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       MODEL NAME 

REMOTE COMMANDER 

DESTINATION  

CHASSIS NO. 

RM-Y908

KP-43HT20C/53HS30C

– 3 –

(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 RECElVER 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 TO SAFE OPERATION. REPLACE 
THESECOMPONENTS WITH SONY PARTS WHOSE PART NUM-
BERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLE-
MENTS PUBLISHED BY SONY. CIRCUIT ADJUSTMENTS THAT 
ARE CRITICAL TO SAFEOPERATION 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, COURTCIR-
CUITER L’ANODE DU TUBE CATHODIQUE ET CELUI DE L’ANODE 
DU CAP AU CHASSIS METALLIQUE DE L’APPAREIL, OU AU 
COUCHE DE CARBONE PEINTE SUR LE TUBE CATHODIQUE OU 
AU BLINDAGE DU TUBE CATHODIQUE.

ATTENTION!!

AFIN D’EVITER TOUT RISQUE DELECTROCUTION PROVENANT 
D’UN CHÁSSIS SOUS TENSION, UN TRANSFORMATEUR 
D’ISOLEMENT DOIT ETRE UTILISÉ LORS DE TOUT DEPAN-
NAGE.
LE CHÁSSIS DE CE RECEPTEUR EST DIRECTEMENT RAC-
CORDÉ Á L’ALIMENTATION SECTEUR.

ATTENTION AUX COMPOSANTS RELATIFS ÁLA

SÉCURITÉ!!

LES COMPOSANTS IDENTIFIÉS PAR UNE TRAME ET PAR UNE 
MAPQUE 

! 

SUR LES SCHÉMAS DE PRINCIPE, LES VUES 

EXPLOSÉES ET LES LISTES DE PIECES CONT D’UNEIMPORTANCE 
CRITIQUE POUR LA SÉCURITÉ DU FONCTIONNEMENT. NE 
LES REMPLACER QUE PAR DES COMPOSANTS SONY DONT 
LE NUMÉRO DE PIÉCE EST INDIQUÉ DANS LE PRÉSENT 
MANUEL OU DANS DES SUPPLÉMENTS PUBLIÉS PAR SONY. LES 
RÉGLAGES DE CIRCUIT DONT L’IMPORTANCE EST CRITIQUE 
POUR LA SÉCURITÉ DU FONCTIONNEMENT SONT IDENTIFIES 
DANS LE PRÉSENT MANUEL. SUIVRE CES PROCÉDURES LORS 
DE CHAQUE REMPLACEMENT DE COMPOSANTS CRITIQUES, 
OU LORSQU’UN MAUVAIS FONCTIONNEMENT EST SUSPECTÉ.

– 4 –

Section                                Title                                      Page

Section                                Title                                      Page

......................................5

      
      2-1.      REAR BOARD REMOVAL.........................................8
      2-2.      CHASSIS ASSY REMOVAL.......................................8
      2-3.      SERVICE POSITION...................................................8
      2-4.      H2 BOARD REMOVAL ..............................................8
      2-5.      H1 BOARD REMOVAL ..............................................9
      2-6.      H3 BOARD REMOVAL (KP-43HT20) .......................9
      2-7.      H3 BOARD REMOVAL (KP-53HS30C).....................9
      2-8.      MIRROR COVER REMOVAL ....................................9
      2-9.      BEZNET ASSY REMOVAL ......................................10 
      2-10.    H4 BOARD AND S BOARD REMOVAL .................10
      2-11.    AD BOARD AND B BOARD REMOVAL................10
      2-12.    G BOARD REMOVAL ..............................................10
      2-13.    A BOARD, D BOARD AND
                  U BOARD REMOVAL ..............................................11
      2-14.    PICTURE TUBE REMOVAL ....................................11
      2-15.    HIGH-VOLTAGE CABLE INSTALLATION AND 
                  REMOVAL .................................................................11

      3-1.      SCREEN VOLTAGE ADJUSTMENT
                  (COARSE ADJUSTMENT) .......................................12
      3-2.      SCREEN (G2) ADJUSTMENT
                  (FINE ADJUSTMENT)..............................................12 
      3-3.      DEFLECTION YOKE TILT ADJUSTMENT............12
      3-4.      FOCUS LENS ADJUSTMENT .................................12
      3-5.      FOCUS VR ADJUSTMENT ......................................13
      3-6.      2-POLE MAGNET ADJUSTMENT  .........................13
      3-7.      CENTERING MAGNET ADJUSTMENT.................13
      3-8.      4-POLE MAGNET ADJUSTMENT ..........................13
      3-9.      DEFOCUS ADJUSTMENT (BLUE) .........................13
      3-10.    ELECTRICAL ADJUSTMENT BY REMOTE
                  COMMANDER..........................................................14
      3-11.    REGISTRATION ADJUSTMENT.............................25

      4-1.      P & P SUB CONTRAST
                  ADJUSTMENT (VIDEO) (SCON)............................31
      4-2.      P & P SUB CONTRAST
                  ADJUSTMENT (RF) (SCON) ...................................31
      4-3.       P & P SUB-HUE AND
                  SUB-COLOR  ADJUSTMENT (SHUE, SCOL) .......31
      4-4.      P & P SUB-HUE AND
                  SUB-COLOR ADJUSTMENT (SHUE, SCOL) ........31

