(with price)
EV-2500C/I/N
JUL. 1995
INDEX
(KX-618C/I/N)
R
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 |
— 1 —
SPECIFICATIONS
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Specification |
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1. |
Reception channels |
TV— EV-2500C/N : |
VHF: 2 ~ 12 ch |
UHF: 21 ~ 69 ch |
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EV-2500I : |
VHF: A ~ H2 ch |
UHF: 21 ~ 69 ch |
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RADIO— FM: 88~108 MHz AM: 530~1710 KHz |
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2. |
Power voltage |
DC 6.0 V |
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3. |
Power consumption |
Approx. 3.5 W |
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4. |
Current consumption |
Approx. 580 mA |
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5. |
Battery life (with alkaline batteries) |
Approx. 11 hours |
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Batteries |
: 3 D size batteries |
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6. |
Power supply |
Car adaptor : CA-K65 |
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AC adaptor |
: AD-K65, 64 |
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Earphone jack |
: 3.5ø mini |
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7. |
Connection terminals |
External power jack |
: 6.0 V DC IN |
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External antennea jack : 3.5ø mini |
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Audio / Video jack |
: 3.5ø |
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8. |
Screen size |
2.5 inches |
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9. |
No. of picture element |
61,380 (220 × 279) dots |
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10. |
Dimensions |
115 (W) × 61.7 (D) × 112 (H) mm |
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4 1/2 (W) × 2 2/5 (D) × 4 2/5 (H) |
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11. |
Weight |
360 g excepting batteries |
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12.7 oz excepting batteries |
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AC adaptor |
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: AD-K65,64 |
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12. |
Options |
Car adaptor |
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: CA-K65 |
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RF connector |
: CF-13 |
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Antenna matching device : AS-35S |
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— 2 —
BLOCK DIAGRAM
TV
Antenna
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IC200 |
4 |
IC600 |
Speaker |
1 |
TU200 |
2 |
Q200 |
Video |
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VR600 |
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Sound Det. |
Audio |
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Tuner |
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IF Amp. |
FM |
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Amp. |
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AFT Circuit |
Volume |
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AGC Circuit |
Control |
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7 |
IC270 |
IC300 |
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5 |
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Tuning |
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Voltage |
Chroma |
LCD |
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Generator |
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Circuit |
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6 IC700
Display
Control
Auto-Tuning
Control
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VCC1 (4.5 ± 0.05 V) |
Power |
VCC2 (4.5 ± 0.05 V) |
VCC7 (25.9 ~ 31.3 V) |
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Supply |
VCC6 (10.0 ~ 12.0 V) |
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VEE1 (–8.0 ~ –7.0 V) |
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VEE2 (–18.4 ~ –16.0 V) |
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.
— 3 —
CIRCUIT DESCRIPTION
POWER SUPPLY
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VCC2-3 (4.5 V) |
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L102 |
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VCC2-2 (4.5 V) |
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CP105 |
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T100 |
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D158 MA143A |
R160 |
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100u |
VCC7 (25.9 ~ 31.3 V) |
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3 |
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LC12U-35 |
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R108 |
270K |
R110 |
270 |
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C146 |
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68 |
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CP110 |
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VCC6 (10.0 ~ 12.0 V) |
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4 |
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OPEN |
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Q110 |
2SD1819A-R |
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CP111 |
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Q111 |
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D156 |
MA141K |
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1 |
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3 |
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L101 |
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VCC2-1 (4.5 V) |
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2SD1119-R |
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D100 |
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R107 |
C137 |
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CP112 |
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100u |
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CP113 |
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MA141K |
33K |
B6800p |
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6 |
D154 MA142WK |
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6.3 V 220 |
D110 |
MA3051-L |
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Q101 |
C140 |
R115 |
9 |
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D152 |
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2SD1819A-R |
CH470p |
100 |
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7 |
MA142WK |
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VEE1 (-8.0 ~ -7.0 V) |
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C100 |
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BH102K |
R100 |
0R00 |
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2.2K |
C145 |
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D150 |
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CP114 |
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8 |
MA142WK |
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VEE2 (-18.4 ~ -16.0 V) |
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C105 2.2 |
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B1500p |
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C110 25 V 10 |
C112 10SL6R8M |
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C114 6SL 15M |
C116 6.3 V 100 |
C118 16 V 22 |
C120 35 V 22 |
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TM100 |
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R105 3.3K |
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R113 |
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R161 33K |
CP115 |
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VR100 |
2K |
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CP106 |
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GND |
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Figure 1
The power supply consists of a DC-DC converter and the associated circuit and supplies the voltages as shown in Table 1.
