Positions For Measuring And Adjusting On Pw1 Board; Preparation; Ic501 Oscillation Frequency Adjustment; A) Voltage Adjustment - Epson PhotoPC 850Z Service Manual

EPSON PhotoPC 850Z
5.2.2 Positions for Measuring and Adjusting on
PW1 Board
It is not necessary to perform this adjustment when replacing the entire PW1
Board. However, the adjustment is required if individual parts of the PW1
Board are replaced.
CL535
VR503
CL554
CL520
VR501
CL563
Figure 5-4. Positions for Measuring and Adjustment


It is necessary to adjust the voltage when the adjustment
value is out of rule.


Voltage adjustment can be carried out in VIEW mode and
backlight ON.
Adjustment
VR502
CL530
VR504
CL534
VR505
pw1

5.2.2.1 Preparation

1. Remove the shield case of Side A on the PW1 Board.
2. If adjustment is performed without barrier switch, short Pins 1, 2 and 3 of
CN322 on the SY2 Board.

5.2.2.2 IC501 Oscillation Frequency Adjustment


Measuring Point:

Measuring Equipment:

ADJ. Location:

ADJ. Value:

Adjusting Method:
5.2.2.3 5.1V (A) Voltage Adjustment

Measuring Point:

Measuring Equipment:

ADJ. Location:

ADJ. Value:

Adjusting Method:
5.2.2.4 3.25V (D) Voltage Adjustment

Measuring Point:

Measuring Equipment:

ADJ. Location:

ADJ. Value:

Adjusting Method:
Adjustment
Revision A
CL520
Frequency Counter
VR501
200 ± 0.50 kHz
Adjust with VR501 to 200 ± 0.50 kHz.
CL530
Digital Voltmeter
VR502
5.10V ± 0.05V
Adjust with VR502 to 5.10 ± 0.05V.
CL535
Digital Voltmeter
VR503
3.25 ± 0.05V
Adjust with VR503 to 3.25 ± 0.05V.
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