Casio EV-660D, EV-660N, EV-660I, EV-660C Service Manual

EV-660C (PAL B / G,H)

INDEX

EV-660I (PAL B / G) EV-660N (PAL B / G,H) EV-660D (PAL I)

(KX-637)

SEP. 1999

(without price)

EV-660

Ver.1 Feb / 2000

CONTENTS

SPECIFICATIONS ......................................................................................... 1

BLOCK DIAGRAM ....................................................................................... 2

ADJUSTMENTS ............................................................................................ 3

EV-660C/I/N ............................................................................................... 4

EV-660D..................................................................................................... 9

PRINTED CIRCUIT BOARDS ..................................................................... 14

EXPLODED VIEW ....................................................................................... 16

PARTS LIST ................................................................................................ 17

SCHEMATIC DIAGRAMS ........................................................................... 19

SPECIFICATIONS

Item Specification

1. Type LCD Color Television

2. Reception Frequencies UHF: UHF band CH 21 – CH 69 (models C and N) CH 21 – CH 68 (model D)

VHF: VHF band CH 2 – CH 12 (models C and N)

3. Display Element High resolution color liquid crystal display (TN Type)

4. Drive System TFT active matrix system

5. Screen Size 3 inches

6. Backlight High luminance fluorescent material

7. Antenna Rod antenna (VHF, UHF)

8. Speaker

9. Connection Terminals Earphone jack (3.5ø mini)

10. Power Supply 3-way power supply system

11. Power Consumption Approx. 3.8 W

12. Ambient Temperature Range 32°F (0°C) ~ 104°F (40°C)

13. Dimensions 3 7/16" (W) × 1 9/16" (D) × 5 1/16" (H) inches

14. Weight Approx. 8.5 oz 240 g (excluding batteries)

Model Color System TV System Channel

/16ø inches (28 mm) × 1

External power source jack (DC IN 6V) Audio/Video input jack (3.5ø mini)

Batteries: 4 AA-size dry batteries AC: AC adaptor AD-K64/AD-K65 (option) Car battery Car adaptor CA-K65 (option)

87 (W) × 39 (D) × 128 (H) mm

EV-660C/N PAL B/G, H CCIR VHF: 2 ~ 12 ch UHF: 21 ~ 69 ch

EV-660D PAL –/I UK — UHF: 21 ~ 68 ch

EV-660I PAL B/G ITALY VHF: A ~ H2 ch UHF: 21 ~ 69 ch

— 1 —

VCOM AMP

(NJM3414AVP)

L-PCB

LAMP

SUB-PCB

VCC2

VCC7

BATTERY 1.5V

4 AFT

AC ADAPTOR 6V

VCC1-1 EXT-R

EXT-G

LCM

COD30T3015LN

EXTERNAL VIDEO

VIDEO2

VCOM

EXTERNAL AUDIO

R,G,B

VCC1-1

AUDIO2

Vcc7(30V)

Vcc6(18.5V)

Vcc5(12V)

Vcc2(4.8V)

Vee1(-10.5V)

CN920

CN700

CSYNC

HDB

FRP

CLR,SRT1,MCLK

VIDEO1

AUDIO1

ANT

TUNER

(TEPE5-01)

LCD

384*243

INVERTER

TRANS

(C-8126)

UPKEY

DOWNKEY

SOURCE

DRIVER

SOURCE

DRIVER

GATE DRIVER

EAR

PHONE

VCC2-4

DOWNUPVCC1-1

GND

VCC6

VCC5-1

VCC2-5

GND

VEE1

MCLK

CLROESRTL

SRTR

RESET

GSRT

GPCK

GRES

HCNT

MCLK

CLROESRTL

SRTL

SRTR

RESET

GSRT

GPCK

GRES

HCNT

POWER SW

BAND SW

AV JACK

AUDIO AMP

(NJM2070M)

DC/DC

CONVERTER

TRANS

TFT

CONTROLER

(CM7017L3)

TFT

CHROMA

(IR3Y18A)

TUNING

CONTROLER

(SED3950F)

PRE

AMP

SAW

FILTER

VIF/SIF

(M51348FP)

TUNING

BT AMP

(BA10358)

BLOCK DIAGRAM

— 2 —

ADJUSTMENT

1. Vcc2 adjustment, Vcc7, Vcc6, Vcc5, Vee1 voltage check

2. LLD coil adjustment

3. Free running frequency adjustment

4. VOM AC and VCOM DC coarse adjustment

5. Contrast, Bright adjustment

6. COLOR adjustment

7. BCC coil adjustment

8. VCOM DC adjustment

Preparations

1. For the above 1 - 7 adjustments, connect JACK to the ground GND(OV).

Adjustment And Test Point Locations

CP238

CP750

T200

VR730

T300

CP344

VR300

CP711

CP324

CP308

CP705

VR301

VR303

CP725

VR710

CP108

CP109

CP106

CP107

CP101

VR100

CP105

Top View Bottom View

— 3 —

Adjustment procedures (EV-660C/I/N)

1. VCC2 adjustment, VCC7, VCC6, VCC5, VEE1 voltage check

• Condition (1) Signal

No signal

(2) Other conditions

Power supply: Vcc1-1 = 5.00 ± 0.05 [V]

• Adjustment Apply 5.00 ± 0.05 [V] on Vcc1-1. Adjust VR100 so that Vcc2 (CP108) voltage becomes 4.80 ± 0.02 [V].

