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COLOR REAR VIDEO PROJECTOR
SERVICE MANUAL
RA-3B CHASSIS
MODEL NAME
REMOTE COMMANDER
DESTINATION
CHASSIS NO.
KP-43T90
RM-Y906
US/Canada/Mexico
SCC-P62A-A
KP-48V90
RM-Y906
US/Canada/Mexico
SCC-P62D-A
KP-53V90
RM-Y906
US/Canada/Mexico
SCC-P62C-A
KP-61V90
RM-Y906
US/Canada/Mexico
SCC-P62B-A
9-965-907-01
Self Diagnosis
Supported model
KV-53V90
RM-Y906


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KP- 43T90 / 48V90 / 53V90 / 61V90
TABLE OF CONTENTS
Specifications ...................................................................... 3
Warnings and Cautions ....................................................... 4
Safety Check-out ................................................................. 5
Self-Diagnostic Function...................................................... 6
1. Disassembly
1-1. Rear Board Removal ........................................................... 9
1-2. Chassis Assembly Removal ................................................ 9
1-3. Service Position ................................................................... 9
1-4. HA and HB Board Removal (Except KP-43T90) ................. 10
1-5. HA and HB Board Removal (KP-43T90 only)...................... 10
1-6. Beznet Assembly Removal.................................................. 10
1-7. Mirror Cover Removal.......................................................... 11
1-8. HC Board and S Board Remvoal......................................... 11
1-9. A and G Board Removal...................................................... 11
1-10. HV Cable Installation and Removal ..................................... 12
1-11. Picture Tube Removal.......................................................... 12
2. Set-up Adjustments
2-1. Screen Voltage Adjustment.................................................. 13
2-2. Screen (G2) Adjustment ...................................................... 13
2-3. Deflection Yoke Tilt Adjustment............................................ 13
2-4. Focus Lens Adjustment ....................................................... 14
2-5. Focus Control Adjustment ................................................... 14
2-6. 2-Pole Magnet Adjustment .................................................. 15
2-7. 4-Pole Magnet Adjustment .................................................. 15
2-8. Defocus Adjustment............................................................. 15
2-9. Electrical Adjustments By Remote Commander.................. 16
2-10. Registration Adjustment (PJE mode only)........................... 21
2-11. Green Registration Adjustment ........................................... 22
2-12. Red Registration Adjustment............................................... 23
2-13. Blue Registration Adjustment .............................................. 23
2-14. Auto Registration Adjustment .............................................. 24
3. Safety Related Adjustments (G Board)
3-1. HV Regulation Circuit Check and Adjustment ..................... 25
3-2. HV Hold Down Circuit Operation Check and Adjustment .... 25
3-3. +B Max Voltage Confirmation .............................................. 26
3-4. +B OVP Confirmation .......................................................... 26
4. Circuit Adjustments
4-1. TV Input Sub Contrast Adjustment ...................................... 27
4-2. Video Input Sub-Hue and Sub Color Adjustment ................ 27
4-3. Component Input Sub-Hue and Sub-Color Adjustment....... 27
4-4. PIP Sub-Contrast Adjustment.............................................. 27
4-5. PIP Sub-Hue, Sub-Color Adjustment................................... 28
4-6. User Control Bar Graph Display Position Adjustment.......... 28
4-7. PIP Position Adjustment ...................................................... 28
5. Diagrams
5-1. Circuit Boards Location ....................................................... 29
5-2. PWB and Schematic Diagrams Information ........................ 29
5-3. Block Diagrams.................................................................... 31
5-4. Frame Schematic Diagram .................................................. 39
Schematics and Supporting Information
A Board................................................................................ 40
G Board ............................................................................... 45
CG Board............................................................................. 47
CB Board ............................................................................. 48
CR Board............................................................................. 49
S Board................................................................................ 50
HA Board ............................................................................. 50
HB Board ............................................................................. 51
HC Board............................................................................. 51
5-5. Semiconductors................................................................... 52
6. Exploded Views
6-1. Cover (KP-43T90)................................................................ 54
6-2. Chassis (KP-43T90) ............................................................ 55
6-3. Picture Tube (KP-43T90) ..................................................... 56
6-4. Cover (KP-48V90) ............................................................... 57
6-5. Chassis (KP-48V90) ............................................................ 58
6-6. Picture Tube (KP-48V90) ..................................................... 59
6-7. Cover (KP-53V90) ............................................................... 60
6-8. Chassis (KP-53V90) ............................................................ 61
6-9. Picture Tube (KP-53V90) ..................................................... 62
6-10. Cover (KP-61V90) ............................................................... 63
6-11. Chassis (KP-61V90) ............................................................ 64
6-12. Picture Tube (KP-61V90) ..................................................... 65
7. Electrical Parts List ........................................................................ 66


