Magnavox 19MF301B Service Manual Page 41

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8-10 FL11.0BTR
[Video Signal Section]
No
Is the "L" pulse sent out Pin(1) terminal of remote
control receiver (RS101) when the infrared remote
control is activated?
Check the line between Pin(1) terminal of remote
control receiver(RS101) and Pin(25) of CN301,
and service it if defective.
Ye s
Is the "L" pulse supplied to Pin(25
) of CN301?
Ye s
Is 3.3V voltage supplied to Pin(2) ter
minal of the
remote control receiver (RS101
)?
No
FLOW CHART NO.2
Operation is possible from the unit.
Check AL+3.3V line and service it if defective.
No
Replace the remote control receiver(RS101)
or the remote control unit.
Ye s
Replace Digital Main CBA Unit.
When pressing each switches (SW104~SW109)
do the voltage of Pin(29) of CN302 decrea
se?
Ye s
The key operation is not functioning.
FLOW CHART NO.1
Are the contact point and installation state of the key
switches (SW104~SW109) nor
mal?
Re-install the switches (SW104~SW109) correctly
or replace the poor switch.
Check the switches (SW104~SW109) and their
periphery, and service it if defective.
Ye s
Replace Digital Main CBA Unit.
No
No
No operation is possible from the remote control unit.
Picture does not appear normally.(Video input)
FLOW CHART NO.3
Are the video signal inputted to Pin(
4) of CN302?
Ye s
Check the line between Pin(4) of CN302 and
JK752, and service it if defective.
No
Replace Digital Main CBA Unit or LCD Module
Assembly.
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