2C9
1-7-2
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.
• High-voltage PCB: VR201, VR202, VR301
• Drum unit zener PCB: VR1
1-7-3 Remarks on engine PCB or main PCB replacement
When replacing the engine PCB or main PCB, remove the EEPROM from the engine PCB or main PCB that has been
removed and then reattach it to the new engine PCB or main PCB.
EEPROM
EEPROM
Figure 1-7-2
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