Ritron, Inc.
505 West Carmel Drive
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Carmel, IN 46032
P.O. Box 1998
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Carmel, IN 46082
Ph: 317-846-1201
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Fax: 317-846-4978
Email:
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web: www.ritron.com
Publication No. 14670015
RQX 6-Series and 7-Series Callbox
Modification for Normally Closed Relay Switch
Ritron 6-Series and 7-Series callboxes are equipped with a 1-Amp relay switch for remote control applications.
The relay is configured from the factory to provide a normally–open switch contact when in a standby condition,
with the relay switch closing only when the programmed conditions are met. Refer to your RQX Owner’s
Manual for information about programming the RQX for switch operation.
The callbox can be modified per the following instructions to reverse the relay switch operation. The RQX will
now provide a normally-closed switch contact, with the relay switch opening only when the programmed
conditions are met.
1. Carefully remove the PCB assembly per the instructions in the RQX Maintenance and Repair Manual
(RQX-MRM-e).
2. Identify the PCB revision and refer to the correct illustration below.
3. Cut the PCB trace as indicated below to disconnect the normally open relay contact.
4. Solder a 2” length of #24 AWG stranded wire as indicated below to connect the normally closed relay
contact. Note: Older PCB revisions require a 1” length of wire.
5. Reassembly the unit per the RQX Maintenance and Repair Manual (RQX-MRM-e).
PCB BOTTOMSIDE VIEW – 1750370E and later, 1750380G and later
PCB BOTTOMSIDE VIEW – 1750370D and earlier, 1750380C and earlier
Cut pcb
trace here
Connect 2” jumper
wire here
Area of detail
Connect 1” jumper wire here
Cut pcb
trace here
Area of detail