Oki OKIFAX 5750 Maintenance Manual page 776

3.1 Main control board M76 (R76)
3.1.1 Memory error
1: Memory error
Error displayed on LCD
No
(See Note 1.)
Waveform of pin 14
(RAS3) of RAM1 is similar
to Figures 3.1-3, 4
Yes
Waveform of pins 37, 38
(CAS3) of RAM1 are
similar to Figures 3.1-3, 4
Yes
Waveform of pin 36 (OE)
of RAM1 is similar to
Figure 3.1-3
Yes
Waveform of pin 13 (WE)
of RAM1 is similar to
Figure 3.1-4
Yes
Replace RAM1
41285901TH Rev.3
Note 1: When RAM-NG appears on the test print
Yes
Waveform of pins 11, 26,
28 of FLS1 are similar to
Figures 3.1-1, 2
Waveforms of pins 11, 26 ,
28 of FLS2 are similar to
Figures 3.1-1, 2
No
No
No
No
Replace IC2
11 : WR
26 : CE
28 : OE
Yes
No
Yes
Replace FLS2
Replace FLS1
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