Read Sony CPD-420GS Service Manual online
— 1 —
CPD-420GS
SPECIFICATIONS
D98
Picture tube
Video image area
Resolution
Standard image area
Input signal
Video
Sync
0.25-0.27 mm aperture grill pitch
19 inches measured diagonally
90-degree deflection Trinitron
19 inches measured diagonally
90-degree deflection Trinitron
(18" maximum viewing image)
Approx. 365 X 274 mm (w/h)
(14
Approx. 365 X 274 mm (w/h)
(14
3/8
x 10
7/8
inches)
Horizontal: Max. 1600 dots
Vertical: Max. 1200 lines
Vertical: Max. 1200 lines
Approx. 352 x 264 mm (w/h)
(13
(13
7/8
x 10
1/2
inches)
Analog RGB (75 ohms typical)
0.7 Vp-p, Positive
External HD/VD, Composite
Polarity Free TTL
Video Composite (Sync on Green)
0.3 Vp-p, Negative
0.7 Vp-p, Positive
External HD/VD, Composite
Polarity Free TTL
Video Composite (Sync on Green)
0.3 Vp-p, Negative
Power Consumption
Maximum
Nominal
Nominal
Deflection frequency
AC input voltage / current
Dimensions
Mass
CHASSIS
130 W
100 W
100 W
Horizontal: 30 to 96 KHz
Vertical: 48 to120 Hz
Vertical: 48 to120 Hz
100 to 120 V, 50/60 Hz, 1.7A
220 to 240V, 50/60Hz, 1.2A
220 to 240V, 50/60Hz, 1.2A
444 x 467 x 455 (w/h/d)
(17
(17
1/2
x 18
1/2
x 18 inches)
Approx. 26 kg (57 lb 5 oz)
SERVICE MANUAL
Design and specifications are subject to change without notice.
CPD-420GS
COLOR MONITOR
CPD-420GS
China Model
Chassis No. SCC-L20A-A
— 2 —
CPD-420GS
POWER SAVING FUNCTION
This monitor has three Power Saving modes.
By sensing the absence of a video signal from the
computer, it reduces power consumption as follows:
By sensing the absence of a video signal from the
computer, it reduces power consumption as follows:
NOTE:
If no video signal is input to the monitor, the
"NO INPUT SIGNAL" message appears. After
about 30 seconds, the Power Saving function
automatically puts the monitor into active-off
mode and the indicator lights up orange. Once
the monitor detects horizontal and vertical sync
signals, the monitor automatically resumes
normal operation mode.
"NO INPUT SIGNAL" message appears. After
about 30 seconds, the Power Saving function
automatically puts the monitor into active-off
mode and the indicator lights up orange. Once
the monitor detects horizontal and vertical sync
signals, the monitor automatically resumes
normal operation mode.
SELF DIAGNOSIS FUNCTION
When a failure occurs, the STANDBY/TIMER lamp will flash a set number of times to indicate
the possible cause of the problem. If there is more than one error, the lamp will
identify the first of the problem areas.
the possible cause of the problem. If there is more than one error, the lamp will
identify the first of the problem areas.
Status
Area of Failure
LED Indication
1
Failure 1
HV or B+
Orange (0.5 second)/Off (0.5 second)
2
Failure 2
H Stop, V Stop, Thermal
Orange (1.5 second)/Off (0.5 second)
3
Failure 3
ABL
Orange (0.5 second)/Off (1.5 second)
4
Aging/Self Test
Orange (0.5 second)/Off (0.5 second)/
Green (0.5 second)/Off(0.5 second)
TIMING SPECIFICATION
MODE
1
2
3
Resolution (H x V)
720 X 400
1280 X 960
1600 X 1200
Dot Clock (MHz)
2 8 . 3 2 1
1 4 8 . 5 0 0
2 0 2 . 5 0 0
HORIZONTAL
Hor. Freq. (kHz)
3 1 . 4 6 8
8 5 . 9 3 8
9 3 . 7 5 0
H-Total
3 1 . 7 7 9
1 1 . 6 3 6
1 0 . 6 6 7
H-Blanking
6 . 3 5 6
3 . 0 1 7
2 . 7 6 5
H-Front Porch
0 . 6 3 6
0 . 4 3 1
0 . 3 1 6
H-Sync.
