Casio EV-2500C Service Manual & Parts List

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EV-2500C/I/N
(KX-618C/I/N)
JUL. 1995
INDEX
R

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  Summary of Contents for Casio EV-2500C

  • Page 1 (without price) EV-2500C/I/N (KX-618C/I/N) JUL. 1995 INDEX...
  • Page 2: Table Of Contents

    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 ........
  • Page 3: Specifications

    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...
  • Page 4: Block Diagram

    BLOCK DIAGRAM Antenna 3 IC200 1 TU200 2 Q200 4 IC600 Speaker Video VR600 Sound Det. Audio Tuner IF Amp. Amp. AFT Circuit Volume AGC Circuit Control IC270 IC300 Tuning Voltage Chroma Generator Circuit IC700 Display Control Auto-Tuning Control VCC1 (4.5 ± 0.05 V) VCC2 (4.5 ±...
  • Page 5: Circuit Description

    CIRCUIT DESCRIPTION POWER SUPPLY VCC2-3 (4.5 V) L102 VCC2-2 (4.5 V) 100u T100 D158 MA143A CP105 VCC7 (25.9 ~ 31.3 V) R160 LC12U-35 CP110 C146 VCC6 (10.0 ~ 12.0 V) OPEN Q110 2SD1819A-R CP111 D156 MA141K Q111 L101 VCC2-1 (4.5 V) 2SD1119-R D100 C137...
  • Page 6: Disassembly

    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 —...
  • Page 7: Dial Stringing Diagram

    DIAL STRINGING DIAGRAM Turn the pulley counterclockwise. Sliding pointer 0.8 mm Wrap around 4 times. — 6 —...
  • Page 8: Adjustment

    ADJUSTMENT Items to Be Adjusted Item Measuring Instrument VCC2-1 voltage setting Voltmeter Video detection coil adjustment TV signal generator, pattern generator, oscilloscope, low-pass filter AFT coil adjustment Sweep generator, oscilloscope, voltmeter Contrast adjustment TV signal generator, pattern generator, oscilloscope Tint adjustment TV signal generator, pattern generator, oscilloscope AGC adjustment TV signal generator, pattern generator, IF levelmeter...
  • Page 9 IF Pad TP7 (CP208) TP2 (CP201) TP4 (CP217) TP8 (CP334) TP3 (CP218) TP5 (CP339) TP6 (CP322) TP1 (CP113) Bottom View Equipment Connection / Adjustment Procedure VCC2-1 Voltage Setting EV-2500 16-169 Voltmeter Output Input Input Input Output Output Adjust Result Connection Point Signal Connection Point...
  • Page 10 Video Detection Coil Adjustment * Desolder the IF pad to open. EV-2500 Pattern Signal generator generator Oscilloscope Low-pass filter Input Output Input Input Input Output Output Adjust Result Connection Point Signal Connection Point Color bar Pattern 38.9 MHz generator Low-pass filter Adjust to obtain the minimum (EV-200C,I,N) T200...
  • Page 11 BCC Adjustment * Desolder the IF pad to open. Pattern Signal EV-2500 generator generator Oscilloscope Input Output TP5(VC) Input Input Input Output Output Adjust Result Connection Point Signal Connection Point Color bar Adjust T300 so that the Pattern 38.9 MHz difference Pulse A Pulse B...
  • Page 12 Vcom Adjustment * Place a photo diode on the middle of the display plate. Photo sensor amp. EV-2500 Oscilloscope Photo Bandpass diode filter AV-C1 Audio/Video jack Input Input Input Output Output Adjust Result Connection Point Signal Connection Point Photo sensor Adjust to obtain the minimum amp.
  • Page 13: Troubleshooting

    TROUBLESHOOTING Symptom Cause Solution No power supply Defective power switch (SW100). Replace. No picture and Defective DC-DC converter (T100). Replace. no sound Defective tuner (TU200). Replace. Defective Q200. Replace. Defective IC200. Replace. Defective IC300. Replace. Defective IC270. Replace. Defective IC700. Replace.
  • Page 14: Printed Circuit Boards

    PRINTED CIRCUIT BOARDS L500 D500 R500 R501 C532 C202 TU200 H300 R214 R223 R210 C791 R236 T201 R739 C259 L790 L203 C744 R238 R717 T200 C250 R226 VR303 R318 C771 R229 C746 C324 R740 C327 C751 R316 Q510 R227 C319 C773 R704 R312...
  • Page 15 SW701 SW700 SW702 JK200 R209 CP210 R203 C233 C232 C200 C234 Q200 R207 R276 C230 Q514 Q202 C270 R514 CP205 R272 R271 Q270 R280 Q512 CP102 CP223 R241 HP100 R212 IC270 CP790 R208 L201 CP791 C242 C331 C325 CP217 R729 CP100 C334 R727...
  • Page 16: Exploded View

    EXPLODED VIEW 25-5 33-3 26-1 25-6 26-2 25-2 33-1 26-3 25-1 28-2 25-4 25-3 26-4 28-1 28-3 26-7 33-2 26-6 28-4 28-3 26-5 28-2 28-3 — 15 —...
  • Page 17: Electrical Parts List

