R
(with price)
EV-2500C/I/N (KX-618C/I/N)
JUL. 1995
INDEX
-- 1 --
CONTENTS
SPECIFICATIONS ......................................................................................... 2
BLOCK DIAGRAM ........................................................................................ 3
CIRCUIT DESCRIPTION ............................................................................... 4
DISASSEMBLY ............................................................................................. 5
DIAL STRINGING DIAGRAM ........................................................................ 6
ADJUSTMENT ............................................................................................... 7
TROUBLESHOOTING ................................................................................. 12
PRINTED CIRCUIT BOARDS ..................................................................... 13
EXPLODED VIEW ....................................................................................... 15
ELECTRICAL PARTS LIST ......................................................................... 16
MECHANICAL PARTS LIST ....................................................................... 23
IC AND TRANSISTOR LEAD IDENTIFICATION ........................................ 25
SCHEMATIC DIAGRAMS ........................................................................... 27
WAVEFORMS .............................................................................................. 29
-- 2 --
SPECIFICATIONS
Item
Specification
1. Reception channels
TV-- EV-2500C/N :
VHF: 2 ~ 12 ch
UHF: 21 ~ 69 ch
EV-2500I
:
VHF: A ~ H2 ch UHF: 21 ~ 69 ch
RADIO-- FM: 88~108 MHz
AM: 530~1710 KHz
2. Power voltage
DC 6.0 V
3. Power consumption
Approx. 3.5 W
4. Current consumption
Approx. 580 mA
5. Battery life (with alkaline batteries)
Approx. 11 hours
Batteries
: 3 D size batteries
6. Power supply
Car adaptor : CA-K65
AC adaptor : AD-K65, 64
Earphone jack
: 3.5ø mini
7. Connection terminals
External power jack
: 6.0 V DC IN
External antennea jack : 3.5ø mini
Audio / Video jack
: 3.5ø
8. Screen size
2.5 inches
9. No. of picture element
61,380 (220
× 279) dots
10. Dimensions
115 (W)
× 61.7 (D) × 112 (H) mm
4 1/2 (W)
× 2 2/5 (D) × 4 2/5 (H)
11. Weight
360 g excepting batteries
12.7 oz excepting batteries
AC adaptor
: AD-K65,64
12. Options
Car adaptor
: CA-K65
RF connector
: CF-13
Antenna matching device : AS-35S
-- 3 --
BLOCK DIAGRAM
TV
1
-- Color tuner: TU200 TEPU5-02
Selects a desired radio wave and changes it to the video IF signal.
2
-- Video IF amp.: Q200 2SC4238
Amplifies the video IF signal output from tuner TU200 by 10 times (20 dB).
3
-- Video det./Sound det./FM det./AFT/AGC: IC200 M51348FP
Eliminates the carrier wave in the video IF signal, and picks up the video signal and the sound IF signal.
Also, the sound signal is picked up from the sound IF signal by FM detection.
4
-- Audio amp.: IC600 NJM2070M
Sound amplification.
5
-- Chroma circuit: IC300 IR3P90Y
Generates the tricolor (red, green, and blue) from the video signal.
6
-- Display control/Auto-tuning control: IC700 MSM6770GS
Controls the display.
7
-- Tuning voltage generator: IC270 BA10358F
Generates the tuning voltage with the tuning pulse output from 6.
Antenna
1
TU200
2
Q200
3
IC200
7
Tuning
Voltage
Generator
VR600
Volume
Control
4
IC600
Speaker
IC300
IC700
LCD
Chroma
Circuit
Display
Control
Auto-Tuning
Control
5
6
VCC1 (4.5 ± 0.05 V)
VCC2 (4.5 ± 0.05 V)
VCC7 (25.9 ~ 31.3 V)
VCC6 (10.0 ~ 12.0 V)
VEE1 (8.0 ~ 7.0 V)
VEE2 (18.4 ~ 16.0 V)
IC270
Power
Supply
Audio
Amp.
IF Amp.
Tuner
Video
Sound
Det.
FM
AFT Circuit
AGC Circuit
Det
-- 4 --
CP105
R108
270K
R110
270
Q110
2SD1819A-R
Q111
2SD1119-R
C137
R107
D100
MA141K
33K
B6800p
C140
CH470p
R115
100
6.3
V
220
C100
D110
MA3051-L
2.2
BH102K
TM100
Q101
2SD1819A-R
2.2K
R113
R105
3.3K
VR100
2K
C105
C145
B1500p
CP106
1
2
9
6
3
4
5
6
7
8
T100
LC12U-35
D158 MA143A
R160
68
C146
OPEN
D156 MA141K
D154 MA142WK
D150
MA142WK
D152
MA142WK
L101
100u
CP110
CP111
CP113
CP114
CP115
C110
25
V
10
C112
10SL6R8M
C114
6SL
15M
C116
6.3
V
100
C118
16
V
22
C120
35
V
22
R161
33K
VEE2 (-18.4 ~ -16.0 V)
L102
100u
R100
0R00
GND
CP112
1
2
3
VEE1 (-8.0 ~ -7.0 V)
VCC2-1 (4.5 V)
VCC6 (10.0 ~ 12.0 V)
VCC7 (25.9 ~ 31.3 V)
VCC2-2 (4.5 V)
VCC2-3 (4.5 V)
Figure 1
CIRCUIT DESCRIPTION
Name
Voltage
Function
VCC2-1
4.50
± 0.02 V
Main voltage
VCC7
25.9 ~ 31.3 V
Tuning voltage
VCC6
10.0 ~ 12.0 V
Display voltage
VEE1
8.0 ~ 7.0 V
Display voltage
VEE2
18.4 ~ 16.0 V
Display voltage
Table 1
The power supply consists of a DC-DC converter and the associated circuit and supplies the voltages as shown
in Table 1.
POWER SUPPLY