Isdn Board Ng - Oki OKIFAX4550 Maintenance Manual

4.4.4 ISDN Board NG (04)

4: ISDN Board NG (04)
Check IC2 solderling.
Good
Check appearance of
G4N board.
Good
Waveform of pins 75, 76,
79 of IC2 and pin 53 of
CPU are similar to Figures
H.11(1/3, 2/3).
Yes
Waveform of pins 75, 79,
91 of IC2 are similar to
Figure H.11(3/3).
Yes
Replace G4N board.
41309401TH Rev.4
Initializing IC2 (ISDN LSI) couldn't be
completed.
Bad
Re-solderling
Bad
Modify bad point
No
Replace IC1
No
Replace IC2
564 /