Sharp FO-2970M Service Manual - Page 5

Adjustments

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CHAPTER 2. ADJUSTMENTS [1] Adjustments General Since the following adjustments and settings are provided for this model, make adjustments and/or setup as necessary. 1. Adjustments Adjustments of output voltage (FACTORY ONLY) 1. Install the power supply unit in the machine. 2. Set the recording paper and document. 3. When the document is loaded, power is supplied to the output lines. Confirm that outputs are within the limits below. Output voltage settings Power Supply PWB 1 CN101 12 Printer PWB 1 CNPW 12 Fig. 1 2. High voltage power adjustments The high voltage power adjustments are composed of the MC output voltage adjustment and the DC bias output voltage adjustment. Either adjustment is performed with the diag function. (MAIN CHG ADJUST MODE) 1 MC output voltage adjustment In the measurement circuit shown below, adjust VR1 to be -1050V ~ -1200V (aim at -1100V) Measure with the high voltage tester (effective value meter). MC DRUM + MC output voltage check - • Capacitor: 1000pF/3KV (VCKYQY3FB102K) • Diode: SHV-03 (VHDSHV03///-1) FO-2970MU Output +5V +24VH +24V* Voltage limits 4.75V~5.25V 23.04V~24.96V 23.04V~24.96V Connector PIN No. No. CNPW 1 +5V 2 DG 3 DG 4 +24VH 5 MG 6 MG 7 +24VS 8 PWRLY- 9 HLON- 10 +24V 11 +24V 12 ZC VR1 (MC output voltage adjustment volume) 2 - 1 Fig. 3 Fig.2

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FO-2970MU
2 – 1
CHAPTER 2. ADJUSTMENTS
[1] Adjustments
General
Since the following adjustments and settings are provided for this model,
make adjustments and/or setup as necessary.
1. Adjustments
Adjustments of output voltage (FACTORY ONLY)
1.
Install the power supply unit in the machine.
2.
Set the recording paper and document.
3.
When the document is loaded, power is supplied to the output lines.
Confirm that outputs are within the limits below.
Output voltage settings
Fig. 1
Fig. 3
Printer PWB
1
CNPW
CN101
12
1
12
Power
Supply
PWB
2. High voltage power adjustments
The high voltage power adjustments are composed of the MC output
voltage adjustment and the DC bias output voltage adjustment. Either
adjustment is performed with the diag function. (MAIN CHG ADJUST
MODE)
MC output voltage adjustment
In the measurement circuit shown below, adjust VR1 to be –1050V ~
–1200V (aim at –1100V)
MC
Measure with the high
voltage tester
(effective value meter).
DRUM
• Capacitor: 1000pF/3KV (VCKYQY3FB102K)
• Diode:
SHV-03 (VHDSHV03///-1)
Fig.2
VR1 (MC output voltage adjustment volume)
+
–
MC output
voltage check
Output
Voltage limits
+5V
4.75V~5.25V
+24VH
23.04V~24.96V
+24V*
23.04V~24.96V
PIN No.
Connector
No.
CNPW
1
+5V
2
DG
3
DG
4
+24VH
5
MG
6
MG
7
+24VS
8
PWRLY–
9
HLON–
10
+24V
11
+24V
12
ZC