MAINTENANCE
HT4400 Instruction Manual 5-17
3
Power Distribution PCB1 - Status Indicators
See page 6-5 for location of Power Distribution Board.
Notes: When circuit breaker CB1 is switched ON, LEDs D3-D5 will illuminate and stay illuminated.
To measure voltages at the power distribution board, find fuses F1, F2 and F3. When the power supply is
energized, take measurements from the top of each fuse to chassis ground, and then from the bottom of
each fuse to chassis ground. Measurements should be as follows:
F1: 240 VAC
F2: 120 VAC
F3: 24 VAC
If voltages are not present, or incorrect at one or more of these points, disconnect power and
troubleshoot fuses and associated pins, connectors and wiring between power distribution board
connector J10 and control transformer secondary T1.
Also, check wiring and connections between T1, CB1, and CON1.
D3
240 VAC
D4
120 VAC
D5
24 VAC
F1 F2 F3
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