Konka K2005UM User manual
SERVICE MANUAL
Model:
K2005UM
Safety Instructions
Features & Specifications
Block Diagram
Circuit Diagram
Disassembly
Pin Descriptions
Exploded View Diagram
Bill of Material
SafetyInstructions
PRECAUTIONS DURING SERVICING
1. In addition to safety, other parts and
assemblies are specified for conformance with
such regulations as those applying to spurious
radiation. These must also be replaced only
with specified replacements.Examples: RF
converters, tuner units, antenna selection
switches, RF cables,noise-blocking capacitors,
noise-blocking filters, etc.
2. Use specified internal Wiring. Note
especially:
1) Wires covered with PVC tubing
2) Double insulated wires
3) High voltage leads
3. Use specified insulating materials for
hazardous live parts. Note especially:
1) Insulating Tape
2) PVC tubing
3) Spacers (insulating barriers)
4) Insulating sheets for transistors
5) Plastic screws for fixing micro switches
4. When replacing AC primary side
components (transformers, power cords, noise
blocking capacitors, etc.), wrap ends of wires
securely about the terminals before soldering.
5. Make sure that wires do not contact heat
generating parts (heat sinks, oxide metal film
resistors, fusible resistors, etc.)
6. Check if replaced wires do not contact
sharply edged or pointed parts.
7. Make sure that foreign objects (screws,
solder droplets, etc.) do not remain inside the
set.
MAKE YOUR CONTRIBUTION TO
PROTECT THE ENVIRONMENT
Used batteries wi th the ISO symbol for
recycling as well as small accumulators
(rechargeable batteries), mini-batteries (cells)
and starter batteries should not be thrown into
the garbage can. Please leave them at an
appropriate depot.
WARNING:
X-RAY RADIATION PRECAUTION
1. Excessively high can produce potentially
hazardous X-RAY RADIATION. To avoid such
hazards, the high voltage must not exceed the
speci fied limit. The normal value of the high
voltage of this TV receiver is 27 KV at zero
bean current (minimum brightness).The high
voltage must not exceed 30 KV under any
circumstances. Each time when a receiver
requires servicing, the high voltage should be
checked. The reading of the high voltage is
recommended to be recorded as a part of the
service record, It is important to use an accurate
and reliable high voltage meter.
2. The only source of X-RAY RADIATION in
this TV receiver is the picture tube. For
continued X-RAY RADIATION protection, the
replacement tube must be exactly the same type
as specified in the parts list.
3. Some parts in this TV receiver have special
safety related characteristics for X-RADIATION
protection.For continued safety, the parts
replacement should be under taken only after
referring the PRODUCT SAFETY NOTICE.
SAFETY INSTRUCTION
The service should not be attempted by
anyone unfamiliar with the necessary
instructions on this TV receiver. The following
are the necessary instructions to be observed
before servicing.
1. An isolation transformer should be
connected in the power line between the
receiver and the AC line when a service is
performed on the primary of the converter
transformer of the set.
2. Comply wi th all caution and safety related
provided on the back of the cabinet, inside the
cabinet, on the chassis or picture tube.
3. To avoid a shock hazard, always discharge
the picture tube's anode to the chassis ground
before removing the anode cap.
4. Completely discharge the high potential
voltage of the picture tube before handling.
The picture tube is a vacuum and if broken,
the glass will explode.
5. When replacing a MAIN PCB in the cabinet,
always be certain that all protective are
installed properly such as control knobs,
adjustment covers or shields,barriers, isolation
resistor networks etc.
6. When servicing is required, observe the
original lead dressing. Extra precaution should
be given to assure correct lead dressing in the
high voltage area.
7. Keep wires away from high voltage or high
tempera ture components.
8. Before returning the set to the customer,
always perform an AC leakage current check
on the exposed metallic parts of the cabinet,
such as antennas,terminals, screwheads,
metal overlay, control shafts,etc., to be sure
the set is safe to operate without danger of
electrical shock. Plug the AC line cord directly
to the AC outlet (do not use a line isolation
transformer during this check). Use an AC
voltmeter having 5K ohms volt sensitivity or
more in the following manner.Connect a 1.5K
ohm 10 watt resistor paralleled by a 0.15µF
AC type capacitor, between a good earth
ground (water pipe, conductor etc.,) and the
exposed metallic parts, one at a time.Measure
the AC vol tage across the combination of the
1.5K ohm resistor and 0.15 uF capacitor.
