Gestetner B147, Service Manual

Page: 209 / 1081

SCANNER TEST MODE
SM 4-7 B147/B149/B190
Trouble-
shooting
4.2 SCANNER TEST MODE
4.2.1 VPU TEST MODE
To make sure the scanner VPU control is functioning, output the VPU test pattern
with SP4-907. After you have set the SP mode settings and pressed the start key,
the VPU test pattern is printed out.
SP4-907-1 VPU Test Pattern: R
SP4-907-2 VPU Test Pattern: G
SP4-907-3 VPU Test Pattern: B
• If the copy is abnormal and the VPU test pattern is normal, the CCD on the SBU
board may be defective.
• If the copy is normal and the VPU test pattern is abnormal, the harness may not
connected properly between SBU and IPU, or the IPU or SBU board may be
defective.
4.2.2 IPU TEST MODE
You can check the IPU board with the SP mode menu, SP4-904-1 or 2.
If no error is detected, the test ends, and the completion code appears in the
operation panel display. If an error is detected, the test is interrupted and an error
code is displayed. The table below lists the completion and error codes.
SP4-904-1 Register Write/Read Check Result
Code Defective ASIC
Normal end 00 —
11
12
ASIC 1
13 ASIC 2
14 ASIC 3
Abnormal end
15 Ri 10
SP4-904-2 Image Path Check Result
Code Error detected in the image data path
Normal end 00 —
21
ASIC 1
→
ASIC 2
22
ASIC 1 → ASIC 3 → ASIC 1 → ASIC 2
23
ASIC 2
→
ASIC 1
→
ASIC 3
→
ASIC 1
→
ASIC 2
24
ASIC 3
→
Ri 10
Abnormal end
25
Scanner ASIC → ASIC 1