Canon FAX-B820 Service Manual page 44

3.4.5 DRAM test
In the test mode menu, press numeric button '1' and select the DRAM test mode. DRAM test 1
writes and reads data into and from all areas of the DRAM and checks that the operation is normal.
DRAM test 2 performs data read only, at high speed.
In the event of an error, replace the SCNT board.
Testing
DRAM TEST 0C30000
Normal completion
DRAM COMPLTE
W: Write data
:
R: Read data
ADR ADR: Address
0C30000: sector being checked
Error
Error display
W= 33CC
ADR= 2800
Error display
DRAM
Figure 1-12 DRAM test
1-39
R= 3333
Press the START/ COPY
button to restart
(error)