Ricoh G148, Service Manual

Page: 255 / 537

Vsg less than 4.0V when the maximum
PWM input (255) is applied to the ID sen-
sor.
Vsg greater than or equal to 4.0V when
the minimum PWM input (0) is applied to
the ID sensor.
• ID sensor connector defective
• IOB defective
• ID sensor pattern not written correctly
• Incorrect image density
• Charge power pack defective
• ID sensor dirty
354 C
ID sensor error 5
Vsg falls out of the adjustment target (4.0
±0.2V) during Vsg checking.
• ID sensor defective
• ID sensor harness disconnected
• ID sensor connector defective
• IOB defective
• ID sensor pattern not written correctly
• Incorrect image density
• Charge power pack defective
• ID sensor dirty
355 C
ID sensor error 6
The Vp value, which measures the reflec-
tivity of the ID sensor pattern, was not in
the range of -70V to -400V.
• Potential sensor defective
• Potential sensor harness defective
• Potential sensor disconnected
• IOB defective
• OPC unit connector defective
• Charge corona power pack defective
• Charge corona wire dirty, broken
SC400: Image Development (2)
401 D
Transfer output abnormal
When the transfer is output, the feed-
back voltage remains higher than 4V
for 60 ms.
• Transfer power pack defective
• Transfer current terminal, transfer power
pack disconnected, damaged connector
4. Troubleshooting
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