Canon ImageCLASS MF4690 Service Manual - page 168
Chapter 14
14-28
error appearing on the touch panel (LCD).
Numeric keypad key 2
Checks to see if data can be correctly read from all areas of D-RAM (SDRAM). If an error occurs making this check, the test is aborted, with an error appearing
on the touch panel (LCD).
F-14-7
14.13.3 Scan Test
14.13.3.1 Scan Test ((2) SCAN TEST)
0016-2129
Scan test ((2) SCAN TEST)
Press the numeric keypad key 2 on the test mode menu to select the SCAN test.
Press numeric keypad keys 1 during the SCAN test to carry out the individual tests described below.
Numeric keypad key 1
Corrects the LED output of the contact sensor and sets its parameters automatically. (AGC adjustment)
14.13.4 Print Test
14.13.4.1 Print Test ((3) PRINT TEST)
0016-2130
Print test ((3) PRINT TEST)
Press the numeric keypad key 3 on the test mode menu to select the print test.
Press numeric keypad keys 2 and 4 during the print test to generate test patterns as described below. Two kinds of service test patterns are available. Other test
patterns are reserved for factory/development purposes.
Numeric keypad key 2
(2) BLACK: All-black output
Numeric keypad key 4
(4) ENDURANCE: Black belt output
To cancel test printing, press the stop key.
F-14-8
14.13.5 Modem Test
14.13.5.1 MODEM Test ((4) MODEM TEST)
0016-2131
MODEM test((4) MODEM TEST)
These tests test modem and NCU transmission and reception. The modem tests check whether signals are sent correctly from the modem by comparing the sound
D-RAM
TEST
29696KB
D-RAM
TEST
29696KB
D-RAM
TEST
29696KB
complete
(error)
29696
29696
D-RAM
TEST
29696KB
[1] - [2]
D-RAM
TEST
29696KB
complete
(no error)
WRT= 33CC RD= 33EC
ADR= BF840201
Use it to make sure that the print
pattern does not have white lines
or uneven image.
Use it to make sure that the print
pattern does not have contraction/
elongation of an image or dirt/black
line.s