TM 55-1520-240-T 4-7.3 ENGINE ACCESSORY GEARBOX CHIP DETECTORS 4-7.3 OPERATIONAL CHECK (Continued) TASK RESULT 1. Check that HYDRAULICS MAINT PNL If circuit breaker (1) is open, close it.  If it opens circuit breaker (1) is closed. again, go to task 8-14.3. 2. Check master caution panel (2). If NO. 1 or NO. 2 ENG CHIP DET capsule (3 or 4) is lit, go to task 4-7.4. 3. Check NO. 1 and NO. 2 ENGINE CHIP Both indicators shall be all-black.  If either in- DETECTOR indicators (5 and 6). dicator displays black-and-white fan, go to task 4-7.5. 4. Set and hold GND switch (7)  to TEST.   NO. 1 and NO. 2 ENG CHIP DET capsules (3 and 4) shall come on.  NO. 1 and NO. 2 ENGINE CHIP DETECTOR indicators (5 and 6) shall change to black-and-white fan.  If NO. 1 ENG CHIP DET capsule is out, go to task 4-7.6.  If NO. 2 ENG CHIP DET capsule is out, go to task 4-7.7.  If NO. 1 or NO. 2 ENGINE CHIP DETECTOR indicator is all-black, go to task 4-7.8. 5. Set GND switch (7) to RESET, then to NO. 1 and NO. 2 ENGINE CHIP DETECTOR in- GND. dicators (5 and 6) shall change to all-black.  If both indicator displays are not black, go to task 4-7.5. CHECK NO. 1 ENGINE ACCESSORY GEARBOX CHIP DETECTOR 6. Short terminal stud of NO. 1 engine chip NO. 1 ENG CHIP DET capsule (3) shall come on detector (8) to its mounting base with a and NO. 1 ENGINE CHIP DETECTOR indicator jumper wire. (5) shall change to black-and-white fan.  If capsule does not come on and indicator display does not change, go to task 4-7.9. 7. Remove jumper.   NO. 1 ENG CHIP DET capsule (3) shall go out.  If it stays on, go to task 4-7.4. 8. Set GND switch (7) to RESET, then to NO. 1 ENGINE CHIP DETECTOR indicator (5) GND. display shall change to all-black.  If it does not, go to task 4-7.5. CHECK NO. 2 ENGINE ACCESSORY GEARBOX CHIP DETECTOR 9. Short terminal stud of No. 2 engine chip NO. 2 ENG CHIP DET capsule (4) shall come on detector (8) to its mounting base with a and NO. 2 ENGINE CHIP DETECTOR indicator jumper wire. (6) shall change to black-and-white fan.  If capsule does not come and indicator display does not change, go to task 4-7.9. 10.   Remove jumper.   NO. 2 ENG CHIP DET capsule (4) shall go out.  If it stays on, go to task 4-7.4. TASK RESULT 11.   Set GND switch (7) to RESET then to NO. 2 ENGINE CHIP DETECTOR indicator (6) GND. display shall change to all-black.  If it does not, go to task 4-7.5. FOLLOW-ON MAINTENANCE: TM 55-1520-240-23: Remove electrical power. Disconnect battery. Close No. 1 or No. 2 engine work platform and access door. END OF TASK 4-181