      
      5-1.      HV REGULATION CIRCUIT CHECK AND
                  ADJUSTMENT ..........................................................32
      5-2.      HV HOLD DOWN CIRCUIT OPERATION
                  CHECK AND ADJUSTMENT ..................................32
      5-3.      +B MAX VOLTAGE CONFIRMATION ...................32
      5-4.      +B OVP CONFIRMATION .......................................32

      6-1.      BLOCK DIAGRAM (1) .............................................33
                  BLOCK DIAGRAM (2) .............................................34
                  BLOCK DIAGRAM (3) .............................................35
                  BLOCK DIAGRAM (4) .............................................36
                  BLOCK DIAGRAM (5) .............................................37
                  BLOCK DIAGRAM (6) .............................................38
                  BLOCK DIAGRAM (7) .............................................39
                  BLOCK DIAGRAM (8) .............................................40
                  BLOCK DIAGRAM (9) .............................................41
                  BLOCK DIAGRAM (10) ...........................................42
                  BLOCK DIAGRAM (11) ...........................................43
      6-2. CIRCUIT BOARDS LOCATION...................................44
      6-3. SCHEMATIC DIAGRAMS ............................................44
      6-4. PRINTED WIRING BOARDS  ......................................72
      6-5. WAVEFORMS ................................................................84
      6-6. IC BLOCK DIAGRAMS ................................................86
      6-7. SEMICONDUCTORS ....................................................90

      7-1.      COVER (KP-43HT20) ...............................................91
      7-2.      COVER (KP-53HS30C) .............................................92
      7-3.      CHASSIS (KP-43HT20) ............................................93
      7-4.      CHASSIS (KP-53HS30C) ..........................................94
      7-5.      PICTURE TUBE ........................................................95

........................................96

– 5 –

Lamp OFF : 
3.0 seconds

Lamp ON : 0.3 seconds

Lamp OFF : 0.3 seconds

Release of TIMER/STAND BY indicator blinking.
•

The TIMER/STAND BY indicator blinking display is released by turning OFF the power switch 
on the TV main unit or removing the plug from the power.

* One blink is not used for self-diagnosis.

•EXAMPLE

<Diagnosis Items>  <Number of Blinks>

• +B overcurrent  

2 times

• +B overvoltage

3 times

• Vertical deflection stop

4 times

< FRONT PANEL >

TIMER/STAND BY indicator

•      This device includes a self-diagnosis function.

•      In case of abnormalities, the TIMER/STAND BY indicator automatically blinks.  It is possible to predict the abnormality location 

by the number of blinks.  The Instruction Manual describes blinking of the TIMER/STAND BY indicator.  

•      If the symptom is not reproduced sometimes in case of a malfunction, there is recording of whether a malfunction was generated 

or not.  Operate the remote command to confi rm the matter on the screen and to predict the location of the abnormality.

•      When a malfunction occurs the TIMER/STAND BY indicator only blinks for one of the following diagnosis items.  In case 

of two or more malfunctions, the item which fi rst occurred blinks.  If the malfunctions occurred simultaneously, the item with 

the lower blink count blinks fi rst.

•      The screen display displays the results regarding all the diagnosis items listed below.  The display “ 0 ” means that no 

malfunctions occurred.

Note1: If a +B overcurrent is detected, stoppage of the vertical deflection is detected simultaneously. The sympton that is diagnosed first by the microcontroller is displayed on screen.
Note 2: Refer to Screen (G2) Adjustment in Section 3-1, 2 of this manual.
Note 3: If TIMER/STANDBY indicator blinks six (6) times, unplug the unit and wait 10 minutes before performing the adjustment.

7 times

Horizontal deflection stopped

• Q8035, 8038 is shorted. (D board)

8 times

High voltage error

• T8005 is faulty. (D board)

0

Power does not turn on

• Power cord is not plugged in.
• Fuse is burned out (F6001) (G board)

• Power does not come on.
• No power is supplied to the unit.
• AC power supply is faulty.

2 times

+B overcurrent (OCP)
(See Note 1)

• H. OUT (Q8024) is shorted. (D board)
• +B PWM (Q8035, 8038) is shorted. (D board)

• Power does not come on.
• Load on power line is shorted.

3 times

+B overvoltage (OVP)

• IC501 is faulty (G board)
• IC5002 is faulty (G board)

• Has entered standby mode.

4 times

Vertical deflection stopped

• +- 15V is not supplied. (D board)
• IC8003 is faulty. (A board)

• Has entered standby state after horizontal raster.
• Vertical deflection pulse is stopped.
• Power line is shorted or power supply is stopped.

5 times

White balance failure
(Not balanced)

• Video out (IC7101, 7201, 7301) is faulty. (CR, CG, CB board)
• CRT drive (IC309) is faulty. (A board)
• G2 is improperly adjusted. (See Note 2)

• No raster is generated.
• CRT cathode current detection reference pulse output is small.

6 times

LOW B OCP/OVP
(Overcurrent/over voltage)
(See Note 3)

• +5 line is overloaded. (A, B boards)
• +5 line is shorted. (A, B boards)

• No picture
• No picture

Audio error

9 times

• +- 19V line is shorted. (A, B boards)
• IC708 is faulty. (A board)
• PS701 or PS702 is opened. (A board)

• No sound