Carrier X-POWER Series Service Manual page 153

Carrier service manual
4.7 xH0/H1
xH0: Communication error between DSP and the main chip (Display on faulty unit, all the ODU in
standby
H1: Communication error between 0537 and main chip (Display on faulty unit, all the ODU in
standby)
IR341 chip: IR 341chip is used for inverter compressor drive.
0537 chip: 0537chip is used for control the communication between indoor unit and outdoor unit, and the
communication between outdoors.
MC9S08AC128 chip: MC9S08AC128 chip is the main chip, it used for the whole system control.
Power supply for 25(CN12), 28(CN15)
and 32(CN19) terminals are abnormal
The transformer on PCB is disabled
There has electromagnetic interference
nearby the unit. Such as High-frequency
transmitter or other high strength radiation
device
Outdoor main control board is damaged
Note:
1. How to check whether power supply for 25(CN12), 28(CN15) and 32(CN19) terminals are abnormal
The voltage input for 25(CN12) and 28(CN15) terminals are both 208-230V, the voltage input between "GND" and "+5V"
terminals of 32(CN19) port is 5V, and between "GND" and "+12V" terminals of 32(CN19) port is 12V.
2. How to check whether the transformer on PCB is disabled
The voltage input for 25(CN12) and 28(CN15) terminals are both 208-230V, the voltage output of 25(CN12) terminal is AC9V
(yellow-yellow) and AC13.5V (brown-brown); the voltage output of 28(CN15) terminal is AC14.5V (yellow-yellow) and AC 16V
(blue-blue). If the voltage is out of the range, the transformer is disabled.
CN19: Power supply for PCB
Troubleshooting
H0/H1
No
No
No
Yes
Provide normal power supply
①
Yes
②
Replace the transformer
Yes
Remove the interference
Yes
Replace the outdoor
main control board
②
R410A DC Inverter Series
①
CN15: Power output for No.2
transformer
CN12: Power output for No.1
transformer
171