Casio tv880b Service Manual
(without price)
TV-880B (KX-518B)
(For NTSC)
NOV. 1998
TV-880B
INDEX
R
CONTENTS
SPECIFICATIONS ......................................................................................... |
1 |
BLOCK DIAGRAM ....................................................................................... |
2 |
ADJUSTMENTS ............................................................................................ |
3 |
PRINTED CIRCUIT BOARDS ....................................................................... |
5 |
EXPLODED VIEW ......................................................................................... |
7 |
PARTS LIST .................................................................................................. |
8 |
SCHEMATIC DIAGRAMS ........................................................................... |
11 |
SPECIFICATIONS
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Item |
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Specification |
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1. |
Type |
LCD Color Television |
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2. |
Reception Frequencies |
UHF: UHF band |
CH 14 – CH 69 (model B) |
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CH 21 – CH 69 (models C and N) |
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CH 21 – CH 68 (model D) |
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VHF: VHF band |
CH 2 – CH 13 (model B) |
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CH 2 – CH 12 (models C and N) |
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3. |
Display Element |
High resolution color liquid crystal display |
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(TI-STN Type) |
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4. |
Drive System |
Passive matrix system |
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5. |
Screen Size |
2.3 inches |
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6. |
Backlight |
High luminance fluorescent material |
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7. |
Antenna |
Rod antenna (VHF, UHF) |
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8. |
Speaker |
1 1/8ø inches (28 mm) × 1 |
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9. |
Connection Terminals |
Earphone jack (3.5ø mini) |
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External power source jack (DC IN 6V) |
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Audio/Video input jack (3.5ø mini) |
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10. |
Power Supply |
3-way power supply system |
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Batteries: |
4 AA-size dry batteries |
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AC: |
AC adaptor AD-K64/AD-K65 (option) |
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Car battery: Car adaptor CA-K65 (option) |
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11. |
Power Consumption |
Approx. 3.1 W |
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Approx. 3.4 W (Model B only) |
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12. |
Ambient Temperature Range |
32°F (0°C) ~ 104°F (40°C) |
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13. |
Dimensions |
3 1/4" (W) × 1 7/16" (D) × 5 1/16" (H) inches |
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83 (W) × 36 (D) × 128 (H) mm |
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14. |
Weight |
Approx. 6.7 oz |
190 g (excluding batteries) |
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— 1 —
— 2 —
BATTERY 1.5 V × 4
AC ADAPTOR 6V
EXTERNAL VIDEO
EXTERNAL AUDIO
EAR PHONE
SP
BLOCK DIAGRAM
ANT
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TUNER |
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(TEAA1) |
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BT |
BV |
BS U. V |
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POWER SW
BAND SW
AUDIO1 |
VIDEO1 |
VIDEO2
AV
JACK AVB
AUDIO2 
VCC1-1
AUDIO AMP
NJM2070M
VCC2
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L-PCB |
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PRE |
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SAW |
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AMP |
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FILTER |
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VCC2 (4.7 |
V) |
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DC DC |
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VCC1-1 |
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CONVERTER |
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TRANS |
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VCC2 |
VCC7 BT |
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CHROMA |
TUNING |
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BT GEN |
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M52042FP |
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BA 10358 |
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RGB |
HD |
C-SYNC |
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TU |
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VCC2-8 |
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AFI |
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A D CONVERTER |
UV |
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CONTROLLER |
HL |
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OM6006 |
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A MUTF |
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MODULE |
VIF/SIF
(M51348FP)
A-MUTE |
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AFT |
AUDIO1 |
VIDEO1 |
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VCC2 (4.0 V)
VCC7 (40 V)
VEE1 (—5 V)
VCC7 VEE1
VOLTAGE
SUPLLY
FOR LCD
DRIVER
MODULE
POWER
SUPPLY
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LAMP |
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BL-PCB |
CN710 |
VCC1-1 GND |
CN950 |
INVERTER |
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IRANS |
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LCM
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VCC2-0 GND |
LCD |
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V1. V3. V0. V4. VO |
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CN700 |
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CK1. CK2 |
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D1~ 6 |
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SNB STR |
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CNB2. CDB2. CFB2 |
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EN1. EN2 |
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LCD DRIVER |
LCD DRIVER |
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051 |
051 |
LCD DRIVER 5151
ADJUSTMENTS
1.VCC2 adjustment, VCC2-3, VCC7, VEE1 voltage check
2.LLD coil adjustment
3.Free running frequency adjustment
4.Contrast adjustment
5.TINT pot adjustment
Preparations
1.Connect AVB (CP725) to GND.
2.Set SW100 on UHF mode.
Adjustment procedures
1.VCC2 adjustment, VCC2-3, VCC7, VEE1 voltage check
∙Condition
Power supply: Vcc1-1 = 5.0 ± 0.05 [V]
∙Adjustment
Apply 5.0 ± 0.05 [V] on Vcc1-1 (CP101).
Adjust VR100 so that Vcc voltage becomes 4.90 ± 0.02 [V].
∙Checking
VCC2-3 (CP-105) = 3.87 ~ 4.13 [V] VCC7 (CP103) = 36.0 ~ 44.0 [V] VEE1 (CP104) = –4.5 ~ –5.5 [V]
2.LLD coil adjustment
∙Conditions
(1)Signals
Broadcasting system: M/M Color system: NTSC color bar
(2)Signal level
Input electric field: 40 ± 5dBμ (IF AGC full gain), P/S = 10dB
(3)Other conditions
US IF (Input electric field: terminated with 75-ohm resistance) Power supply: Vcc1-1 = 5.0 ± 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).
(Reference: C= 1500 pF, R = 1 Kohm)
∙Confirmation
There should be no waveform distortion (erroneous synchronization, etc.), under sensitivity (video detector output level is abnormally small, etc.).
3.Free running frequency adjustment
∙Conditions
(1)Signal
No signal (NTSC standard signal should be applied only at synchronous check)
(2)Signal level
Input electric field only at synchronous check: 70 dBμ (terminated with 75-ohm resistance), P/S = 10 dB
(3)Other conditions
US IF input only at synchronous check (input electric field with 75-ohm termination).
Connect SYF terminal (CP729) and VCC2-7. Power supply: Vcc1-1 = 5.0 ± 0.05 [V] Room temperature: 20 ± 10 [°C]
—3 —
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