KV-25FS12 - Sony TV Service Manual (repair manual)

kv-25fs12 service manual
Model
KV-25FS12
Pages
91
Size
12.99 MB
Type
PDF
Document
Service Manual
Brand
Device
TV
File
kv-25fs12.pdf
Date

Read Sony KV-25FS12 Service Manual online

TRINITRON
®
 COLOR TELEVISION
  SERVICE MANUAL      
 
  
BA-5
 
CHASSIS
        MODEL NAME 
REMOTE COMMANDER 
DESTINATION  
CHASSIS NO. 
KV-25FS12
9-965-902-01
KV-25FS12
 
RM-Y173 
SCC-S38UA
KV-25FS12C
 
RM-Y173 
SCC-S38VA
RM-Y173
— 2 —
KV-25FS12 / 25FS12C
TABLE OF CONTENTS
 
Specifi cations.......................................................................................................................................3
 
Warnings and Cautions........................................................................................................................4
 
Safety Check-out .................................................................................................................................5
 
Self-Diagnostic Function......................................................................................................................6
1. Disassembly
 
1-1. Rear Cover Removal.....................................................................................................................8
 
1-2. Chassis Assembly Removal..........................................................................................................8
 
1-3. Service Position ............................................................................................................................8
 
1-4. Picture Tube Removal ...................................................................................................................9
 
 
Anode Cap Removal Procedure...................................................................................................9
2. Set-up Adjustments
 
2-1. Beam Landing...............................................................................................................................10
 
2-2. Convergence.................................................................................................................................11
 
2-3. Focus ............................................................................................................................................12
 
2-4. Screen (G2) ..................................................................................................................................12
 
2-5. Method of Setting the Service Adjustment Mode..........................................................................13
 
2-6. White Balance Adjustments ..........................................................................................................13
3. Safety Related Adjustments
 
3-1. X R564 Confi rmation Method (HV Hold Down Confi rmation) and Readjustments.....................14
 
3-2. B+ Voltage Confi rmation and Adjustment .....................................................................................14
4. Circuit Adjustments
 
4-1. Setting the Service Adjustment Mode...........................................................................................16
 
4-2. Memory Write Confi rmation Method .............................................................................................16
 
4-3. Remote Adjustment Buttons and Indicators .................................................................................16
 
 
Adjustment Items..........................................................................................................................17
 
4-4. MB Board Adjustments .................................................................................................................19
5. Diagrams
 
5-1. Circuit Boards Location.................................................................................................................21
 
5-2. Printed Wiring Boards and Schematic Diagrams..........................................................................21 
 
5-3. Block Diagram...............................................................................................................................22
 
 
A Board ........................................................................................................................................24
 
 
CB Board......................................................................................................................................28
 
 
K Board ........................................................................................................................................30
 
 
MB Board .....................................................................................................................................31
 
 
VB Board ......................................................................................................................................35
 
5-4. Semiconductors ............................................................................................................................36
6. Exploded Views
 
6-1. Chassis .........................................................................................................................................37
 
7. Electrical Parts List ......................................................................................................................................38
     SECTION TITLE 
PAGE
— 3 —
KV-25FS12 / 25FS12C
Television system
NTSC
Channel coverage
VHF: 2-13/ VHF: 14-69/ CATV: 1-125
Picture tube
Flat Trinitron
®
 tube
Visible screen size
25-inch picture measured diagonally
Actual screen size
27-inch measured diagonally
Antenna
75 ohm external terminal for VHF/UHF
Supplied Accessories
Remote Commander RM-Y173
Size AA (R6) batteries (2)
Dipole Antenna
Optional Assessories
Connecting cables: VMC-810S/820S, VMC-720M,
YC-15V/30V, RK74A
U/V mixer EAC-66
SPECIFICATIONS
Design and specifi cations are subject to change without notice.
1)   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)   500 mVrms (100% modulation), Impedance:  47 kilohms
4)   More than 408 mVrms at the maximum volume setting (variable)
 
More than 408 mVrms (fi x); Impedance (output): 2 kilohms
KV-25FS12
KV-25FS12C
Power requirements
120V, 60Hz
220V, 50/60Hz
Number of Inputs/Outputs
Video 
1)
2
S Video 
2)
1
Audio 
3)
2
Audio Out 
4)
1
Headphone Out
Speaker output (W)
7.5 x 2
Power Consumption (W)
In use (Max)
165W
In Standby
1W
Dimensions(W/H/D)
mm
614.8 x 564.1 x 499.7
in
24 
13
/
64
 x 22 
13
/
64
 x 19 
49
/
64
Mass
kg
36 kg
lbs
79 lbs 6 oz.
1
— 4 —
KV-25FS12 / 25FS12C
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 identifi ed 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 identifi ed 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.
Afi n 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 identifi es 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 identifi es dans le present manuel. Suivre ces procedures lors de 
chaque remplacement de composants critiques, ou lorsqu’un mauvais fonctionnement suspecte.
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Here you can read online and download Sony KV-25FS12 Service Manual in PDF. KV-25FS12 service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sony KV-25FS12 TV. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.