DOWNLOAD Sony KP-43T75 / KP-48S75 / KP-53N77 / KP-53S75 / KP-61S75 Service Manual ↓ Size: 9.49 MB | Pages: 100 in PDF or view online for FREE

Model
KP-43T75 KP-48S75 KP-53N77 KP-53S75 KP-61S75
Pages
100
Size
9.49 MB
Type
PDF
Document
Service Manual
Brand
Device
TV
File
kp-43t75-kp-48s75-kp-53n77-kp-53s75-kp-61s75.pdf
Date

Sony KP-43T75 / KP-48S75 / KP-53N77 / KP-53S75 / KP-61S75 Service Manual ▷ View online

– 33 –
KP-43T75/48S75/
53N77/53S75/61S75
RM-Y906
SECTION 2
DISASSEMBLY
2-1. REAR BOARD REMOVAL
2-3. SERVICE POSITION
2-2. CHASSIS ASSY REMOVAL
2-4. HA BOARD AND  HB BOARD REMOVAL
(EXCEPT KP-43T75)
2 Rear board
1 Nine screws (Except KP-43T75)
     Eight screws (KP-43T75)
     (Screw(4x20), tapping)
1 Three screws
  (Screw(4x20),tapping)
2 Chassis assy
1 Disconnect CN203 
     on A board.
From CG board CN1304.
(The extension cable is not 
  supplied because of the
  countermeasure for radiation.)
G board
CN203
A board
2 Covers
Cut them off with a plier or the like
from chassis assembly in case of 
checking printed circuit boards.
After checking, turn over the covers 
and secure them with screws.
Screws
(+BVTP3x12)
Chassis assembly      
8 Three screws
   (+BVTP 3x12)
6 Four screws
    (+BVTP 4x12)
2 Two screws
   (+BVTP 4x12)
1 Two screws
    (Screws (4x20), tapping)
9 HB board
7 HB bracket
Speaker grille assy
5 HA board
3 HA bracket
4 Multi button
– 34 –
KP-43T75/48S75/
53N77/53S75/61S75
RM-Y906
2-6. MIRROR COVER REMOVAL
2-7. BEZNET ASSY REMOVAL
2-8. HC BOARD AND S BOARD REMOVAL
2-5. HA BOARD AND  HB BOARD REMOVAL
(KP-43T75)
7 Three screws
   (+BVTP 3x12)
3 Four screws
   (+BVTP 3x12)
5 Three screws
   (+BVTP 3x12)
1 Four screws
    (Screws (4x20), tapping)
8 HB board
Panel ASSY, Control
6 HA board
4 HA bracket
2
1 Seventeen screws(KP-43T75) 
     Twenty four screws 
     (KP-48S75)
     Nineteen screws 
     (KP-53N77/53S75)
     Twenty three screws (KP-61S75)
     (Screw(4x20), tapping)
2 Mirror cover
1 Three screws 
    (KP-43T75/48S75)
     Five screws 
    (KP-53N77/53S75/61S75)
    (Screws(4x20), tapping)
2 Eleven screws (KP-43T75)
     Twelbe screws (KP-48S75)
     Fifteen screws (KP-53N77/53S75)
     Fourteen screws (KP-61S75)
     (Screws(4x20), tapping)
3 Beznet assy
3 HC board
2 L screen holder
6 Clows
7 S board
Sensor 
bracket (B)
4 Two screws
    (+BVTP 4x12)
1 Two screws
    (+BVTP 4x12)
5 Two screws
    (+BVTP 4x12)
Sensor 
bracket (A)
– 35 –
KP-43T75/48S75/
53N77/53S75/61S75
RM-Y906
2-9. A BOARD AND G BOARD REMOVAL
2-11.  HIGH-VOLTAGE CABLE INSTALLATION
AND REMOVAL
7 Two screws
    (+BVTP 3x12)
4 Eight screws
    (+BVTP 3x12)
6 G board
9 A board
3 Terminal board
8 Claw
5 Claws
Main bracket
1 Two screws
    (Screws (4x20), tapping)
2 Seven screws
    (+BVTP 3x12)
2-10.
PICTURE TUBE REMOVAL
4 Four screws
     (Screw (4x20), tapping)
!º Four screws
    (+BVTP 4x12)
!¡ Picture tube
Picture tube
8 Deflection yoke
9 Tension
     spring*
2 Four screws
    (Screw (4x20), tapping)
3
1 Four screws
    (Screw (4x20), tapping)
7 Neck assy
6 CR board
5 Lens
Lens
* 53S75/61S75
  Serial No. 9,500,001 and higher
CAUTION: Removing the arrow-marked
screws is strictly prohibited.
If removed, it may cause liquid spill.
(1) Removal
1 Rubber cap
2 HV cable
   turn 90
°
1 HV cable
Gutter
Hook
(2) Installation
– 36 –
KP-43T75/48S75/
53N77/53S75/61S75
RM-Y906
3-1. SCREEN VOLTAGE ADJUSTMENT
(COARSE ADJUSTMENT)
1. Receive the Monoscope signal.
2. Set 50% BRIGHTNESS and minimum PICTURE.
3. Turn the red VR on the FOCUS block all the way to the left
