Ccd Check; Memory/Hdd Adj - Konica Minolta bizhub C250 Service Manual

Field Service Ver. 3.0 Aug. 2006
10.12.6

CCD Check

Functions • To display the D/A value of CCD clamp/gain for R, G, and B.
Use • Used for troubleshooting for the CCD Sensor.
Setting/ • Use the following guidelines on the correct range of values.
Procedure CLAMP: The difference between the max. and min. output values should be
GAIN : The difference from the CLAMP values (R, B) should be within (90 for R
10.12.7

Memory/HDD Adj.

A. Memory Check
Functions • To check correspondence of data written to and that read from memory through
write/read check.
Rough Check
• A check is made to see if the image data reading and writing are correctly made in a
very limited area.
• The progress of the check sequence is displayed in percentage.
Detail Check
• A check is made to see if the image data reading and writing are correctly made at
the addresses and buses in all areas.
• The progress of the check sequence is displayed in percentage.
Use • If the copy image is faulty.
Adjustment 1. Call the Service Mode to the screen.
2. Touch these keys in this order: [State Confirmation] → [Memory / HDD Adj.] →
Procedure
[Memory Check].
3. Select the desired type of check, either Rough Check or Detail Check.
4. Press the Start key to start the check procedure.
5. When the check procedure is completed, the results are shown on the screen.
If the check results are NG, check the memory for connection or replace the memory
with a new one.
✽ Press the Stop key to interrupt the check sequence.
B. Compress / Decompression Check
Functions • To check whether compression and decompression are carried out properly.
Use • If the copy image is faulty.
Adjustment 1. Call the Service Mode to the screen.
2. Touch these keys in this order: [State Confirmation] → [Memory / HDD Adj.] →
Procedure
[Compress / Decompression Check].
3. Pressing the Start key will automatically start to complete a compression/decom-
pression check sequence.
4. The check result will be displayed,
within ±100.
and B. The difference from the CLAMP value (G) should be within ±50
for G. The difference between each pair of RO and RE, GO and GE, and
BO and BE should be within 30.
10. Service Mode
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