    ELECTRICAL PARTS LIST Linear PCB No. 1 FOB Japan Item Code No. Parts Name Specification N.R.Yen Unit Price Capacitors C100 2800 9175 Electrolytic capacitor (V) 6.3RC2-220MS 1 20 C105 2897 2310 Chip capacitor GR42-6Y5V225Z16PT 1 20 C110 2806 9462 Electrolytic capacitor (V) 25RC2-10MS-G10 1 20 C112...
  • Page 18 Linear PCB No. 2 FOB Japan Item Code No. Parts Name Specification N.R.Yen Unit Price C311 2892 0407 Chip capacitor GR40CH270J50PT 1 20 C312 2892 0237 Chip capacitor GR40W5R222K50PT 1 20 C313 2897 0217 Chip capacitor GR40W5R153K25PT 1 20 C314 2895 0126 Tantalum capacitor ECST1CY105R 1 20...
  • Page 19 Linear PCB No. 3 FOB Japan Item Code No. Parts Name Specification N.R.Yen Unit Price C927 2813 3213 Ceramic capacitor DE0405SL270J2K 1 20 Connectors CN510 3501 9331 Connector 5512-05A 1 10 CN700 3501 8316 Connector 52559-2090 CN900 3501 1001 Connector W-P7503#11 1 20 Diodes...
  • Page 20 Linear PCB No. 4 FOB Japan Item Code No. Parts Name Specification N.R.Yen Unit Price L756 3013 1911 Chip inductor LK2125-330K-TP 1 20 L760 3013 1848 Chip inductor BK2125HS601-T 1 20 L761 3013 1848 Chip inductor BK2125HS601-T 1 20 L790 3013 1848 Chip inductor BK2125HS601-T 1 20...
  • Page 21 Linear PCB No. 5 FOB Japan Item Code No. Parts Name Specification N.R.Yen Unit Price R225 2791 1595 Chip resistor ERJ-6GEYJ153V 1 20 R227 2791 0313 Chip resistor ERJ-6GEYJ103V 1 20 R229 2791 2176 Chip resistor ERJ-6GEYJ471V 1 20 R230 2791 1131 Chip resistor ERJ-6GEYJ271V 1 20...
  • Page 22 Linear PCB No. 6 FOB Japan Item Code No. Parts Name Specification N.R.Yen Unit Price R515 2791 1633 Chip resistor ERJ-6GEYJ123V 1 20 R516 2791 0720 Chip resistor ERJ-6GEYJ222V 1 20 R535 2791 1595 Chip resistor ERJ-6GEYJ153V 1 20 R537 2791 1633 Chip resistor ERJ-6GEYJ123V 1 20...
  • Page 23 Linear PCB No. 7 FOB Japan Item Code No. Parts Name Specification N.R.Yen Unit Price SW701 3412 0469 Switch SKHHLN 1 20 SW702 3412 0469 Switch SKHHLN 1 20 Coils ,Converter, and Transformer T100 3065 0518 DC-DC converter LC12U-35 T200 3841 0700 Coil 5KAC-03A T201...
  • Page 24: Mechanical Parts List

    MECHANICAL PARTS LIST FOB Japan Quantity Item Code No. Parts Name Specification N.R.Yen Unit Price Upper case 6609 8800 Shutter A-K618 K240113-2 6610 2360 Display plate CIA-K618 K340119-3 6610 2370 Display plate IAA-K618 K340119-4 6600 9740 Adhesive tape A-K60 K4332-1 4 20 6609 8680 Display plate holder A-K618 K140051-2...
  • Page 25 FOB Japan Quantity Item Code No. Parts Name Specification N.R.Yen Unit Price 28-3 6609 8650 Screw K440238-1 5 20 28-4 6610 0120 Blind plate C-K618 K440340-1 1 20 6609 8600 Pulley B-K618 K440170-1 1 20 3312 0035 Micro lamp BQ121-20120A 6609 8610 Sliding pointer A-K618 K340096-1 1 20...
  • Page 26: Ic And Transistor Lead Identification

    IC AND TRANSISTOR LEAD IDENTIFICATION IC/LSI IC200 IC270 M51348FP BA10358F IF AGC OUT IF AGC ADJ OUT1 IF AGC IN SyOUT –IN1 OUT2 RF AGC SyIN +IN1 IN2– AGCDL AFTC IN2+ VCCv IFIN IC600 NJM2070M IFIN VIDEO GNDv VCCs SIFOUT SIFIN –IN GNDs...
  • Page 27 IC700 MSM6770GS TU PWM VBAR TSI6 UBAR TSI5 TSI4 VMUTEB TSI3 GRES GPCK CSYNC GSRT AFTO VDD3 HCNT VSS3 TRANSISTORS 2SD1119 2SB1218A 2SC4238 2SD1819A DTC144EUW DTA143TUW — 26 —...
  • Page 28: Schematic Diagrams

    SCHEMATIC DIAGRAMS IF Pad 14 15 Notes: 1. All resistance values are indicated in "ohms" (k=10 ohms, M=10 ohms). µF). 2. All capacitance values are indicated in "µF" (p=10 3. All inductance values are indicated in "µH." — 27 —...
  • Page 29 RADIO Notes: 1. All resistance values are indicated in "ohms" (k=10 ohms, M=10 ohms). µF). 2. All capacitance values are indicated in "µF" (p=10 3. All inductance values are indicated in "µH." — 28 —...
  • Page 30: Waveforms

    WAVEFORMS 64 µs 64 µs 64 µs 1 Q200 collector 2 IC200 pin 23 3 IC200 pins 19, 20 64 µs 64 µs 64 µs 5 IC300 pins 32, 34, 36 6 IC300 pin 21 4 IC200 pin 18 125 µs 10 µs 10 µs 7 IC300 pin 39...
  • Page 31 64 µs 125 µs F IC700 pin 7 G IC300 pin 30 — 30 —...
  • Page 32 8-11-10, Nishi-Shinjuku Shinjuku-ku, Tokyo 160, Japan Telephone: 03-3347-4926...

This manual is also suitable for:

Ev-2500iEv-2500nKx-618cKx-618iKx-618n