Toshiba MM-A0280HT Service Manual page 85

Server outdoor alarm
An error occurs in the slave outdoor unit. Confirm the check code of the slave unit, and
check it according to the diagnostic procedure for each check code.
There is an error with the temp. sensor incorporated in IGBT. Check connectors CN07 on
IPDU P .C. board and CN600 on interface P .C. board. If there is no problem,
replace IPDU P .C. board.
Open/short of TK1 was detected. Check connection (TK1 sensor: CN516) and resistance
value characteristics of the sensor.
If sensor is normal, replace the outdoor interface P .C. board.
14
Open/short of TK2 was detected. Check connection (TK2 sensor: CN515) and resistance
value characteristics of the sensor.
If sensor is normal, replace the outdoor interface P .C. board.
Open/short of TK3 was detected. Check connection (TK3 sensor: CN507) and resistance
value characteristics of the sensor.
If sensor is normal, replace the outdoor interface P .C. board.
Troubleshooting
Diagnostic Procedure for Check Code
Check code
[d2]
Check code
[d3]
TH sensor alarm
Check code
[d4]
TK1 sensor alarm
Check code
[d5]
TK2 sensor alarm
Check code
[d6]
TK3 sensor alarm
Operation cause
Defective slave outdoor unit
Operation cause
Error of temp. sensor incorporated in IGBT
(Inverter Gate Bi-Polar Transistor)
Operation cause
TK1 sensor open/short
Operation cause
TK2 sensor open/short
Operation cause
TK3 sensor open/short
86