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SITE SPECIFICATIONS
Troubleshooting Procedures
Checking the SOLID STATE RELAYS for Correct Operation
ESD
Possible damage from electrostatic discharge.
[1] Measure the voltage between CONTACTS 1 and 2. See the figure.
(a) If the controlled component should be operating, you should measure +5 V DC at CONTACTS 3 and 4,
and a voltage of no more than 2 V AC at CONTACTS 1 and 2. If you measured more than 2 V AC at
CONTACTS 1 and 2, install a new RELAY and a new MOV.
(b) If the controlled component should not be operating, you should measure an AC voltage equal to the AC
supply voltage. If you measured an AC voltage of less than the AC supply voltage, install a new RELAY
and a new MOV.
[2] If the tests done in both Steps a and b passed, the failure is not the SOLID STATE RELAY, but the WIRING
HARNESS or the controlled component.
(a) Remove the MOV. Check the MOV for continuity.
If continuity, install a new MOV.
If no continuity, install a new RELAY and a new MOV.
Figure 3 Locating the CONTACTS
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CONTACT 3
CONTACT 1
CONTACT 4
CONTACT 2
CONTACT 3
CONTACT 2
CONTACT 4
CONTACT 1
H130_0227GCB
H130_0227GA
October 1994 – 981093
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