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1-7-2
Adjustment-free variable resistors (VR)
The variable resistors listed below are set at the factory prior to shipping and cannot be adjusted in the field.
• Inverter PWB: VR1
1-7-3
Remarks on main PWB replacement
Follow the procedure below to replace the main PWB.
Caution
When replacing the main PWB, run maintenance items U026 and U027. If replacing the PWB without running these items,
faulty images may occur.
Procedure
1. Run maintenance item U000 to output a sta-
tus report (see page 1-4-7).
2. Run maintenance item U026 (Evacuation of
the backup data), and record the displayed
checksum (see page 1-4-11-1).
3. Replace the main PWB.
* When refitting the main PWB, remove the
EEPROM from the main PWB that has been
removed and then reattach it to the new
main PWB.
4. Run maintenance item U027 (Return of the
backup data) (see page 1-4-11-1). Check
that the displayed checksum is the same as
the result of U026 that has been run in step
2.
5. Run maintenance item U000 to output the
status report and check that the current set-
ting is the same as the setting before
replacement of the main PWB (see page 1-
4-7).
1-7-2
Service Manual
Main PWB
Socket
EEPROM
Figure 1-7-3
Y104350-7
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