Tandy CM-8 User Manual

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CRT

GREEN

RASTER

Figure 12. Color Purity Adjustment

PURITY

MAGNETS

FOUR-POLE

CONV.

MAGNETS

SIX-POLE

CONV

.

MAGNETS

A

36mm

( 1

.417

inches)

A

DEFLECTION

YOKE

Tl

LT

ADJUSTMENT

WEDGE

Figure 13. Picture Tube Neck Components Location

9.

Black and

White

Tracking

1.

Make

the

following

settings.

Contrast

control

(R465)

and

brightness

control

(R459):

maximum

R/G/B bias

controls

(R862,

R863

,

R864)

:

minimum

R/B

drive

controls

(R856,

R858):

center

2.

Set

the

sub

-

contrast

control

(R454)

to

center

po

-

sition

.

3.

Connect

an

oscilloscope

between

TP451

and

the

ground.

Adjust

the

sub

-

brightness

control

(R458)

to

achieve

a

pedestal

level

of

4 . 8 V

De.

4.8Voc

(White

Signal)

_____________

_J_

___

0

Level

4.

Hook

up

the

computer

and

give

an

input

for

a

black

signal.

(The

raster

should

not

be

shining

during

the

whole

display

period

:

horizontal,

44

.

698

µ.sec

and

verti

-

cal,

14

.

331

msec

.)

18

5.

Turn

off

th

e

sw

it

ch (

SW851

).

6.

Adjust

the

scre

en

control

(on

T602)

so

that

the

raster

is

dimly

shining.

7.

Achieve

white

balance

using

the

other

two

bias

controls

for

the

shining

color

(for

example

, blue and

green

when

the

raster

is

shining

in red).

8.

Adjust

the

screen

control

to

obtain

the

"just

cut

off"

position

.

9.

Using

the

computer,

feed

a

white

signal

input

in-

stead

of

the

black

one.

10

.

Turn

on

the

service

switch

(SW851)

.

11.

Achieve

white

balance

again

with

the

R/B

drive

controls

(R856

,

R858).

12.

Using

a

gray

scale

signal

(16-graduation

color

difference

signal

is

formed

during

all

the

display

period

:

horizontal

44.698

µ.

sec

and

vertical

14.

331

msec)

,

check

to

see

if

the

1 6

colors

show

up

and

if

the

low

and

high

white

balance

is

proper.

If

any

of

the

16

colors

fails

to

show

up

,

fine

-

adjust

the

sub-brightness

control

(R458)

. If

the

low

and

high

white

balance

is

not

achieved

,

readjust

the

R/B

drive

controls

.

13.

Set

the

sub

-

contrast

co

ntrol

(

R454)

to

obtain

a

beam

level

of

5.2

~gf

V .

14

.

Repeat

Step

12

abo

v

e.

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Tandy CM-8 Specifications

General

Brand	Tandy
Model	CM-8
Category	Monitor
Language	English

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