Dual AX440 Service Manual download pdf (Page 12)

CDI

ALIGNMENT

OF FM

SECTION

Position

of

Switch:

SELECTOR

FM

MONO

Volume

Control

Setting: Fully

counterclockwise

Disconnect

TP

zoL from

TP zoz

ALIGNMENT

OF MPX

SECTION

Position

of

Switch:

SELECTOR

. ,

FM

STEREO

Volume

Control

Setting: Fully

counterclockwise

lnput

Signal:

Main

(L+R)

40.5kHzdeviation

(602)

STEP

I

npul

Dial

S

etting

0 utput

Eq ui

pmeni

C on

nectlons

A lign

ment

Eq

ur

pment

C on n

ections

F req

uency

Level

Adjusl

Rema

rk s

Sweep

generator

to

FlVl antenna

term ina L

10.7M H

z i 0dB

Point

of

no

r

nterference

as

near

as

87MHz

Oscilloscope

TP

zot

I

zot, f zoz

T

zo:,

Primary

of

T zoc

Adjust

for maximum

sensitivity

and

symmetrical

characteristics.

2

I 00dB

Check

symmetry

of

characteristic

c urve,

3

70dB

Oscilloscope

TP zo:

T zaq

Adjust

the

primary

core

of Tzoa

56

that slope

of straight

portion

of

"S"

curve will

become

the steepest

and

adjust

the

secondary

core

so that

the center

of

"S"

curve wiil coinclde

with

the center

of

the marker.

4

Connect

TP

2ar Ia fP2a2

5

,'J,tlilri'"""o'

'o

FM

antenna

]

no, *.

20dB

(400H

z,

30%)

90MHz

0scii

loscope

TP zo:

L2o4

Adjust

for

maximum

deflection.

6

106M

H z

106MHz

CT:o:

7

Repeat

steps 5 and

6 several

times

8

:J:;il,:.".""'

,o Fr\4 Antenna

I

nor r.

20dB

(400H

z,

30"/" )

90MHz

0sci lloscope

TP zo:

l'ri:,

Adjust

maximum

defrection.

9

106MHz

l06MHz

CT zor

CI zoz

10

Repeat

steps

8 and

9

several

times.

19

kHz Pilot

7.5

kHz deviation

(102)

STE P

Circuit

to be adjusted

I

npul

Connect VTVI\4

Alignment

C on nections

S

ignal

Ad

i

ust

Rema

rk s

I

l9kHz and 38kHz

stages

MPX

Generator to

FIV

Antenna

terminal

l9kH z

AC VTVM

TPzos

f

zog

T zro

Adlust for

maximum

deflection

2

Separation

Control

lorR

AC VTVM 2

or 3

T

zro

Adjust for

mrnirnum

deflection

of

the other channel

3

Repeat

steps

7 and 2

several times.

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 20 21

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