Minolta CF910 Service Manual page 417

2. C3310 (CCD gain adjustment failure)
• CCD Sensor Board PWB-A
• A/D Converter Board PWB-B
• IR Control Board PWB-C
<Troubleshooting Procedure>
Step
1 Is any of the CF910 gain adjustment val-
ues of CCD Check "0" or "255"?
2 Is any of the CF910 gain adjustment val-
ues of CCD Check "110" or more?
3 Are the CF910 gain adjustment values of
CCD Check as follows?
R: Less than 18, or 158 or more
G, B: Less than 5, or 145 or more
4 Is the voltage across PJ4B1 and 2 on
PWB-B +12V and that across 2 and 3 -
12V?
5 Is 12V being output from PJ98 of PU1?
Possible Defective Components
Check Item
T-51
• Exposure Lamp LA1
• Lamp Regulator PU4
Result
YES A. Check for loose connector
between PWB-A and PWB-
B, or between PWB-B and
PWB-C, or check har-
nesses for open circuit.
B. Change PWB-C.
YES A. After cleaning the optical
system, turn OFF and ON
the Power Switch or open
and close the Front Door.
B. Check the Lamp Reflector
for distortion.
YES A. After cleaning the optical
system, turn OFF and ON
the Power Switch or open
and close the Front Door.
B. Check the Lamp Reflector
for distortion.
YES A. Check for loose connector
between PWB-A and PWB-
B, or check harnesses for
open-circuit.
B. Change PWB-B.
YES Check for loose connector
between PU1 and PWB-B, or
check the DC12V harnesses for
open circuit.
NO Change PU1.
Action