Replacement Of Service Indoor P.c. Board - Toshiba MMK-AP0072H Service Manual

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10. REPLACEMENT OF SERVICE INDOOR P.C. BOARD

Model type
MMK-AP
[Requirement when replacing the service indoor P.C. board assembly]
In the non-volatile memory (Hereinafter said EEPROM, IC10) installed on the indoor P .C. board before replace-
ment, 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. Replace the service indoor P .C. board assembly according to the follow-
ing 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>
CASE 1
Before replacement, power of the indoor unit can be turned on and the setup data can be
readout by the wired remote controller.
Replace service P .C. board & power ON (see H2 in Page 119, 120)
(If in group operation, reset the power for all indoor units which are connected to the remote controller.)
CASE 2
Before replacement, the setup data can not be read out by the wired remote controller.
Replace service P .C. board & power ON (see H2 in Page 119, 120)
Write the data such as "option input selection" setup to EEPROM (see H3 in Page 121)
H1 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.)
1. Push
,
and
SET
CL
(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 item

code (DN)
is displayed. The fan of the second indoor unit operates and the flap starts swinging if any.
P.C. board model
2H series
MCC-1510
Read EEPROM data (see H1 in Page 118, 119)
Write the read data to EEPROM (see H3 in Page 121)
Power reset
(According to the customers' information)
Power reset
buttons of the remote controller at the same time for 4 seconds or more.
Label display on P.C. board
ò
ò
ò
ò
ò
118
FILE NO. SVM-05052
04DD M01
1

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