Beko TELEVISION COLOUR SERVICE MANUAL
CONTENTS PAGE
Safety Instructions 3
Technical Specifications 4
Pin Voltages of IC’s 5
Pin Voltages of Some Transistors 8
Oscillograms 9
Electrical and Service Adjustments 12
Trouble Shooting Guide 16
Parts List 23
Circuit Diagram PIP Module 30
Circuit Diagrams Attached
27/05/2002, Version 2
SAFETY INSTRUCTIONS
GENERAL GUIDELI NES
1. It is advised to insert an isolation transformer
in the AC supply before servicing a hot
chassis.
2. Potentials as high as 33KV are present when
this receiver is in operation. Operation of the
receiver without the rear cover involves the
danger of a shock hazard from t he receiver
power supply. Servicing should not be
attempted by any one who is not
competent with the precautions necessary
when working on the high voltage
equipment. Always discharge the anode of
the tube.
3. When servicing observe the original lead
dress in the high voltage circuits. If a short
circuit is found, replace all the parts which
have been overheated or damaged by the
short circuit.
4. Always use the manufacturer’s replacement
safety components. The critical safety
components marked with
on the
schematics diagrams should not be
replaced by other substitutes. Other
substitute may create the electrical shock,
fire or other hazards. Take attention to
replace the spacers with the originals.
Furthermore where a short circuit has
occurred, replace those components that
indicate evidence of overheating.
5. After servicing, see that all the protective
devices such as insulation barriers, insulation
papers, shields and isolation R-C
combinations are correctly installed.
6. When the receiver is not being used for a
long time of period of time, unplug the
power cord from the AC outlet.
7. After servicing make the following leakage
current checks to prevent the customer
from being exposed to shock hazard.
LEAKAGE CURRENT COLD CHECK
1. Unplug the AC cord and connect a jumper
between the two prongs of the plug.
2. Turn the receiver’s power switch on.
3. Measure the resistance value with an
ohmmeter, between the jumpered AC plug
and each exposed metallic cabinet part on
the receiver, such as screw heads, aerials,
connectors, control shafts etc. When the
exposed metallic part a return path to the
chassis the reading should be between
4Mohm and the 20Mohm. When the
exposed metal does not have a return path
to the chassis, the reading must be infinite.
LEAKAGE CURRENT HOT CHECK
1. Plug the AC cord directly in to the AC
outlet. Do not use an isolation transformer
for this check.
2. Connect a 2Kohm 10W resistor in series with
an exposed metallic part on the receiver
and an earth, such as a water pipe.
3. Use an AC voltmeter with high impedance
to measure the potential across the resistor.
4. Check each exposed metallic part and
check the voltage at the each point.
5. Reverse th e AC plug at the outlet and
repeat each of the above measurements.
6. The potential at the any point should not
exceed 1.4 Vrms. In case a measurement is
outside the limits specified, there is the
possibility of a shock hazard, and the
receiver should be repaired and rechecked
before it is returned to the customer.
HOT CHECK CIRCUIT
TO INSTRUMENTS
EXPOSED
METALLIC PARTS
AC-Voltmeter
Water pipe
(earth)
2 K Ohm
Figure 1
X-RAY RADIATION WARNING
The primary source of X-ray radiation in this receiver
is the picture tube. The chassis is specially
constructed to limit X-ray radiation. For continued
X-ray radiation protection, replace the tube with
the same type of the original one.
CAUTION
AFTER REMOVAL OF THE ANODE CAP, DISCHARGE
THE ANODE OF THE PICTURE TUBE AND THE ANODE
CAP TO THE METAL CHASSIS, CRT SHIELD, OR THE
CARBON PAINTED ON THE CRT WITH A HIGH
VOLTAGE PROBE AND MULTIMETER (SELECT VDC)
AND THEN SHORT CIRCUIT DIRECTLY TO DISCHARGE
COMPLETELY.
TECHNICAL SPECIFICATIONS
Power source: 220-240 VAC, 50-60Hz
Power consumption (max.)
