JVC HR-D540EE - Page 36

Check Adjustment
VIDEO R226 e REC then PB 1) Terminate VIDEO OUT with monitor
OUT (PB EQ) e Video sweep (75 {2 load), supply a video sweep ny
(TP210) e AUTO without burst to VIDEO IN.
Frequency
TRACKING 2) Set recording video cassette into the cassette
: OFF housing. Record a video sweep signal without
@ SOURCE SEL burst in the SP mode.
: AUX 3) Connect an oscilloscope to VIDEO OUT.
e SP mode Play back recorded video sweep signal in the
SP mode, set the tracking of the Front panel to
the Auto tracking off position by simultane-
ously pressing the (+) and (—) tracking buttons.
3 scale i — apn ee 4) Use the control of the oscilloscope to position
the 100 kHz region at graduation 3 (0 dB) of
the oscilloscope scale.
100 3 MHz 5) Adjust R226 to position the 2 MHz of channel-
kHz 1MHz T:2ms/10 mV 1 portion at 2.4 — 3.0 (—1 + 1 dB) of the
oscilloscope graduations as shown in Fig. 2-5-4.
At this time, confirm that the channel differ-
ence is within 3 dB.
Fig. 2-5-4 PB frequency
e REC then PB Alternate method
e TV broadcast 1) Set recording video cassette into the cassette
e AUTO housing, receive a colour broadcast on a VHF
* TRACKING channel.
: OFF 2) Record a colour broadcast that shows a good
® SP mode depiction of human facial contours.
© SPURCE SEL 3) Play back recorded colour broadcast, set the
:AUX tracking of the Front panel to the Auto track -
ing off position by simultaneously pressing the
(+) and (—) tracking buttons.
4) Adjust R226 to obtain distinct facial features
on the monitor.
Note: R226 nearly at centre position.
1C251-18
(VIDEO
UNIT]
(VIDEO
UNIT
|
eSECAM
color
bar
“| board)
1) Connect an oscilloscope to pin 18 of 1C251.
2) Adjust LC251 so that A and B are related is
follows:
A:B=3:4=0.84 Vp-p: 1.11 Vp-p
A
2-6