SERVICE MANUAL
BA-5 CHASSIS
MODEL
COMMANDER
DEST
CHASSIS NO.
KV-20FS12
RM-Y173
US
SCC-S40A-A
KV-20FS12
RM-Y173
CND
SCC-S41A-A
KV-20FV12
RM-Y168
US
SCC-S40B-A
KV-20FV12
RM-Y168
CND
SCC-S41B-A
KV-21FE12
RM-Y173
E
SCC-S38A-A
KV-21FE12A
RM-Y173
E
SCC-S38F-A
KV-21FE12C
RM-Y173
E
SCC-S38B-A
KV-21FM12
RM-Y172
MX
SCC-S39A-A
KV-21FV12
RM-Y168
E
SCC-S38C-A
KV-21FV12C
RM-Y168
E
SCC-S38D-A
TRINITRON® COLOR TV
RM-Y168
KV-21FV12
879 Front.p65
01/31/00, 3:10 PM
1
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2
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K
V-20FS12/20FV12/21FE12/A/C/21FM12/21FV12/C
SPECIFICATIONS
Design and specifications are subject to change without notice.
Television system
American TV standard/NTSC
PAL M, N (KV-21FE12A ONLY)
Channel coverage
VHF:2-13/UHF:14-69/CATV:1-125
Visible screen size
20" picture measured diagonally
Actual screen size
21" picture measured diagonally
Antenna
75 ohm external antenna terminal for VHF/UHF
1)
Vp-p 75 ohms unbalanced, sync negative
2)
Y: 1 Vp-p 75 ohms unbalanced, sync negative
C: 0.286 Vp-p (Burst signal), 75 ohms
3)
500mVrms (100% modulation), impedance: 47kilohms
4)
More than 408 mVrms at the maximum volume setting (variable).
More than 408 mVrms (fix).
Supplied accessories
Remote Commander RM-Y168 (KV-20FV12/21FV12/21FV12C ONLY)
Remote Commander RM-Y172 (KV-21FM12 ONLY)
Remote Commander RM-Y173 (KV-20FS12/21FE12/21FE12A/21FE12C ONLY)
Size AA (R6) batteries (2)
Optional accessories
Connecting cables: VMC-810S/820S, VMC-720M,
YC-15V/30V, RK74A
U/V mixer EAC-66
KV-21FE12
KV-21FE12A
KV- 21FE12C
KV-21FM12
KV-20FS12
KV-20FV12
KV-21FV12
KV-21FV12C
Power requirements
120-220V, 50/60 Hz
120-220V, 50/60 Hz
120V,60Hz
120V,60Hz
120-220V, 50/60 Hz
120-220V, 50/60 Hz
Number of inputs/outputs
Video 1)
2
2
2
2
2
2
S Video 2)
1
1
1
1
1
1
Audio 3)
2
2
2
2
2
2
Audio Out 4)
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1
1
1
Speaker output(W)
5W x 2
3W x 2
3W x 2
5W x 2
10W x 2
10W x 2
Power Consumption(W)
In use(Max)
115W
115W
115W
150W
155W
150W
In standby
1W
1W
1W
1W
1W
1W
Dimensions(W/H/D)
(mm)
512 x 475 x 493mm
512 x 475 x 493mm
512 x 475 x 493mm
562 x 466 x 503mm
562 x 466 x 503mm
562 x 466 x 503mm
(in)
20
1/8 x 18 11/16 x 19 7/16
20
1/8 x 18 11/16 x 19 7/16
20
1/8 x 18 11/16 x 19 7/16
22
1/4 x 18 3/8 x 19 7/8
22
1/4 x 18 3/8 x 19 7/8
22
1/4 x 18 3/8 x 19 7/8
Mass
(kg)
24.5kg
24.5kg
24.5kg
27 kg
27 kg
27 kg
(lbs)
54 lbs
54 lbs
54 lbs
59 lbs. 8 oz.
59 lbs. 8 oz.
59 lbs. 8 oz.
-- 3 --
KV-20FS12/20FV12/21FE12/A/C/21FM12/21FV12/C
Section
Title
Page
Warnings and Cautions ............................................................................................................................................................... 4
Self-Diagnostic Function ............................................................................................................................................................. 4
Safety Check-Out Instructions .................................................................................................................................................... 7
1.
GENERAL ........................................................................................................................................................... 8
2.
DISASSEMBLY
2-1.
Rear Cover Removal ..................................................................................................................................................... 13
2-2.
Chassis Assembly Removal ......................................................................................................................................... 13
2-3.
Service Position ............................................................................................................................................................ 13
2-4.
Picture Tube Removal ................................................................................................................................................... 14
3.
SET-UP ADJUSTMENTS
3-1.
Beam Landing ............................................................................................................................................................... 15
3-2.
Convergence ................................................................................................................................................................. 16
3-3.
Focus ............................................................................................................................................................................. 17
3-4.
Screen (G2) ................................................................................................................................................................... 17
3-5.
Method of Setting the Service Adjustment Mode .............................................................................. ........................... 18
3-6.
White Balance Adjustments .......................................................................................................................................... 18
4.
SAFETY RELATED ADJUSTMENTS
4-1.
R562 Confirmation Method (HV Hold-Down Confirmation and Readjustments) .................................................... 19
4-2.
B+ Voltage Confirmation and Adjustment ..................................................................................................................... 19
5.
