DOWNLOAD Sony GDM-20SE2T5 (serv.man2) Service Manual ↓ Size: 114.8 KB | Pages: 10 in PDF or view online for FREE

MICROFILM

AEP Model

Serial No, 2,350,001 and later

Chassis No. SCC-J53D-A

File this supplement with the service manual.

Section

Title

Page

........................................................

3

5-1.

Block Diagram .............................................................

5

5-2.

Frame Schematic Diagram ...........................................

8

5-3.

Circuit Boards Location ............................................... 10

5-4.

Schematic Diagrams and Printed Wiring Boards ............ 10

(1) Schematic Diagram of D Board ................................... 11

(2) Schematic Diagrams of G and L Boards ..................... 15

6-2.

Picture Tube  ................................................................ 19

6-3.

Packing Materials ......................................................... 20

L Board  ................................................................................... 21

MISCELLANEOUS ............................................................... 22

– 3 –

•

1.

Enter the full white signal. (or the full black dots signal).

2.

Adjust the contrast to the maximum.

3.

Make the screen monogreen.

4.

Adjust the brightness is easy to see with the G2 resistor.

5.

Reverse the DY, and adjust coarsely the purity magnet so
that a green raster positions in the center of screen.

6.

Moving the DY forward, adjust so that an entire screen be-
comes monogreen.

7.

Adjust the tilt of DY, and fix lightly with a clamp.

•

1.

Put the set inside the Helmholtz coil.

2.

Input the single green signal and set the CONT control to
MAX.

Note: After the W/B adjustment with 9300K, measure an aver-

age of 

Σ

Ik when a full white signal is entered in the CONT

MAX/BRT CENT status. Then make adjustment so that
the specified screen can be attained after aging for 2 hours
with Ik equivalent to 30% of the average value.

3.

Demagnetize the metal part of the chassis with the hand de-
gausser and coil degausser, and the CRT surface with the
hand degausser.
Input AC 230V to AC IN, turn on and off the power to per-
form auto degaussing. (Perform auto degaussing by setting
“MONCONREG2”=152. Return to the original value after
use.)
Demagnetize the CRT surface with the hand degausser
again.

Note:
(1) The power must be turned off during chassis degaussing.
(2) Adjust in a non-magnetic field. BV=45uT.
(3) If adjusting in a magnetic fields, add the shift from the non-

magnetic field in your estimation.

4.

Attach the wobbling coil to the designated part of the CRT
neck.

5.

Attach the sensor of the landing adjustment unit on the CRT
surface.

6.

Adjust the DY position and purity, and the DY tilt, and land-
ing of the center and 4 corners with the landing checker.

Note: Using RV701, 702, 703 and 704 on the L board, adjust the

landing of four corners.

7.

For the up/down and left/right swing, swing the DY and in-
sert a wedge so that the up and down pins are equal at the top
and bottom and the horizontal trapezoid is equal at the left
and right. Insert the wedge firmly so that the DY does not
shake.

8.

Check the landing of each corner, and if it does not satisfy
the specification, adjust the landing of four corners using
RV701, 702, 703 and 704 on the L board. If this adjustment
failed, attach the Disk-Mg onto the funnel section and add
correction value.

Note:
(1) Do not paste more than 2 magnets to one corner.
(2) Paste within 80 to 100 mm from the DY on the diagonal line

of the magnet.

(3) If using the magnet, be sure to demagnetize with the hand

degausser and check. (The power must be turned off during
chassis degaussing.)

9.

Remove the sensor and wobbling coil.

10. Switch the signal to R.G.B., and check that each color is

pure.

11. Check that the DY is not tilting, and fix the purity Mg with a

white pen.

A difference between red and blue
must be within the specification
given right.

* Adjustment and measurement should be made at the points one

inch inside the fluorescent screen.

 

±

 

6

 

±

 

6

 

±

 6

 

±

 

6

 

±

 

4

 

±

 6

 

±

 

6

 

±

 

6

 

±

 6

<Specifications>
Adjust so that the green is within
the specification given right.
Adjust RV within 

±

1.

The red and blue must be within
the specification given right with
respect to the green.

0 

±

 

3

0 

±

 7.5 0 

±

 3

0 

±

 

5

0 

±

 

5

0 

±

 5

0 

±

 

3

0 

±

 7.5 0 

±

 3

(

µ

m)

(

µ

m)

10

10

10

10

7

10

10

10

10

(

µ

m)

– 4 –

Connect the communication cable of the computer to the connector located on the D board on the monitor.  Run the service software and
then follow the instruction.

