Lc" Outdoor Unit: Malfunction Of Transmission Between; Inverter And Control Pc Board - Panasonic U-4..6ML5XPQ Service Manual

Panasonic
LC
3.39 " " Outdoor Unit:

Inverter and Control PC Board

LC
Remote
Controller
Display
Applicable U-4..6ML5DPQ, U-4..6ML5XPQ
Models
Method of Check the communication state between inverter PC board and control PC board by micro-
computer.
Malfunction
Detection
Malfunction When the correct communication is not conducted in certain period.
Decision
Conditions
Supposed
Causes
Troubleshooting
Troubleshooting
Malfunction of Transmission between
Malfunction of connection between the inverter microcomputer and outdoor control
microcomputer
Defect of outdoor unit PC board (A1P)
External factor (Noise etc.)
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
Was the
inverter PC board or the
control PC board
replaced?
NO
Are the
connectors of the
inverter PC board and the
control PC board
securely
connected?
YES
Are there
any broken wires in
the connectors of the
inverter PC board and
the control PC
board?
NO
Troubleshooting by Indication on the Remote Controller
Are the inverter
YES
PC board and the control PC board
used in combination of types listed
in Table 1?
YES
NO
YES
Table 1: Combination of PC boards
U-4ML5XPQ
U-5ML5XPQ
U-6ML5XPQ
NO
Correct the combination following
Table 1, and then restart
operation.
Connect a connecting wire, and
then restart operation.
Repair the broken wires, and then
restart operation.
Replace the inverter PC board
(A2P) or the control PC board
(A1P).
Type of control Type of inverter
PC board PC board
EC0640-1 PC0625-1
187