CIRCUIT ADJUSTMENTS
5-1.
Setting the Service Adjustment Mode .......................................................................................................................... 21
5-2.
Memory Write Confirmation Method ............................................................................................................................. 21
5-3.
Adjustment Buttons and Indicators ............................................................................................................................... 21
5-4.
MB Board Adjustments ................................................................................................................................................. 23
6.
DIAGRAMS
6-1.
Block Diagram ............................................................................................................................................................... 27
6-2.
Circuit Board Location .................................................................................................................................................. 30
6-3.
Printed Wiring Boards and Schematic Diagrams ......................................................................................................... 30
·
A Board .................................................................................................................................................................... 31
·
K Board .................................................................................................................................................................... 38
·
MB Board ................................................................................................................................................................. 39
·
CB Board .................................................................................................................................................................. 47
·
VB Board .................................................................................................................................................................. 49
·
HZ Board .................................................................................................................................................................. 50
6-4.
Semiconductors ............................................................................................................................................................ 51
7.
EXPLODED VIEW
7-1.
Chassis (KV-21FE12/C ONLY) .................................................................................................................................... 52
7-2.
Chassis (KV-21FE12A MODEL ONLY) ......................................................................................................................... 53
7-3.
Chassis (KV-20FV12/21FV12/C ONLY) ....................................................................................................................... 54
7-4.
Chassis (KV-20FS12/21FM12 ONLY) .......................................................................................................................... 55
8.
ELECTRICAL PARTS LIST ................................................................................................................................................. 56
TABLE OF CONTENTS
-- 4 --
KV-20FS12/20FV12/21FE12/A/C/21FM12/21FV12/C
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 AU COUCHE DE CARBONE
PEINTE SUR LE TUBE CATHODIQUE OU AU BLINDAGE DU TUBE
CATHODIQUE.
ATTENTION!!
AFIN D'EVITER TOUT RESQUE 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 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'UNEIMPORTANCE 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.
SELF-DIAGNOSTIC FUNCTION
The units in this manual contain a self-diagnostic function. If an error occurs, the STANDBY/TIMER LED will automatically begin to flash.
The number of times the LED flashes translates to a probable source of the problem. A definition of the STANDBY/TIMER LED flash
indicators is listed in the instruction manual for the user's knowledge and reference. If an error symptom cannot be reproduced, the Remote
Commander can be used to review the failure occurrence data stored in memory to reveal past problems and how often these problems occur.
Diagnostic Test Indicators
When an error occurs, the STANDBY/TIMER LED will flash a set number of times to indicate the possible cause of the problem. If there is
more than one error, the LED will identify the first of the problem areas.
Results for all of the following diagnostic items are displayed on screen. No error has occurred if the screen displays a "0".
Diagnostic Item
Description
No. of Times
STANDBY/TIMER
LED Flashes
Self-Diagnostic Display/
Diagnostic Result
Probable Cause
Location
Detected Symptoms
Power does not turn on
Does not light
· Power cord is not plugged in.
· Fuse is burned out. (F601) (A Board)
· Power does not come on.
· No power is supplied to the TV.
· AC power supply is faulty.
+B overcurrent (OCP)*
2 times
2:0 or 2:1
· H.OUT (Q502) is shorted. (A Board)
· IC702 is shorted. (CB Board)
· Power does not come on.
· Load on power line is shorted.
Vertical deflection stopped*
4 times
4:0 or 4:1
· +12V is not supplied. (A Board)
· IC502 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.
White balance failure
(not balanced)
5 times
5:0 or 5:1
· Video OUT (IC502) is faulty. (A Board)
· IC1301 is faulty. (MB Board)
· Screen (G2) is improperly adjusted.**
· No raster is generated.
· CRT cathode current detection reference
pulse output is small.
* If a +B overcurrent is detected, stoppage of the vertical deflection is detected simultaneously.
The symptom that is diagnosed first by the microcontroller is displayed on the screen.
** Refer to Screen (G2) Adjustments in Section 3-4 of this manual.
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KV-20FS12/20FV12/21FE12/A/C/21FM12/21FV12/C
Display of Standby/Timer LED Flash Count
2 times
4 times
5 times
LED ON 0.3 sec.
LED OFF 0.3 sec.
LED OFF
3 sec.
Diagnostic Item
Flash Count*
+B overcurrent
2 times
Vertical deflection stopped
4 times
White balance failure
5 times
*One flash count is not used for self-diagnostic.
Stopping the Standby/Timer LED Flash
Turn off the power switch on the TV main unit or unplug the power cord from the outlet to stop the STANDBY/TIMER LAMP from flashing.
Self-Diagnostic Screen Display
For errors with symptoms such as "power sometimes shuts off" or "screen sometimes goes out" that cannot be confirmed, it is possible
to bring up past occurrences of failure on the screen for confirmation.
To Bring Up Screen Test
In standby mode, press buttons on the Remote Commander sequentially, in rapid succession, as shown below:
Display
Channel 5
Sound volume
Note that this differs from entering the service mode (sound volume
).
Power ON
+
Self-Diagnostic Screen Display
SELF DIAGNOSTIC
2:
0
3:
N/A
0
4:
0
5:
1
101:
N/A
0
Numeral "0" means that no fault was detected.
Numeral "1" means a fault was detected one time only.
STANDBY/TIMER LED