Comark RF500A/AP Service Manual
Tier 3: RF500A Component Level Repair
3VC Rail
If the 3VC rail is inoperative of out of specification, common items to check would be:
•
Check supply to U361
•
Check D361 and D362
•
Ensure inter-connecting tracks reach their destination
•
Replace U361
Battery Charging
If the battery charger is inoperative of out of specification, common items to check would be:
•
Check supply to U301
•
Check Q301 (this is used to turn charging on and off, if the gate is pulled hi charging is off)
•
Check correct value is fitted for R301
•
Ensure inter-connecting tracks reach their destination
•
Replace U301
PoE (If Fitted)
If the PoE is inoperative of out of specification, common items to check would be:
•
Check Cable CAB1
•
Check correct components fitted for D321 and D322
•
Check correct value is fitted for R321
•
Ensure inter-connecting tracks reach their destination
•
Replace U321
RTC
If the RTC is inoperative, common items to check would be:
•
Check supply to U423
•
Ensure inter-connecting tracks reach their destination
•
Replace U423
Memory Cards
If the memory cards are inoperative, common items to check would be:
•
Check RN601 and RN602
•
Check both memory card connectors (J601 and J602)
•
Check the supply to both cards (3VM)
•
Ensure inter-connecting tracks reach their destination
•
Replace cards and connectors
17 November 2011
Page 47 of 65