3 . 1 7 8
1 . 0 7 7
0 . 9 4 8
H-Back Porch
2 . 5 4 2
1 . 5 0 8
1 . 5 0 1
H-Active
2 5 . 4 2 3
8 . 6 2
7 . 9 0 1
(
µ
sec)
VERTICAL
Ver. Freq. (Hz)
7 0 . 0 8 4
8 5 . 0 0 2
7 5 . 0 0 0
V-Total
4 4 9
1 0 1 1
1 2 5 0
V-Blanking
4 9
5 1
5 0
V-Front Porch
1 3
1
1
V-Sync.
2
3
3
V-Back Porch
3 4
4 7
4 6
V-Active
4 0 0
9 6 0
1 2 0 0
( l i n e s )
SYNC.
Int (G)
No
No
No
Ext (H/V)/Polarity
Yes -/+
Yes +/+
Yes +/+
Ext (CS)/Polarity
No
No
No
Int/Non Int
Non Int
Non Int
Non Int
P o w e r
Required Recovery
State
Consumption
T i m e
Power Indicator
1 Normal Operation
< 130W
Green on
2 Standby (1st mode)
< 15W
approx. 5 sec.
Green and orange alternate
3 Suspend (2nd mode)
< 15W
approx. 5 sec.
Green and orange alternate
4 Active-off (3rd mode)
< 8W
approx. 5 sec.
Orange
5 Power-off
0 W
Off
6 Failure modes
See below
— 3 —
CPD-420GS
1.5 k
Ω
0.15 µF
AC
Voltmeter
(0.75 V)
Voltmeter
(0.75 V)
To Exposed Metal
Parts on Set
Parts on Set
Earth Ground
SAFETY CHECK-OUT
(US Model only)
After correcting the original service problem, perform
the following safety checks before releasing the set to the
customer:
the following safety checks before releasing the set to the
customer:
LEAKAGE TEST
The AC leakage from any exposed metal part to earth ground
and from all exposed metal parts to any exposed metal part having
a return to chassis, must not exceed 0.5 mA (500 microampere).
Leakage current can be measured by any one of three methods.
a return to chassis, must not exceed 0.5 mA (500 microampere).
Leakage current can be measured by any one of three methods.
W A R N I N G ! !
W A R N I N G ! !
W A R N I N G ! !
W A R N I N G ! !
W A R N I N G ! !
NEVER TURN ON THE POWER IN A CONDITION IN WHICH THE
DEGAUSS COIL HAS BEEN REMOVED.
DEGAUSS COIL HAS BEEN REMOVED.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY SHADING AND MARK
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 APPEAR AS SHOWN IN THIS MANUAL OR IN
SUPPLEMENTS PUBLISHED BY SONY. CIRCUIT ADJUSTMENTS
THAT ARE CRITICAL FOR SAFE OPERATION ARE IDENTIFIED
IN THIS MANUAL. FOLLOW THESE PROCEDURES WHENEVER
CRITICAL COMPONENTS ARE REPLACED OR IMPROPER
OPERATION IS SUSPECTED.
PARTS LIST ARE CRITICAL FOR SAFE OPERATION. REPLACE
THESE COMPONENTS WITH SONY PARTS WHOSE PART
NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN
SUPPLEMENTS PUBLISHED BY SONY. CIRCUIT ADJUSTMENTS
THAT ARE CRITICAL FOR SAFE OPERATION ARE IDENTIFIED
IN THIS MANUAL. FOLLOW THESE PROCEDURES WHENEVER
CRITICAL COMPONENTS ARE REPLACED OR IMPROPER
OPERATION IS SUSPECTED.
AVERTISSEMENT!!
NE JAMAIS METTRE SOUS TENSION QUAND LA BOBINE DE
DEMAGNETISATION EST ENLEVEE.
DEMAGNETISATION EST ENLEVEE.
ATTENTION AUX COMPOSANTS RELATIFS A LA
SECURITE!!
LES COMPOSANTS IDENTIFIES PAR UNE TRAME ET PAR UNE
MARQUE
MARQUE
¡
SUR LES SCHEMAS DE PRINCIPE, LES VUES
EXPLOSEES ET LES LISTES DE PIECES SONT D'UNE
IMPORTANCE CRITIQUE POUR LA SECURITE DU
FONCTIONNEMENT. NE LES REMPLACER QUE PAR DES
COMPOSANTS SONY DONT LE NUMERO DE PIECE EST
INDIQUE DANS LE PRESENT MANUEL OU DANS DES SUPPLE-
MENTS PUBLIES PAR SONY. LES REGLAGES DE CIRCUIT
DONT L'IMPORTANCE EST CRITIQUE POUR LA
SECURITE DU FONCTIONNEMENT SONT IDENTIFIES DANS
LE PRESENT MANUEL. SUIVRE CES PROCEDURES LORS DE
CHAQUE REMPLACEMENT DE COMPOSANTS CRITIQUES, OU
LORSQU'UN MAUVAIS FONTIONNEMENT SUSPECTE .
