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SIREN AND PA SYSTEM - TM-5-4210-220-34_34
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TM-5-4210-220-34 Truck Firefiighting 1000 GPM Multipurpose Model 2500L Manual
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SIREN AND PA SYSTEM - Continued - TM-5-4210-220-34_36
TM 5-4210-220-34 2-9. SIREN AND PA SYSTEM - Continued (3) When   Q301   and   Q302   are   replaced,   be sure  to  adjust  the  symmetry  of  the  output waveform   before   returning   the   module   to use.    To  do  this,    connect  a  5.5  ohm,  200 watt  dummy  load  across  pins  (5  and  6)  of P301 in place of the speakers.  Connect an oscilloscope   across   the   dummy   load   and activate  the  Yelp  signal.    Adjust  R158  on the  main   circuit   board   to   obtain   the   best possible square wave. 1. Self Tapping Screw, No.  8 X 1/2 in. 2. Knob 3. Main Circuit Board 4. Front Circuit Board 5. Fuse Holder 342002 R301 Potentiometer, 10K Ohm C301 Capacitor, 500 uF, 15 V, electrolytic C302 Capacitor, .001 uF, 100 V, Disc C303 Capacitor, .001 uF, 100 V, Disc C304 Capacitor, .005 uF, 100 V, Disc C305 Capacitor, .005 uF, 100 V, Disc Q301 Transistor, NPN, Silicone 2N5885 Q302 Transistor, NPN, Silicone 2N5885 T301 Output Transformer SW302 Slide Switch F301 Fuse, 20 amp, 3AG P301 Connector 8-pin J302 Connector, 12-pin J303 PCB Connector (4)     To  remove  the  main  circuit  board  remove the three screws that hold the board in  the siren module.  Disconnect the socket at the rear  of  the  board  and  lift  the  board  out  of the   module.      When   replacing   the   main circuit board, aline the socket at the rear so that the color dot on the socket is adjacent to  the  color  dot  on  the  circuit  board.    Also be  sure  that  the  two  plugs  on  the  front  of the circuit board mate properly with sockets on the front circuit board. (5)     To  remove  the  front  circuit  board,  remove the main  circuit  board  as  described  above. Loosen  control  knob  set  screws  and  slide the knobs from their control shafts. Remove   the   spanner   nuts   that   hold   the SELECTOR  and   the   GAIN   control   to   the front   panel   of   the   module.      Remove   the screw that holds the siren button bracket in place and lift out the circuit board. (6)     To test the main circuit board, the following tables    list    voltages    and    waveforms    that appear   on   the   integrated      circuits      and transistors  when the SELECTOR switch is set to its various positions 2-27

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