Casio TV-880C User manual

R
TV-880C(PAL B / G,H)
TV-880I(PAL B / G)
TV-880N(PAL B / G,H)
TV-880D(PAL I)
(without price)
(KX-518)
TV-880
FEB. 1999
INDEX

CONTENTS
SPECIFICATIONS ......................................................................................... 1
BLOCK DIAGRAM ....................................................................................... 2
ADJUSTMENTS ............................................................................................ 3
TV-880C/I/N ............................................................................................... 4
TV-880D..................................................................................................... 7
PRINTED CIRCUIT BOARDS ..................................................................... 10
EXPLODED VIEW ....................................................................................... 12
PARTS LIST ................................................................................................ 13
SCHEMATIC DIAGRAMS ........................................................................... 16

— 1 —
Item Specification
1. Type LCD Color Television
2. Display Element High resolution color liquid crystal display
(TI-STN Type)
3. Drive System Passive matrix system
4. Screen Size 2.3 inches
5. Backlight High luminance fluorescent material
6. Antenna Rod antenna (VHF, UHF)
7. Speaker 1 1/8ø inches (28 mm) ×1
8. Connection Terminals Earphone jack (3.5ø mini)
External power source jack (DC IN 6V)
Audio/Video input jack (3.5ø mini)
9. Power Supply 3-way power supply system
Batteries: 4 AA-size dry batteries
AC: AC adaptor AD-K64/AD-K65 (option)
Car battery: Car adaptor CA-K65 (option)
10. Power Consumption Approx. 3.1 W
11. Ambient Temperature Range 32°F (0°C) ~ 104°F (40°C)
12. Dimensions 3 1/4" (W) ×1 7/16" (D) ×5 1/16" (H) inches
83 (W) ×36 (D) ×128 (H) mm
13. Weight Approx. 6.7 oz 190 g (excluding batteries)
SPECIFICATIONS
Model Color System TV System Channel
TV-880C/N PAL B/G, H CCIR VHF: 2 ~ 12 ch UHF: 21 ~ 69 ch
TV-880D PAL –/I UK — UHF: 21 ~ 68 ch
TV-880I PAL B/G ITALY VHF: A ~ H2 ch UHF: 21 ~ 69 ch

— 2 —
BLOCK DIAGRAM
TUNER
(TEAA1) PRE
AMP
ANT
SAW
FILTER VIF/SIF
(M51348FP)
POWER SW
BAND SW
DC DC
CONVERTER
TRANS
BATTERY 1.5 V ×4
AC ADAPTOR 6V
EXTERNAL VIDEO
EXTERNALAUDIO
EAR PHONE
SP
AUDIO2 VCC1-1
VCC2
VCC2 (4.0 V)
VCC7 (40 V)
VEE1 (—5 V)
AV
JACK
AUDIO AMP
NJM2070M
VCC2
TU
VCC2-8
AFI
UV
HL
A MUTF
MODULE
VIDEO2
AVB
VCC7 BT
VCC2 (4.7 V)
VCC1-1
VEE1VCC7
CHROMA
M52042FP
TUNING
BT GEN
BA 10358 VOLTAGE
SUPLLY
FOR LCD
DRIVER
A D CONVERTER
CONTROLLER
OM6006
INVERTER
IRANS
BL-PCB
LAMP
VCC1-1 GND
CN710 CN950
LCD DRIVER 5151
BT BV BS U. V
AUDIO1 VIDEO1
A-MUTE
AFT
AUDIO1
VIDEO1
RGB HD C-SYNC
CN700
LCD
LCM
L-PCB
LCD DRIVER
051 LCD DRIVER
051
VCC2-0 GND
V1. V3. V0. V4. VO
CK1. CK2
D1~ 6
SNB STR
CNB2. CDB2. CFB2
EN1. EN2
MODULE
POWER
SUPPLY

— 3 —
VR301 : Tint adjustment
VR300 : Contrast adjustment
VR700 : VCO free run frequency adjustment
VR100 : VCC2 adjustment
T200 : LLD Coil adjustment
ADJUSTMENT
Top View Bottom View
1. VCC2 adjustment, 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 And Test Point Locations

— 4 —
L-PCB
DC IN
Oscilloscope
VCC1-1
IF signal
Stabilizer
Detector OUT
Low-Pass Filter
Adjust to minimize the DC level.
Signal
generator
Adjustment procedures (TV-880C/I/N)
1. VCC2 adjustment, 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 Vcc2 (CP102) voltage becomes 4.00 ±0.02 [V].
•Checking
VCC7 (CP103) = 36.0 ~ 44.0 [V]
VEE1 (CP104) = –4.5 ~ –5.5 [V]
•Block diagram
2. LLD coil adjustment
•Conditions
(1) Signals
Broadcasting system: B/G,H
Color system: PAL color bar
(2) Signal level
Input electric field: 40 ±3dBµ(IF AGC full gain), P/S = 10 dB
(3) Other conditions
CCIR 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.).
•Block diagram
V
VCC7
VCC2
VEE1
L-PCBStabilizer VCC1-1 Digital
Voltmeter

