TM 55-4920-328-13 KEY TO FIGURE 1-26. 1. No.  2 Power Control Panel Assembly 2. HYD Temp High Indicator DS1 3. Start System Drive Indicator DS2 4. Start/Run Switch S1 5. HYD Starter Engine Speed Switch S2 6. Left Console Fan 2-Speed Switch S25 7. Inst PWR on Switch S1 8. Brake Pump Start Switch S3 9. Cooling Pump Start Switch S5 10. Tower Fan No.  1 Start Switch S7 11. Tower Fan No.  2 Start Switch S9 12. Air Comp Start Switch S11 13. Lube Pump Start Switch S13 14. Oil Pre-Heat On Switch S15 15. Oil Pump Start Switch S17 16. Fuel Pump Start Switch S19 power  supply  and  one  MDL  1/2  AMP  fuse  is  mounted inside on the 400 Hz oscillator board. 5.    28   VDC   utility   power   supply   assembly 4A4.    The  28v  dc  utility  power  supply  assembly  (48, figure  1-25)  is  a  standard,  19-inch,  rackmounted  unit installed   near   the   bottom   of   the   front   portion   of   the services  sub-module  (Unit  4).    The  unit  consists  of  a chassis assembly utilizing a front panel and a track slide assembly  on  each  side  panel  of  the  unit.    The  front panel  is  provided  with  left  and  right  handles  and  four retaining  screws  to  facilitate  attachment  in  the  cabinet assembly.  The power supply unit is located on the rear side  of  the  front  panel.    The  front  panel  mounts  a  dc voltmeter   and   a   dc   ammeter.      The   voltmeter   has   a range of 0 to 36v dc and the ammeter has a range of 0 to  20  ADC.    A  combination  on-off  switch  and  circuit breaker  is  located  on  the  front  panel  between  the  two meters.  Voltage and current controls are located below the corresponding meter on the front panel.  Input power to the unit is connected at two 1/4-28 UNF studs on the rear panel.  Two connectors A4J1 and A4J2 are installed on  the  rear  face  of  the  unit  for  connection  with  other electrical components of the system.  Refer to table 1-1 for  additional  leading  particulars  of  the  28v  dc  utility power supply assembly. (i)    Control power module (Unit 5).  The control  power  module  (figure  1-26)  consists  of  a  sheet metal bridge which provides an enclosure and mounting surface  for  two  power  control  panel  assemblies.    The bridge is 41.00 inches wide, 9.75 inches high, and 16.38 inches deep.  The significant components are described in the following text. 17. Flood Lights On Switch S21 18. Right Console Fan 2-Speed Switch S26 19. Beacon On Switch S23 20. Beacon Off Switch S24 21. Flood-Lights Off Switch S22 22. Fuel Pump Stop Switch S20 23. Oil Pump Stop Switch S18 24. Oil Pre-Heat Off Switch S16 25. Lube Pump Stop Switch S14 26. Air Comp Stop Switch S12 27. Tower Fan No.  2 Stop Switch S10 28. Tower Fan No.  1 Stop Switch S8 29. Cooling Pump Stop Switch S6 30. Brake Pump Stop Switch S4 31. Inst PWR Off Switch S2 32. No.  1 Power Control Panel Assembly 1.   No.    2  Power  control  panel  assembly. The No.  2 power control panel assembly (1, figure 1-26) consists of a chassis assembly 19.00 inches wide, 6.97 inches    high,    and    8.70    inches    deep.        The    chassis assembly  front  panel  mounts  a  START/  RUN  SWITCH (4), a START SYSTEM DRIVE indicator (3), and a HYD TEMP  HIGH  indicator  (2).    Terminal  board  assembly TB1 is installed in the chassis assembly.  The rear panel mounts connector J1 for connection of internal components with starting system circuits. The START/RUN switch (4) is positioned to START, to start the gasoline-driven engine in the hydraulic start system. When  the  engine  reaches  normal  operating  speed  and the  associated  hydraulic  pump  is  prepared  to  deliver system pressure, the START SYSTEM DRIVE indicator light (3) comes on.  At this time, the START/RUN switch is positioned to RUN.  If hydraulic fluid temperature rises above a pre-set limit, a thermal switch opens to interrupt the ignition circuit to the gasoline engine and deenergize a solenoid-operated valve to shut off hydraulic power to the  engine  hydraulic  starter.    The  HYD  TEMP  HIGH indicator  (2)  comes  on  to  indicate  and  out-of-tolerance condition   in   the   hydraulic   start   system.      Control   of engine speed is maintained by adjusting the position of the    HYD    STARTER    ENGINE    SPEED    switch    (5). Operating instructions for the hydraulic start system are provided in chapter 3. 2.    No.      1   Power   control   panel   assembly. The No.  1 power control panel assembly (32, figure 1- 26)  utilizes  a  chassis  assembly  which  mounts  a  front panel  19.00  inches  wide,  6.97  inches  high,  and  8.70 inches deep.  The front panel is equipped with left and right handles and 1-52