Alliance Laundry Systems BU170S Service Manual download pdf (Page 85)

70422201R1

LED OPL and UniLinc Troubleshooting

47.No Display

Is there 24 volts AC

at H1-1 to H1-3

Is there 24 volts AC

at H1-2 to H1-4?

Check Transformer

and Fuse F4.

Replace

I/O Board (AP1).

Replace or

repair harness.

Yes

TMB2377S

NOTE: On the UniLinc LCD-equipped machines, verify the contrast is set correctly prior to troubleshooting.

Is there 24 volts AC at

H8-1 to H8-3?

Is there 24 volts DC

at H3-13 to H3-11, closest

to the front-end control

(AP2?)

(1)

(2)

(3)

(4a)

CAUTION: Always power down the machine

PRIOR to disconnecting or connecting the

H3 harness. Once disconnected, you can

power up the machine for troubleshooting.

Failure to do so may damage the front-end control.

NOTE: The following checks are DC

voltage checks.

NOTE: The pins H1-2 and H1-4 on I/O Board that connect

to pins H8-1 and H8-3 on the front-end control only provide

24 volts AC to the front-end control's network circuitry.

Yes

Is there 29 - 33 volts DC

at H3-14 to H3-11?

Yes

Is there 5 volts DC at

H3-12 to H3-11?

(4b)

Replace

front-end control (AP2.)

(4c)

NOTE: If the voltage is present but

lower than 24 volts AC, ensure the

correct transformer configuration

jumper is installed.

Verify correct transformer

configuration jumper is

installed. Check harness

and I/O Board (AP1).

Replace as necessary.

TMB2377S

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Alliance Laundry Systems BU170S Service Manual Page 85

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