Genie GS-1530 Service And Repair Manual page 89

September 2016
How to Test a Coil Diode
Genie incorporates spike suppressing diodes in all
of its coils. Properly functioning coil diodes protect
the electrical circuit by suppressing voltage spikes.
Voltage spikes naturally occur within a function
circuit following the interruption of electrical current
to a coil. Faulty diodes can fail to protect the
electrical system, resulting in a tripped circuit
breaker or component damage.
Electrocution/burn hazard.
Contact with electrically charged
circuits could result in death or
serious injury. Remove all rings,
watches and other jewelry.
1 Test the coil resistance. Refer to Repair
Procedure, How to Test a Coil.
2 Connect a 10Ω resistor to the negative
terminal of a known good 9V DC battery.
Connect the other end of the resistor to a
terminal on the coil.
Note: The battery should read 9V DC or more when
measured across the terminals.
Resistor, 10Ω
Genie part number
3 Set a multimeter to read DC amperage.
Note: The multimeter, when set to read DC
amperage, should be capable of reading up to
800 mA.
4 Connect the negative lead to the other
terminal on the coil.
Part No. 1272217
Note: If testing a single terminal coil, connect the
negative lead to the internal metallic ring at either
end of the coil.
Note: Dotted lines in illustration indicate a reversed
connection as specified in step 6.
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GS-30 • GS-32 • GS-46 • GS-47
Service and Repair Manual
1 multimeter
2 9V DC battery
3 10Ω resistor
4 coil
Momentarily connect the positive lead from
the multimeter to the positive terminal on the
9V battery. Note and record the reading.
At the battery or coil terminals, reverse the
connections. Note and record the current
reading.
Result: Both current readings are greater than
0 mA and are different by a minimum of 20%.
The coil is good.
Result: if one or both current readings are
greater than 0 mA, or if the two current
readings do not differ by a minimum of 20%,
the coil and/or its internal diode are faulty and
the coil should be replaced.
Manifolds
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