Casio TV-880B Troubleshooting guide

R
TV-880B(KX-518B)
(without price)
(For NTSC)
NOV. 1998
TV-880B
INDEX

CONTENTS
SPECIFICATIONS ......................................................................................... 1
BLOCK DIAGRAM ....................................................................................... 2
ADJUSTMENTS ............................................................................................ 3
PRINTED CIRCUIT BOARDS ....................................................................... 5
EXPLODED VIEW ......................................................................................... 7
PARTS LIST .................................................................................................. 8
SCHEMATIC DIAGRAMS ........................................................................... 11

— 1 —
Item Specification
1. Type LCD Color Television
2. Reception Frequencies UHF: UHF band CH 14 – CH 69 (model B)
CH 21 – CH 69 (models C and N)
CH 21 – CH 68 (model D)
VHF: VHF band CH 2 – CH 13 (model B)
CH 2 – CH 12 (models C and N)
3. Display Element High resolution color liquid crystal display
(TI-STN Type)
4. Drive System Passive matrix system
5. Screen Size 2.3 inches
6. Backlight High luminance fluorescent material
7. Antenna Rod antenna (VHF, UHF)
8. Speaker 1 1/8ø inches (28 mm) ×1
9. Connection Terminals Earphone jack (3.5ø mini)
External power source jack (DC IN 6V)
Audio/Video input jack (3.5ø mini)
10. 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)
11. Power Consumption Approx. 3.1 W
Approx. 3.4 W (Model B only)
12. Ambient Temperature Range 32°F (0°C) ~ 104°F (40°C)
13. Dimensions 3 1/4" (W) ×1 7/16" (D) ×5 1/16" (H) inches
83 (W) ×36 (D) ×128 (H) mm
14. Weight Approx. 6.7 oz 190 g (excluding batteries)
SPECIFICATIONS

— 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 —
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]

— 4 —
•Adjustment
Monitoring HDB (CP305) with a frequency counter, adjust VR700 so that the frequency is 15.734 ±
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.
4. Contrast adjustment
•Conditions
(1)Signal
Broadcasting system: M/M
Color system: NTSC color bar
(2)Signal level
Input electric field: 70 dBµ(terminated with 75-ohm resistance), P/S = 10 dBµ
(3)Other conditions
US 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].
•Caution
(1)Make sure that there is no distortion on the waveforms.
(2)Connect COLOR terminal of Chroma IC (M52042FP) to GND.
(3)Monitor the B output signal with an oscilloscope via a low-pass filter (C = 2700 pF, R = 100 ohm).
5. TINT pot adjustment
•Condition
(1)Signal
Broadcasting system: M/M
Color system: NTSC color bar
(2)Signal level
Input electric field: 70 dBµ(75-ohm termination), P/S = 10 dB
(3)Other conditions
US IF input (input electric field should be terminated with 75-ohm resistance).
Apply voltage of Vcc1-1 = 5.0 ±0.05 [V]
•Adjustment
Observing B output signal (CP740) with an oscilloscope, adjust TINT pot VR301 so that amplitude
difference between two center pulses is 0.1 [V].
•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).

— 5 —
PRINTED CIRCUIT BOARDS
TOP VIEWS
Linear
Back Light

— 6 —
BOTTOM VIEWS
Linear
Back Light

— 7 —
EXPLODED VIEW
14
15
10
8
12
9
16
18
6
17
19
3
27
1
21
20
22
23
29
25
24
25
26
13
428
13
11
7

PARTS LIST
LINEAR PCB
Item Code No. Parts Name Specification Q R
Diodes
D100 7101 1194 Chip diode MA111(TX) 1 C
D110 2360 2520 Chip zener diode MA8051-L(TX) 1 C
D150 7101 1194 Chip diode MA111(TX) 1 C
D152 2390 1379 Schottky diode MA729-(TX) 1 C
D155 2390 1470 Chip diode MA143A-(TX) 1 C
D180 2390 1190 Diode ERA15-01Y 1 C
D200 7101 1194 Chip diode MA111(TX) 1 C
D280 7101 1194 Chip diode MA111(TX) 1 C
D500 2360 3079 Chip zener diode MA8300-M(TX) 1 C
D701 7101 1194 Chip diode MA111(TX) 1 C
D801 2390 1477 Chip diode MA142WA-(TX) 1 C
D802 2390 1470 Chip diode MA143A-(TX) 1 C
D803 2390 1470 Chip diode MA143A-(TX) 1 C
Filter
F200 3025 1948 SAW filter SAF45MA210Z 1 C
F210 3025 1949 SIF filter SFSH4.5MCB 1 C
F220 3851 2105 Ceramic discriminator CDSH4.5MC30K 1 C
F230 3850 1259 SIF trap TPS4.5MB 1 C
Fuse
FU100 2797 5598 Chip fuse PI-R429.750 1 A
Oscillator
H300 25902731 Crystal oscillator HD-49-3.58M 1 C
ICs
IC100 2114 5867 IC TK11240BMCL 1 B
IC200 2114 1827 Linear IC M51348FP-T1 1 B
IC300 2114 3332 Linear IC M52042FP-T1 1 B
IC500 2116 0119 OP amplifier BA10358F-T1 1 B
IC600 2114 2464 Linear IC NJM2070M-T1 1 B
IC700 2012 6038 LSI ML9661GA-6006 1 B
IC710 2114 5866 IC S-81230SGUP-DQB-T1 1 B
Jacks
JK100 3501 8281 Power jack HEC0811-010010 1 C
JK250 3501 3773 Headphone jack HSJ6063-01-410 1 C
JK600 3501 5439 Jack HSJ1456-01-210 1 C
Transistors
Q101 2253 0133 Chip transistor 2SD1819A-R(TX) 1 C
Q110 2253 0133 Chip transistor 2SD1819A-R(TX) 1 C
Q111 2253 0308 Chip transistor 2SD1119-R(TX) 1 C
Q200 2250 1617 Chip transistor 2SC4417-(TX) 1 C
Q210 2253 0133 Chip transistor 2SD1819A-R(TX) 1 C
Q211 2253 0133 Chip transistor 2SD1819A-R(TX) 1 C
Q280 2259 2723 Digital transistor UN5211-(TX) 1 C
Q281 2253 0133 Chip transistor 2SD1819A-R(TX) 1 C
Q282 7101 5686 Digital transistor UN5111-(TX) 1 C
Q283 7101 5686 Digital transistor UN5111-(TX) 1 C
Q300 2253 0133 Chip transistor 2SD1819A-R(TX) 1 C
Q800 2253 0133 Chip transistor 2SD1819A-R(TX) 1 C
Q801 2253 0133 Chip transistor 2SD1819A-R(TX) 1 C
Q803 2251 0189 Chip transistor 2SB1218A-R(TX) 1 C
Q804 2251 0189 Chip transistor 2SB1218A-R(TX) 1 C
Notes: Q - Quantity per unit
R - Rank
— 8 —