8-2
PL11.8TR
When pressing each switches (SW4001~SW4006)
do the voltage of Pin(6) of CN4052 decrease?
Yes
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.
Yes
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 approxi5V voltage supplied to the
cathode of D1102?
No
Yes
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 approxi12V voltage supplied to the
cathode of D1735(D1736, D1737, D1738)?
No
Yes
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 approxi24V voltage supplied to the
cathode of D1714(D1715)?
No
Yes
Check C1725, C1727, C1728, D1714, D1715 and
their periphery circuit, and service it if defective.
FLOW CHART NO.6