SONY MCM-21T2 - Service Manual Immediate Download

# No.

DATA

CONTENTS

#1

2000.3

Alteration of parts supply, as the service division had changed. (P.6-2)

MODEL NAME : MCM-21T2

SERVICE MANUAL

PARTS No. : 9-978-673-01

MODIFICATION

HISTORY

* Blue characters are linking.

CHASSIS

SERVICE MANUAL

SPECIFICATIONS

MCM-21T2

G1

AEP Model

Chassis No. SCC-L22M-A

COLOR MONITOR

CRT

0.24 mm aperture grille pitch

21 inches measured diagonally

90-degree deflection

FD Trinitron

Viewable image size

Approx. 403.8

× 302.2 mm (w/h)

(16

× 12 inches)

19.8" viewing image

Recommended resolution Horizontal: 1600 dots

Vertical: 1200 lines

Standard image area

Approx. 388

× 291 mm (w/h)

(15 3/8

× 11 1/2 inches)

or

Approx. 364

× 291 mm (w/h)

(14 3/8

× 11 1/2 inches)

Deflection frequency*

Horizontal: 30 to 121 kHz

Vertical: 48 to 160 Hz

AC input voltage/current

100 to 240 V, 50 60 Hz, 2.0 1.0 A

Power consumption

Approx. 145 W

Dimensions

Approx. 498

× 491 × 478 mm (w/h/d)

(19 5/8

× 19 3/8 × 18 7/8 inches)

Mass

Approx. 32 kg (70 lb 9 oz)

Plug and Play

DDC1/2B/2Bi, GTF**

* Recommended horizontal and vertical timing condition

· Horizontal sync width duty should be more than 4.8% of total

horizontal time or 0.8

µs, whichever is larger.

· Horizontal blanking width should be more than 2.3

µsec.

· Vertical blanking width should be more than 450

µsec.

** If the input signal is Generalized Timing Formula (GTF)

compliant, the GTF feature of the monitor will automatically

provide an optimal image for the screen.

Design and specifications are subject to change without notice.

MCM-21T2

2

LEAKAGE TEST

The AC leakage from any exposed metal part to earth ground

and from all exposed metal parts to any exposed metal part hav-

ing a return to chassis, must not exceed 0.5 mA (500 microam-

peres).

Leakage current can be measured by any one of three methods.

1. A commercial leakage tester, such as the Simpson 229 or

RCA WT-540A. Follow the manufacturers' instructions to

use these instruments.

2. A battery-operated AC milliammeter. The Data Precision

245 digital multimeter is suitable for this job.

3. Measuring the voltage drop across a resistor by means of a

VOM or battery-operated AC voltmeter. The "limit" indica-

tion is 0.75 V, so analog meters must have an accurate low-

voltage scale. The Simpson 250 and Sanwa SH-63Trd are

examples of a passive VOMs that are suitable. Nearly all

battery operated digital multimeters that have a 2 V AC

range are suitable. (See Fig. A)

After correcting the original service problem, perform the fol-

lowing safety checks before releasing the set to the customer:

1. Check the area of your repair for unsoldered or poorly-sol-

dered connections. Check the entire board surface for solder

splashes and bridges.

2. Check the interboard wiring to ensure that no wires are

"pinched" or contact high-wattage resistors.

3. Check that all control knobs, shields, covers, ground straps,

and mounting hardware have been replaced. Be absolutely

certain that you have replaced all the insulators.

4. Look for unauthorized replacement parts, particularly tran-

sistors, that were installed during a previous repair. Point

them out to the customer and recommend their replacement.

5. Look for parts which, though functioning, show obvious

signs of deterioration. Point them out to the customer and

recommend their replacement.

6. Check the line cords for cracks and abrasion. Recommend

the replacement of any such line cord to the customer.

7. Check the B+ and HV to see if they are specified values.

Make sure your instruments are accurate; be suspicious of

your HV meter if sets always have low HV.

8. Check the antenna terminals, metal trim, "metallized"

knobs, screws, and all other exposed metal parts for AC

Leakage. Check leakage as described below.

Fig. A. Using an AC voltmeter to check AC leakage.

SAFETY CHECK-OUT

1.5 k

0.15

µF

AC

Voltmeter

(0.75 V)

To Exposed Metal

Parts on Set

Earth Ground

CAUTION ON DAS (ECS) CONNECTOR

· The connector for DAS (ECS) adjustment is provided inside

the cover shown below. Be careful with an electrical shock

when connecting the connector with the power supplied. Also,

return the removed cover to the home position.

Cover ECS

Rear side

WARNING!!

