2L6/2N6/2N5/2N4
1-4-68
0840 Faults of RTC
displayed)
[Check at power up]
The RTC setting has reverted
to a previous state. The
machine has not been pow-
ered for 5 years (compared to
the settings stored periodically
in the EEPROM).
The RTC setting is older than
00:01 on January 1, 2000.
[Checked periodically (in 5-
minute interval) after powered
up]
The RTC setting has reverted
to a state older than the last
time it was checked.
10 minutes have been passed
since the previous check.
After C840 is detected, the
machine enters in disconnec-
tion mode after the main
power switch has been
switched on and off and indi-
Battery ( main
PWB)
1. Make sure that the back-up batteries on
the main PWB are not short-circuited.
2. Reset Maintenance T by executing
U906 (see page 1-3-224).
3. If the same C call is displayed when
power is switched on and off, replace the
back up battery.
4. If communication error (due to a noise,
etc.) is present with the RTC on the main
circuit PWB, check the PWB is properly
grounded.
Main PWB
Replace the main PWB (see page 1-5-72).
0870 PCFAX control PWB to main
PWB high capacity data
transfer error
High-capacity data transfer
between the FAX control PWB
and the main PWB of the
machine was not normally
performed even if the data
transfer was retried the speci-
fied times.
FAX control PWB 1. Turn the main power swtch off and after
5 seconds, re-mount the FAX controller
PWB, then turn power on.
2. Replace the FAX control PWB.
HDD
Execute U024 to initialize the HDD (see
page 1-3-32).
Main PWB
Replace the main PWB (see page 1-5-72).
0920 Fax file system error
The backup data is not
retained for file system abnor-
mality of flash memory of the
FAX control PWB.
FAX control PWB 1. Execute initializing by U600 (Refer to
the FAX service manual).
2. Replace the FAX control PWB.
0980 24 V power down detect
If a 24V power disconnection
signal is observed and a 12V
power disconnection signal is
observed simultaneously for
one second.
Power source
PWB
1. Check the +24V output is given at YC12-
1 to 3 of the power circuit PWB.
2. Replace the power source PWB (see
page 1-5-85)
Code Contents Related parts
Check procedures/
corrective measures
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