise.
the limiter circuit is strongly advised, with the FP33 limiter
6. Slowly adjust the trim pot counterclockwise until the
threshold set to +4 dBm. Modification of the FP33 output im-left Peak/Lim LED first illuminates red.
pedance to 600: is recommended for proper fidelity. (See7. Repeat the above procedure for the right Peak/Lim
the Internal Modifiable Functions section for instructions.)
LED, using the Peak LED R trim pot.
When connecting the FP33 to a telephone line in the United
States, use of an FCC-Registered interface adapter betweenHeadphone Level Adjustments
the mixer and the telephone line is mandatory. Outside theTo adjust the program level to match the audio signal
U.S., consult the local telecommunications authority.levels from a monitored source, proceed as follows:
1. Open the battery compartment and adjust the Head-
USER ADJUSTMENTS
VU Meter Adjustmentphone Level L and Headphone Level R ful counterclock-
wise.
To set the VU Meters to a value other than the factory2. Connect the device to be monitored via the 3.5 mm
setting (0 VU = +4 dBm), proceed as follows:Monitor In jack.
1. Connect a 600 : load across the Left XLR output set3. Move the Monitor Input Switch on the front panel to the
for Line.locking position (left).
2. Connect an ac voltmeter (such as the HP 400GL) in4. Adjust the monitor input level, using the headphone
parallel with the load.gain control on the front panel.
3. Slide the 1 kHz tone oscillator switch to the On (up)5. Move the Monitor Input switch on the front panel to the
position.post-master audio position (center).
4. Adjust the 1 kHz Tone Oscillator level with the Left6. Adjust the post-master audio to a comparable level,
(inside) Master gain control until the ac voltmeter read-using the Headphone Level L and Headphone Level
ing is at the level desired.R potentiometers.
5. Open the battery compartment door and adjust the
Left VU Level trim pot with a screwdriver until the LeftINTERNAL MODIFIABLE FUNCTIONS
VU Meter reads 0.Selected internal functions of the FP33 can be modified
6. Repeat the above procedure for the Right Output andby the user to fit special applications. Procedures for per-
the Right VU Meter.forming these modifications are listed below.
Limiter Threshold AdjustmentCAUTION: Due to the complex construction and exten-
sive use of surface-mount components, modifications to
To adjust the Limiter threshold to a value other than thethe FP33 must be performed by a qualified service techni-
factory setting (+15 dBm), proceed as follows:
cian. Contact the Shure Service Department or your au-
1. Connect a 600 : load and an ac voltmeter across thethorized Shure Service Center for further information on
Left Line output as described in steps 1 and 2 of thethese modifications.
VU Meter Adjustment procedure.
Disassembly
2. Open the battery compartment and move DIP switch
1 to the Off position (refer to the chart on the inside of1. Remove the six screws that secure the cover.
the door).2. Slowly slide the cover backwards and unplug ribbon
3. Slide the 1 kHz tone oscillator switch to the On (up)cable P109.
position.3. Remove the three screws (marked with arrows) that
secure the upper PC board.
4. Slide the Limiter switch to the Off (down) position.
5. Adjust the Left Master gain control until the ac voltme-4. Remove the upper PC board.
ter reading is 2 dB above the desired output level.5. Perform the appropriate modification procedure.
6. Slide the Limiter switch to the On (LIM) position.6. Reassemble the unit by doing Steps 1-4 in reverse.
7. Open the battery compartment and adjust the Lim AdjChanging the Line Level Output Impedance to 600 :
L trim pot until the level drops to the desired reading.1. Locate R674 and R668 on the bottom PC board and
8. Repeat the above procedure for the Right output, us-remove them.
ing the Lim Adj R trim pot.2. Locate X503 and X505 on the bottom PC board and sol-
der a 470 : 1/2W resistor through the holes at X503.
Peak LED Adjustment
To adjust the Peak LED threshold to a value other than3. Solder a 470 : 1/2W resistor through the holes at
X505.
the factory setting (+17 dBm), proceed as follows:
1. Connect a 600 : load and an ac voltmeter across theChanging the Tape Out Jack from Stereo (tip = L;
Left Line output as described in steps 1 and 2 of thering = R) to Mono (tip = L+R; ring = L+R)
VU Meter Adjustment procedure.1. Locate X504 on the top side of the lower PC board, by
2. Slide the 1 kHz tone oscillator switch to the On (up)the Tape Out jack.
position.2. Solder a jumper through the holes at X504.
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