Service manual

3. DIAGNOSTIC CHECK
Service Manual BSM-4100 3.41
DPU RAM Check
This item checks the RAM on the DPU board by comparing the test patterns (first
written to the RAM) with the test patterns (later read from the RAM).
If an error message appears, the DPU board will be faulty.
Procedure to Start, Stop, and Exit the DPU RAM Check Program
1. To select the DPU RAM Check, touch the “RAM CHECK” key at the DPU
CHECK column. The check program automatically starts.
The “START” key is highlighted to indicate the process of checking.
2. If the check program finds an error, it displays the address, write data and read
data as above table.
3. To stop the check temporarily, touch the “STOP” key. The highlighted
“START” key changes to normal and the “STOP” key is highlighted.
To continue the check, touch the “START” key again.
4. To return to the MANUAL CHECK MENU screen, touch the “RETURN” key.