Samsung MH052FDEA, Training Manual

Page: 96 / 158

95 Samsung Electronics
Troubleshooting
8-3-2 When the power voltage is not available
1. Checklist :
1) Is the power voltage is normal? (The rating voltage ±10% range)
2) Is the power cord is correctly connected and is the contact good?
3) Does the sound "ting" come out?
If it doesn't come out the sound "ting", do inspect and repair in accordance with the following inspection sequence.
2. Troubleshooting procedure
KA7805 is out of order - replace
Replace the fuse (250V, 3.15A).
Check of the installation method
and electrical circuit
No
Yes
No
Replace of
Ass'y display PCB
Replace the main PCB of indoor unit
No trouble
(normal)
Check of
remote control
Normal
Yes
Yes
No
Yes
No No
Yes
No
Yes
No
Yes
Apply the power
Is the outdoor power connected normally?
Is the fuse (F701, 250V, 3.15A) of PCB open?
Is the output voltage of electrostatic voltage
regulator IC (KA7805) DC 4.5V ~ 5.5V?
Is the operation icon( ) lamp
flickering with the sound of "ting"?
Is the operation lamp( )
of indoor unit on when
the operation /stop button
of remote control
is pressed?
Is the communication
signal of remote control
surely sent and received ?
Is there no problem
between the connector of
Ass'y display PCB and the
receiving module?
DB98_20402A(1)_2 10/26/04 3:27 PM Page 95