SPECIFICATIONS
Picture tube
0.25 - 0.27 mm aperture grill pitch
19 inches measured diagonally
90-degree deflection
Trinitron
Power Consumption
Maximum
Nominal
130 W
100 W
Video image area
(18" maximum viewing image)
Approx. 365 x 274 mm (w/h)
(143/8 x 107/8 inches)
Deflection frequency
Horizontal: 30 to 96 kHz
Vertical: 48 to 120 Hz
Resolution
Horizontal: Max 1600 dots
Vertical: Max. 1200 lines
AC input voltage / current
100 to 120 V, 50/60 Hz, 1.7 A
220 to 240, 50/60 Hz, 1.2 A
Standard image area
Approx. 352 x 264 mm (w/h)
(137/8 x 101/2 inches)
Dimensions
444 x 467 x 455 (w/h/d)
(171/2 x 181/2 x 18 inches)
Input Signal
Video
Sync
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
Mass
Approx. 26 kg (57 lb 5 oz)
Design and specifications are subject to change without notice.
MICROFILM
US Model
AEP Model
Chassis No. SCC-L20A-A
D98 CHASSIS
Canadian Model
Chassis No. SCC-L20D-A
CPD-420GS
CPD-420GST
CPD-420GS/GST
--2--
The monitor has three Power Saving modes. 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.
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.
TIMING SPECIFICATION
State
Power
Consumption
Required Recovery
Time
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
0W
--
Off
6
Failure modes
----
See below
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)
MODE
1
2
3
Resolution (H x V)
720 x 400
1280 x 960
1600 x 1200
Dot Clock (MHz)
28.321
148.500
202.500
HORIZONTAL
Hor. Freq. (kHz)
31.468
85.938
93.750
H-Total
31.779
11.636
10.667
H-Blanking
6.356
3.017
2.765
H-Front Porch
0.636
0.431
0.316
H-Sync.
3.178
1.077
0.948
H-Back Porch
2.542
1.508
1.501
H-Active
(µsec)
25.423
8.620
7.901
VERTICAL
Ver. Freq. (Hz)
70.084
85.002
75.000
V-Total
449
1011
1250
B-Blanking
49
51
50
V-Front Porch
13
1
1
V-Sync.
2
3
3
V-Back Porch
34
47
46
V-Active
(lines)
400
960
1200
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
POWER SAVING FUNCTION
CPD-420GS/GST
--3--
After correcting the
original service problem,
perform the following safety checks before releasing the
set to the customer:
1.
Check the area of your repair for unsoldered or
poorly-soldered connections. Check the entire
board surface for solder splashes and bridges.
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.
4.
Look
for
unauthorized
replacement
parts,
particularly transistors, that were installed during 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.
6.
Check the line cords for cracks and abrasion.
Recommend the replacement of any such line cord
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.
8.
Check
the
antenna
terminals,
metal
trim,
"metallized" knobs, screws, and all other exposed
metal parts for AC leakage.
Check leakage as
described next.
Fig A
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.
1.
A commercial leakage tester, such as the Simpson
229 or RCA WT-540A. Follow the manufacturers'
instructions to 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)
WARNING!!
NEVER TURN ON THE POWER IN A CONDITION IN
WHICH THE DEGAUSS COIL HAS BEEN REMOVED.
SAFETY-RELATED COMPONENT WARNING!!
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.
AVERTISSEMENT!!
NE JAMAIS METTRE SOUS TENSION QUAND LA
BOBINE DE DEMAGNETISATION EST ENLEVEE.
ATTENTION AUX COMPOSANTS RELATIFS A LA
SECURITE!!
LES COMPOSANTS IDENTIFIES PAR UNE TRAME ET
PAR UNE 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 SUPPLEMENTS
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.
1.5 kW
0.15 µF
AC
Voltmeter
(0.75 V)
To Exposed Metal
Parts on Set
Earth Ground
SAFETY CHECK-OUT
CPD-420GS/GST
--4--
TABLE OF CONTENTS
Section
Title
Page
1.
GENERAL.............................................................................. 5
2.
DISASSEMBLY
2-1.
Cabinet Removal...................................................... 12
2-2.
Service Position ....................................................... 12
2-3.
D, H, N and A 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
1.
D Board - Schematic Diagram .......................... 23
2.
A Board - Schematic Diagram .......................... 27
3.
N Board - Schematic Diagram .......................... 31
4.
H Board - Schematic Diagram .......................... 35
5-4.
Semiconductors ....................................................... 37
6.
EXPLODED VIEWS
6-1.
Chassis (U/C Model Only)........................................ 39
6-2.
Chassis (AEP Model Only)....................................... 40
6-3.
Packing Materials ..................................................... 41
7.
ELECTRICAL PARTS LIST........................................ 43
CPD-42
0GS/GST
--5
--
The instructions given here are partial abstracts from the Operating Instruction
Manual. The page numbers shown reflect those of the Operating Instruction Manual.
SECTION 1
GENERAL