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TC-20KL05P
Contents
Important Safety Notice
Special components are used in this television set which are important for safety. These parts are identified on the schematic
diagram by the symbol . It is essential that these critical parts are replaced with the manufacturer’s specified replacement
parts to prevent X-ray radiation, shock, fire or other hazards. Do not modify the original design without manufacturer’s permission.
!
General Guidelines
An Isolation Transformer should always be used during the servicing
of a receiver whose chassis is not isolated from the AC power line.
Use a transformer of adequate power rating as this protects the
technician from accidents resulting in personal injury from electrical
shocks. It will also protect the Receiver from being damaged by
accidental shorting that may occur during servicing.
When servicing, observe the original lead dress, especially in the high
voltage circuit. Replace all damaged parts (also parts that show signs
of overheating.)
Always Replace Protective Devices, such as fishpaper, isolation
resistors and capacitors, and shields after servicing the Receiver.
Use only manufacturer’s recommended rating for fuses, circuit
breakers, etc.
High potentials are present when this Receiver is operating. Operation
of the Receiver without the rear cover introduces danger from electrical
shock. Servicing should not be performed by anyone who is not
thoroughly familiar with the necessary precautions when servicing
high-voltage equipment.
Extreme care should be practiced when Handling the Picture Tube.
Rough handling may cause it to implode due to atmospheric pressure
(14.7 lbs per sq. in). Do not sick or scratch the glass or subject it to
any undue pressure. When handling, use safety goggles and heavy
gloves for protection. Discharge the picture tube by shorting the anode
to chassis ground (not to the cabinet or to other mounting hardware).
When discharging, connect cold ground (i.e. dag ground lead) to the
anode with a well insulated wire or use a grounding probe.
Avoid prolonged exposure at close range to unshielded areas of the
picture tube to prevent exposure to X-ray radiation.
The Test Picture Tube used for servicing the chassis at the bench
should incorporate safety glass and magnetic shielding. The safety
glass provides shielding for the tube viewing area against X-ray radiation
as well as implosion. The magnetic shield limits X-ray radiation around
the bell of the picture tube in addition to restricting magnetic effects.
When using a picture tube test jig for service, ensure that the jig is
capable of handling 31kV without causing X-ray radiation.
Before returning a serviced receiver to the owner, the service
technician must thoroughly test the unit to ensure that is completely
safe to operate. Do not use a line isolation transformer when testing.
Warning !
It is essential that these critical parts are replaced
with the manufacturer’s specified replacement parts
to prevent X-ray radiation, shock, fire or other haz-
ards.
!
ABOUT LEAD FREE SOLDER (PBF) ........................................................ 3
SUGGESTED PBF SOLDER .................................................................... 3
HOW TO RECOGNIZE THAT PB FREE SOLDER IS USED ......................... 3
IC601 - PINOUT ...................................................................................... 5
IC601 - PINOUT ....................................................................................... 6
IC VOLTAGE TABLES ............................................................................. 6
IC601 - BLOCK DIAGRAM ...................................................................... 7
GP31 CHASSIS FEATURE SUMMARY .................................................... 8
DAC CONTROL FOR GP31 CHASSIS FUNCTIONS AND ADJUSTMENTS ......... 9
HOW TO RESET THE UNIT (SELF CHECK) ............................................... 9
HOW TO ENTER IN THE SERVICE MODE ................................................. 9
CHK1 MODE - OPTIONS ......................................................................... 9
ADJUSTMENTS ....................................................................................... 10
CHK2 MODE - VCJ ADJUSTMENTS ....................................................... 10
CHK3 MODE - PINCUSHION ADJUSTMENTS ......................................... 10
EEPROM MEMORY MAPS ...................................................................... 11
ADJUSTMENTS ....................................................................................... 13
CRT P.C.B. .............................................................................................. 18
SCHEMATICS DIAGRAMS ....................................................................... 18
SHEMATIC DIAGRAM P.C.B. ................................................................... 19
MAIN P.C.B. ............................................................................................. 20
SIGNAL WAVEFORM .............................................................................. 21
EXPLODED VIEW .................................................................................... 25
REPLACEMENT MECHANICAL PARTS LIST .......................................... 26
REPLACEMENT ELECTRICAL PARTS LIST ............................................ 27
Summary of Contents for TC-20KL05P
Page 18: ... 18 TC 20KL05P SCHEMATICS DIAGRAMS CRT P C B ...
Page 19: ...TC 20KL05P P C B SHEMATIC DIAGRAM TC 20KL05P 19 ...
Page 22: ... 22 TC 20KL05P Pino 42 Pino 55 IC601 Pino 18 Pino 19 Pino 38 Pino 40 ...
Page 23: ... 23 TC 20KL05P Pino 64 IC601 Pino 56 Pino 57 Pino 58 Pino 63 ...
Page 24: ... 24 TC 20KL05P Pino 1 IC801 Base Q501 Coletor Coletor Q551 Emissor Q601 Coletor Q602 ...
