Nortel Networks RTU-292 operation manual Fault Analysis

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