File name tv PF29T18, CPF29T99, PF34T18 Ch. CH-20.pdf
FILE NO. SM-CTV-O-123
MODEL NO. PF29T18/34T18
CHASSIS NO. CH-20
Please read this manual carefully before service.
TABLE OF CONTENTS
ADJUSTMENTS ... 4
STRUCTURE AND CHASSIS FUNCTION DESCRIPTION ... 17
SERVICE DATA ... 17
REPLACEMENT OF PARTS... 55
APPENDIX 1. CIRCUIT DIAGRAMS
2. PRINTED CIRCUIT BOARD LAYOUTS
3. FINAL ASSEMBLY DIAGRAMS
4. FINAL WIRING DIAGRAMS
INSTRUCTIONS FOR SERVICE SAFETY AND MAINTENANCE
WARNING: BEFORE SERVICING THIS CHASSIS, READ THE ˇ° X-RAY
RADIATION PRECAUTIONˇ± , ˇ° SAFETY PRECAUTIONˇ± AND ˇ° PRODUCT
SAFETY NOTICEˇ± INSTRUCTION BELOW.
X-RAY RADIATION PRECAUTION
1. The EHT must be checked every time the TV is serviced to ensure that the CRT does not emit
X-ray radiation as result of excessive EHT voltage. The maximum EHT voltage permissible in
any operating circumstances must not exceed the rated value. When checking the EHT, use
the High Voltage Check procedure in this manual using an accurate EHT voltmeter.
2. The only source of X-RAY radiation in this TV is the CRT. The TV minimizes X-RAY radiation,
which ensures safety during normal operation. To prevent X-ray radiation, the replacement
CRT must be identical to the original fitted as specified in the parts list.
3. Some components used in this TV have safety related characteristics preventing the CRT from
emitting X-ray radiation. For continued safety, replacement component should be made after
referring the PRODUCT SAFETY NOTICE below.
4. Service and adjustment of the TV may result in changes in the nominal EHT voltage of the
CRT anode. So ensure that the maximum EHT voltage does not exceed the rated value after
service and adjustment.
WARNING: REFER SERVICING TO QUALIFIED SERVICE PERSONNEL ONLY.
1. The TV has a nominal working EHT voltage. Extreme caution should be exercised when
working on the TV with the back removed.
1.1 Do not attempt to service this TV if you are not conversant with the precautions and procedures
for working on high voltage equipment.
1.2 When handling or working on the CRT, always discharge the anode to the TV chassis before
removing the anode cap in case of electric shock.
1.3 The CRT, if broken, will violently expel glass fragments. Use shatterproof goggles and take
extreme care while handling.
1.4 Do not hold the CRT by the neck as