Sony HCD-S20 Service Manual page 15

2. Flow When "OVER CURRENT" is Displayed
"OVER CURRENT" is Disconnect the USB board and check if the
displayed on the VFD. display persists.
Exchange the MAIN board.
3. Flow When "PROTECT" is Displayed
"PROTECT" is Check the if the voltage at pin 1 of CON2 on
displayed on the VFD. the POWER board is +12V.
Exchange the MAIN board.
4. Flow When "LOCKED" is Displayed
"LOCKED" is displayed Hold down [STOP] button of remote commander and
on the VFD when [OPEN/CLOSE] button of main unit for 5 seconds.
[OPEN/CLOSE] button And the check if "UNLOCKED" is displayed on the
is pressed. VFD.
HCD-S20
NG
Exchange the USB board.
OK
NG
Exchange the POWER board.
OK
NG
Exchange the POWER board.
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HCD-S20