Reverse the AC plug at the AC outlet and
repeat the AC voltage measurements for each
exposed metallic part. The measured voltage
must not exceed 0.3V RMS.This corresponds
to 0.5mA AC. Any value exceeding this limit
constitutes a potential shock hazard and must
be corrected immediately.The resistance
measurement should be done between
accessible exposed metal parts and power
cord plug prongs with the power switch "ON".
The resistance should be more than 6M ohms.
PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in this
TV receiver have special safety-relate
d
characteristics.These characteristics are offe
r
p
assed unnoticed by visual spection and the
p
rotection afforded by them cannot necessari l
y
b
e obtained by using replacement components
rates for a higher voltage, wattage, etc.The
replacement parts which have these special
safety characteristics are identified by marks o
n
the schematic diagram and on the parts l
ist.Before replacing any of these components,
read the parts list in this manual carefully. The
use of substitute replacement parts which do
not have the same safety characteristics as
speci fied in the parts list may create shock,
fire, X-RAY RADIATION or other hazards.
FEATURES
- POWER SUPPLY : AC 120V 50/60Hz
-COLOR SYSTEM : NTSC
VERSATILE INPUT SOURCE : TV, AV1, AV2, Side AV
- FULL FUNCTION REMOTE CONTROLLER
- AUTOMATICALLY TURN OFF THE SET WHEN
- SIGNAL ABSENT LONGER THAN 10 MINUTES
- 181 CHANNELS
- BLUE SCREEN DISPLAY
- / V-CHIP
- SLEEP
- STANDBY
- CHANNEL SWAP
GENERAL SPECIFICATIONS
ITEM DESCRIPTION
-POWER CONSUMPTION 80Watt（ MAX.）
-TV RECEIVE SYSTEM NTSC M
-VISION INTERMEDIATE
FREQUENCY 45.75MHz
Block Dia
g
ram
Note: K2005UM havn’t TC4052.
Disassembly
In case of trouble, etc., Necessitating disassemble, please disassemble in the
order shown in the Exploded View Diagram.
Reassemble in the reverse order.
IC SPECIFICATION
-M61250
-M37150
-TDA9302
-TDA16846
-TDA2614
-24C04
Pin Descriptions
1.M61250
1. M61250
Pin No. Name Peripheral circuit of pins DC Voltage (V)
Mitsubishi Electric
M61250AFP/51FP Application Note Revision 2.1 February, 2002
37
5. Pin Description
1V RAMP CAP
1
6
8V 8V
8V
8V
8V
8V 8V 8V
8V
8V
0.3 ~ 4.7V
2AFT OUT
2
1K
5V 5V 5V 5V
8V
3
4
VIF Vcc
SIF Vcc 5.0V
5RAMP OUT 4.6V
5
8V
100
8V
6V RAMP
FEED BACK
1
6
8V 8V
8V
8V
8V
8V 8V 8V
8V
8V
Pin No. Name Peripheral circuit of pins DC Voltage (V)
Mitsubishi Electric
M61250AFP/51FP Application Note Revision 2.1 February, 2002
7AFCFILTER 3.5V
7
8V
6V 8V
8V
6K
6K
5V
8
9
DEF GND
LOGIC GND
11 H OUT
11
8V
8V
8V
VOL : 0.0V
VOH : 5.4V
10 FBP IN
VTH : 2.0V
(FBP Vth L=OFF)
