Sanyo VHR-290 Series Service Manual page 7

3513V21(N)
—
b
—
5
—
6
—
Item
C REC
CURREN
Y REC
CURRENT
Input
Colour bar
from
Colour bar
generator
Colour bar
from
Colour bar
generator
Mode
REC
REC
Point
TP181 (HOT)
Shield case
(GND)
(Video pre-
amp unit)
TP181 (HOT)
Shield case
(GND)
(Video pre-
amp unit)
Location
VR181
(Video pre-
amp unit)
VR182
(Video pre-
amp unit)
Shield case
\
TP181
REC CURRENT
\
Remark
W15vcm
f
155 * 5
mVp-p
&
1. RotateVR182 so that the luminance level is
minimize.
2. AdjustVR181 so that the signal level is 155
* 5 mVp-p.
W25V028
7
520 *20 mVp-p
+lL -IL 1
H sync
H sync
1. Connect the ground of the oscilloscope to
the Shield case of Video pre-amp.
L
2. Set the channel selector buttons to the AV
3 AdjustVR182 so that the signal level at the
1
P08v03(
VR181
VR182
REC-C
REC-Y
\/
I / \
l-l
I
TP291
AF REC
Fig. 2-3-1
TP163
TP;82
u
SW PULSE ENVELOPE
Video
pre-amp unit
L
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