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TC-21FX30LA/LP / TC-29FX30LA/LP
Special components are used in this television set which are important for safety. These parts are identified on the schematic
diagram by the symbol
!
parts to prevent X-ray radiation, shock, fire or other hazards. Do not modify the original design without manufacturer's permission.
Contents
ABOUT LEAD FREE SOLDER (PbF) ............................................ 3
SUGGEST PbF SOLDER ............................................................... 3
SAFETY PRECAUTIONS ................................................................ 4
GP41 CHASSIS FEATURE SUMMARY ......................................... 5
IC601 - BLOCK DIAGRAM .............................................................. 6
IC601 - PINS DESCRIPTION ........................................................ 6
VOLTAGE TABLES ........................................................................... 8
GP41 CHASSIS BLOCK DIAGRAM ............................................... 9
SERVICE HINTS .............................................................................. 10
FACTORY MODE ADJUSTMENT ................................................... 10
HOW TO ACCESS THE MEMORY MAPS ................................... 12
COLOUR PURITY AND CONVERGENCE ADJUSTMENT ....... 20
CRT VRS ADJUSTMENT ................................................................ 22
RF AGC ADJUSTMENT ................................................................... 23
VIF DETECTOR OUTPUT LEVEL CONFIRMATION .................. 23
BUZZING CONFIRMATION (AUDIO CIRCUIT) ........................... 23
ANODE AND HEATER VOLTAGE CONFIRMATION ................... 23
PAL COLOR OUTPUT SIGNAL ADJUSTMENT ......................... 24
NTSC SUB-TINT CALIBRATION ................................................... 24
PROTECTION CIRCUIT (SHUTDOWN) ...................................... 24
CONFIRMATION OF OPERATION ................................................. 24
SUB-BRIGHT AND SUB-CONTRAST CALIBRATION ................ 25
FOCUS CALIBRATION .................................................................... 25
PURITY CALIBRATION .................................................................. 25
WHITE QUALITY CALIBRATION .................................................... 26
CRT CUT OFF VOLTAGE ADJUST .............................................. 26
WHITE BALANCE CALIBRATION .................................................. 26
DEFLECTION CALIBRATION AND CONFIRMATION ................. 27
MAIN BOARD CIRCUIT LAYOUT .................................................. 29
"L" BOARD SCHEMATIC DIAGRAM (TC-21FX30LA / LP) ......... 30
"L" BOARD SCHEMATIC DIAGRAM (TC-29FX30LA / LP) ......... 31
"G" BOARD SCHEMATIC DIAGRAM (TC-29FX30LA / LP) ........ 32
"A" BOARD SCHEMATIC DIAGRAM (TC-21FX30LA / LP) ......... 33
"A" BOARD SCHEMATIC DIAGRAM (TC-29FX30LA / LP) ......... 34
WAVEFORM CHART ........................................................................ 35
EXPLODED VIEW ............................................................................ 38
MECHANICAL PARTS LIST ........................................................... 39
ELECTRICAL PARTS LIST (TC-21FX30LA/LP) ......................... 40
ELECTRICAL PARTS LIST (TC-29FX30LA/LP) ......................... 44
Important Safety Notice
. It is essential that these critical parts are replaced with the manufacturer's specified replacement
General Guidelines
An Insulation Transformer should always be used during the
servicing of a receiver whose chassis is not insulated from the
AC power line. Use a transformer with adequate power rating
as its 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,
insulation 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
it, 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 insulation
transformer when testing.
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.
- 2 -
Warning !
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