Plug & Play Failure; Ddc 1 Failure; Ddc 2B Failure - NEC MultiSync FP1370 Service Manual

15. PLUG & PLAY FAILURE

15-1. DDC 1 failure

Retry Check the DDC Function alter Power OFF/ON.
OK
OK
NG
Check the Write Protect function
NG
Check the vertical frequency
others
OK CPU (IC801) failure
Check the V Sync
OK
IC8A1 may have failed
NG
Q8A1, Q8A2, Q8A3 may have failed

15-2. DDC 2B failure

Check the DDC 1
NG
Check the DDC 1 failure
OK
Mini D-sub 12, 15 pin, Signal cable, ZD8A1, ZD8A2 may have failed.
Check the voltage of IC8A1 pin 3. It should be approx. 0 (V)
41±1Hz
Your PC system may have failed
Check the IC8A1 pin 7
7-34