Casio EV-680 Manual de usuario
— 2 —
BLOCK DIAGRAM
BT TU PCB
DP PCB
Vcc7(30V)
EXTANT Vcc6(12V)
Vcc5(7.5V)
Vcc2(5.0V)
Vee1(-15V)
VCC2
LB
HB
VCC7
BATTERY
1.5 ×4 AFT
TU
AC ADAPTER
6V
LAMP
VCC1-1 EXT-R CSYNC
EXT-G LCM
EXT VIDEO VIDEO2 VCOM
EXT AUDIO R,G,B
EARPHONE VCC1-1 AUDIO2 VDD
CN700
SP
HDB
FRP
CSYNC
BU
VIDEO1
AUDIO1
ANT
TUNER
(TNS010US) PRE
AMP SAW
FILTER VIF/SIF
(M51348FP)
TFT
CHROMA
(IR3Y29B)
TUNING
BT AMP
(BA10358F)
AV JACK
TFT LCD
383*234
EDTCA22QE0
INVERTER
TRANS
(CPU93)
SOURCE
DRIVER
SOURCE
DRIVER
GATE DRIVER
AUDIO AMP
(NJM2070)
POWER SW
BAND SW TUNING
CONTROLER
(AN5707NFAP)
VCOM AMP
(NJM4556AM)
TFT
CONTROLER
(MN5814)
CH
UPKEY
CH
DOWNKEY
CPH(CLOCK)
CPH2(CLOCK)
CPH3(CLOCK)
STV1(V_START)
STV2(V_START)
STH1(H_START)
STH2(H_START)
QH
OEH
OEV
DC/DC
CONVERTER
TRANS
(CEE98)
— 3 —
ADJUSTMENT
Items To Be Adjusted
1. VCC2 adjustment ,VCC7, VCC6, VCC5 & Vee1 voltage check
2. LLD Coil adjustment
3. Free running frequency adjustment
4. Bright, Sub-bright adjustment
5. Contrast, bright adjustment
6. VOM AC adjustment
7. VCOM DC coarse adjustment
8. TINT adjustment
9. VCOM DC adjustment
Preparations
1. For the above 1 - 8 adjustments, connect JACK (P300) to the ground (0V).
2. Set SW100 on UHF mode
Adjustment And Test Point Locations
K671BR-TU PCB
K671BR-DP PCB
BOTTOM VIEW
TOP VIEW BOTTOM VIEW
P721
P238
P152
P150
P151
P154
P153
P309
P311
P301
P313
P312
P302
P310
P304
P710
VR304 VR303 VR306
VR700
VR307VR300
VR701
VR302
VR305
T201 T200
VR100
— 9 —
PRINTED CIRCUIT BOARDS
K671B-DP PCB
TOP VIEW
K671B-TU PCB
— 10 —
BOTTOM VIEW
K671B-DP PCB
K671B-TU PCB
— 11 —
DISASSEMBLY
2. Remove the stand and the battery cover.
1. Remove the screw and the antenna.
Screw
3. Remove four screws and separate the side panel and the knob.
Screws
Side panel
— 12 —
5. Remove the screw, unsolder two speaker lines (grey and orange) and then separate the PCB Assy.
grey
orange
Screw
6. Remove the tune button and separate the tuner cover.
Remove four screws and separate the upper cover while paying attention to the hook.
Remove the speaker.
Screws
Hook
Screws
Tuner button
Tuner cover
4. Remove the connector and separate the LCD Assy.
Connectors
— 13 —
8. Remove the hook and disassemble the LCD Assy.
Hooks
Hooks
7. Remove the hook, unsolder the fluorescent lamp 1and the LCD case 2and then separate the LCD Assy.
Hooks
1
2
1
2
— 14 —
EXPLODED VIEW
21
20
27
31
22
23
24
25
13
12
10
7
6
5
4
2
1
9
8
2928
26
18
×2
14
30
3
11
3
33
8
15
16
17
17
18
18
19
S1
S2
S3
S4
S3
S3
— 16 —
SCHEMATIC DIAGRAMS
DISPLAY PCB (K671B-DP)
Chroma Circuit Display Controller Circuit
To LCD
A/V Jack
To K671BR-TU PCB
Speaker
Earphone
Jack
Audio Amplifier Circuit
DC In
Display Generator Voltage Circuit
—17 —
TUNNER PCB (K671B-TU)
To K671BR-DP PCB
Back Light
IF Detection Circuit
Power Supply Circuit
Antenna
IF Pad
Power switch
27.0 ~ 32.0.V
11.0 ~ 13.0 V
7.0 ~ 8.0 V
–16.0 ~ –14.0 V
5.00 ±0.02 V
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