3-12
Non working functon buttons.
Is the voltage of IC501 Pin 99, 5V?
Does LED CLOCK, LED DOT display
change when a function button is
pressed?
Replace IC501.
Check the power.
Replace the defective Switch.
(Function SW)
C.
YES
YES
NO
NO
LED CLOCK, LED DOT doesn’t work.
Is 5V applied to IC501 Pins 37 and
IC5F1 Pins 5, 18?
Check the ( OPTION 1)
Do pulse appear at IC501 Pins 65, 66
and 67.
Replace IC501.
Check the power circuit.
D.
YES
YES
Do oscillation appear at IC5F1 Pin1.
YES
Check the foil patterns between IV5F1
and OPTION2.
YES
OPTION 1 : D5E4 LED CLOCK
OPTION 2 : LED 501 - LED CLOCK
LED 502 - LED DOT
Replace OPTION 2
YES
NO
NO
Replace IC5F1.
NO
Содержание GC260W
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