Oki OKIFAX 5750 Maintenance Manual page 790

3.1.9 Clock NG
9: Clock NG
Clock display is NG
No
Time error
Battery voltage at 2.5V
or higher
Yes
Input waveform of pins 2,
12 of IC34 is similar to
Figures 3.1-13, 14
Yes
Input waveform of pins 4,
5 of IC5 is similar to
Figures 3.1-13, 14
Yes
Input waveform of pin 11
of IC4 is similar to
Figures 3.1-15, 16
Yes
Input waveform of pins 3,
10 of IC4 is similar to
Figures 3.1-15, 16
Yes
Replace IC4.
41285901TH Rev.3
Yes
All other operation display
are OK
No
See the operation
interface error.
No
Replace the battery.
No
2: RTCCS
12: RTCCK
No
4: RTCWR
5: RTCTXD
No
11: RTCDATA
No
3: CE
10: CLK
Replace IC34.
Yes
Memory check is OK
(memory error does not
displayed on operation
panel)
Yes
Replace IC5. Replace IC2.
No
See the memory error.
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