125 W 25”, 28” Mono
145 W 25”, 28” 4/3, 29” Pure Flat
140 W 29” Super Flat
150 W 28” 16/9 Super Flat
155 W 28” 16/9 Pure Flat, 32” Super Flat
165 W 32” Pure Flat
160 W 33”
Standby power consumption : 3 W
Aerial impedance : 75Ohm, coaxial type
2
Receiving system
: PAL BG
PAL SECAM BG
PAL SECAM BG DK
PAL SECAM BG LL’
PAL I
Receiving channels: VHF BAND I , CH2-4
VHF BAND III , CH5-12
CABLE TV S1-41
UHF BAND CH21-69
NTSC Playback Frequencies: 3.58&4.43 MHz
Audio outputs : Stereo : 2 x 10W RMS at %10 THD (Except 21” Pure Flat)
2 x 7W RMS at %10 THD (21” Pure Flat)
+ 20W RMS at %10 THD (if subwoofer available)
Mono : 2 x 7W RMS at %10 THD
High Voltage : 28.5 ± 0.5 KV 25”, 28”4/3
29.0 ± 0.5 KV 28”16/9, 29”, 32” Super Flat
29.5 ± 0.5 KV 32” Pure Flat, 33”
Focus voltage : %25.6 ± %38 of EHT
Grid 2 voltage : 0-1400 V
Heater voltage : 6.2 ± 0.2 Vrms
Video/Audio Terminals : AV1/2 IN Video : 1 Vpp,75 Ohm
Audio : 0.5 Vrms, >10 Kohm
AV1 IN RGB
AV1/2 OUT Video : 1 Vpp, 75 Ohm
Audio : 0.5 Vrms, <1 Kohm
AV2 IN (RCA) Video : 1 Vpp, 75 Ohm
Audio : 0.5 Vrms, >10 Kohm
Operating temperature : 0-45 Degrees
Safety : IEC 65 /BS P2N
X-Ray radiation : ACC. IEC 65/BS P2N
1
: 20W should be added to find the max. power consumption of the models with subwoofer.
2
: TV set is produced to receive “one” of these colour and sound systems.
1
: 120 W 21” Pure Flat
12
IC 301 (MSP 3400G) MULTI STANDARD SOUND PROCESSOR
Pin Connection V DC Pin Connection V DC
1
Not connected
2
Gnd 0
3
Gnd 0
4
Digital control input/output 0
5
Digital control input/output 0
6
Gnd 0
7
Standby (in normal operation it must be high) 4.9
8
Not connected 4.9
9
SCL 2.4-2.6
10
SDA 1.8-2.1
11
Not connected 2.4
12
Not connected 2.4
13
Not connected 2.4
14
Not connected 4.9
15
Not connected 0.7
16
Not connected 0.7
17
ADR Bus Clock Output 0.7
18
Digital Circuitry Supply Voltage 4.9
19
Digital Circuitry Supply Ground 0
20
Not connected 0.7
21
Not connected (Ground) 0
22
Not connected (Ground) 0
23
Not connected (Ground) 0
24
MSP RESET input 4.9
25
Headphone sound output (R) 2.1
26
Headphone sound output (L) 2.1
27
Reference analog ground 0
28
Speaker output (R) 0.1-2.1
29
Speaker output (L) 0.1-2.1
30
Not connected 0.1-2.1
31
Not connected 0.1-2.1
32
Not connected 0
33
Scart 2 sound output (R) 3.7
34
Scart 2 sound output (L) 3.7
35
Reference analog ground 0
36
Scart 1 sound output (R) 3.7
37
Scart 1 sound output (L) 3.7
38
Volume capacitor Headphone
39
Analog Supply High Voltage (8V) 8
40
Volume capacitor Speaker
41
Ground for Analog Power Supply High
42
Internal Analog Reference Voltage 3.7
43
Scart 4 input (L) 3.7
44
Scart 4 input (R) 3.7
45
Analog Shield Ground 0
46
CINCH - sound input (L) 3.7
47
CINCH - sound input (R) 3.7
48
Analog Shield Ground 0
49
