84417_O&I_TR-810_C
Operating Instructions
Page 5-7
Menu path: Bite
Parameter:
Range
Default Details
5 volt
4,3VDC to 5,6VDC
5V
Alarm 5V
The +5V is out of range. Check X-82770 Transceiver
Board, and measure test point TP_+5V.
Possible faults: Step down converter IC143 or some
of its surrounding components.
5 volt REF
4,3VDC to 5,6VDC
5V
Alarm 5V REF
The +5V_REF is out of range. Check X-82770
Transceiver Board, and measure test point
TP+5V_REF. Possible faults: Regulator IC126 or some
of its surrounding components.
3 volt
2,7VDC to 3,3VDC
3V
Alarm 3V
The +3V is out of range. Check X-82770 Transceiver
Board, and measure test point TP_+3V.
Possible
faults: Regulator IC141 or some of its surrounding
components.
Current
< 5A
4,0A
Alarm Cur
The current consumption in the transceiver is too
high (above 5A). Check X-82770 Transceiver Board.
Possible faults: +12V shorted to GND, defective
output stage etc.
IF current
20mA to 60mA
40mA
Alarm IF
The current consumption in the 1 IF circuit is out of
range. Check X-99205 Main Board, 1 IF mixer.
Possible faults: Q143 or some of its surrounding
components.
LNA current
10mA to 30mA
24mA
Alarm LNA
The current consumption in LNA is out of range.
Check X-82770 Transceiver Board, Front ended.
Possible faults: Transistor Q148 and its surrounding
components.
Modulation
0% to 100%
90%
Synth TX
Alarm Synth TX
Transmitter synthesizer is out of lock. Check X-
82770 Transceiver Board, TX Synth & VCO. Possible
faults: Defective synthesizer circuit IC127, oscillator
Q126 or any surrounding components. Check critical
soldering points.
Synth RX
Alarm Synth RX
Receiver synthesizer is out of lock. Check X-82770
Transceiver Board, RX Dual synth & VCO. Possible
faults: Defective synthesizer circuit IC137, oscillators
Q131/Q142 or any surrounding components. Check
critical soldering points.
Table 5.7-1, Submenus available on the Bite menu
