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
Yes
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.
Yes
Check IC1202 and the periphery circuit, and service
it if defective.
Check IC1202 and the periphery circuit, and service
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.
Yes
Is the "L" pulse supplied to the Pin(3) of CN1302?
Yes
Is 3.3V voltage supplied to Pin(3) terminal of the
infrared remote control receiver (RCV1142)?
Yes
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.
Yes
Содержание LC-15AV7U
Страница 13: ...4 2 A7121DC Fig D1 3 Rear Cabinet 1 Arm Assembly S 3 S 4 S 3 S 1 2 Stand Cover S 2 S 2 S 3 S 3 ...
Страница 43: ...9 8 NOTE CBA AND PWB MEANS PRINTED WIRING BOARD A7121SCF Function Schematic Diagram ...
Страница 44: ...9 9 NOTE CBA AND PWB MEANS PRINTED WIRING BOARD A7121SCIR IR Sensor Schematic Diagram ...