Check At Main Power-On; Check On Outdoor Unit; Check On Indoor Unit - Toshiba Super MMU-AP0091H Service Manual

8-3. Check at Main Power-ON

After turning on the main power of the indoor units and outdoor unit in the refrigerant line to be executed with a
test operation, check the following items in each outdoor and indoor unit.
(After turning on the main power, be sure to check in order of indoor unit → → → → → outdoor unit.)
<Check on outdoor unit>
1. Check that all the rotary switches, SW01, SW02, and SW03 on the interface P .C. board of the header unit are
set up to "1".
2. If other error code is displayed on 7-segment [B], remove the cause of trouble referring to
"9. Troubleshooting".
3. Check that [L08] is displayed on 7-segment display [B] on the interface P .C. board of the header unit.
(L08: Indoor address unset up)
(If the address setup operation has already finished in service time, etc, the above check code is not dis-
played, and only [U1] is displayed on 7-segment display [A].)
Interface P.C. board
<Check on indoor unit>
1. Display check on remote controller (In case of wired remote controller)
Check that a frame as shown in the following left figure is displayed on LC display section of the remote
controller.
(Power and operation stop)
If a frame is not displayed as shown in the above right figure, the power of the remote controller is not normally
turned on. Therefore check the following items.
• Check power supply of indoor unit.
• Check cabling between indoor unit and remote controller.
• Check whether there is cutoff of cable around the indoor control P .C. board or not, and check connection
failure of connectors.
• Check failure of transformer for the indoor microcomputer.
• Check indoor control P .C. board failure.
7-segment display [A]
UNIT
SET CL
Normal status
7-segment display [B]
SW01 SW02 SW03
SET CL
Abnormal status
(Power is not normally turned on.)
92
UNIT