DOWNLOAD Sony DHC-FL3 / GDM-C520 / GDM-C520K / HCD-FL3 Service Manual ↓ Size: 4.42 MB | Pages: 69 in PDF or view online for FREE

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4P

4P

D board

A1 board

N board

L2 board

Magnetic sensor

H2 board

Picture tube

AC inlet (3P)

1.  Turn the RV901 slowly, and adjust so that high voltage is in the 

specified range.

 

[Specification]:  27.00 ± 0.05 kV

2.  Check that the voltage of D912 cathode on the D board is 17.0V 

or more.

1.  Using external DC Power Supply, apply the voltage shown below 

between cathode of D912 and GND, and check that the RASTER 

disappears.

 

[Specification]:  19.95 ± 0.00/-0.05V

1.  Connect constant current source to a section between T901 (FBT) 

11

 pin and GND, and check that the RASTER disappears when 

the specified current flows to the 

11

 pin.

 

[Specification]:  2.12 ± 0.00/-0.051 mA

  Confirm one minute after turning on the power.

Part Replaced (    ) 

HV ADJ

RV901

Part Replaced (    ) 

D Board   C925, IC901, R901, R902, R905,

R924, R925, R926, RV901, 

T901 (FBT),

•  Mounted D Board

HV Regulator

Circuit Check

D Board   C920, C923, D911, D912, R903, 

R917, R918, R919, R920, R923, 

T901 (FBT)  

•  Mounted D Board

N Board   IC1001, RB1001

•  Mounted N Board  

N Board   IC1001, RB1001

•  Mounted N Board  

HV HOLD

DOWN  

Circuit Check

D Board   C930, D917, R921, R932, R933, 

R935, T901 (FBT) 

•  Mounted D Board

Beam Current

Protector  

Circuit Check

Connect the communication cable of the connector located on the D Board on the monitor. Run the service software and then follow the instructions.

IBM at Computer

as a Jig

1

2

3

1-690-391-21

A-1500-819-A

Interface Unit

3-702-691-01

Connector Attachment

BUS CONNECTOR

To

D-Sub

(9 Pin [female])

Mini Din

(8 Pin)

4 Pin 4 Pin

4 Pin

* The Parts above (          ) are necessary for DAS Adjustment.

1 3

~

9.  Attach a wobbling coil to the specified position of CRT neck.
10.  Put on landing sensor to CRT face.
11.  Set LCC_SW to 12.
12.  With landing checker, adjust DY position, purity, DY center and the 

landing of the 4 corners.

13.  Read VX and VY values which are read out of the magnetic sensor, 

and write to LCC_VX_REF and LCC_VY_REF.

14.  Adjust landing by LCC_NS, LSS_LT, LCC_LB, LCC_RT, and 

LCC_RB. Adjustment of registers shall be limited within the 

following range:

 

LCC_NS: 128 ± 15

 

LCC_LT, LCC_LB, LCC_RT, and LCC_RB:  128 ± 40

 

Set LCC_SW to 13, and Perform Service Save.

 ± 6

 ± 6

 ± 6

 ± 6

 ± 6

 ± 6

 ± 6

 ± 6

 ± 6

<Specifications>

Adjust so that the green is within

the specification given right.

4 corner adjust target : within ± 1

The red and blue must be within

the specification given right with

respect to the green.

A difference between red and blue

must  be  within  the  specification

given right.

0 ± 3 0 ± 7.5 0 ± 3
0 ± 3 0 ± 7.5 0 ± 3
0 ± 3 0 ± 7.5 0 ± 3

(µm)

(µm)

10

10

10

10

7

10

10

10

10

(µm)

15.  Tighten DY screw within specified torque, and auto-degauss.
 

NOTE:  Torque 22 ± 2 kgcm (2.2 ± 0.2 Nm)

  Allow a 30 minute warm-up period prior to making the following 

adjustments.

1.  Display the all white pattern.
2.  Set contrast to 255.
3.  Display plain green pattern.
4.  Slide the DY back and roughly adjust the plain green pattern with 

the purity magnet so that it is centered on the screen.

5.  Adjust the DY tilt.
 

NOTE:  Set ROTATION to 128 and LCC_NS to 128 when adjusting 

the DY tilt.

6.  Lightly tighten the DY screw.

NOTE:  (1) After  adjusting  W/B  (9300k),  measure  the  average  of  ΣΙΚ 

with  all  white  video  input,  while  CONTRAST  is  maximum 

and  BRIGHTNESS  is  centered.  Make  the  adjustments  so 

that  the  miss-landing  becomes  least  after  aging  2H  with 

the ΙΚ 30% of measured value shown above.

 

(2) The magnetic field shall be BH = 0.

 

(3) When adjusting at other than BH = 0, calculate the shifted 

value from BH = 0.

1.  Place the monitor in the Helmholtz coil.
2.  Set as follows;
 

LCC-SW = 0  (LCC Correction Current = 0)

 

FUNCTION_SW bit1 =   (Auto Degauss = On)

 

CONTRAST = 255

3.  Display plain green pattern.
4.  Degauss the iron part of the chassis with a hand-degausser and 

degauss coil. 

5.  Degauss the CRT face with degauss equipment or hand-degausser. 
6.  Input AC 230V to AC IN and turn the monitor off and on to activate 

the auto degausser.

7.  Reset FUNCTION_SW bit 1 to 0 (auto-degauss = off)
8  Repeat step 5 by degaussing the CRT face with degauss equipment 

or hand-degausser. 

16.  Adjust the vertical angle of the DY to make the top and bottom pins 

equal (a = b). The horizontal angle is not changed (straight). Settle 

DY upright without leaning, and insert wedges firmly so that the DY 

does not move.

a

b

c

d

<How to place wedge>

Green plain crosshatch pattern

a and b should be equal.

c and d should be equal.

Plaster RTV to both sides for the upper wedge.

Make sure that they settle inside DY.

Plaster RTV to one side for other wedges.

17.  Adjust the top and bottom pins correction VR.
18.  Adjust the horizontal trapezoid distortion by DY horizontal trapezoid 

correction VR.

19.  Check the landing at each corner. If the landing is not set to 

specification, adjust the landing of the 4 corners with LCC_NS, 

LSS_LT, LCC_LB, LCC_RT, and LCC_RB. The limitations of 

registers are shown below:

 

LCC_NS: 128 ± 15

 

LCC_LT, LCC_LB, LCC_RT, and LCC_RB:  128 ± 40

20.  Remove the sensor and wobbling coil.
21.  Switch signals to R, G, B, and then check that the pure colors have 

good color purity.

22.  Fix purity magnets with white paint. 

1.  Display the white crosshatch pattern.
2.  Pile the convex parts of the 6-pole magnet for convergence 

together.

3.  Roughly adjust H.CONV and V.CONV with the 4-pole magnet.

Purity

4-pole magnet
6-pole magnet
2-pole magnet

H.TRAP

TB-PIN

TLH

XCV

XBV

XCV

B

R

B

R

R

B

B

R

R

B

B

R 

TLV

TLH

YBH

YCH

R 

B

R 

B

  Convergence Specification

B

A

A

0.20 mm

B

0.24 mm

V

1.  9300 K
 

x = 0.283 ± 0.005

 

y = 0.298 ± 0.005

 

  

(All White)

2.  6500 K
 

x = 0.313 ± 0.005

 

y = 0.329 ± 0.005

 

  

(All White)

3.  5000 K
 

x = 0.346 ± 0.005

 

y = 0.359 ± 0.005

 

  

(All White)