Samsung AM072BXV Series, Service Manual

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Samsung Electronics 82
Troubleshooting
1. Cause of problem
Yes
Indoor Unit Installation Quantity Setup Switch of Outdoor
Unit Compare and check the set value and the actual number
of indoor units installed.
Press the reset key (K3) of the outdoor PBA, and check the
display module to check for the quantity of indoor units
that respond to the tracking.
Remove the communication cable which connects the outdoor
unit to the indoor unit, and measure the 2 cables of the outdoor
unit with a scope.
Is there no sign of
the indoor response on the display
during tracking?
Check the communication cable
which connects the outdoor unit to the indoor unit.
If there is no peculiarity, then connect the indoor units one by one to find the
indoor unit that is interfering with the communication for inspection and change
the indoor unit PBA.
Is the voltage between
the 2 cables a square wave with DC±0.7V or more
as shown in the image below?
Are the number of
actual installed indoor units and the set value for the
installation quantity setup
switch the same?
Correctly set the indoor unit installation quantity setup
switch of the outdoor unit, and press the reset key (K3) of
the outdoor PBA to re-execute tracking.
After 2 minutes, find the indoor unit which
displays the communication error for the indoor units, and
check for overlaps in the PBA address setup.(If the indoor
unit addresses are overlapped, then a communication error
will occur).
- In this case, a communication error will occur
in every indoor unit (two or more units) with
the address incorrectly set.
Change the indoor unit PBA after checking
the communication cable when there is
no peculiarity with the address.
Check the communication cable and
the connector of the outdoor unit PBA,
and change the PBA.
Yes
No
No
No
* Essential Requirements before Changing PBA in Case of
Communication Error: Refer to p.50
Yes
0.7V
0.7V
Good
Defective
Outdoor unit
display
Indoorunit
display
Duct, Cassette (1/2 Way),Console, Celing Cassette (4/Mini4 Way) Wall-mounted (NeoForte)
Operation Defrost Timer Fan Filter/
MPI Operation Defrost Timer Filter Operation Timer Turbo 24
℃
27
℃
× × ◑ ◑ × × ◑ ◑ × × × ◑ ◑ ×
※ ●
: ON
◑
: Flash ×: OFF
Judgment
Method
• Communication error between indoor and outdoor units.
Cause of
problem
• Refer to the judgment method below.
4-3 Appropriate Measures for Different Symptom (cont.)
4-3-3 Communication Error between Indoor and Outdoor Units during Tracking