Toshiba Carrier TCB-IFDMR01UP-UL Service Manual page 13

 Settings for each type (TA, TF, DDC)
Set with the SW501 switch on the control P.C. board MCC-1777.
TA type: Set all SW501 to OFF.
Turn off Bit3 of SW501.
ON
SW501
OFF
TF type: Turn on only Bit2 of SW501.
Turn off Bit3 of SW501.
ON
SW501
OFF
DDC type (0 - 10 V) Stepped Control: Turn on only Bit3 of SW501. (Refer to AI3 / AI3 for details)
ON
SW501
OFF
DDC type (0 - 10 V) Linear Control: Turn on Bit3 and Bit4 of SW501. (Refer to AI3 / AI3 for details)
ON
SW501
OFF
LED position and details
D505 D504 D503
LED
1 2 3 4
1 2
3 4
1 2 3
4
1 2 3 4
D501
P.C. board LED
D501 MCU power supply
D503 Main bus communication
D504 Sub bus communication
D505 Mod bus communication When connected to Modbus, it lights up every 5 seconds.
D403 Sub bus power supply
D403
LED
Meaning of lighting
Lights when the power is turned on
Flashes every 5 seconds.
With central control: lighting and flashing every 5 seconds.
Flashes every 5 seconds.
Group: lighting and flashing every 5 seconds.
Sub bus lights while power is being supplied.
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SW501