— 5 —
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 dBµ(terminated with 75-ohm resistance),
P/S = 10 dB
(3) Other conditions
CCIR 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]
•Adjustment
Monitoring HDB (CP305) with a frequency counter, adjust VR700 so that the frequency is 15.625 ±
0.1 [kHz].
•Caution
(1) Disconnect the wire between SYF terminal and VCC2-7.
Applying IF signal make sure that synchronization is normal on the display.
(2) Use input signal pattern conforming CCIR standard.
•Block diagram
4.Contrast adjustment
•Conditions
(1) Signal
Broadcasting system: B/G,H
Color system: PAL color bar
(2) Signal level
Input electric field: 70 dBµ(terminated with 75-ohm resistance), P/S = 10 dB
(3) Other conditions
CCIR IF input (input electric field should be terminated with 75-ohm resistance).
Apply voltage of Vcc1-1 = 5.0 ±0.05 [V]
•Adjustment
Connect color terminal (CP320) to GND (CP300) so that screen becomes black and white. Adjust
contrast pot VR300 so that the voltage between pedestal level and white level of B signal (CP740) is
0.80 ±0.05 [Vp-p].
L-PCB
VCC1-1
VCC2-7 SYF
HD
Stabilizer
Signal
generator
Frequency
Counter

— 6 —
•Caution
(1) Make sure that there is no distortion on the waveforms.
(2) Connect COLOR terminal of Chroma IC (M52045FP) to GND.
(3) Monitor the B output signal with an oscilloscope via a low-pass filter (C = 2700 pF, R = 100 ohm).
•Block diagram
5.TINT pot adjustment
•Condition
(1) Signal
Broadcasting system: B/G,H
Color system: PAL color bar
(2) Signal level
Input electric field: 70 dBµ(75-ohm termination), P/S = 10 dB
(3) Other conditions
CCIR IF input (input electric field should be terminated with 75-ohm resistance).
Apply voltage of Vcc1-1 = 5.0 ±0.05 [V]
•Adjustment
Observing output signal B with an oscilloscope, adjust TINT pot VR301 so that the wave from H and
H' will be same.
•Caution
Do not connect COLOR terminal to GND.
Monitor B output signal with an oscilloscope via a low-pass filter (C = 2700 pF, R = 100 ohm).
•Block diagram
L-PCB
VCC1-1
Stabilizer
B output
Low-Pass Filter
Signal
generator
Oscilloscope
White level
Pedestal level
L-PCB
VCC1-1
Stabilizer
Low-Pass Filter
B output
Signal
generator
Oscilloscope
HH’

— 7 —
L-PCB
DC IN
Oscilloscope
VCC1-1
IF signal
Stabilizer
Detector OUT
Low-Pass Filter
Adjust to minimize the DC level.
Signal
generator
Adjustment procedures (TV-880D)
1. VCC2 adjustment, 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 Vcc2 (CP102) voltage becomes 4.00 ±0.02 [V].
•Checking
VCC7 (CP103) = 36.0 ~ 44.0 [V]
VEE1 (CP104) = –4.5 ~ –5.5 [V]
•Block diagram
2. LLD coil adjustment
•Conditions
(1) Signals
Broadcasting system: I
Color system: PAL color bar
(2) Signal level
Input electric field: 40 ±3dBµ(IF AGC full gain), P/S = 7 dB
(3) Other conditions
UK 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.).
•Block diagram
V
VCC7
VCC2
VEE1
L-PCBStabilizer VCC1-1 Digital
Voltmeter

— 8 —
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 dBµ(terminated with 75-ohm resistance),
P/S = 7 dB
(3) Other conditions
UK 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]
•Adjustment
Monitoring HDB (CP305) with a frequency counter, adjust VR700 so that the frequency is 15.625 ±
0.1 [kHz].
•Caution
(1) Disconnect the wire between SYF terminal and VCC2-7.
Applying IF signal make sure that synchronization is normal on the display.
(2) Use input signal pattern conforming UK standard.
•Block diagram
4.Contrast adjustment
•Conditions
(1) Signal
Broadcasting system: I
Color system: PAL color bar
(2) Signal level
Input electric field: 70 dBµ(terminated with 75-ohm resistance), P/S = 7 dB
(3) Other conditions
UK IF input (input electric field should be terminated with 75-ohm resistance).
Apply voltage of Vcc1-1 = 5.0 ±0.05 [V]
•Adjustment
Connect color terminal (CP320) to GND (CP300) so that screen becomes black and white. Adjust
contrast pot VR300 so that the voltage between pedestal level and white level of B signal (CP740) is
0.80 ±0.05 [Vp-p].
L-PCB
VCC1-1
VCC2-7 SYF
HD
Stabilizer
Signal
generator
Frequency
Counter