G4 Mode Pc Loading Ng - Oki OKIFAX4550 Maintenance Manual

4.4.13 G4 mode PC loading NG

13: G4 mode PC
loading NG
Check CN1, RAM3, RAM1,
FLS, IC1 solderling.
Good
Check appearance of
G4N board.
Good
Waveform of pins 51, 50,
27 of RAM3 are similar
to Figure H.10(1/3).
Yes
Waveform of pins 1, 6, 7,
17 of RAM3 are similar
to Figure H.10(2/3).
Yes
Waveform of pins 51, 46,
45, 27 of RAM3 are similar
to Figure H.10(3/3).
Yes
Waveform of pins 14, 31,
13, 2 of RAM1 are similar
to Figure H.12.
Yes
Waveform of pins 12, 14,
43, 15 of FLS are similar
to Figure H.9.
Replace CPU chip.
Yes
Replace G4N board.
41309401TH Rev.4
Error at G4 mode PC loading.
Bad
Re-solderling
Bad
Modify bad point
No
Check CN1 solderling
No
Replace RAM3
No
Replace RAM3
No
Replace RAM1
No
Replace FLS and
re-loading G4N program
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