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4) If the
above
requirements
are
not
met,
make
adjustment (2)-B screw. (2)-A and (2)-B. Turn them
Note: Do not move the T-fixed guide.
5) Check that the height of the A/C head is as shown in
Figure 24 in relation to the tape.
@ When the tape travels smoothly around the A/C head
and coarse
adjustment
of its height is complete,
adjust head height and azimuth next.
TAPE TRAVEL ADJUSTMENT
Co
10.
V-head lead clamping O'
plate
. Adjust and check the height of the reel disks with the
master plane and the reel height adjustment jig.
. Check and adjust the height of the SI rollers and the
stationary
guides,
using the stationary
guide height
adjustment jig.
. Check the position and verticality of the tension of the
tension poles, using a tension pole position adjustment
jig.
. Set a rough adjustment tape in PLAY, and carry out
rough adjustment of the height of the guide rollers with
a flat-bladed screwdriver, so the lower edge of the tape
lies along the drum's lead.
Also, check that the video tape does not curl on the
flanges of the T and S guide rollers.
. Play a standard tape and finely adjust the height of the
guide rollers so that the envelope is flat, and is not
excessively adversely affected even when the tracking
knobs are rotated.
. Perform audio adjustments according to Adjustment on
page 13) as previously mentioned.
. Set the tracking knob to a preset position and adjust
the X position adjustment nut shown in Fig. 23(b) so
that the RF envelope is maximum
on the CHI side.
. Adjust the switch point to 6.5 + 0.5H.
. Confirm the flatness of the RF envelope and the sound
with manual recording the reproduction.
Apply asetscrew to each adjustment screw and nut after
adjustment completion.
Video head (2-CH)-
Lead (red)
p-~—-
® Screw (3P+4S)
Ors
Lead (yellow)
®— (Per —
@
-Hezore
® Fey with flat washer
—
—
_
W3P+9S
0 \ ox ax) oe
Lead (brown)
Video head (1-CH)
Figure 26.
UPPER DRUM REPLACEMENT
Replacement
1) Remove two fastening screws (5) (3P + 4S) with a
screwdriver.
2) Remove V-head lead retaining plate (6).
3) Unsolder two leads (1) (yellow) and remove them.
4) Unsolder lead (2) (red) and remove it.
5) Unsolder lead (3) (brown) and remove it.
14
6) Remove two fastening screws with flat washer (4)
(W3P + 9S) with a screwdriver.
7) Remove the upper drum upward and replace it.
Precaution:
Do not touch the drum surface directly by hand.
Reassembly
1) Install the replacing drum as shown in Figure 26 and
direct it so that the leads of specific colors come just
as illustrated.
Precaution:
Connect the yellow and brown leads to CH-1 and the
red and yellow leads to CH-2.
2) Fix the upper drum with two screws (4).
3) Solder leads (1), (2), and (3) to the proper locations.
Precaution:
Solder leads in a short time. Check that there are no
scratches on the round and end surfaces of the disk
and the inside and end surfaces of the upper drum.
Do not admit dust into the drum.
4) Fasten VH lead retaining plate (6) with screw (5).
5) After replacement is complete, be sure to perform
check and adjustment of tape travel and electrical
adjustment of the following items.
(1) Adjustment of playback switching point
(2) Adjustment of record switching point
(3) Check of tracking preset
(4) Check of tracking control
(5) Check of head resonance and Q
(6) Check of FM channel balance
GUIDE ROLLER ADJUSTMENT
© Video tape setting
1) Remove the upper enclosure.
2) Load the alignment tape in the cassette housing.
3) Plug the power cord, monitor output cord, and video
input cord to the proper locations.
4) Connect
CH-1
of an oscilloscope to RF envelop
output TP308 and CH-2 to switching pulse TP309.
5) Depress the play button.
Waveform observed at
Envelope
oscilloscope CH-1
(TP-308)
Waveform observed at
SW pulse
oscilloscope CH-2
(TP-309)
Figure 27.
Adjustment
1) Screw
the guide
roller
set screw
for maximum
tightness but that it can be turned with the guide
roller adjusting screwdriver with a moderate force.
2) Observe envelope by triggering with SW py Ise (see
Figure 27).
3) Looking at the envelope adjust guide roller height so
that the tape runs along the drum lead. The anvelope
waveform will appear as shown in Figures 2{ or 29 if
the video tdpe runs above or below the helical lead
position.
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