Teac CT M203 Service Manual

Page 1

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A.C.N. 663 086 98

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Color Television
SERVICE MANUAL

Thanks for buying a TEAC. Read this manual carefully to get the best performance from this color television.

» This appliance has a serial number located
. on the rear panel. Please record the model

number and serial number and retain them for
your records.

Model number

Serial number

WARNING: TO PREVENT FIRE 0R SHOCK
HAZARD, DO NOT EXPOSE THIS
APPLIANCE T0 RAIN 0R MOISTURE.

Page 2

Contents and Specifications .............................................................

Safety Precautions ......
Servicing Precautions ..
Controls Location ...........
Disassembiy instructions .

Parts Location Diagram of Main Chasers

Adjustment instructions ,.
Circuit Description
Troubleshooting Guide
Block Diagram
Wiring Diagram

Terminal View of Semiconductor ..

Component Location Guide
Printed Circuit Board
Exploded View
Replacement Parts List
Circuit Diagram ..

CONTENTS

SPECIFICATIONS

Power Consumption .....
Receiving TV System
Tuning .............
Audio Output ..

...... 80W
CCIR Standard

.. 40 Voltage Synthesizer

......................... 3W

Antenna input impedance ................................................................. 75 ohm IEC Type
(SOC-ohm using balun supplied)

Picture Tube
Dimension

......... A48KCS12XX 033735
. 492(w) x 462(D) x 458(H)

Weight 18.4 Kg

COLOUR RECEIVING SYSTEM PAL/SECAM-B/G PAL B/G- PAL-l PAL-H
SECAM D/K

Intermediate _ - new?" §§~9MH_2_- - _3§_9_Ml'tz__ _ 39.52 W}. 38 9_ 1.462.-
Frequency _ ___ _S_o_u_n_d__ _ _ __ _§:§.§_Ml_-l_z _____ g3_.4_llfll-l:_ _ _3_3_5_M_H3_ _ §3_.4_NlH} _
Colour 34.47 MHz 34.47 MHz 35.07 MHz 34.47 MHz

Receiving _ VHF Low 2-4_QH,_S1___ _ __1:5_<_3H__ _ .N_Ot:l§___ _ _0-_5_C_H_ _
Channel _____________ _ . £Hv§3§2i _ _ 5-12.91 _ _ .,N9_N_E_ _ _ 556:11031

UHF 21 -69 CH 21 -69 CH 21 -69 CH 21 -69 CH

Power Source

220Vl50H z (SM PS)

240V/50Hz (SMPS)

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3) A80 (40.4 MHz) Alignment (L161)

a) This alignment is only applicable to the model with ASC
TRAP for FTZ.

b) The connection of alignment is the same as figure 1 but
connect RF OUT of the SWEEP GENERATOR to
TURNER lF OUTPUT terminal of Main PCB.

c) Turn L161 counterclockwise so that CORE may be ap-
peared to maximum and then adjust it clockwise.

d) After setting output of SWEEP GENERATOR to max
imum, in crease IF AGC voltage of pin 4 (IC101 ) about
5V so that waveform may be distinguished the variation
of L161 in the saturated state.

e) Adjust L161 so that40.4MHz POINT may be maximum.

3-2 AFT ALIGNMENT (L102)

NOTE) Cut the SLIT part of the C106(+) before adjusting.

1) The connecting of equipments is the same procedure as
that above b) item. but the connection position of Alignment
Scope must be changed from output terminal of 2102 to
pin 12 of IC101,

2) Set VERTICAL GAIN of SCOPE to 1Vp-p/dIV and set the
SWEEP GENERATOR output to a low state possibly.

3) Adjust L102 so that it may be the same as shown in figure 3.

PICTURE CARRIER

Figure 3 (AFT Alignment Waveform)
4) After finishing the adjustment, connect SLIT of the C106(+ ).

3-3 MAIN B+(112V or 118V DC) ALIGNMENT

1) Turn on the TV set.

2) Receive the standard colour signal. (digital pattern)

3) Set the portion of colour, Bright, Contrast to the maximum.

4) Adjust VR801 so that the voltage of J122(TP6) may be 112V
for the model smaller than 21 and 118V for 21 model.

3-4 HORIZONTAL SYNOHRONIZATION ALIGNMENT

1) Receive the standard color signal on the TUNER
ANTENNA.

2) Connect SYNC. SEPARATOR INPUT SIGNAL to the
Ground.
(Connect pin11 oflC401 to the GND...J110,J111,TP3 part)

3) Adjust VR401 so that the screen may be maintained the
synchronization in a horizontal and vertical direction.

4) Remove the connection of pin 11 of |C401 from GROUND.

3-5 HORIZONTAL CENTER ALIGNMENT (HOR.SHIFT
ALIGNMENT)

1) Receive the standard colour signal.

2) Adjust the VR402 so that the screen may be the Geometric
center.

3-6 VERTICAL OSCILLATOR FREQUENCY ALIGNMENT

1) Adjust the set in no signal condition.
2) Connect the frequency COUNTER to the CONNECTOR
part (R304) which is connected with vertical DY.

(Connect the (- ) side of the connector to the heat sink of
the chassis)

3) Adjust VR302 so that FREE-RUN frequency may be
46.00 i 0.5Hz,

3-7 VERTICAL AMPLITUDE AND LINEARITY ALIGNMENT
(VERT. HEIGHT AND LINEARITY ALIGNMENT)

1) When brightness of a screen is minimum as receiving the
FuBK TEST PATTERN, adjust VR301 so that the outline
signal of the upper and lower parts of the great circle on
screen may be coincide with the edge of a effective screen.

2) After changing the signal to Digital, adjust VR303 so that
the length of upper and lower of the great circle may be
equaL

3-8 VERTIICAL CENTER ALIGNMENT
Adjust SW801 (Vertical Center SVC.S/W)so that CENTER of

PATTERN may coincide with the Geometric center of an ef- I

fective CPT screen.

3-9 COLOUR SYNCHRONIZATION ALIGNMENT

1) Receive the standard colour signal.

2) Set the Contrast, Brightness, Colour VR to maximum.

3) Connect the COLOUR SATURATION terminal to 12V.

4) Short the INPUT pin 21 (B-Y), PIN 22 (R-Y) of the IC501.

5) Adjust the PTCSO1 (TRIMMER CAPACITOR) so that COL-
OUR BAR should not flow down.

6) After finishing adjustment, remove the connection of item
3) and 4).

3-10 PAL MATRIX ALIGNMENT

1) Set the Contrast, Brightness, Colour Control VR to the
maximum. .

2) Receive the DEM. PATTERN (Colourless Pattern).

3) Connect the SCOPE to the BOUT (Pin 16 of PICSO1).

4) Adjust PVR501 to obtain a minimum fluctuation (A straight
line) in figure 4-1.

FLUCTUATION

T

l_ _J

Figure 4-1. PVR501 Alignment

5) After changing the PATTERN into the PAL COLOUR BAR
signal, adjust PL504 so that the fluctuation may be minimum
and a straight line as shown in figure 42.

Figure 4-2. PL504 Alignment

6) Repeat the adjustment of the above items 4), 5)again by
varing the pattern and then confirm.