8-4
A0C76TR
P-ON+11V is not output.
FLOW CHART NO.13
Yes
No
Is approximately 13V voltage supplied to the
collector of Q506?
Is approximately 12V voltage supplied to the
base of Q506?
No
Yes
Replace Q506.
See FLOW CHART NO.5 <AMP+24V is not output.>
Check Q501, Q502, P-ON-H2 line and their periphery
circuit, and service it if defective.
No
Is the "L" pulse sent out Pin(1) of RS101 (remote control
receiver) when the infrared remote control is activated?
Check the line between Pin(1) of RS101 (remote
control receiver) and Pin(13) of CN905, and service
it if defective.
Yes
Is the "L" pulse supplied to Pin(13) of CN905?
Yes
Is 3.3V voltage supplied to Pin(2) of RS101 (remote
control receiver)?
No
No operation is possible from the remote control unit.
FLOW CHART NO.15
Operation is possible from the unit.
Check AL+3.3V line and service it if defective.
No
Replace the RS101 (remote control receiver) or
remote control unit.
Yes
Replace Digital Main CBA Unit.
When pressing each switches (SW101-SW106) do
the voltage of Pin(31) on CN502 increase?
Yes
No
FLOW CHART NO.14
Are the contact point and installation state of the key
switches (SW101-SW106) normal?
Re-install the switches (SW101-SW106) correctly or
replace the poor switch.
No
Check the switches (SW101-SW106) and their
periphery, and service it if defective.
Yes
Replace Digital Main CBA Unit.
The key operation is not functioning.
