7-11: ELECTRIC INTERFACE BOARD DIAGNOSTIC CHART
The following diagram and charts provide ten quick system checks that can be performed using only a multimeter.
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| 3 | 2 | 1 |
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| 6 | 5 | 4 |
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| 9 | 8 | 7 |
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| 12 | 11 | 10 |
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| 15 | 14 | 13 |
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K1 |
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| K2 | K3 | K4 |
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10 | 7 | 4 | 1 |
| 10 | 7 | 4 | 1 |
11 | 8 | 5 | 2 |
| 11 | 8 | 5 | 2 |
12 | 9 | 6 | 3 |
| 12 | 9 | 6 | 3 |
Note: The sealed relays are not replaceable. If a relay fails the interface board must be replaced.
| 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 |
Meter Setting | Test | Pin |
| Pin |
| Results |
12 VAC Power | 50 VAC Scale | 1 of J2 |
| 3 of J2 | ||
24 VAC Power | 50 VAC Scale | 2 of J2 |
| Chassis | VAC | |
*Probe Resistance (RH) | R X 1000 OHMS | 11 of J2 |
| 12 of J2 | See Chart | |
*Probe Resistance (LH) | R X 1000 OHMS | 3 of J1 |
| 2 of J1 | See Chart | |
R X 1 OHMS | 7 of J2 |
| 4 of J2 | 0 - OHMS | ||
R X 1 OHMS | 4 of J1 |
| 7 of J1 | 0 - OHMS | ||
Latch Contactor Coil (RH) | R X 1 OHMS | 8 of J2 |
| Chassis | ||
Latch Contactor Coil (LH) | R X 1 OHMS | 5 of J1 |
| Chassis | ||
Heat Contactor Coil (RH) | R X 1 OHMS | 9 of J2 |
| Chassis | OHMS | |
Heat Contactor Coil (LH) | R X 1 OHMS | 6 of J1 |
| Chassis | OHMS | |
*Disconnect
