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3. DIAGNOSTIC CHECK
Service Manual BSM-4100 3.3
The MAIN board and DPU board are checked as follows:
• CPU ROM CHECK: Checks the system ROM for the host CPU on the MAIN
board. The MAIN board will be faulty if an error which causes a partial screen
problem is found.
• CPU RAM CHECK: Checks the system RAM for the host CPU and patient data
storage. The MAIN board will be faulty if an error which causes a screen
problem is found.
• DPU ROM CHECK: Checks the system ROM for the CPU on the DPU board.
The DPU board will be faulty if an error which causes a screen problem or data/
waveform display problem is found.
• DPU RAM CHECK: Checks the system RAM for the CPU on the DPU board.
The DPU board will be faulty if an error which causes a screen problem or data/
waveform display problem is found.
• 2PORT RAM CHECK: Checks the common memory (Dual port RAM on the
DPU board) for the communication between the MAIN and DPU boards. The
DPU board will be faulty if an error which causes a screen problem or data/
waveform display problem is found.
• CLOCK IC CHECK: Checks the real-time clock IC on the MAIN board. If the
date or time is wrong, the clock IC is initialized. The MAIN board will be faulty
if an error is found.
• A/D CHECK: Checks the system counter. The MAIN board will be faulty if an
error which disables the data processing function is found.
• E2PROM CHECK: Checks the backup memory for the system setup data storage.
If the data is wrong, the memory is initialized. The MAIN board will be faulty if
an error is found.
If a serious error is found in the abovementioned checks, the instrument displays
the DIAGNOSTIC CHECK screen without displaying the patient monitoring
screen.
The following data checks are also done. The data is corrected if necessary.
• BACK UP CHECK: Checks the backed up data. If the backed up data has
something wrong, the data is initialized.
• TIME CHECK: Checks correctness of the time.
• GET TIME CHECK: Checks the period during the AC power off in the battery
operation and adjusts the time data if it is wrong.