Board Exchange Procedures - Toshiba Carrier MMD- AP0074BH2UL Service Manual

10. P.C. BOARD EXCHANGE PROCEDURES
10.2 High Wall type
In the non-volatile memory (Hereinafter said EEPROM, IC10) installed on the indoor P .C. board before
replacement, the type and capacity code exclusive to the corresponding model have been stored at shipment
from the factory and the important setup data such as refrigerant line /indoor unit /group address in
(AUTO/MANUAL) mode have been stored at installation.
Part code
4316V483
Replace the service indoor P .C. board assembly according to the following procedure.
After replacement, make sure that the indoor unit address is set correctly and also the refrigerant cycle is
working correctly by test operation.
<Replacement procedure>
Method 1
Before replacement, power of the indoor unit can be turned on and the setup data can be readout
by the wired remote controller.
(If in group operation, reset the power for all indoor units which are connected to the remote controller.)
Method 2
Before replacement, the setup data can not be read out by the wired remote controller.
Write the data such as "option input selection" setup to EEPROM : Procedure 3
Procedure1: Readout of the setup data from EEPROM
(Data in EEPROM contents, which have been changed at the local site, are read out together with data in
EEPROM set at shipment from the factory.)
SET CL TEST
1. Push , and
(Corresponded with No. in Remote controller as shown below picture)
∗ When group operation, the header indoor unit address is displayed at the first time. In this time, the CODE
No. (DN) is displayed. The fan of the second indoor unit operates and the flap starts swinging if any.
Model type
MMD-AP¬¬¬BH2UL series
Read EEPROM data : Procedure 1
Replace service P.C. board & power ON : Procedure 2
Write the read data to EEPROM : Procedure 3
Replace service P.C. board & power ON : Procedure 2
(According to the customers' information)
buttons of the remote controller at the same time for 4 seconds or more.
ò
ò
ò
Power reset
ò
ò
Power reset
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P.C. board model
MCC-1510
1