Adjusting Ink Detection - Ricoh C226 Service Manual

DRUM SECTION

9.11 ADJUSTING INK DETECTION

Purpose: To ensure that the ink detection PCB detects a no ink condition
when the ink is running out.
Adjustment Standard:
See the Above illustration.
1. Remove the rear cover of the machine.
2. Connect the CH1 probe of an oscilloscope to TP1, the CH2 probe to TP2
and the GND lead to TP-12 V. Select the 5 microsecond range.
3. Turn the main switch on and install a drum with no ink or remove the ink
bottle and continue to make prints until the Add Ink indicator lights.
4. Ensure that the waveform is as shown.
NOTE: 1. This adjustment should be made under normal conditions
(20°C/65 % RH).
2. The period of the waveform varies inversely with temperature.
(High temp. → reduced period, Low temp. → increased
period )
5. If not, adjust the ON timing of the detection signal using VR901 on the ink
detection PCB.
SM 5-57 C226