AMX TXC16 Plus Specifications download pdf (Page 168)

SG-2000 MANUAL 161

The SGC Building, 13737 S.E. 26th St. Bellevue, WA. 98005 USA

23.1.23 Coupler Port Check

J502 provides a coupler (like the SG-230 Pro and SG-235) with 13.6V and takes

receive tuning status indication which is then passed to the Head and

displayed as TND.

Putting J501 pin 3 to GND momentarily should have the result of the TND

indicator being displayed.

23.1.24 Alarm Generator Check

Connect a 50? dummy load to the SG-2000 RF Out and verify that a 2-tone

telephony alarm signal is automatically transmitted in A3J, USB, VOC, Hi PWR

modes for 45 seconds by pressing:

SHIFT - keep depressed

EMER - press momentarily

The alarm generator can be stopped at any time by pressing the EMER key.

23.1.25 Power Failure Recovery Check

With the radio in receive, turn the power supply off.

Wait two minutes then turn the power supply back on. The radio should turn

on by itself and be in the same frequency and mode as before the power shut

down.

TROUBLESHOOTING

This is a list of the most common reasons for test failures. DC and RF levels

should be those noted in the Voltages Values tables

23.1.26 Receive Troubleshooting

1) dB S/N at J301 Audio Out is less than 10 dB for PCB versions F and earlier or

less than 15 dB for versions G and later.

Check that the attenuator is OFF.

2) No receive in A3H mode

Check that FL202 was selected only

Check that the AM detector voltage levels are correct and that Q506 is

turned on.

3) AGC Failure

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AMX TXC16 Plus Specifications Page 168