Wireless Intercom System Service Manual

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ALIGNMENT PROCEDURE:

)

Equipment Required:

D Signal Generator

D Audio Generator

D Deviation Meter

D Audio Voltmeter

1.

Connect the audio generator to the AUX

IN

jack

and set the output

to

20 mV at 1

KHz.

2.

Select the AUX pushbutton on

therront

panel.

3.

Adjust VR601 (locatedjust under the

I1C

push-

button

on

the

front

panel)

to

maximum

counterclockwise.

4.

If

the base is configured

for

an RTS intercom

connect the load

to

the

llC

jack pn the rear

panel.

5.

Connect the audio voltmeter to the AUX OUT

0

jack on

the

rear panel.

6.

Adjust VR101 for a minimum reading.

7.

Disconnect the generator and meter from the

AUX jacks and de-select the AUX pushbutton

on the front panel.

8.

Connect the signal generator to the Receive

Antenna jack. Set the deviation to

± 3 KHz at

1

KHz.

Setthe output to 1 m

V.

Setthe frequen-

cy to the channel 1frequency listed in the chart

of

the receive board alignment.

-

I

9.

Select the channel 1 pushbutton on the front

panel.

10.

Connect

the

deviation

meter

to the

ANT

TRANS jack.

11.

Connect the audio voltmeter to U106 pin

7.

12A. On version 1 and 2 audio boards, adjust VR102

for

300 mV

of

audio.

12B. On version

3 and later audio boards with ver-

sion 1 transmit boards, adjust VR102 for 1 volt

of

audio.

12C. On version

3 and later audio boards with ver-

sion 2 transmit boards, first move the audio

voltmeter to

U501 pin 16 (on the transmit

board). Then adjust VR102 for 140 mV

of

audio.

13. Adjust VR501 for

± 4.2 KHz deviation.

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