7-4
7. TROUBLESHOOTING
7.2 SYMPTOM: UNIT DOES NOT RESPOND TO POWER UP
CHECK DIAGNOSTIC / ACTION
1. Check if the power switch is on. 1. NO: Push the switch on.
2. Check the voltage applied to the supply
terminals L1 and L2. Is there loss of line
power?
2. YES: Check wiring.
3. Check if the fuse is OK. 3. NO: Change the fuse
4. Is the fluorescent light working? 4. NO: Replace the power supply.
5. Is the problem still present with a new power
supply or with lightning fluorescent tube.
5. YES: Replace the CPU board.
7.3 SYMPTOM: NO DISPLAY BUT THE PRINTING WORKS PROPERLY
CHECK DIAGNOSTIC / ACTION
1. Check if the flat cable connection between
MMI and CPU board is correct.
1. NO: Check for the proper connection.
2. Change the MMI.
7.4 SYMPTOM: THE CHART ILLUMINATION FAILED
CHECK DIAGNOSTIC / ACTION
1. Fluorescent tube out? 1. YES: Replace the fluorescent tube.
2. Is the printer operative? 2. NO: Replace power supply.
3. If still not correct 3. Replace the MMI.
7.5 SYMPTOM: DISPLAY SHOWS ONLY ALL DOTS LIGHT OR INCOHERENT DISPLAY
CHECK DIAGNOSTIC / ACTION
1. Check if the flat cable connection between
MMI and CPU board is correct.
1. NO: Check for the proper connection.
2. Change the CPU board.
3. Change the MMI.
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