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

The RTU-292 has failed its self-test function. Check for proper seating of the

flashes at a steady rate and the

internal DSP module. Contact JPS Customer Service.

 

unit does not function properly.

 

 

 

 

 

 

At power-up, POWER LED is

DC Voltage selector switch S6 set to default +24/28 VDC setting, but input

lighted, but dim. Unit does not

voltage is +12V.

 

 

 

function.

 

 

 

 

 

 

The PEAK LED never flashes

The TEL LINE/RADIO button must be ON for the PEAK LED to function.

on radio receiver audio.

 

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

Excessive audio level from the radio receiver.

Adjust R116, the RX Input

continuously.

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

The RTU-292 is having difficulty during initial adaptation cycle.

Probable

flashes for more than three

noise, conversation, dial tone, or busy signal on the phone line while the unit is

seconds after the TEL-

trying to adapt.

 

 

 

LINE/PHONE button is pushed.

 

 

 

 

 

 

 

The TEL-LINE/RADIO LED

The RTU-292 was not able to complete its initial adaptation cycle.

Probable

flashes for more than ten

extreme noise, dial tone, busy signal, or other type of signal present on the

seconds after the TEL-

phone line. Be certain that a good telephone connection is obtained before

LINE/PHONE button is pushed.

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

Excessive audio level from the receiver or overdrive of the phone line. If the

peaks from the receiver.

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

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Nortel Networks RTU-292 operation manual Fault Analysis