Gonset G-66 - Service and Alignment; Lubrication; Malfunctioning; Alignment Procedure

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SERVICE

INSTRUCTIONS

LUBRICATION

All

mechanical

parts

of

the

receiver

have been

fac-

tory

lubricated

and

further

lubrication

is

not

recom-

mended

until

the

need

becomes

obvious.

‘The

band-

switch

and

tuning

mechanisms

can

become

stiff

or

erratic

in

operation

after

extended

use

and

this

may

be

remedied

by

the

sparing

application

of

Lubriplace

or

a

similar

lubricant.

Clean

the

pare

thoroughly

with

carbon

tetrachloride

before

applying

aew

tub

cation.

An

occasional

cleaning

of

the

entire

chassis

with

a

small

brush

or

dry

compressed

air

is

advisable.

Make

certain

that

no

components

of

the

set

are

dis-

turbed

during

this

operation.

MALFUNCTIONING

Experience

has

shown

that

nearly

90%

of

the

causes

of

malfunctioning

are

traceable

to

defective

tubes.

‘Therefore,

when

the

reason

for

lack

of

per-

formance

is

not

immediately

obvious,

check

all

tubes

before

proceeding

further.

All

component

parts

in

the

G-66

are

operated

well

below

maximum

ratings

and

parts

failures

will

be

very

infrequent,

ALIGNMENT

Realignment

of

the

receiver

should

be

considered

only

when

lack

of

sensitivity

or

selectivity

is

expe-

rienced

and

other

possible

causes

have

been

elimi-

nated.

Do

not

attempt

alignment

without

the

use

of

a

well-calibrated

signal

generator

of

good

quality,

If

possible,

the

signal

generator

should

be

checked

ainst

a

100-ke

crystal

frequency

standard

as

each

alignment

frequency

is

set

up.

Use

a

General

Cement

No.

GC-8606,

or

equivalent,

alignment

tool

for

rf-

coil_adjustments.

A

small

screwdriver,

preferably

insulated,

is

required

to

adjust

the

i-f

transformer

cores.

ALIGNMENT

PROCEDURE

a.

Connect

a

VTVM

to

junction

of

R20

and

cermi-

nal

lug

of

T3.

Adjust

VTVM

to

read

appro

mately

5

volts

de

full

scale.

b,

Sec

controls

as

follows:

ANTENNA

to

mid-capacity

setting

FUNCTION

switch

to

ANL-OFF

VOLUME

control

to

ON

BFO

tw

0

CALIBRATION

TRIMMER

set-screw

hole

directly

forward

c.

Connect

signal

generator

through

0.001

mfd

or

larger

blocking

capacitor,

Adjust

generator

out-

put

so

that

VTVM

reading

does

not

exceed

3

volts

during

alignment.

Step]

Sig,

Generator

Sig.

Generator

Band

Switch

Tuning

Dial

Remarks

Frequency

Connection

Po

s

1

265

ke

6BES,

pin

7

BC-160

M

Adjust

12,

T3,

14,

T5

for

maximum

output

2

2050

ke

BC

Ant.

Input

BC-160

M

1.8m¢

Adjust

T1

for

maximum

output

3

2580

ke

BC

Ant.

Input

OM

IR

me

Adjust

L2

for

minimum

output

4

600

ke

BC

Ant.

Input

60

M

6me

Adjust

BC

ose

coil

for

maximum

output

5

1890

ke

BC

Ant.

Input

BC-1c0

M

1.8

me

Adjust

C110

for

maximum

output

6

[Repeat

steps

4

and

5

until

adjustments

coincide

7

809

ke

BC

Ant.

Input

BC-160

M

-Bmc

Adjust

BC

mixer

coil

See

note

helow

for

maximum

output

8

3600

ke

HF

An.

Input

80M

3.60

me

Adjust

80

M

ose

coil

for

maximum

output

9

3950

ke

HE

Ane.

Inpuc

89M

3.95

me

Adjust

C106

for

maximum

output