Sharp MXM700N
Adjustment. 1-B Adjust the developing bias voltage
NOTE:
Adjusting the output voltage requires the ability to measure internal impedance of 1000Ω. In addition, use high voltage probe together. (FLUKE87FLUKE80K-40 is recommended.)
This adjustment is needed in the following situations:
- The high voltage power PWB (MC/DV/TC) has been replaced.
- U2 trouble has occurred.
- The PCU PWB has been replaced.
- The EEPROM of the PCU PWB has been replaced.
Simulation 8-1
High voltage power PWB (MC/DV/TC)
| Simulation | Setting range | Default | Connector | Pin # | Actual voltage |
|---|---|---|---|---|---|
| AUTO | 0 – 750 | 495 | CN2 | 7 | – 500 ± 5V |
| CHARACTER | 0 – 750 | 495 | CN2 | 7 | – 500 ± 5V |
| MIX | 0 – 750 | 495 | CN2 | 7 | – 500 ± 5V |
| PHOTO | 0 – 750 | 495 | CN2 | 7 | – 500 ± 5V |
| PRINTER | 0 – 750 | 495 | CN2 | 7 | – 500 ± 5V |
| FAX | 0 – 750 | 495 | CN2 | 7 | – 500 ± 5V |
| PLUS | 0 – 250 | 150 | CN2 | 7 | + 500 ± 5V |
- Remove the rear cover of the machine.
- Apply a digital multi-meter to the connector CN2 pin (7) of the high voltage PWB and the chassis GND.
- Go through the modes specified in Simulation 8-1.
- Select the number that corresponds to the adjustment item using the numeric keypad.
- Press the Start key.
- Press the start key to have the voltage output for 30 seconds. The operation can be stopped with the SYSTEM SETTINGS key. If the output voltage is not within the requirement, do the following steps.
- Enter the adjustment value using the numeric keypad.
- Press the Start key. (The adjustment value is put into memory, and the corresponding voltage is output for 30 seconds.)
Repeat steps 7 to 8 until the output requirement is satisfied.