TM 5-3610-253-14
Table 5-23. DIRECT/GENERAL SUPPORT TROUBLESHOOTING - Cont
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
5.
ERROR MESSAGE 84 - Cont
Check for + 42 V at plug connector SCU 1, pin 9.
Step 2.
(a) If present, replace SCU motherboard (paragraph 5-40.34).
(b) If not, proceed to step 3.
Step 3.
Check for 40 V ac at fuse F4.
(a) If 40 V ac is present, replace rectifier PM.V2 and capacitor
PM.C1, (paragraph 5-40.54).
(b) If 40 V ac is not present, and fuse is not defective,
replace main transformer (paragraph 5-40.54).
Step 4.
Check resistance of locking valve coil for open circuit between
connector CU 6, pins 8 and 9.
(a) If 45-52 ohms is not present, replace locking valve
(b) If correct resistance is obtained, proceed to step 5.
5-475
