Samsung YP-S2 Service Manual page 27

Troubleshooting
4-1-5 When the button does not operate
When the button does
not operate
Is the button pressed?
Yes
Is the
Tact SW above the PCB
cold soldered?
No
Is the
voltage of the Tact SW
above the PCB applied?
(7)
Yes
Replace BOARD
(Requires close inspection)
4-14
Is there any
No
substance between the button
and the KNOB?
Yes Add solder to the switch
and recheck
Are the Pull
Up resistances for
No
each SW cold soldered?
(Vol+, Vol-, FF, REW: R32,
DNSe: R34, START:
R35, R37)
 Refer to wave pattern
image of Fig. 4-8.
Yes
No
SW above the PCB pressed?
Yes
No
Add solder to Pull Up
resistance and recheck
Remove the substance and
recheck
Is the Tact
(Press with finger)
No
Replace the corresponding
Tact SW (3404-001121)
Replace the button device
and recheck
Samsung Electronics
Yes