TM 10-4610-232-34
Table 2-1. Direct Support Troubleshooting Guide (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 2. Check continuity from TDK1 (terminal 1) to J13T.
(a) Repair any loose or damaged wire (para. 2-20).
(b) Replace/repair connector J13 if faulty (para. 2-21).
(c) Replace TDK1 if the checks done in steps 1 and 2 are okay (para. 2-23).
Step 3. Check the air blowdown solenoid valve connector, P28 (REF: Interconnection diagram FO-2, Sheet 14), for
damage or loose pins.
Repair the connector, if necessary (para. 2-7).
Step 4. Check for resistance across pins P28A and P28B of the air blowdown solenoid valve connector.
If the multimeter reads infinity or a short circuit, replace the air blowdown solenoid valve (para. 2-48).
Van lights do not work. (Ref. Schematic diagram FO-1, sheet 10, schematic lines 1026-1030).
Shut down ROWPU and generator. Refer to electrical drawings in Appendix D. Check continuity, point-to-point, from
transformer T1(X1) (REF: Interconnection diagram FO-2, Sheet 10) to J12C (REF: Interconnection diagram FO-2,
Sheet 9). Repeat the procedure from T1(X2) to connector J10B (REF: Interconnection diagram FO-2, Sheet 9). Check
continuity from J13I (REF: Interconnection diagram FO-2, Sheet 9) to J10A. Check continuity from J12G to J13N and
from J12H to J13P.
(a) Repair any loose or damaged wire (para. 2-20).
(b) Replace circuit breakers CB7 or CB10 (REF: Interconnection diagram FO-2, Sheet 8) if open (para.
2-23).
(c) Replace/repair connectors J12, J13 or J10 if they are faulty (para. 2-21 ).
HEAT TRACE.
Heat trace does not work. (Ref. Schematic diagram FO-1, sheet 11, schematic lines 1102-1104).
Shut down ROWPU and generator. Refer to electrical drawings in Appendix D. Check continuity, point-to-point, from
transformer T2(1D) (REF: Interconnection diagram FO-2, Sheet 10) to the panel connector of the non-operating heat
trace. Repeat the procedure from T2(2D) to the panel connector of the non-operating heat trace.
(a) Replace/repair the electrical connector, if faulty (para. 2-21).
(b) Test switch SS6 (REF: Interconnection diagram FO-2, Sheet 12) and replace if faulty (para. 2-22).
(c) Test circuit breaker CB12 (REF: Interconnection diagram FO-2, Sheet 8) and replace if faulty (para.
2-23).
(d) Replace relay K27 (REF: Interconnection diagram FO-2, Sheet 8) if the A2 contacts are open (para.
2-23).
UTILITY CIRCUITS.
Utility receptacle, panel light or control panel receptacle does not work. (Ref. Schematic diagram FO-1, sheet 11, schematic
lines 1117-1126).
Shut down ROWPU and generator. Refer to electrical drawings in Appendix D. Check continuity, point-to-point, from
transformer T2(1C) (REF: Interconnection diagram FO-2, Sheet 10) to the non-working receptacle or panel light
connections. Repeat the procedure from T2(2C) to the non-working receptacle or panel light connections.
(a) Repair any loose or damaged wire (para. 2-20).
(b) Replace/repair any electrical connector which is damaged (para. 2-21 ).
(c) Replace SR9 (REF: Interconnection diagram FO-2, Sheet 13) receptacle if it is not working (para.
2-24).
(d) Replace the panel light receptacle, if faulty (para. 4-29 of -12 manual).
(e) Replace the panel light switch PB10 (REF: Interconnection diagram FO-2, Sheet 12), if faulty (para.
2-22).
(f) Replace relay K27 (REF: Interconnection diagram FO-2, Sheet 8) if it shows open across the A2
contacts (para. 2-23).
2-40
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