Name |
Voltage |
Function |
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VCC2-1 |
4.50 ± 0.02 V |
Main voltage |
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VCC7 |
25.9 |
~ 31.3 V |
Tuning voltage |
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VCC6 |
10.0 |
~ 12.0 V |
Display voltage |
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VEE1 |
–8.0 ~ –7.0 V |
Display voltage |
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VEE2 |
–18.4 ~ –16.0 V |
Display voltage |
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Table 1
— 4 —
DISASSEMBLY
1.Remove the battery case.
2.Remove the three screws and the lower case.
3. Remove the three knobs.
4. Remove the screw and resolder the two wires for the speaker.
5. Remove the PCB ass'y.
— 5 —
DIAL STRINGING DIAGRAM
Turn the pulley counterclockwise.
9
2
1 
0
3 
8
4
Sliding pointer |
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A |
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0.8 mm |
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6
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Wrap around 4 times. |
— 6 —
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ADJUSTMENT |
TV |
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Items to Be Adjusted |
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Item |
Measuring Instrument |
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VCC2-1 voltage setting |
Voltmeter |
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Video detection coil adjustment |
TV signal generator, pattern generator, oscilloscope, |
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low-pass filter |
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AFT coil adjustment |
Sweep generator, oscilloscope, voltmeter |
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Contrast adjustment |
TV signal generator, pattern generator, oscilloscope |
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Tint adjustment |
TV signal generator, pattern generator, oscilloscope |
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AGC adjustment |
TV signal generator, pattern generator, IF levelmeter |
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Vcom adjustment |
Photo diode, photo sensor amp., bandpass filter, oscilloscope |
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Free-Running frequency adjustment |
Frequency counter |
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RADIO |
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When the radio is defect, replace the radio PCB unit.
Adjustment and Test Point Locations
T201 |
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VR200 |
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T200 |
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VR303
T300
VR740
VR300 
VR100
Top View
— 7 —
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IF Pad |
TP7 (CP208) |
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TP2 (CP201) |
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TP8 (CP334) |
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TP4 (CP217) |
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TP3 (CP218) |
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TP5 (CP339) |
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TP6 (CP322)
TP1 (CP113) 
Bottom View
Equipment Connection / Adjustment Procedure
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VCC2-1 Voltage Setting |
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EV-2500 |
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16 169 |
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Voltmeter |
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set |
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Output |
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TP1 |
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Input |
Input |
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Input |
Adjust |
Output |
Output |
Result |
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Connection |
Point |
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Signal |
Connection |
Point |
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VR100 |
Voltmeter |
TP1 |
Adjust to obtain a 4.50 ± 0.02 V |
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reading on the voltmeter. |
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— 8 —
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Video Detection Coil Adjustment |
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* Desolder the IF pad to open. |
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Pattern |
Signal |
EV-2500 |
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generator |
generator |
set |
Oscilloscope |
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Low-pass |
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filter |
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Input |
Output |
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TP2 |
TP3 |
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Input |
Input |
Input |
Adjust |
Output |
Output |
Result |
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Connection |
Point |
Signal |
Connection |
Point |
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Pattern |
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Color bar |
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38.9 MHz |
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generator |
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Low-pass filter |
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Adjust to obtain the minimum |
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TP2 |
(EV-200C,I,N) |
T200 |
TP3 |
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Signal |
39.5 MHz |
Oscilloscope |
DC level. |
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generator |
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(EV-200D) |
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45 ± 3 dBμ |
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AFT Coil Adjustment
* Desolder the IF pad to open.
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Sweep |
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EV-2500 |
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generator |
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set |
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Oscilloscope |
Voltmeter |
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Input |
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Output |
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TP2 |
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TP4 |
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38.9 ± 5 MHz |
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Adjust to obtain a 1.4 ± 0.2 V |
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Sweep |
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(sweep) marker: |
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reading on the voltmeter. |
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TP2 |
38.9 MHz (EV-200C,I,N) |
T201 |
Voltmeter |
TP4 |
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Confirm that the marker is at |
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39.5 |
± 5 MHz |
Oscilloscope |
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generator |
(sweep) marker: |
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the middle of the S-curve on |
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39.5 MHz (EV-200D) |
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the oscilloscope. |
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70 |
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μ |
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3 dB |
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Contrast Adjustment |
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* Desolder the IF pad to open. |
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TP1 |
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Pattern |
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Signal |
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EV-2500 |
10 kohm |
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generator |
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generator |
set |
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Oscilloscope |
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CP312 (KILLER) |
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Input |
Output |
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TP2 |
TP5(VC) |
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Pattern |
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Color bar |
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Adjust so |
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generator |
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38.9 MHz |
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that the step |
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TP2 |
(EV-200C,I,N) |
VR300 |
Oscilloscope |
TP5 |
form wave |
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Signal |
39.5 MHz |
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becomes 2.8 |
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generator |
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(EV-200D) |
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± 0.1 Vp-p. |
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70 ± 3 dBμ |
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2.8± 0.1 V P.P
— 9 —
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