Board Exchange Procedures - Toshiba MMU-AP0071MH Service Manual

10. P.C. BOARD EXCHANGE PROCEDURES
10-1. Exchange of P.C. Board for Indoor Service
Part code
431-6V-269
Requirement at exchange of P.C. board assembly for indoor service
Before exchange, in the fixed memory (hereinafter EEPROM, IC10) installed on the indoor P .C. board, the type
exclusive to the model and the capacity code are stored at shipment from the factory. The important setup data
such as line/indoor/group address which are set up (Auto/Manual) or high ceiling exchange setup at installation
time, respectively.
Proceed with exchange of P .C. board assembly for indoor service in the following procedure.
After exchange work, check again the setup for indoor unit No. or group header/follower units to confirm whether
the setup contents are correct or not, and then check also the refrigerant circuit system by a test operation, etc.
<Exchange procedure>
Method 1
Before exchange, it is possible to turn on power of the indoor unit and read out the setup
contents from the wired remote controller.
Power supply reset (All the indoor units connected to the remote controller in case of group operation control)
Model type
MMU-AP 1H series
MMU-AP 1MH series
MMC-AP 1H series
MMK-AP 1H series
MMD-AP 1SPH/SH series
MMU-AP 2SH series
Readout of EEPROM data: Procedure 1
Exchange of P .C. board for service & power ON: Procedure 2
Writing-in of the readout EEPROM data: Procedure 3
P.C. board model
MCC-1402
ò
ò
ò
108
Label display on P.C. board
03DD M05