Sony GDM-F500 Service Manual ▷ View online
GDM-F500
2-7. H1, H2 AND J BOARDS REMOVAL
2-8. US BOARD REMOVAL
2-4
CN2601
Cushion
Stand cover
2
US board
5
Shield case
4
1
Six screws
(+ BVTP 3 x 10)
Three screws
(+ BVTP 3 x 10)
3
Claw
Four screws
(Tapping screw 5)
CN801
H1 board
Bezel assembly
1
2
4
3
Two screws
(+ BVTP 3 x 10)
Two screws
(+ BVTP 3 x 10)
5
Claw
Claw
Claw
J board
CN891
8
7
H2 board
6
Knob
GDM-F500
3
When 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
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-CAP
1
Don’t hurt the surface of anode-caps with shartp shaped
material!
material!
2
Don’t press the rubber hardly not to hurt inside of anode-caps!
A material fitting called as shatter-hook terminal is built in the
rubber.
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 terminal will stick out or hurt the rubber.
The shatter-hook terminal will stick out or hurt the rubber.
•
REMOVAL OF ANODE-CAP
NOTE: Short circuit the anode of the picture tube and the anode cap to the metal chassis, CRT shield or carbon painted on the CRT, after
removing the anode.
•
REMOVING PROCEDURES
1
Turn up one side of the rubber cap in
the direction indicated by the arrow
the direction indicated by the arrow
a
.
2
Using a thumb pull up the rubber cap
firmly in the direction indicated by the
arrow
firmly in the direction indicated by the
arrow
b
.
2-9. PICTURE TUBE REMOVAL
a
b
c
Anode Button
2-5
Open the D block
(Refer to 2-2.)
(Refer to 2-2.)
GND (DY)
6P (DY)
10P (DY)
Four screws
(+ BVTT 4 x 8)
A board
Open the G block
(Refer to 2-3.)
(Refer to 2-3.)
Neck assembly
EMI spring (4)
Deflection yoke
Picture tube
Three connectors
Anode cap
1
2
3
4
5
6
8
9
7
GDM-F500
2-10. HARNESS LOCATION
2-6
CN901
CN671 CN672
CN801
CN802
CN803
CN891
CN2601
CN604
CN5003
CN5004
CN5002
CN5001
CN501
CN509
CN690
CN673
CN605
CN603
CN520
CN504
CN503
CN510
CN506
CN513
CN508
CN502
CN512
CN511
CN408
CN402
CN401
CN407
CN403
CN406
CN405
CN409
FBT
G board
L board
AC inlet
A board
I/O terminal board
assembly
assembly
D board
Rear shield
US board
Picture tube
J board
H1 board
H2 board
Stand assembly
GDM-F500
When replacing or repairing the shown below table, the
following operational checks must be performed as a
safety precaution against X-rays emissions from the unit.
d) Beam Current Protector Circuit Check-1
(Hardware)
Connect a variable resistor (20 k
Ω
or more) and an am-
meter in series between pin !¡ of T901 (FBT) and –15
V line. Decrease gradually the resistance of the vari-
able resistor from maximum to minimum, and confirm
that the Beam Current Protector Circuit works and TV
Raster disappears. The current must be within the
range shown below.
Check Condition
•
Input signal
: White Cross Hatch at 120.7 kHz
•
Beam control : BRT = 0, CONT
= 0
•
Standard
: 1.49 mA
e) Beam Current Protector Circuit Check-2
(Software)
1) Short between + of C937 and GND.
2) Connect a variable resistor (20 k
Ω
or more) and an
ammeter in series between pin !¡ of T901 (FBT) and
–15 V line. Decrease gradually the resistance of the
variable resistor from maximum to minimum, and
confirm that the Beam Current Protector Circuit
works and TV Raster disappears. The current must
be within the range shown below.
Check Condition
•
Input signal
: White Cross Hatch at 120.7 kHz
•
Beam control : BRT = 0, CONT
= 0
•
Standard
: 1.59 mA
*
Confirm one minute later turning on the power.
a) B+ Voltage Check
Check Condition
•
Input voltage : 100 ~ 240 VAC
•
Input signal
: White Cross Hatch at 120.7 kHz
•
Beam control : BRT and CONT
→
MAX
•
Standard
: 200 ± 3.0 V DC
b) HV Regulator Circuit Check
1) Confirm that the voltage of the + side of C910 on G
board is within the voltage range shown below.
Standard: 8.940 ~ 9.065 V DC
c) HV Protector Circuit Check
1) Confirm that the voltage between cathode of D913
on G board and GND is more than 26.5 V DC.
2) Confirm that the HV protector circuit works and TV
Raster disappears when apply the voltage as shown
below between cathode of D913 and GND using an
external DC power supply.
Check Condition
•
Input voltage : 100 ~ 240 VAC
•
Input signal : White Cross Hatch at 120.7 kHz
•
Beam control : BRT and CONT
→
MIN
•
Standard
: Less than 34.20 V DC
SECTION 3
SAFETY RELATED ADJUSTMENT
Part Replaced (
])
G Board IC901, T901
•
Mounted G board
G Board Q907,
Q908,
D913,
D916,
C923,
R920,
R927,
R952,
T901
•
Mounted G board
D Board R011,
R1068
•
Mounted D board
G Board IC901, IC902, Q907,
Q908,
D902,
D918,
D919,
R923,
R928,
R933,
R934,
R942,
R944,
R945,
R947,
R948,
R951,
R952,
T901
•
Mounted G board
HV Regulator
Circuit Check
Circuit Check
HV Protector
Circuit Check
Circuit Check
Beam Current
Protector Circuit
Check
Protector Circuit
Check
3-1
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