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FILE NO. SM-CTV-O-155
COLOR TELEVISION
SERVICE MANUAL
MODELNO. 21BM91
CHASSIS NO. CN-18EA (V2)
Please read this manual carefully before service.
TABLE OF CONTENTS
SPECIFICATIONS............................................................................................................ 1
SAFETY INSTRUCTIONS AND MAINTENANCE ....................................... 2
X-RAY RADIATION PRECAUTION......................................................................................... 2
SAFETY PRECAUTION .......................................................................................................... 2
PRODUCT SAFETY NOTICE.................................................................................................. 3
SAFETY SYMBOL DESCRIPTION ......................................................................................... 4
MAINTENANCE....................................................................................................................... 4
ADJUSTMENTS ................................................................................................................ 5
SET-UP ADJUSTMENTS ........................................................................................................ 5
CIRCUIT ADJUSTMENTS....................................................................................................... 8
STRUCTURE AND CHASSIS FUNCTION DESCRIPTION................. 24
STRUCTURE BLOCK DIAGRAM ......................................................................................... 24
BLOCK DIAGRAM FOR SUPPLY VOLTAGE SYSTEM ....................................................... 25
CHASSIS DESCRIPTION ..................................................................................................... 26
SERVICE DATA ............................................................................................................... 27
TECHNICAL DATA OF KEY ICS .......................................................................................... 27
SERVICE DATA OF KEY ICS ............................................................................................... 51
REPLACEMENT OF PARTS................................................................................... 58
APPENDIX
1. CIRCUIT DIAGRAM
2. FINAL ASSEMBLY DIAGRAMS
3. FIND WIRING DIAGRAMS
4. PRINTED CIRCUIT BOARD LAYOUTS
SERVICE MANUAL
SPECIFICATIONS
Table 1 Specifications
Model Number 21BM91
Color
PAL, NTSC3.58, NTSC4.43, SECAM
system
RF system
Sound
B/G, D/K, I, M
system
Video system PAL4.43, NTSC3.58, NTSC4.43, SECAM (50/60Hz)
Channels preset 236 (0-235)
Antenna input 75 (unbalanced)
Picture tube
Effective screen dimensions 406 305mm
(Approx.)
Audio output
3W+3W
(THD 7%)
Power source 220V ~, 50Hz
Weight (Approx.) 22kg
Dimensions
590 451 475mm
(W H D) (Approx.)
Rated power consumption
87W
(220V ~, 50Hz)
Designs and specifications are subject to change without notice.
1
SERVICE MANUAL
SAFETY INSTRUCTIONS AND MAINTENANCE
WARNING: BEFORE SERVICING THIS CHASSIS, READ THE