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1.11 Interface Board Diagnostic Chart
The following diagram and charts provide ten quick system checks that can be performed using only
a multimeter.
NOTE –
When testing the test points on J1
and J2 pin 1 is located in the bottom right corner of
both J1 and J2. These test points are ONLY
for boards with J1 and J2 plugs on the front
of the board.
Meter Setting
12 VAC Power
24 VAC Power
*Probe Resistance (RH)
*Probe Resistance (LH)
High-Limit Continuity (RH)
High-Limit Continuity (LH)
Latch Contactor Coil (RH)
Latch Contactor Coil (LH)
Heat Contactor Coil (RH)
Heat Contactor Coil (LH)
* Disconnect 20-Pin harness from the controller before testing the probe circuit.
PN 106-6664
Test
50 VAC Scale
50 VAC Scale
R X 1000 OHMS
R X 1000 OHMS
R X 1 OHMS
R X 1 OHMS
R X 1 OHMS
R X 1 OHMS
R X 1 OHMS
R X 1 OHMS
1-15
Diagnostic LED Legend
CMP indicates power from 12V transformer
24
indicates power from 24V transformer
HI
(RH) indicates output (closed) from right latch
relay
HI
(LH) indicates output (closed) from left latch
relay
HT
(RH) indicates output from right heat relay
HT
(LH) indicates output from left heat relay
AL
(RH) indicates output (open) from right latch
relay
AL
(LH) indicates output (open) from left latch
relay
Pin
Pin
3 of J2
1 of J2
2 of J2
Chassis
11 of J2
10 of J2
1 of J1
2 of J1
9 of J2
6 of J2
6 of J1
9 of J1
8 of J2
Chassis
5 of J1
Chassis
7 of J2
Chassis
4 of J1
Chassis
Results
12-16 VAC
24-30 VAC
See Chart
See Chart
0 - OHMS
0 - OHMS
3-10 OHMS
3-10 OHMS
11-15 OHMS
11-15 OHMS
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