Scanner Test Mode; Vpu Test Mode; Sp4-907-1 Vpu Test Pattern: R; Sp4-907-2 Vpu Test Pattern: G - Gestetner B147 Service Manual

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
Normal end 00
Abnormal end 11
12
13
14
15

SP4-904-2 Image Path Check Result

Code
Normal end 00
Abnormal end 21
22
23
24
25
SM
Defective ASIC
—
ASIC 1
ASIC 2
ASIC 3
Ri 10
Error detected in the image data path
—
ASIC 1 → ASIC 2
ASIC 1 → ASIC 3 → ASIC 1 → ASIC 2
ASIC 2 → ASIC 1 → ASIC 3 → ASIC 1 → ASIC 2
ASIC 3 → Ri 10
Scanner ASIC → ASIC 1
4-7
SCANNER TEST MODE
B147/B149/B190