Oki OKIFAX 5750 Maintenance Manual page 856

3.9.11 G3 mode PC loading NG
11: G3 mode PC
Check CN1, RAM3, RAM1,
FLS, IC1 solderling.
Check appearance of
Waveform of pins 51, 50,
27 of RAM3 are similar
to Figure 3.9-2.
Waveform of pins 1, 6, 7,
17 of RAM3 are similar
to Figure 3.9-3.
Waveform of pins 51, 46,
45, 27 of RAM3 are similar
to Figure 3.9-4.
Check DRAMOE1_N
signal level at RAM1-29 pin.
Waveform of pins 14, 31,
13, 2 of RAM1 are similar
to Figure 3.9-5.
Waveform of pins 12, 14,
43, 15 of FLS are similar
to Figure 3.9-1.
Replace CPU chip.
Replace G3A board.
41285901TH Rev.3
loading NG
Error at G3 mode PC loading.
Bad
Good
Bad
G3A board.
Good
No
Yes
No
Yes
No
Yes
High
Low
No
Yes
No
Yes
Re-solderling
Modify bad point
Replace IC1
Replace RAM3
Replace RAM3
Replace IC1
Replace RAM1
Replace FLS and
re-loading G3A program
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