Scart 2 sound input (L) 3.7
50
Scart 2 sound input (R) 3.7
51
Analog Shield Ground 0
52
Scart sound 1 input (R) 3.7
53
Scart 1 sound input (L) 3.7
54
A/D converter ref. Voltage 2.5
55
Mono sound input 3.7
56
Ground for Analog Power Supply Voltage 0
57
Analog Power Supply Voltage (5V) 4.9
58
IF input 1 1.5
59
IF Common reference for IF IN1/IN2 1.5
60
IF input 2 0
61
Factory test mode enable (ground) 0
62
Crystal oss. input 2.3
63
Crystal oss. output 2.3
64
Not connected (Ground) 0
0
IC303, IC304 (TDA7263) Audio Output IC
Pin Connection V DC Pin Connection V DC
1
Left In 1.6
2
Left In V 1.6
3
Mute 15.3
4
Right In V 1.6
5
Right In 1.6
6
Gnd 0
7
8
Right out 14.2
9
VS 28
10
Left out 13.9
11
12
Left In 0.6
0,5-0,9
0,5-0,9
IC501 (TDA835X) Vertical Deflection Output IC
Pin Connection V DC Pin Connection V DC
1
Input A 0,98 (0)
2
Input B 0.94 (0)
3
Supply voltage 14,7 (1.0)
4
Output B 7,55 (0,4)
5
Gnd 0 (0)
6
Vertical Flyback Supply Voltage 45,6 (10,9)
7
Output A 7,64 (0,1)
8
Guard Output 0,3 (0)
9
Feedback Input 7,9 (0)
IC601 (MC44608 AP) Power Supply IC
Pin Connection V DC Pin Connection V DC
1
Demag 0.85 (0.0)
2
I sense 0.1 (0.32)
3
Control input 5 (5.5)
4
Gnd 0
(*)
Standby values are given in parenthesis
5
Driver 2.1 (0.14)
6
VCC 12.3 (8.8)
7
Not connected -
8
VI 116 (117)
14
Pin
Standby VDC
TV ON VDC
Standby VDC
TV ON VDC
PIN VOLTAGES OF SOME TRANSISTORS
1. PH601 (PC127FY) PHOTOCOUPLER 2. T603 (BC848) NPN
Standby VDC
1 B C E B C E
2
3
4
3. T604 (BC848) NPN 4. T605 (BC848) NPN
12.5
11.5
5.5
8.8
Standby VDC TV ON VDC Standby VDC TV ON VDC
B C E B C E B C E B C E
ON VDC
11
10
5
12.3
T603
0.6 0.02 0 0.1 0.3 0
T604
5. T606 (BC848) NPN 6. T607 (BC848) NPN
T606
7. T307 (BC848) NPN
T307
0.02 12.7 0 0.7 0.05 0
Standby VDC TV ON VDC Standby VDC TV ON VDC
B C E B C E B C E B C E
0.6 0 0 1 6.8 0
B C E B C E
0.6 0 0 0.1 15 0
T605
T607
0.6 0.02 0 0.1 0.7 0
0.6 0 0 0.1 2.5 0
Note:
TV is connected to a patern generator (Colour bar, sound 1 kHz).
OSCILLOSGRAPHS OF SOME IC PINS
500 mV/div, 20 usn/div, Vpp=1.2 V, 15625 kHz
500 mV/div, 20 usn/div, Vpp=2.1 V, 15625 kHz
500 mV/div, 20 usn/div, Vpp=2.7 V, 15625 kHz
500 mV/div, 20 usn/div, Vpp=2.6 V, 15625 kHz
1. IC101 (TDA956X)
Pin 30
2V/div, 20 usn/div, Vpp=4.9 V, 15625 kHz
Pin 38
2V/div, 20 usn/div, Vpp=2.9 V, 15625 kHz
Pin 31
2V/div, 20 usn/div, Vpp=5.6 V, 15625 kHz
Pin 40
Pin 47
Pin 56 Pin 57
Pin 55
Pin 58 Pin 71
500 mV/div, 20 usn/div, Vpp=2.4 V, 15625 kHz
Pin 72
2 V/div, 1 msn/div, Vpp=5.2 V
2. IC301 (MSP34XX)
2 V/div, 1 msn/div, Vpp=5.2 V
Pin 28
500 mV/div, 1 msn/div, Vpp=1.8 V
3. IC501 (TDA835X)
Pin 1
500 mV/div, 10 msn/div, Vpp=1.4 V, 50Hz
Pin 29
500 mV/div, 1 msn/div, Vpp=1.8 V
Pin 2
500 mV/div, 10 msn/div, Vpp=1.4 V, 50Hz
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