Sine Systems RFC-1/B Instruction Book

Troubleshooting Hints and Shortcuts
Trouble at Installation
The following are the most common problems experienced during installation, listed in order
of descending frequency of occurrence.
Problem: Everything works but telemetry can not be calibrated.
Possible Solution: Adjustment of the wrong pot. The telemetry connections are counted
from left to right from the rear of the RP-8 panel, but the pots are counted from right to left
as viewed from the front of the panel. In other words, channel 00 will be adjusted with far
right pot.
Problem: Nothing works. The wall plug transformer is not putting out 12 volts AC.
Possible Solution: A ribbon cable connector was incorrectly installed (usually one connector
installed backward) and shorted the wall plug transformer. This connects pins 1 and 2 to pins
15 and 16; a dead short. The transformer itself has an internal non-replaceable fuse. If
you ’ re in a bind, there is a suitable replacement available at Radio Shack (part number 273-
1610).
Problem: Telemetry works OK but control functions don't work. RFC-1 speaks "Error."
Possible Solution: Finish reading Chapter 11. The digits ” 66" (operate mode) need to be
entered before control functions are enabled.
Problem: The telemetry channels read "Status: Off."
Possible Solution: Either the telemetry polarity is backward (+ to - and - to +) or the
calibration pot is turned all the way down.
Problem: The telemetry channels read "Status; On."
Possible Solution: The telemetry calibration pot is turned up too high.
Trouble after Installation
Virtually every known failure of an RFC-1 has been due to lightning damage. The most
common scenario is lightning entering on the telephone line, flashing across the contacts of
RY1 and entering the power supply via R21 and/or R22. The following steps are suggested as
the quickest way to repair an RFC-1 in the field with minimal test equipment. If a bench
power supply is available, testing can be speeded up quite a bit by setting the supply voltage to
17 volts (DC), setting the current limiting to about 400 milliamperes, and connecting it to the
12 VAC terminals on the RP-8 panel in place of the wall plug transformer. Normal supply
current for the RFC- 1 is in the range of 250 to 450 milliamperes.
3.01.1
Troubleshooting and Repair
page 7.6

Sine Systems RFC-1/B Specifications

General

Brand	Sine Systems
Model	RFC-1/B
Category	Remote Control
Language	English