NEVER TURN ON THE POWER IN A CONDITION IN

WHICH THE DEGAUSS COIL HAS BEEN REMOVED.

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY SHADING AND MARK

¡ ON THE SCHEMATIC DIAGRAMS, EXPLODED

VIEWS AND IN THE PARTS LIST ARE CRITICAL FOR

SAFE OPERATION. REPLACE THESE COMPONENTS

WITH SONY PARTS WHOSE PART NUMBERS AP-

PEAR AS SHOWN IN THIS MANUAL OR IN SUPPLE-

MENTS PUBLISHED BY SONY. CIRCUIT ADJUST-

MENTS THAT ARE CRITICAL FOR SAFE OPERATION

ARE IDENTIFIED IN THIS MANUAL. FOLLOW THESE

PROCEDURES WHENEVER CRITICAL COMPONENTS

ARE REPLACED OR IMPROPER OPERATION IS SUS-

PECTED.

MCM-21T2

3

POWER SAVING FUNCTION

DIAGNOSIS

MCM-21T2

4

MODE AT PRODUCTION

MODE 8

MODE 9

MODE 10

MODE 11

MODE 12

MODE 13

MODE 14

RESOLUTION

1152 X 864

1280 X 1024

1600 X 1200

1856 X 1392

1920 X 1440

CLOCK

172.000 MHz

157.500 MHz

184.900 MHz

229.500 MHz

270.0 MHz

288.00 MHz

297.000 MHz

-- HORIZONTAL --

H-FREQ

109.694 kHz

91.146 kHz

107.002 kHz

106.250 kHz

118.838 kHz

112.50 kHz

112.500 kHz

usec

H. TOTAL

9.116

10.971

9.346

9.412

8.415

8.889

H. BLK

2.419

2.844

2.423

2.440

2.489

2.444

2.424

H. FP

0.186

0.406

0.173

0.279

0.237

0.444

0.485

H. SYNC

0.744

1.016

0.692

0.837

0.830

0.778

0.754

H. BP

1.488

1.422

1.558

1.325

1.422

1.222

1.185

H. ACTIV

6.698

8.127

6.923

6.972

5.926

6.444

6.465

-- VERTICAL --

V. FREQ (HZ)

120.015 Hz

85.024 Hz

99.91 Hz

85.000 Hz

94.692 Hz

75.00 Hz

75.000 Hz

lines

V. TOTAL

914

1072

1071

1250

1255

1500

V. BLK

50

48

47

50

55

108

60

V. FP

21

2

1

2

1

V. SYNC

33

3

V. BP

45

44

42

46

50

104

56

V. ACTIV

864

1024

1200

1392

1440

-- SYNC --

INT(G)

NO

EXT (H/V) /POLARITY

YES N/N

YES P/P

YES N/P

EXT (CS) /POLARITY

NO

INT/NON INT

NON INT

2000.2.8 VER.

TIMING SPECIFICATION

MODE AT PRODUCTION

MODE 1

MODE 2

MODE 3

MODE 4

MODE 5

MODE 6

MODE 7

RESOLUTION

720 X 400

640 X 480

800 X 600

1024 X 768

1152 X 864

CLOCK

28.325 MHz

25.175 MHz

56.250 MHz

67.500 MHz

94.500 MHz

111.2 MHz

108.000 MHz

-- HORIZONTAL --

H-FREQ

31.472 kHz

31.469 kHz

53.674 kHz

63.920 kHz

68.677 kHz

80.814 kHz

67.500 kHz

usec

H. TOTAL

31.774

31.778

18.631

15.644

14.561

12.374

14.815

H. BLK

6.355

6.356

4.409

3.793

3.725

3.165

4.148

H. FP

0.635

0.636

0.569

0.474

0.508

0.288

0.593

H. SYNC

3.813

1.138

0.948

1.016

1.151

1.185

H. BP

1.906

1.907

2.702

2.370

2.201

1.727

2.370

H. ACTIV

31.774

25.422

14.222

11.852

10.836

9.209

10.667

-- VERTICAL --

V. FREQ (HZ)

70.094 Hz

59.940 Hz

85.061 Hz

100.032 Hz

84.997 Hz

99.894 Hz

75.0 Hz

lines

V. TOTAL

449

525

631

639

808

809

900

V. BLK

49

45

31

39

40

41

36

V. FP

13

10

1

2

1

V. SYNC

22

33

3

V. BP

34

33

27

35

36

32

V. ACTIV

400

480

600

768

864

-- SYNC --

INT(G)

NO

EXT (H/V) /POLARITY

YES N/P

YES N/N

YES P/P

YES N/N

YES P/P

EXT (CS) /POLARITY

NO

INT/NON INT

NON INT