Errors Not Shown On Display - Canon FAX-B820 Service Manual

[MEMORY FULL] (#037)
Cause: A very large document has been received in memory reception and the memory is full.
Countermeasure: (1) Print out the document(s) stored in the memory and try the operation again.
(2) Delete any unnecessary documents from the memory.
Cause: There are too many pages in the transmission document and the transmission memory is full.
Countermeasure: Split up the document and send it.
2.2.2 Error codes
a) Service error code output
When service data #1 SSSW SW01 bit 0 is set to '1', if a transmission ends in error,
a service error code will be output on the transmission activity report, reception results report and
the error transmission report. Also, in the event of an error, the error code will be shown on
the display.
b) Error codes
Refer to 'G3/G4 Facsimile Error Codes Service Handbook' for details on error code causes
and countermeasures.

2.3 Errors not shown on display

2.3.1 General errors
·No power
(1) Check that the power cord is properly connected.
(2) Check the connection between the SCNT board (J151) and the power supply unit.
(3) Check the power supply unit fuse (F1).
(4) Replace the power supply unit.
(5) Replace the SCNT board.
·Abnormal display
Nothing displayed
(1) Check the connection between the control panel unit and the SCNT board (J202).
(2) Replace the control panel unit.
(3) Replace the SCNT board.
Part of the LCD does not display
(1) Check the connection between the control panel unit and the SCNT board (J202).
(2) Replace the control panel unit.
(3) Replace the SCNT board
· Operation panel buttons do not work
(1) If test mode can be used, check which buttons do not work.
(2) Check the connection between the control panel unit and the SCNT board (J202).
(3) Replace the control panel unit.
(4) Replace the SCNT board.
1-5