B

A

A

0.24 mm

B

9

1, 2, 3, 4, 5,

6, 7, 8, 10

0.28 mm

0.28 mm

0.32 mm

V

MODE

•

•

(1) 9300K

x = 0.283 

±

 0.010

y = 0.298 

±

 0.008

(All White)

(2) 6500K

x = 0.313 

±

 0.010

y = 0.329 

±

 0.008

(All White)

(3) 5000K

x = 0.346 

±

 0.008

y = 0.359 

±

 0.008

(All White)

•

(1) Receive an image of the white crosshatch signals (white

lines on black).

(2) Place the protrusions of the 6-fold poles magnet attached to

the CRT neck upon each other.

(3) Make rough adjustment of the H direction convergence by

using H. STAT VR (left side of the video block).

(4) Make a rough adjustment of the V direction convergence by

using “V. STAT”.

*

Set so that the protruding
parts of the 2 magnet rings
agree with each other.

XBV

XCV

B

R

B

R

R

R

B

B

R

B

B

R 

H. AMP

H. TILT (TCH)

YBH

YCH

R B

R B

•

IBM AT Computer

as a Jig

1-690-391-21

1

A-1500-819-A

Interface Unit

2

*The parts above (        ‘       ) are necessary for DAS adjustment.

1

3

D-sub

(9 Pin [female])

mini Din

(8Pin)

4 Pin

3-702-691-01

Connector Attachment

3

To BUS CONNECTOR

4 Pin

4 Pin

H.STAT

Magnet

Protrusions

60°

ƒ

Fig. 1

Fig. 3

Fig. 2

TLY YCH YBH

APH

TLH

XCV

XBV

B

a

a 

 3.5 mm

b 

 3.5 mm

a

b

b

A

MODE

A

B

9

350 mm

280 mm

1-8, 10

350 mm

280 mm

*

– 10 –

D

A

M

G

DA

H

J

L

• All capacitors are in 

µ

F unless otherwise noted. pF:  

µµ

F

50 V or less are not indicated except for electrolytic.

• Indication of resistance, which does not have one for rating

electrical power, is as follows.

Pitch: 5 mm

Rating electrical power 1/4 W (CHIP : 1/10 W)

• All resistors are in ohms.

•

: nonflammable resistor.

•

: fusible resistor.

•

¢

: internal component.

•

: panel designation, and adjustment for repair.

• All variable and adjustable resistors have characteristic curve B,

unless otherwise noted.

•

: earth-ground.

•

: earth-chassis.

• All voltages are in V.

• Readings are taken with a 10 M

Ω

 digital multimeter.

• Readings are taken with a color-bar signal input.

• Voltage variations may be noted due to normal production

tolerances.

•

*

: Can not be measured.

• Circled numbers are waveform references.

•

: B + bus.

•

: B – bus.

• When replacing components identified by 

, make the

necessary adjustments indicated. (See page 14)

• When replacing the part in below table, be sure to perfome the

related adjustment.

RESISTOR

: RN

METAL FILM

: RC

SOLID

: FPRD

NONFLAMMABLE CARBON

: FUSE

NONFLAMMABLE FUSIBLE

: RW

NONFLAMMABLE WIREWOUND

: RS

NONFLAMMABLE METAL OXIDE

: RB

NONFLAMMABLE CEMENT

COIL

: LF-8L

MICRO INDUCTOR

CAPACITOR

: TA

TANTALUM

: PS

STYROL

: PP

POLYPROPYLENE

: PT

MYLAR

: MPS

METALIZED POLYESTER

: MPP

METALIZED POLYPROPYLENE

: ALB

BIPOLAR

: ALT

HIGH TEMPERATURE

: ALR

HIGH RIPPLE

HV Regulator
Circuit Check

HV Hold-Down
Circuit Check

Beam Current
Protector Circuit
Check-1

Beam Current
Protector Circuit
Check-2

Voltage of 3rd
winding of FBT

G board

IC901
• Mounted G board

G board

D935
• Mounted G board

G board

IC901, D933, D934, R907, R908,
R909, R910
• Mounted G board

G board

R973, R974
• Mounted G board

G board

T902 (FBT)
• Mounted G board