TM  55-4920-402-13&P accomplishlised in actual use of the equipment at the flight line. Therefore, at AVIM (CRC) maintenance, it will only he necessary to refer to the apllicable paragraph in this section that relates   to   the   defective component,. Troubleshooting is presented in the same sequence as the VIBREX checkout procedures contained in Chapter 3, Section II. NOTE Aviation Intermediate Maintenance (CRC) will    perform    only    the    authorized maintenance   which   includes   replacement and repair of components and end items in- dicated on the Maintenance Allocation Chart which can be accomplished efficiently with available skills, tools, and test equipment. Evacuate  unserviceable  circuit  boards/com- ponents  and  end  items  beyond  capability  of CRC to the Depot. 4-11. Balancer Tests. Perform performancc checks (a) thru (b) only when directed by the troubleshooting pro- cedure Table 4-17 or when applicable. a.  Perform  Balancer  resistance  checks  as  applicable  in Table 4-1.  Figure  4-5  shows  the  location  of  Balancer  test points. b. Remove rear cover by removing four screws. CAUTION Disconnect + 28 vdc power source before making resistance checks with a multimeter. c. Voltage Test. (1)   Connect   +28   vdc   power   supply   only   to Balancer as shown in Figure 4-6. (2) Set Balancer RPM Dial to 100. (3) Use VOM to measure voltages at test point in Table 4-2. Table 4-2. Ba1ancer Voltage Checks From  (+) TP1 TP2 TP3 T’P4 TP5 TP6 TP7 TP8 TP9 TP10 TP11 TP12 TP13 TP14 P1201 pin B P1201 pin A (gnd) P1201 pin A Chassis TP5 TP6 NOTE: RESISTANCE To (-) Circuit   ground Circuit   ground Circuit   ground Circuit   ground Circuit   ground Circuit   ground Circuit ground Circuit   ground Circuit   ground Circuit   ground Circuit   ground Circuit   ground Circuit ground Circuit   ground Voltage 0 ± 0.5 vdc 0 ± .02 vdc 0 ± .02 vdc -7 ± 0.1 vdc +9 ± 0.9 vdc -9 ± 0.9 vdc 8 ± 1.0 vdc 0 ± .02 vdc 0 ± .02 vdc -8 ± 1.0 vdc 0 ± .02 vdc 0 ± .02 vdc 0 ± .02 vdc 0 ± .02 vdc Table  4-1.  Balancer  Power  Supply  Resistance  Checks From (+) To (-) Resistance NOTE: CIRFUIT  GROUND  IS LOCATED   ON R/H  TER- MINAL   OF  C-123 P1201 pin A (grid) 4 to 6 k P1201 pin B Greater than 1M Circuit   ground 0 Circuit   ground l K Circuit  ground 3 K to 6 K Circuit  ground 2 K to 20 K READINGS MAY DIFFER FROM THOSL SHOWN AS SEMICONDUCTORS  EXH!B!T NON-LINEAR RESISTANCE  CHARACTERISTICS 4-8 Change  4