Sony BVH-2000, Operation And Maintenance Manual

Page: 503 / 505

14-12. CONFIRMATION AFTER
ADJ ENT
Make a connection of the test equipments referring to section 8-
4 connection 1.
1
2-1. Tape Path Check Reverse Direction
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Record a color bar signal a few minutes. Place machine in JOG
mode and move at the beginning
of the recorded portion
slightly in the forward direction and stop the tape.
Set th~ VAR preset speed to about -6/30 (- 5/25 for
PAL/SECAM) with Program Jog mode.
Check that the waveforms at the beginning of the envelope
do not for about 5 seconds after the VAR button has
been pressed and immediately after tape has started to move
in the reverse direction .
If the waveforms change about 10%, the problem may be caused
by a defective S or T slant guide assembly which necessitates the
tape path adjustment.
2-2.
back the color bar recorded and while
switching
the tape speed with VAR +3, +2, + 1, + 1/5, 0, -1/5 and -1
check that the hue and brightness irregularity, white or
black stripes and dropouts do not result.
Take special care at the top and bottom of the picture and a
problem
may be caused by insufficient velocity compensator
adjustment of the TBC.
Check that the there is nothing wrong with the RF envelope and
picture when the machine is in transit between the reverse/STILL/
+ 1 speed/+ 3 speed modes.
Also check that there are no omissions at the top of the picture
during manual JOG mode.
Omissions
may be caused by a head wear or a defective
adiustment around the S or T slant
14-12-4. Reset System Check with Excessive
Speeds
With manual JOG mode, rotate the reel by hand, increase the
speed to more than -1 in order to disturb the DT operation,
release hand immediately
so as to set machine in still mode and
then check that the proper DT playback picture should appear
at the time.
the DT cannot be returned the problem
may be caused by the insufficient overlap of the video track.
14-12-5. Horizontal Shift Check
While playing back the color bar with -1 t 3 speeds,
check the picture on the monitor does not shift 140 nsec or
280 nsec (113 nsec or 226 nsec for PAL/SECAM) horizontally.
there is any shift, check the SKEW amount and interface
signals between the VTR and or past history (Refer to
sec. 2-10 "BVT-2000 Modification'") of the used.
14-12-6. Color Frame Shift Check
Feed an any signal with stable horizontal sync/subcarrier and
make a recording. Check that the color
framing
is locked with
the SC PHASE meter on the SR-15 board.
back the with normal speed and the CF
pot on the BVT-2000's SQ board.
Check that the picture does not shift up and down or left and
right when the VTR is changed in PLAY -.STILL .... PLAY
modes. This kind of symptom may occur when the early BVT-
2000 is used. Check the interface signals between the VTR and
TBC.
12-7. Check
Record a sports program or other which move
and play it back. When the mode is switched from + 1 speed to
still, check that the tape stops in about 0.2 sec and after stopping
the picture does not flow or the movements do not' return.
Check the access time when the mode is switched from still to
+ I speed. If there is any trouble, check the capstan and reel
servo systems (in particular,
motor and drive power supply
system).
14-6
BVH-2000(U/C)/PS/PM, BVH-2180(U/C)/PS/PM
BVH-2500(U/C)/P