and then gradually turn it to the right until the point where you
can see the retrace line.
4. Next gradually turn it to the left to the position where the
retrace line disappears.
R
G
B
SCREEN
R
G
B
FOCUS
FOCUS block
Fig. 3-1
SECTION 3
SET-UP ADJUSTMENTS
175 
±
 2V
G2 JIG
200V
GND
3.3k
5.6k
5.6k
5.6k
SW
K
GND
pedestal level
Fig. 3-2
3-2. SCREEN (G2) ADJUSTMENT
(FINE ADJUSTMENT)
Fine Mode is recommended to set screen controls to their optimal
condition.  It is necessary to build the simple jig, illustrated below,
using 3-watt resistors.  Please note, that if the proper voltage is not
obtained with their listed values, resistors, then please increase or
decrease one of the values in the resistor network to obtain the
correct voltage.
1. Select VIDEO1 mode without signals.
2. Connect G2 JIG.
3. SW on JIG.
4. Connect an oscilloscope to the TP701(KR), TP732(KG) and
TP761(KB) of CR board, CG board and CB board.
5. Adjust  R, G and B screen voltage to 170-173V with screen
VR on the Focus block.
3-4. FOCUS LENS ADJUSTMENT
In this adjustment, use the remote commander in the
service mode.
For details of the usage of the service mode and the remote
commander, please refer the item 3-9. ELECTRICAL
ADJUSTMENT BY REMOTE COMMANDER.
1. Loosen the lens screw.
2. Set to the service mode.
3. Receive the all-white signal.
4. Cover the both red and blue picture lenses with the lens caps
to show only the green color.
5. Set to PJE, and press 6 to display the test signal (crosshatch)“
on the screen.
6. Turn the green lens to adjust to the optimum focus point with
the test signal.
7. Tighten the lens screw.
8. Cover the both green and blue picture lenses with the lens caps
to show only the red color.
9. Set to PJE, and press 6 to display the test signal (crosshatch)“
on the screen.
10. Adjust red CRT lens just the same as green.
11. Cover the both green and red picture lenses with the lens caps
to show only the blue color.
12. Set to PJE, and press 6 to display the test signal (crosshatch)“
on the screen.
13. Adjust blue CRT lens just the same as green.
14. After adjusting the items 3-5. Focus VR Adjustment, 3-6. 2-
Pole Magnet Adjustment and 3-7. 4-Pole Magnet Adjustment,
adjust again to the optimum focus point.
*: Every time you press 6, the test signal changes to
“crosshatch+video signal” - “dots+video signal” -
“crosshach(black)” - “dots(black)” - off.
Note: Instead of items 4, 8 and 11, you can cut off the unnecessary
color beams by controlling the service mode VPNT 28 RON,
29 GON, and 30 BON.
Fig. 3-4
Test signal
3-3. DEFLECTION YOKE TILT  ADJUSTMENT
1. Receive the Monoscope signal.
2. Set in service mode.
3. Cover the both red and blue picture lenses with the lens caps
to show only the green color.
4. Loosen the deflection yoke set screw and align the tilt of the
Deflection Yoke so that the bars at the center of the
monoscope pattern are horizontal.
5. After aligning the deflection yoke, fasten it securely to the
funnel-shaped portion (neck) of the CRT.
6. The tilt of the deflection yoke for red is aligned  in the mode
Cover the both green and blue picture lenses with the lens caps
and the tilt of the deflection yoke for blue is aligned with in
Fig. 3-3
2-pole magnet
4-pole magnet
Deflection yoke
Anode cap
the mode Cover the both green and red picture lenses with the
lens caps is aligned the same as was done for green.
Note: Instead of items 3 and 6, you can cut off the unnecessary
color beams by controlling the service mode VPNT 28 RON,
29 GON, and 30 BON.
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