Sony Monitor Gdm F520 Manual

GDM-F520(E) 1-4
1-4. BEZEL, H2 BOARD, MAGNETIC SENSOR REMOVAL
3Bezel
7Input selector
9H2 board
5Three screws
(+BVTP 3 x 10)
4Screw  (+BVTP 4 x 16)
10
Lifting up two claws 
in the direction of arrow.
4Screw  
(+BVTP 4 x 16)
11
L1 bracket
12
Magnetic MIU-221D
sensor
2Four tapping screws (5)
8Menu button
6Control panel assembly
CN1500
CN1401
CN1400
1
Picture tube shield
Before removing the bezel assembly, secure
   the picture tube by attaching two screws to
   the picture tube shield at the positions...

GDM-F520(E) 1-5
1-5. D BOARD REMOVAL
A2 board
(C block)
Two screws
(+BVTT 4 x 6)
4
Two screws
(+BVTP 3 x 10)
3
Video block assembly
Rear plate assembly
6
Five screws
(+BVTP 3 x 10)
CN315
CN1103
CN1600
CN1601
CN1003
CN605
CN701
CN501
GND
CN602
CN601
CN318
GND
Connector (4P) Connector (4P)
1
5
2
Screw (+BVTP 3 x 10)
4
D board
7  

GDM-F520(E) 1-6
1-6. SERVICE POSITION
1
2
4
1
Remove the D board.D board 2Remove the Video block assembly.3Install the Adaptor board 
(XT MOUNT) (A-1391-123-A).4Lay the Video block assembly.
Video block assembly
Video block assembly
5Install the video block assembly.
6Put a box which is about 15cm in height 
under the D board to fix it. 
D board
Box
3  

GDM-F520(E) 1-7
1-7. PICTURE TUBE REMOVAL
4
Picture tube
1
Anode cap
(Refer to page 1-8)
2
A2 board
(C block)
3
Neck assembly
CN3
CN7CN2
CN1
GND  

CPD-G520(E) 1-8
3When one side of the rubber cap is
separated from the anode button, the
anode-cap can be removed by turning up
the rubber cap and pulling up it in the
direction of the arrow  c.
•HOW  TO  HANDLE  AN  ANODE-CAP1 Don’t scratch the surface of anode-caps with sharp shaped
material!
2 Don’t press the rubber hardly not to damage inside of anode-
caps!
A material fitting called as shatter-hook terminal is built in the
rubber.
3 Don’t turn the foot of rubber over hardly!
The shatter-hook...

GDM-F520(E) 1-9
1-8. HARNESS  LOCATION
CN602
CN601CN604 CN1102 
CN312 CN311
CN318
CN319 CN320
CN316
CN315
CN303
CN1103
CN1003
CN1401
CN1500 CN1400
CN605 CN1600
CN1
CN1 
CN3
CN1602
CN701
CN501
4P
4P5P
CN904
CN2601
Picture tube A2 board
AC inlet
D board
US board
Magnetic sensor
L2 board
N board
H2 board
CN1601  

GDM-F520(E) 2-1
SECTION  2
SAFETY  RELATED  ADJUSTMENT
HV Regulator
Circuit CheckHV Protector
Circuit CheckBeam Current
Protector Circuit
Check
When replacing or repairing the shown below table, the following
operational checks must be performed as a safety precaution against X-ra\
ys
emissions from the unit.
Part Replaced ( [)
RV901
HV ADJ
* Confirm one minute after turning on the power.
Part Replaced ( ])
D Board C925, IC901, R901, R902, R905, R924, R925, R926, RV901, T901
(FBT)• Mounted D Board
D...

GDM-F520(E) 3-1
SECTION  3
ADJUSTMENTS
Note: Hand degauss 
must be used on stand-by or power-off condition.
This model has an automatic earth magnetism correction function by using\
 an earth magnetism sensor and a LCC coil.
When using a hand degauss while monitor (LCC coil) is being operated, \
it sometimes gets magnetized, and the system may
not work properly as a result.
• Landing Rough Adjustment1. Display all white pattern (or black dot pattern).
2. Set contrast to 255.
3. Display green plain...

GDM-F520(E) 3-2
 ± 6  ± 6  ± 6
 ± 6  ± 6  ± 6
 ± 6  ± 6  ± 6
(µm)
10 10 10
10 7 10
10 10 10(µm)
The red and blue must be within the
specification given right with re-
spect to the green.
A difference between red and blue
must be within the specification
given right.
Adjust so that the green is within
the specification given right.
4 corner adjust target : within ± 1
0 ± 3 0 ± 7.5 0 ± 3
0 ± 3 0 ± 7.5 0 ± 3
0 ± 3 0 ± 7.5 0 ± 3 (µm)
14. Adjust landing by LCC_NS, LCC_LT, LCC_LB, LCC_RT, and
LCC_RB....

GDM-F520(E) 3-3
19. Check landing at each corner and in case not in specification, adjustlanding of 4 corners with LCC_NS, LCC_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, and B, and then check that the pure colors have good color purity.
22. Fix purity magnets with white paint.