Samsung YP-U5, Service Manual

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Samsung Electronics 4-7
Troubleshooting
2
Is the voltage on R14 between
2.0V and 2.6V while the button
is being pressed?
Does the button on the
PCB work when pressing it?
Check that the resistance
is R14=1KΩ, R90=100KΩ, and R32=4.7KΩ.
Is the soldering done correctly?
Repair or replace the knob key and
check it again.
Repair the elements and check it
again.
Replace the board
(Detailed inspection is required.)
No
Yes
No
Yes
No
Faulty user/recording button
Yes

Refer to wave pattern
image of Fig. 4-2.