A1" Indoor Unit: Pc Board Defect - Panasonic Mini UM S Service Manual

Mini UM S/M
4.2

"A1" Indoor Unit: PC Board Defect

A1
Remote
Controller
Display
Applicable
All indoor unit models
Models
Method of
Check data from E2PROM.
Malfunction
Detection
Malfunction When data could not be correctly received from the E2PROM
Decision E2PROM : Type of nonvolatile memory. Maintains memory contents even when the power
supply is turned off.
Conditions
Supposed
Causes
Troubleshooting
Troubleshooting
Defect of indoor unit PC board
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
Turn power supply OFF, then
power ON again.
Does
the system return
to normal?
NO
Troubleshooting by Indication on the Remote Controller
YES
External factor other than
malfunction (for example,
noise etc.).
Replace the indoor unit PC
board.
(V2777)
105