Read Image Data Ng - Oki OKIFAX4550 Maintenance Manual

4.1.3 Read image data NG

3: Read image data NG
Sensor LED is lit
Yes
Input waveform of pin 12
of IC6 is similar to Figure
H.3(2/2) or waveform peak
between 1.6 V and 3.2 V
Yes
IC6 SDT 2-7 are 0K
(digital converted value)
No
Replace IC6.
41309401TH Rev.4
No
5V input to pin 2 of TR505
when the sensor is lit
Replace IC16.
No
Input waveform of pin 3
of IC13 is similar to Figure
H.3(1/2) or waveform peak
between 0.5 V and 2 V
Yes
Replace IC16
Replace IC13.
or RAM1.
Yes
No
Voltage of pin 3 of TR1
comes down approximately
0.7 V than pin 1 when the
sensor is lit
Replace TR1.
No
Yes
Sensor clock waveform
is similar to Figure H.3(1/2)
(Check with pin 8 of CN5.)
Yes
Yes
Check CN5.
No
Yes
Replace TR505.
No
Replace IC16.
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