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SERVICE MANUAL
Color Television Receiver
Model: KDT143AST
SPECIFICATION
1
SPICIFICATION
System TV PAL D/K, B/G, I
SECAM D/K, B/G, L
AV PAL 50/60
SECAM 50
NTSC 4.43/3.58MHz
Channel VHF-Low 49.75MHz~160.25MHz
VHF-High: 168.25MHz~456.25MHz
UHF: 471.25MHz~863.25M
Scanning Line 625/525 Line
Horizontal Frequency 15625/15750 Hz
Vertical 50/60 Hz
IF Frequency Video 38.9MHz
Sound 32.4/32.9/33.4 MHz
Chroma 34.47 MHz
34.4 MHz(SECAM)
34.65 MHz(SECAM)
Sensitivity VHF LOW 48 dBV
VHF HIGH 48 dBV
UHF 51 dBV
Audio Output Power 7% THD 1.5W + 1.5W
Antenna Impedance 75
Power Consumption 75W
Power Supply AC 220-240V 50/60Hz
2
IMPORTANT SERVICE SAFETY INFORMATION
Operating the receiver outside of its cabinet or with its back removed involves a shock hazard. Work on
these models should only be performed by those who are thoroughly familiar with precautions necessary when
working on high voltage equipment.
Exercise care when servicing this chassis with power applied. Many B plus and high voltage RF terminals
are exposed which, if carelessly contacted, can cause serious shock or result in damage to the chassis. Maintain
interconnecting ground lead connections between chassis, escutcheon, picture tube dag and tuner when operating
chassis.
These receivers have a "polarized" AC line cord. The AC plug is designed to fit into standard AC outlets in
one direction only. The wide blade connects to the 'ground side' and the narrow blade connects to the 'hot side' of
the AC line. This assures that the TV receiver is properly grounded to the house wiring. If an extension cord must
be used, make sure it is of the 'polarized' type.
Since the chassis of this receiver is connected to one side of the AC supply during operation, service should
not be attempted by anyone not familiar with the precautions necessary when working on these types of
equipment.
When it is necessary to make measurements or tests with AC power applied to the receiver chassis, an
Isolation Transformer must be used as a safety precaution and to prevent possible damage to transistors. The
Isolation Transformer should be connected between the TV line cord plug and the AC power outlet.
Certain HV failures can increase X-ray radiation. Receivers should not be operated with HV levels
exceeding the specified rating for their chassis type. The maximum operating HV specified for the chassis used in
these receivers is 27kV