Service manual

3. DIAGNOSTIC CHECK
3.10 Service Manual BSM-4100
CPU Check Menu Items
The CPU check menu items check the function of the CPU peripherals such as
ROMs, RAMs, Switches, Touch Key, Sound generators, Alarm indicators and
external memory modules.
ROM Check
This item checks the ROMs on the MAIN board by the CRC (cyclic redundancy
check) technique. This check assigns a count number when one set of checks is
successfully completed. A set of checks takes about 1 minute and 30 seconds.
If an error message appears, the MAIN board will be faulty.
Procedure to Start and Exit the ROM Check Program
1. To select the ROM Check, touch the “ROM CHECK” key. The instrument
automatically starts the ROM check.
2. The instrument repeats the check and increments the pass count until you
touch the “RETURN” key.
3. If the check program finds an error, it displays the type of ROM (PROGRAM or
IMAGE) in the above area.
4. To return to the MANUAL CHECK MENU screen at any time, touch the
“RETURN” key.