IMPORTANCE CRITIQUE POUR LA SECURITE DU
FONCTIONNEMENT. NE LES REMPLACER QUE PAR DES
COMPOSANTS SONY DONT LE NUMERO DE PIECE EST
INDIQUE DANS LE PRESENT MANUEL OU DANS DES SUPPLE-
MENTS PUBLIES PAR SONY. LES REGLAGES DE CIRCUIT
DONT L'IMPORTANCE EST CRITIQUE POUR LA
SECURITE DU FONCTIONNEMENT SONT IDENTIFIES DANS
LE PRESENT MANUEL. SUIVRE CES PROCEDURES LORS DE
CHAQUE REMPLACEMENT DE COMPOSANTS CRITIQUES, OU
LORSQU'UN MAUVAIS FONTIONNEMENT SUSPECTE .
1. Check the area of your repair for unsoldered or
poorly-soldered connections. Check the entire board
s u r f a c e f o r s o l d e r s p l a s h e s a n d b r i d g e s .
s u r f a c e f o r s o l d e r s p l a s h e s a n d b r i d g e s .
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.
Be absolutely certain that you have replaced all the
insulators.
4. L o o k f o r u n a u t h o r i z e d r e p l a c e m e n t p a r t s ,
particularly transistors, that were installed during
a previous repair. Point them out to the customer
and recommend their replacement.
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.
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.
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.
be suspicious of your HV meter if sets always have
low HV.
8. C h e c k t h e a n t e n n a t e r m i n a l s , m e t a l t r i m ,
“metallized" knobs, screws, and all other exposed
metal parts for AC Leakage. Check leakage as
described below.
metal parts for AC Leakage. Check leakage as
described below.
1. A commercial leakage tester, such as the Simpson 229 or
RCA WT-540A. Follow the manufacturers' instructions to
use these instructions.
use these instructions.
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"
indication is 0.75 V, so analog meters must have an accurate
low voltage scale. The Simpson's 250 and Sanwa
SH-63Trd are examples of passive VOMs that are suitable.
Nearly all battery operated digital multimeters that have a
2V AC range are suitable. (See Fig. A)
indication is 0.75 V, so analog meters must have an accurate
low voltage scale. The Simpson's 250 and Sanwa
SH-63Trd are examples of passive VOMs that are suitable.
Nearly all battery operated digital multimeters that have a
2V AC range are suitable. (See Fig. A)
— 4 —
CPD-420GS
TABLE OF CONTENTS
Section Title Page
1. GENERAL
................................................................................... 5
2. DISASSEMBLY
2-1. Cabinet Removal ............................................................12
2-2. Service Position .............................................................. 12
2-3. D, A, H and N Board Removal...................................... 12
2-4. Picture Tube Removal ................................................... 13
2-2. Service Position .............................................................. 12
2-3. D, A, H and N Board Removal...................................... 12
2-4. Picture Tube Removal ................................................... 13
3. SAFETY RELATED ADJUSTMENT
................................. 14
4. ADJUSTMENTS
........................................................................ 15
5. DIAGRAMS
5-1. Block Diagram ................................................................19
5-2. Circuit Boards Location ................................................. 22
5-3. Schematic Diagrams and Printed Wiring Boards ...... 22
5-2. Circuit Boards Location ................................................. 22
5-3. Schematic Diagrams and Printed Wiring Boards ...... 22
1. D Board - Schematic Diagram ................................. 23
2. A Board - Schematic Diagram ................................. 27
3. H Board - Schematic Diagram .................................. 31
4. N Board - Schematic Diagram .................................. 32
2. A Board - Schematic Diagram ................................. 27
3. H Board - Schematic Diagram .................................. 31
4. N Board - Schematic Diagram .................................. 32
5-4. Semiconductors ............................................................. 35
6. EXPLODED VIEWS
6-1. Chassis ............................................................................ 37
6-2. Packing Materials .......................................................... 38
6-2. Packing Materials .......................................................... 38
7. ELECTRICAL PARTS LIST
................................................ 39
