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RTU-292 Operations Manual
Table 6-1 Fault Analysis
No LEDs light after power-up Check for correct setting of DC voltage switch S6. Check for proper polarity of
DC input. (If polarity is reversed, the unit will not be damaged, but will not
operate.
At power-up, the PEAK LED
flashes at a steady rate and the
unit does not function properly.
The RTU-292 has failed its self-test function. Check for proper seating of the
internal DSP module. Contact JPS Customer Service.
At power-up, POWER LED is
lighted, but dim. Unit does not
function.
DC Voltage selector switch S6 set to default +24/28 VDC setting, but input
voltage is +12V.
The PEAK LED never flashes
on radio receiver audio.
The TEL LINE/RADIO button must be ON for the PEAK LED to function.
or
Audio input from the receiver is set too low. Adjust RX Input potentiometer
R116 fully CW for maximum input. If LED still does not flash on audio peaks,
check receiver audio connections. If using unbalanced input, be sure that
remaining balanced audio terminal is grounded. See 2.10 for audio adjust
procedures.
The PEAK LED is on nearly
continuously.
Excessive audio level from the radio receiver. Adjust R116, the RX Input
potentiometer, CCW. If LED still flashes too often after R116 is fully CCW,
lower audio level at receiver. See 2.10 for audio adjust procedures.
The TEL-LINE/RADIO LED
flashes for more than three
seconds after the TEL-
LINE/PHONE button is pushed.
The RTU-292 is having difficulty during initial adaptation cycle. Probable
noise, conversation, dial tone, or busy signal on the phone line while the unit is
trying to adapt.
The TEL-LINE/RADIO LED
flashes for more than ten
seconds after the TEL-
LINE/PHONE button is pushed.
The RTU-292 was not able to complete its initial adaptation cycle. Probable
extreme noise, dial tone, busy signal, or other type of signal present on the
phone line. Be certain that a good telephone connection is obtained before
pushing the TEL LINE/PHONE button.
The VOX does not function. The VOX is disabled while the TEL-LINE/RADIO is not ON.
The VOX is disallowed if the unit has not been able to adapt.
VOX false triggers on audio
peaks from the receiver.
Excessive audio level from the receiver or overdrive of the phone line. If the
PEAK LED is flashing normally on receiver voice peaks (see 2.10), check the
setting of the telephone send and receive levels.
Also, extremely bad phone line is possible.
JPS Communications, Inc.
6-24