VTH : 1.0V
(FBP Vth L=ON)
10
100
8V
8V
8V
12 DEF Vcc
38
Pin No. Name Peripheral circuit of pins DC Voltage (V)
Mitsubishi Electric
M61250AFP/51FP Application Note Revision 2.1 February, 2002
39
13 NC
14
15
16
R OUT
G OUT
B OUT
15
BLK
14
16
8V 8V
8V
18 INTELLIGENT
MONITOR
18
5V 5V
8V
5V
5V
19 INV FBP OUT VOL : 0.0V
VOH : 5.0V
19
5V 5V
8V
17 H VCO
FEEDBACK 3.0V
17
5V 6V5V
12K
8V
2K
6V
Pin No. Name Peripheral circuit of pins DC Voltage (V)
Mitsubishi Electric
M61250AFP/51FP Application Note Revision 2.1 February, 2002
40
21
22
23
B IN
G IN
R IN
(1)Digital OSD
VIL : 0.0V
VIH : 3.0V
(2)Analog OSD
0.7Vpp
22
8V 5V 5V 5V 5V 5V 5V
5V
23
21
24 FAST BLK 0.0-0.5V: INT RGB
1.5-3.0V: H TONE
4.0-5.0V: EXT RGB
24
100
8V
5V
5V
20 V PULSE
OUT
20
5V 5V
8V
VOL : 0.0V
VOH : 5.0V
25 CLK
CONTROL VTH : 3.0V
25
8.7V
150K
8.7V
26 SDA VIL : 0.75V
VIH : 4.25V
26
5V 5V
33K 190 100
10K
Pin No. Name Peripheral circuit of pins DC Voltage (V)
Mitsubishi Electric
M61250AFP/51FP Application Note Revision 2.1 February, 2002
41
28 POWER ON
CONTROL VTH : 3.0V
28
8.7V
150K
8.7V
29 fsc OUT 1 3.0V
29
8V
8V
31 Y SW OUT 1.7V
31
28K
VDD
5V 8V 8V
8V
30 MCU RESET H: 5.0V
L: 0.0V
30
5.7V 5.7V
8.7V
27 SCL
27
5V
33K 190 190
VIL : 0.75V
VIH : 4.25V
Pin No. Name Peripheral circuit of pins DC Voltage (V)
Mitsubishi Electric
M61250AFP/51FP Application Note Revision 2.1 February, 2002
42
33 ACL/ABCL
34 X-TAL 3.58 3.3V
33
8V
5V 5V 5V
34
970
100
8V
5V 5V
35
36
DRIVEGND
Video/Chroma
GND
0.0V
32 MCU 5.7VREG
OUT 5.7V
32
1.25V
8.7V 8.7V 8.7V
8.7V
37 CHROMA
APC FILTER 3.2V
37
4.3K
8V
5V5V5V5V5V
Pin No. Name Peripheral circuit of pins DC Voltage (V)
Mitsubishi Electric
M61250AFP/51FP Application Note Revision 2.1 February, 2002
43
38 EXT/C IN 1.7V
38
100
5V 5V 5V 5V 5V
8V
39
40
DRIVE Vcc
Video/Chroma
Vcc
5.0V
41 TV/Y IN 1.7V
41
100
5V 5V 5V 5V 5V
8V
42 VREG Vcc 8.7V
43 AUDIO ATT
FILTER
2.75 ~ 3.25V
43
8V
8V 8V
8V
5V
3K
Pin No. Name Peripheral circuit of pins DC Voltage (V)
Mitsubishi Electric
M61250AFP/51FP Application Note Revision 2.1 February, 2002
44
8V
44 Hi Vcc
45
46
NC
49 5.7 VREG
OUT 5.7V
49
5.7V
8V 8V 8V
8.7V
47 8.7 VREG
OUT 8.7V
47
42
48 LIMITER IN 2.5V
40
20
p
48
5K
5K
5V 5V
8V
Pin No. Name Peripheral circuit of pins DC Voltage (V)
Mitsubishi Electric
M61250AFP/51FP Application Note Revision 2.1 February, 2002
45
50
INTER
CARRIER
OUT 2.3V
50
14K
5V
5V
8V
51 AUDIO OUT 2.3V
53 EXT AUDIO
IN
52 AUDIO
BYPASS
54 FM DIRECT
OUT
2.3V
2.3V
3.0V
54
25K
200
5V 8V
8V
53
33K
8V
8V
8V 8V
51
28K
8V 8V 8V 8V 8V 8V
8V
52
53.7K
53.7K 10.5K
10.5K
100
5V 5V 5V
8V
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