Gestetner G060, Service Manual

Page: 490 / 1106

SCANNER TEST MODE
G570 4-8 SM
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 —
Abnormal end 11
12
13 ASIC 1
14 ASIC 3
15 ASIC 2
SP4-904-2 Image Path Check Result
Code Error detected in the image data path
Normal end 00 —
Abnormal end
21
ASIC 1
→
Field memory
22
ASIC 1
→
ASIC 2
→
ASIC 1
→
Field memory
23
ASIC 1
→
ASIC 3
24
ASIC 3
→
ASIC 1
→
ASIC 2
→
ASIC 1
→
Field memory
Errors may be caused by the following problems:
1) Short circuit on the signal lines
•
When the IPU board is installed, one or more pins on the ASIC is
damaged.
•
Some conductive matter or object is trapped among the pins.
•
Condensation
2) Destruction of circuit elements
•
Overcurrent or a defective element has broken the circuit.
3) Abnormal power supply
•
The required voltage is not supplied to the devices.
4) Overheat/overcooling
•
The board (the scanner unit) is in an inappropriate environment.
5) Static electricity
•
Static electricity of a high voltage occurred during the test.
6) Others
•
Error code 13 may be detected if the write/read check is performed after
the image path check. Turn the main switch off and on after the image
path check.
•
For codes 21 to 24
The connector between the scanner unit and the IPU board is not
connected, or the LSYNC signals are not input to the IPU board.