AMX TXC16 Plus Specifications download pdf (Page 193)

SG-2000 MANUAL 186

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

Using the multimeter, test each test point for the following voltages:

Cathode D1 13.6 VSW (same as power supply)

Output IC1 8 VG +/- 0.3 V

Output IC2 5 VG +/- 0.2 V

Output IC3 5 V +/- 0.2 V

Input

Ground

Output

Top View

IC1, IC2, IC3

Pin 1 IC12D V REF (4V +/- 0.3V)

23.3.4 LCD Display Test

The Display Test Chip has a special program to exercise the LCD (liquid crystal

display) by sequencing through all of the possible display outputs. The

sequence is reset to 1 whenever the power is turned off. All keys on the head

are disabled except for the following three:

The POWER key functions as normal.

The VOL. key starts the sequence or resumes the sequence if

paused.

The six key pauses the sequence.

Press the VOL. key to start the sequence. Look for imperfect appearance of

digits - digits continually on or off, not complete, etc.

Pause the sequence if any of the steps do not provide the expected output and

troubleshoot the problem.

Turn off the radio and then the power supply.

23.3.5. Receive Audio Test

Setup - See Configuration schematic.

Remove the Test Head Microprocessor With Display Test Chip and replace

with Test Head Microprocessor With Normal Chip.

Connect the Display RX Audio Test Fixture as follows (see setup schematic):

One banana plug to the audio signal generator sine wave out.

One banana plug to the input of the distortion analyzer.

SPKR connector to B.U.T. J5.

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AMX TXC16 Plus Specifications Page 193