Sony BVW-55 Maintenance Manual page 363

Check procedure
6. Turn the power on
7. Mode setting (REC head PB)
(1) Insert the CR2-1B into the unit.
(2) Press the PLAY button, and then press the
any button of the ASSEMBLE button and/or
INSERT buttons to establish the REC head
PB mode.
n
Ensure that the erasure prevention plug of the
alignment cassette-tape is pressed in.
8. Check the CTL head height
(Refer to Section 5-6.)
n
Be sure to check the CTL head position when the
CTL head height is adjusted.
9. Tape rising pressure check (S side)
(1) Check that D109 LED on the SV-206 board
is not light.
(2) Play back the CR2-1B.
(3) Turn the upper flange of the S2 guide coun-
terclockwise using a tape guide adjustment
driver so that 0.5 or 1 peak levels are ap-
peared in an RF signal waveform as shown in
the figure. At that time, check the following.
. Check that no clearance exists between the
upper flange of S2 guide and upper edge of
the tape.
. Check that clearance exists between the
flanges (upper and lower) of S4 guide and
the edges of the tape.
If they are not satisfied, perform the tape
running adjustment (refer to Section 5-4) and
video tracking adjustment (refer to steps 19 and
later) to meet both specifications.
(4) Turn the upper flange of S2 guide clockwise
so that the RF signal waveform is almost flat.
BVW-55 P2
. Alignment tape : CR2-1B
(D109 Dark)
Y RF (REC head PB)
(CH-1)
[Drum entrance side]
Impedance roller
Full-erase
Clearance exists
head
S4 S3
S tension regulator
5-5. Video Tracking Check and Adjustment
RF waveform
0.5 or 1 peak levels (upper)
Tape cleaner
No clearance exists
CTL
head
S2 Drum
S1
5-21