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Colour Television
Service Manual
28M1 MKII
Service Ref. No. 28M1 MKII-00
PRODUCT CODE: 1 I 13 1691 I
ORIGINAL VERSION:
25M1 MKII
Service Ref. No. 25M1 MKII-00
Service Ref. No. 25M1 MKII-01
PRODUCT CODE: 1113
ORIGINAL VERSION: Chassis No. EB4-A
Give complete "SERVICE REF. NO." for parts order or
servicing, it is shown on the rating sheet on the
cabinet back of the TV set.
Note
This TV receiver will not work properly in foreign
countries where the television transmission system
and power source differ from the design specifications.
Refer to the specifications for the design specifications
Part No. SKSMO156
E6MM/LM
Chassis No. EB4-A
16811
Common Specifications
Power source
Television system
Colour system
Receiving channel
Aerial input impedance 750hm
AV terminal
21 Pin sockets
28M1 MKII Specifications
Sound output
Picture tube
(Visible picture diagonal) 66cm
Dimensions (WxHxD)
Weight
25M1 MKII Specifications
Sound output
Picture tube
(Visible picture diagonal) 59cm
Dimensions (WxHxD)
Weight
AC 220~240V 50Hz
System I
PAL
UHF 21-69
CENELEC standard
5 watts X2
70cm diagonal, 110 degree
736 x 578 x 493mm
31 Kg
5 watts X2
63cm diagonal, 110 degree
676 x 526 x 446mm
27 Kg
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Summary of Contents for Matsui 28M1 MKII
- Page 1 Colour Television Service Manual 28M1 MKII Service Ref. No. 28M1 MKII-00 PRODUCT CODE: 1 I 13 1691 I ORIGINAL VERSION: Chassis No. EB4-A 25M1 MKII Service Ref. No. 25M1 MKII-00 Service Ref. No. 25M1 MKII-01 PRODUCT CODE: 1113 16811 Common Specifications ORIGINAL VERSION: Chassis No.
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Page 3: Circuit Description
CIRCUIT DESCRIPTION 1. POWER SUPPLY control) The chroma signal is divided into R-Y and B-Y The power supply circuit of the EB4-A chassis is chroma signals, demodulated in IC201, and output from composed of a rectifier smoothing circuit, an oscillation pin30 (R-Y) and pin31 (B-Y). -
Page 4: Horizontal Output
6. HORIZONTAL OUTPUT Pin25: Black A horizontal oscillation signal is output from pin37 of Pin26: IREF IC201 and switches the drive transistor Q431. This Pin27: Odd/Even output switching signal is current amplified by the drive Pin28: GND transformer T431 and drives the output transistor Q432. Pin29: - When Q432 becomes ON, an amplifying current flows Pin30: V-deflection stop output... - Page 6 HIGH VOLTAGE &WIDTH ADJUSTMENT B1 POWER SUPPLY ADJUSTMENT [HIGH VOLTAGE ADJUSTMENT] 1. Set VR641 to it’s mechanical centre before pressing the mains switch. 1. Tune the receiver to circular pattern. 2. Set the brightness and contrast controls to maximum. 2. Tune the receiver to a PAL circular pattern. 3.
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Page 7: Circuit Alignment
CIRCUIT ALIGNMENT Input probe VIF alignment SETTING Adjustment Waveform DC 15.5V C644 + By using T141, adjust “P” to AGC voltage (4.3-4.5V) IC201 -pin48 be maximum amplitude. Output probe IC201 -pin45 (Side b) Input probe IC201 -pin7 Marker frequency 39.5MHz Sweep ATT 20dB 0dB=176mVrms/75... - Page 8 INITIALISATION (Important Notice) When you replace a memory IC (IC802), it is Service mode description K1, K2 : For adjustment of stereo separation necessary to initialise the IC as following step. ST ID : Mode setting for A2 stereo judgement A.