8-2 PL11.9TR
When pressing each switches (SW4001~SW4006)
do the voltage of Pin(6) of CN4052 decrease?
Ye s
The key operation is not functioning.
FLOW CHART NO.8
Are the contact point and installation state of the key
switches (SW4001~SW4006) normal?
Re-install the switches (SW4001~SW4006) correctly
or replace the Function CBA Unit.
Replace the Function CBA Unit or IR Sensor CBA
Unit.
Ye s
Replace Digital Main CBA Unit.
No
No
Check for short-circuiting or leak on the load circuit,
and service it if defective.
AL+5V is not output.
FLOW CHART NO.5
Is approximately +5V voltage supplied to the
cathode of D1102?
No
Ye s
Check C1102, D1102 and their periphery circuit,
and service it if defective.
Check for short-circuiting or leak on the load circuit,
and service it if defective.
P-ON+12V is not output.
FLOW CHART NO.7
Is approximately +12V voltage supplied to the
cathode of D1735(D1736, D1737, D1738)?
No
Ye s
Check C1736, C1737, D1735, D1736, D1737,
D1738 and their periphery circuit, and service it if
defective.
Check for short-circuiting or leak on the load circuit,
and service it if defective.
PANEL+24V is not output.
Is approximately +24V voltage supplied to the
cathode of D1714(D1715)?
No
Ye s
Check C1725, C1727, C1728, D1714, D1715 and
their periphery circuit, and service it if defective.
FLOW CHART NO.6
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