Samsung SR-S25NTA Service Manual page 47

(4) When KEY selection of PANEL DISPLAY does not work,
® Repair us'ng the instruction
in Reference No. 1 Connection
Diagram of CABINET-DOOR |
On push of bution, c h e
the signal is inputted
connector (CN50) is normally
inserted?
Re-insertion of
MAIN-PCB connector,
Repair of trouble
Connector
insertion at PANEL PCB
is normal?
Whether
more than one KEY is pushed
continuously?
ZD501,502
on MAIN PCB is SHORT
pe fault?
GRID signal
is inputted to MICOM
PORT #1, #2?
Replacemer, of
MAIN PCB 45S'Y
Replacement of the relevant button
on PANEL-DISPLAY or Replacement
of PANEL ASS'Y PCB