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Service Guide ML520/521
Chapter A Reference Charts
A.2.03 Power Supply Assembly
Function
The power supply board is comprised of a noise filter board and transformer. The power supply board
provides AC voltages to the main controller board via CN-3.
Firmware
NONE
Fuses
F1: 125/250V 2.5 amp. AC line fuse
Jumpers
NONE
Sensors
NONE
Switches
SW: Power Switch
Test Points
Transformer secondary voltages
CN 3 pin 1: 17.5 VAC
CN 3 pin 2: 0 VAC
CN 3 pin 3: 6.6 VAC
CN 3 pin 4: 0 VAC
CN 3 pin 5: 0 VAC
CN 3 pin 6: 6.6 VAC
CN 3 pin 7: 0 VAC
CN 3 pin 8 : 18.5 VAC