• Checking VCC7 (CP105) = 27.1 ~ 33.4 [V] VCC6 (CP106) = 18.0 ~ 20.0 [V] VCC5 (CP107) = 11.0 ~ 13.0 [V] VEE1 (CP109) = –12.0 ~ –10.0 [V]

• Block diagram

L-PCB

VCC1-1

Stabilizer

VCC7 VCC6 VCC5 VCC2 VEE1

Digital Voltmeter

2. LLD coil adjustment

• Conditions (1) Signals

Broadcasting system: B/G Color system: PAL color bar

(2) Signal level

Input electric field: 46 ± 3 dBµ (IF AGC full gain), P/S = 10 dB

(3) Other conditions

CCIR IF (Input electric field: terminated with 75 Ω resistance) As to VIDEO signal, use signal source equivalent to TG7. Power supply: Vcc1-1 = 5.00 ± 0.05 [V]

• Adjustment Monitor video detection signal (CP238) via a low-pass filter of 100 kHz cutoff frequency and adjust LLD coil T200 so that its DC level is minimum (waveform’s amplitude is maximum).

• Confirmation There should be no waveform distortion (erroneous synchronization, etc.), under sensitivity (video detector output level is abnormally small, etc.).

• Block diagram

Signal generator

Stabilizer

IF signal

VCC1-1

L-PCB

Detector OUT

Low-Pass Filter

Adjust to minimize the DC level.

DC IN Oscilloscope

— 4 —

3. Free running frequency adjustment

• Conditions (1) Signal

No signal (PAL standard signal should be applied only at synchronous check)

(2) Signal level

Input electric field only at synchronous check: 70 ± 3 dBµ (terminated with 75Ω resistance), P/S = 10 dB

(3) Other conditions

CCIR IF input only at synchronous check (input electric field with 75 Ω termination). Connect SYF terminal (CP725) and GND. Power supply: Vcc1-1 = 5.00 ± 0.05 [V] Room temperature: 20 ± 10 [°C]

• Adjustment Monitoring HDB (CP705) with a frequency counter, adjust VR710 so that the frequency is 15.625 ± 0.1 [kHz].

• Caution (1) Disconnect the wire between SYF terminal. Applying IF signal make sure that synchronization is normal

on the display.

• Block diagram

Signal generator

IF signal

SYF

GND

HDB

Frequency Counter

Stabilizer

L-PCB

VCC1-1

4. VCOM AC and VCOM DC coarse adjustment

• Conditions (1) Signals

Broadcasting system: B/G Color system: PAL color bar

(2) Signal level

Input electric field: 70 ± 3dBµ (terminated with 75Ω resistance), P/S = 10 dB

(3) Others

CCIR IF input (input electric field should be terminated with 75Ω resistance) Use VIDEO signal equivalent to TG7. Power supply should be Vcc1-1 = 5.00 ± 0.05V.

• Adjustment (1) Confirm that the amplitude of VCOM output (CP750) is 6.0 ± 0.5 [V]. (2) Adjust VR730 so that Low level voltage of VCOM output (CP750) is 2.4 ± 0.2 [V].

• Block diagram

L-PCB

Signal generator

IF signal

Stabilizer

VCC1-1

CP750

— 5 —

6.0 V

Oscilloscope

2.4 V GND

5. Contrast, Bright adjustment

• Conditions (1) Signals

Broadcasting system: B/G Color system: PAL color bar

(2) Signal level

Input electric field: 70 ± 3 dBµ (terminated with 75Ω resistance), P/S = 10 dB

(3) Others

CCIR IF input (input electric field should be terminated with 75Ω resistance) As to VIDEO signal, use signal source equivalent to TG7. Supplying power should be VCC1-1 = 5.00 ± 0.05 V

• Adjustment (1) Apply VCC2-3 (CP344) voltage on KILLER terminal (CP308) via 22 kΩ resistance.

(2) Triggering FRP signal (CP71 1), observe VB waveform (CP324) and adjust BRIGHT VR so that pedes-

tal-pedestal voltage becomes 5.0 ± 0.1[V].

(3) Adjust VR303 so that VB (CP324) waveform's pedestal - white peak voltage is 3.5 ± 0.1[V].

• Caution (1) Make sure that waveforms are not distorted.

(2) After the adjustment, disconnect VCC2-3 voltage from the killer terminal.

(Reference: Use white 75% for PAL color bar.)

(3) Do not move BRIGHT VR until TINT and COLOR adjustments are completed.

• Block diagram

Signal generator

Stabilizer

IF signal

VCC1-1

B output

L-PCB

CP308

3.5 – 0.1 V

VCC2-3

22 KΩ

5.0 – 0.1 V

Oscilloscope

— 6 —

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