Teac CT M215 Service Manual

Page 1

TEAC®

CT-M215

CT-M145

Color Television
SERVICE MANUAL

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

This aopliance has a serral number located

. on me 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 NUT EXPOSE THIS
APPLIANCE TD RAIN 0R MOISTURE.

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CONTENTS

Contents and Specifications .............
Safety Precautions...

Servicing Precautions ..
Controls Location ..............
Disassembly Instructions ......
Parts Location Diagram of Main Chassis
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 .

SPECIFICATIONS
Power Consumption ................................................................................................................................................ 21"(85W), 14"(70W)
Receiving TV System.. ............. CCIR Standard
Tuning .......................... 40 Voltage Synthesizer
Audio Output .......................................... 3W

75 ohm IEC Type
(300-ohm using baiun supplied)

Antenna input Impedance

Picture Tube ............................................................................................................................. (21") A51EBV13X25 (VIDEO-COLOR)
(14")A34KC012XX 0237BD
Dimension . ........................................................................................................ 14": 360(W) x 370(0) x 349(H) mm
21": 512(WI x 474.4(D) x 475(H) mm
Weight . ....... (14") 10,4 Kg
(21") 21.7 Kg
C L R EIVING SYSTEM PAL B/G7 PAL-H
0 0U REC PAL/SECAM-B/G SECAM WK PAL-I
"£1019?".,,,____3§;9M'12______-,.,3§9Mt'é,,_ 99.5%. _____ §§-?_Mtl.z___
Intermediate Sound 33.4 MHz 33.4 MHZ 33.5 MHz 33.4 MHz
Frequency 7777c7c3l7o7u?7 7 7 7 7 7 7 737474777 Mlii 77777 7 7 7374177 Nil-ii 77 7 7§§,7()777I\7/II7-I7z77 7 773.1177 7M7Hz7 77
VHF Low 2-4 CH, S1-Sz
Receiving 7 VHF High 5-12 CH, 52-st
Channe' 7 77 UHF 21-89 CH
Power Source 220V/50Hz (SMPS) 240V/50Hz (SMPS)

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5. CHROMA 8: LUMINANCE CIRCUIT (PICSM, TDA3560A)

58 DLSOI Pnsii PL504 em a-ouT Gm
___I O
PL503
PRSlO
R222 can c210 Zl
piece
PVR 501 LT
28 Fllzzlzsliz; T i 2. more Lfei's
CHROMA 8-8 MHZ APC R-V B ] I n l a-our
OUT 0 s c DET l DEM) i MATRIX MAT
G r B-Y L G
DEMO DEMO MATRIX
HEW: fl l BRIGHT
P AK
SKIS? DST snort/m: IEEZRCATEI Y- Awl R- OUT Ifl'G-OUj
l . Ulllu
4 5 If}; 7 l3 l4
FREQ c507 c209
Ylmw Jews 0 l
CHROMA mpcsos PRSOZ PC504 COLORCOMRSTSS COAT s/w PCSIZl RZZl
SIGNALH Raiz DLZOl R214
PCSOB o
507 P150!
1% l LUMINANCE BRtGHT R- our RiN G-OUT
' SIGNAL

Figure 15. Schematic Diag

5-1 Chroma Path
First, the chroma signal flows from B.P.F circuit into pin3
to be amplified, and then it flows into the second amplifier
to be about 4Vp«p.
The amplifier signal output from pin28 is separated into
two ways.
One flows through PR510, PC518 into 1HDelay
Line(DL501), the other flows through PH509, PVR501 and
P0517 into mid-tap ot PL504.
At PL504 two kinds of signal are vectored and adjusted,
so that R-Y(u)signa| is separated into B-Ylu) and B-Y(v).
Each of the signats is demodulated inside pinsz1, 22. so
that G-Y is generated by Ft-Y and B-Y.
In the course of demodulation, coloursystem is a carrier
wave suppressed. Theretore pin525,25 oscillate to
8.86MHz to reconstitute a carrier wave.
The DC voltage the colour Burst of pin523,24 generates
flows into oscillatorfor 8.86MHz and adjust the oscillating
frequency and the false image so that they may concide
with original signal.
After 8.86MH2 generated in this way decrease by half,
RAY and B-Y flow into G-Y demodulator in order to
generate a complete demodulation.

ram of P|0501 (TDA3560A)

On the other hand, pin2 discharges its duty of controlling
the first amplifier of an outcome so that colour killer should
not generate colour noise during receiving black and white
signal or electric field less than 35dBm.
That is to say, pin4 detects the colour Burst and makes
it generate DC voltage. which is supplied and controlled
on pin2, and kills the DC voltage of pin2 less than 3V.
Pine is a saturation control circuit.

5-2 Luminance Path
As much as chroma path needs to perform chroma signal.
DL201 delays Luminance signal about Scans, and then
this flows into pinto through P0512 and control contrast,
brightness with pin? and pin11 to be supplied for each of
R.G.B matrix circuit luminance signal supplied on pin10
is commonly 0.5Vp-p.

5-3 R.G.B Data Input
When the DC voltage of pin9 is 1-3V. PICSO1 is converted
into it in data input and when each of FLGB signals flows
into pins 13,15,17 each signal is in outputat pins 12,14,16.
in case that DC voltage of pin9 remains less than 0.4V,
normal state remains.

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