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KP- 43T90 / 48V90 / 53V90 / 61V90
120V AC, 60Hz
170W
1 W
Video 1 IN
Video 2 INPUT (front)
Video 3 IN
S Video IN (4-pin mini DIN)
Y: 1 Vp-p 75 ohms unbalanced, sync negative
C: 0.286 Vp-p (Burst signal), 75 ohms,
Video (phono jack)
1.0 Vp-p, 75 ohms, sync negative;
Audio (phono jacks)
500 mVrms (100% modulation), Impedance: 47 kilohms
Television system
American TV standard
Channel coverage
VHF: 2-13/ VHF: 14-69/ CATV: 1-125
Picture tube
7-inch high-brightness monochrome tubes (6.3 raster size),
with optical coupling and liquid cooling system.
Screen size (measured diagonally)
43 inches (KP-43T90)
48 inches (KP-48V90)
53 inches (KP-53V90)
61 inches (KP-61V90)
SPECIFICATIONS
Design and specifications are subject to change without notice.
Power Requirements
Power Consumption (W)
In Use (Max)
In Standby
Inputs/Outputs
Antenna
75 ohm external terminal for VHF/UHF
Supplied Accessories
Remote Control RM-Y906
Batteries (2) size AA (R6)
Optional Assessories
Connecting Cables
RK-G34, RK-74A, RK-G69HG, VMC-10HG, VMC-720M,
VMC-810S/820S, YC-15V/30V
U/V mixer EAC-66
Video 4 IN
Y: 1 Vp-p, 75 ohms, sync negative
PB: 0.7 Vp-p, 75 ohms
PR: 0.7 Vp-p, 75 ohms
Audio (phono jacks)
500 mVrms (100% modulation), Impedance: 47 kilohms
Audio (VAR/FIX) Out (phono jacks)
500 mVrms (100% modulation), Impedance: 470 ohms
Control S Out
minijack
KP-43T90
KP-48V90
KP-53V90
KP-61V90
100 mm (4 in)
100 mm (4 in)
100 mm (4 in)
160 mm (6 7/8 in)
66 mm (2 5/8 in)
17W x 2
17W x 2
17W x 2
17W x 2
965 x 1058 x 570 mm
1,105 x 1,338 x 579 mm
1,216 x 1,417 x 632 mm
1,370 x 1,560 x 670 mm
38 x 41 5/8 x 22 1/2 in
43 1/2 x 52 5/8 x 22 3/4 in
47 7/8 x 55 3/4 x 24 7/8 in
54 x 61 3/8 x 26 3/8 in
53.2 kg
64.4 kg
66 kg
92.6 kg
117 lbs
142 lbs
145 lbs
204 lbs 8 oz
Speaker
Woofer (2)
Tweeter (2)
Speaker Output (W)
Dimensions (W x H x D)
mm
in
Mass
kg
lbs


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KP- 43T90 / 48V90 / 53V90 / 61V90
WARNINGS AND CAUTIONS
CAUTION
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.
WARNING!!
An isolation transformer should be used during any service to avoid possible shock hazard, because of live chassis. The chassis of
this receiver is directly connected to the ac power line.
! 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.
ATTENTION!!
Apres avoir deconnecte le cap de l'anode, court-circuiter l'anode du tube cathodique et celui de l'anode du cap au chassis metallique
de l'appareil, ou la couche de carbone peinte sur le tube cathodique ou au blindage du tube cathodique.
Afin d'eviter tout risque d'electrocution provenant d'un chássis sous tension, un transformateur d'isolement doit etre utilisé lors de tout
dépannage. Le chássis de ce récepteur est directement raccordé à l'alimentation du secteur.
! 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 fonctionnement suspecte.


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KP- 43T90 / 48V90 / 53V90 / 61V90
SAFETY CHECK-OUT
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
touching 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 below.
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 microamperes). 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 2 VAC range are suitable (see Figure A).
How to Find a Good Earth Ground
A cold-water pipe is a guaranteed earth ground; the cover-plate retaining
screw on most AC outlet boxes is also at earth ground. If the retaining
screw is to be used as your earth ground, verify that it is at ground
by measuring the resistance between it and a cold-water pipe with an
ohmmeter. The reading should be zero ohms.
If a cold-water pipe is not accessible, connect a 60- to 100-watt trouble-
light (not a neon lamp) between the hot side of the receptacle and the
retaining screw. Try both slots, if necessary, to locate the hot side on the
line; the lamp should light at normal brilliance if the screw is at ground
potential (see Figure B).
Trouble Light
AC Outlet Box
Ohmmeter
Cold-water Pipe
Figure A. Using an AC voltmeter to check AC leakage.
Figure B. Checking for earth ground.
To Exposed Metal
Parts on Set
AC Voltmeter
(0.75 V)
Earth Ground
0.15
µF
1.5 k