7-6
A7121TS
When pressing each switches (SW1101,SW1102,
SW1103,SW1104,SW1105,SW1107,SW1111) do the
voltage of each pin of CN102A (shown below)
increase?
SW1101,1102,1103,1104,1105,1107 : CN1301 PIN 2
SW1111 : CN1301 PIN 1
Ye s
No
The key operation is not functioning.
FLOW CHART NO.19
Are the contact point and installation state of the key
switches (SW1101,SW1102,SW1103,SW1104,
SW1105,SW1107,SW1111) normal?
Re-install the switches (SW1101,SW1102,SW1103,
SW1104,SW1105,SW1107,SW1111) correctly or
replace the poor switch.
No
Check the switches (SW1101,SW1102,SW1103,
SW1104,SW1105,SW1107,SW1111) and their
periphery, and service it if defective.
Ye s
Check IC1202 and the peripher
y circuit, and service
it if defective.
Check IC1202 a
nd the periphery circuit, and ser
vice
it if defective.
No
Is the "L" pulse sent out Pin(1) terminal of receiver
(RCV1142) when the infrared remote control is
activated?
Check the line between Pin(1) terminal of receiver
(RCV1142) and Pin(3) of CN1302 , and service
it if defective.
Ye s
Is the "L" pulse supplied to the Pin(
3) of CN1302?
Ye s
Is 3.3V voltage supplied to Pin(3) ter
minal of the
infrared remote control receiver (RCV1142)?
Ye s
No
No operation is possible from the remote control unit.
FLOW CHART NO.20
Operation is possible from the remote control unit.
Check AL+3.3V(D) line and service it if defective.
No
Replace the infrared remote control receiver
(RCV1142) or the remote control unit.
Ye s
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