G4N Board; Isdn Board Ng - Oki OKIFAX4550 Maintenance Manual

4.4

G4N Board

4.4.1 ISDN Board NG (01)

1: ISDN Board NG (01)
Check BOOT2 signal level
at CN10-A11 pin of 46F/R46
board without G4N board.
Low
Check CPU-97 pin
solderling.
Good
Check CN1-30 pin
solderling.
Good
Check appearance of

G4N board.

Good
Replace CPU chip.
Bad
Replace G4N board.
41309401TH Rev.4
The signal BOOT2 from 46F/R46 board to G4N
board is High level at power on.
High
Check 46F/R46 board
Bad
Re-solderling
Bad
Re-solderling
Bad
Modify bad point
Good
Cause is CPU chip failure
561 /