JVC TK-C720TPE, Руководство по обслуживанию

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SECTION 3
CHARTS AND DIAGRAMS
䡵
REPLACING SUBMINIATURE “CHIP” PARTS
• Some resistors, shorting jumpers (0 ohm resistance), ceramic
capacitors, transistors, and diodes are chip parts. These chip
parts cannot be reused after they are once removed.
• Chip resistors used in some circuits are of high precision
type having little error in resistance.
To demonstrate the full capacity of this camera head, place
an order for proper parts referring to the diagrams and parts
lists in the sections 5.
• Soldering cautions:
1) Do not apply heat for more than 3 seconds.
2) Avoid using a rubbing stroke when soldering.
3) Discard removed chips; do not reuse them.
4) Supplementary cementing is not required.
5) Use care not to scratch or otherwise damage the chips.
• Definistion of the (A) and the (B) or circuit boards dia-
grams
(A) : Side on which discrete parts are assembled.
(B) : Side on which only chip parts are assembled.
• Transistors are:
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SCHEMATIC DIAGRAM NOTES
• Schematic safety precaution
!
Parts are safety related parts.
When replacing them, be sure to use the specified parts.
• Voltage and waveform measurements.
Voltage: Measured with digital voltmeter in DC range;
iris closed.
• Waveform: Color bars illuminated more than 4000lux at
3200K lighting.
• Terminal logic
Top bar of terminal name show input or output logic.
Top bar shows, the control circuit become active at nega-
tive (low) logic input for example.
B
C
E
2SA1576A
MSB1218A
B
C
E
2SC4681
MSD1819A
C
B
E
1
2
3
1
2
3
6
5
4
6
5
4
E
E
B
E
E
E E
B
B
C
B
B
C
C
C
C
B
C
XP6401
XP6534
3-1 3-1
3.1 OVERALL WIRING DIAGRAM
2
1
4
3
2
1
Vcc
(See Sec. 2.2)
Page 3-4
CN200
CN5 CN5
CN6
TP BOARD
0 6
CN6
GND
Sout
Sin
0 1
0 2
0 5
0 3
0 4
Page 3-3
Page 3-6
Page 3-8
Page 3-7
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
GND
GND
VBS
+18V
GND
+8.5V
GND
GND
GND
GND
MONITOR OUT
GND
TP OUT(+)
TP OUT(–)
GND
GND
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
TP OUT(+)
TP OUT(–)
2
1
Page 3-9
MONIT
OR