Ricoh C211 Service Manual page 646

6. Miss Indicator Lights (When the main switch is turned on)
< Phenomenon>
6-2. When the main switch is on, no indicator is displayed on the operation panel.
< Possible causes>
1. VPP (+12V) and VCC (+5V) are not
supplied because of a faulty power
supply PCB. Check if the output of the
power supply is faulty.
The voltage between pin, No. 6 (No. 5:
830) and No. 7 (No. 8: 830) of CN503
should be +5V. The voltage between pin
No. 7 (No. 8: 830) and No. 3 (No. 7: 830)
of CN503 should be +12V.
Power Supply P.C.B.
CN503
<Countermeasure >
1. Replace the power supply PCB. When
the power supply PCB is changed, the
voltage supplied to the thermal head
must be adjusted. Adjust the voltage
between pin No. 1 and No. 4 of CN504 to
the voltage indicated on the thermal head
using VR201 (VR 1: 830).
@3(-j) ,, .==- -
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