Oki OKIOFFICE84 Maintenance Manual page 459

3: Read image data NG
Sensor LED is lit
Yes
Input waveform of pin 11
of IC6 is similar to Figure 3-2
or waveform peak between
1.6 V and 3.2 V
Yes
IC6 SDT 2-7 are 0K
(digital converted value)
No
Replace IC6.
40672201TH 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 3-1
or waveform peak between
0.5 V and 2 V
Yes
Replace IC16
Replace IC13.
or RAM1.
Yes
No
Voltage of pin 3 of TR26
comes down approximately
0.7 V than pin 1 when the
sensor is lit
Replace TR26.
No
Yes
Sensor clock waveform
is similar to Figure 3-1?
(Check with pin 8 of CN5.)
Check CN5.
H - 4
No
Yes
Replace TR505.
No
Yes
Yes
Replace IC16.