High Voltage Adjustment; Main Charger (Grid Bias); Dv Bias Adjustment - Olivetti d-Copia 12 Service Manual

5.4 High voltage adjustment

5.4.1 Main charger (Grid bias)

• Use a digital multi meter with internal resistance of
10MW or more measurement.
• After adjusting the grid LOW output, adjust the HIGH
output.
Do not reverse the sequence.
5.4.1.1 Procedures
1. Set the digital multi meter range to DC700V.
2. Set the positive side of the test rod to the connector
CN11-3 (GRID) of high voltage section of the power PWB
and set the negative side to the frame ground (radiating
plate).
3. Execute SIM 8-3. (The main charger output is supplied for
30 sec in the grid voltage LOW output mode.)
4. Adjust the control volume (VR-141) so that the output
voltage is – 400 ±20V.
5. Execute SIM 8-2. (The main charger output is supplied for
30 sec in the grid voltage HIGH output mode.)
6. Adjust the control volume (VR-142) so that the output
voltage is 580 ±10V.
5-10

5.4.2 DV bias adjustment

• A digital multi meter with internal resistance of 1GW
must be used for correct adjustment.
5.4.2.1 Procedures
1. Set the digital multi meter range to DC500V.
2. Set the positive side of the test rod to the connector
CN-10-1 (DV BIAS) and set the negative side to the
connector CN10-2 (FG).
3. Execute SIM 8-1. (The developing bias is outputted for
30 sec.)
4. Adjust the control volume (VR-121) so that the output
voltage is – 400 ±5V.
Service Manual Y101700-5