Clock Ng - Oki OKIFAX4550 Maintenance Manual

4.1.9 Clock NG

9: Clock NG
Clock display is NG
No
Time error
Battery voltage at 2.5V
or higher
Yes
X2 oscillation frequency
is normal (32.768 kHz)
Yes
Input waveform of
pin 2 of IC4 is similar to
Figures H.6(1/2, 2/2)
Yes
Input waveform of
pin 2 of IC3 is similar to
Figures H.6(1/2, 2/2)
Yes
Input waveforms of pins
8 and 10 of IC3 are similar
to Figures H.6(1/2, 2/2)
Yes
Replace IC3.
41309401TH Rev.4
Yes
All other operation display
are OK
No
See the operation
interface error.
No
Replace the battery.
No
Replace X2.
No
No
Replace IC4.
No
IC3 : Pin 2 (CS)
: Pin 8 (RD)
: Pin 10 (WR)
Yes
Memory check is OK
No
(memory error does not
displayed on operation panel)
See the memory error.
Replace IC2.
Yes
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