AMX TXC16 Plus Specifications download pdf (Page 201)

SG-2000 MANUAL 194

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

23.4.5 Clock Test

Measure and record the frequency at IC10.

Pin Frequency

5 153.6 KHz +/- 63 Hz

9 4,915.2 KHz +/- 2 KHz

Measure the frequency on IC7 pin 3 and adjust C14 so that a reading of 32,768

Hz is obtained.

23.4.6 Data In/Out Check

This procedure tests if data signals are reaching TXD and RXD on UART (IC8).

Data Out Check

Press SW5 (RS-232 out). DS3 (SG-2000 out) should turn off and DS4 (RS-232

out) should turn on. Releasing SW5 will return to original stage.

RS-232 Data In Check (Main CPU only): Press SW3 (RS-232 Sin). IC8 pin 2

should go to 0 VDC from pulsing.

SG-2000 Data In check: Press SW4 (SG-2000 Sin). IC8 pin 2 should go to 0 VDC

from pulsing.

23.4.6 Battery Installation (Main CPU only)

(Note: The presence or absence of the battery will not affect the tests described so far.)

Remove +.

Check the place where the battery will be installed with a DMM in the ohms

position, it should read not less than 3 M?.

The battery should read not less than 2.8 VDC before being soldered onto the

CPU.

Secure the battery with foam before soldering it on top of IC14 and IC 12.

While the CPU is removed from the radio, check that pin 2 of IC7 reads 2.8

VDC.

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AMX TXC16 Plus Specifications Page 201