FUNAI A0C72EP, Service Manual

Page: 24 / 75

8-4 A0C70TR
AL+5V is not output.
FLOW CHART NO.12
Is approximately 5.5V voltage supplied to the cathode
of D616?
Check if there is any leak or short-circuit on the
loaded circuit, and service it if defective.
Yes
Check D616, C614 and their periphery circuit, and
service it if defective.
No
P-ON+11V is not output.
FLOW CHART NO.14
Yes
No
Is approximately 15V voltage supplied to the
collector of Q609?
Is approximately 12V voltage supplied to the
base of Q609?
No
Yes
Replace Q609.
Replace Q606.
P-ON+3.3V is not output.
FLOW CHART NO.13
Is approximately 5V voltage supplied to the collector
of Q606?
Yes
Check D616, C614 and their periphery circuit, and
service it if defective.
Check D612, D620, C613 and their periphery circuit,
and service it if defective.
Check Q607, Q610, D639, P-ON-H2 line and their
periphery circuit, and service it if defective.
No
Is approximately 3.5V voltage supplied to the base
of Q606?
Yes
Check Q607, Q610, D671, P-ON-H2 line and their
periphery circuit, and service it if defective. No
When pressing each switches (SW101-SW106) do
the voltage of Pin(11) on CN403 increase?
Yes
No
FLOW CHART NO.15
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.