Service manual

2-1. Potential sensor/ID sensor check

Using a digital oscilloscope, check the waveforms at the following terminals.

If the waveforms are flat, the sensor is broken.

• Potential sensor (V-SEN)

TP213 on the main control board and GND (Ground)

• ID Sensor (P-SEN)

TP217 on the main control board and GND (Ground)

After connecting the digital oscilloscope, reassemble the machine, perform

the forced process control self check (SP3-126), and check the waveforms

while the self check is running.

If the shapes are similar to those shown in the diagram, there is no problem.

(The exact shapes and amplitudes of the peaks depends on the machine’s

condition and environmental circumstances.)

PRIN

ROM

SCSI CN

GND

DIP

P-SEN

TP217

V-SEN

TP213

GND

FUSE

Front

for YMC

Potential

sensor

ID sensor

for Bk

ID sensor

Potential

sensor

HOW TO DETERMINE IF THE POTENTIAL SENSOR OR ID SENSOR IS DEFECTIVE

A166/A187/A189 6-36 SM

CÓPIA NÃO CONTROLADA