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SECTION 3
ELECTRICAL ADJUSTMENT
3-1.
A-1 BOARD ADJUSTMENT
Component
side .
Voltage Adjustment (RV601)
2.
Connect anode of diode D152 to ground line.
3.
Connect dummy A to CAMERA IN terminal (CN301).
4.
Connect DC voltmeter between TP602 and ground.
5.
Turn on the power.
dummy A
resistance 220 Q /10W
(example)
co]
2200 1/4Wx7
22001
/4Wx7
2200 1/4Wx7
22021 /4Wx7
22001/4Wx7
220N1/4Wx7
2202 1/4Wx7
SECTION 4
CIRCUIT DESCRIPTION
[Power Supply Block]
AC35V and AC17.5V are supplied from the power supply
trans. PT1. AC35V is rectified in the D601 and stabilized in
the Q601. (The output voltage is adjusted in the RV601.)
Then the stabilized voltage of the high impedance output is
output to the camera with the external SYNC signal. Also,
AC17.5V is stabilized to 12V in the IC601, and used as the
circuit power supply.
[Video Signal Process Block]
The video signal input by the camera undergoes DC cut
and is terminated in the R206 (75Q ), then cancels the
external SYNC signal at the differential amplifier (IC202).
After that, it is clamped at the Q102, amplified at the Q106
and 107, and output through the buffer to the VIDEO OUT
1 and 2 terminal.
[External SYNC Signal Process Block]
The COMPOSITE SYNC is separated in the IC201 from
the SYNC signal (or video signal) input by the SYNC IN
terminal, and goes through the video amplifier (IC202) and
the R206 (75Q ), then is input to the camera with the power
supply.
[Cable Compensation Circult]
Select the gain and frequency response of the Q106 and
Q107 from the three levels according to the cable length.
[SYNC Detection Protective Circuit]
If the CAMERA IN terminal receives no input video signal
(SYNC signal), the Q154 cuts off the current according to
the Q152 and Q153 detection.
Successively, the Q158 also cuts off the current, and the
LED lamp becomes faint.
[No-load Detection Circult]
The Q160 and Q161
detect the load current, and if the
current is found to be no-load, the Q154 cuts it off and
stops the output. (faint LED)
5-1. BLOCK DIAGRAM
CN301
(O} CAMERA
IN
8
ry
|
sit
4
]
- eYNC CIN
C
;
S301
D306
ae
ON/OFF:
e
—pD
<+—
|
D307
|
Ne}
i>
(O}
|
CN305
|
| SYNC
OUT
|
LU
fava)
SECTION 5
DIAGRAMS
TL CAMERA_IN
ae
i
R
"L
1C202
ene
|
3 sync orive U
VIDE
;
|
'C ;
IC 201
1
D201
Glee
Ls
ear
eS
aeeeaaes
3
;
|
TP601
TP602
601
Q601—
|
D
°
603,
°
RECTIFIER
+35V REG
a
VOLTAGE
|
es
|
TP603
TP103
3
10601
54
D60
°
°
Qt
RECTIFIER
+12V REG
+12V
POWER DRIVE
D159
POWER DET
D156
POWER CONTROL 1,2
Q158
LED
DRIVE
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