Sony TC-KA6ES Service Manual page 8

Tape Passing Adjustment
Note: For the following adjustments, use the jig as far as
possible. Although the following methods are operable
without using the jig, precise adjustment may not be
completed, for example no compatibility to other decks
is available even if self recording and playback is OK.
In these adjustments, either the pinch roller guide in
the S side or the record/playback head guide is referred
to for tape pass. Therefore, do not unnecessarily rotate
the adjustment screws including those of the erase
heads unless any one is replaced. When 2 or more
heads or pinch rollers out of these 2 heads and pinch
rollers are to be adjusted or replaced, use the jig for the
adjustments or replace one at first and then take
complete tape pass and then replace the second one.
Head height adjusting jig: apex
Preparation:
¢ Mirror cassette CQ009C 8-909-708-01
(Or CQ012C 8-909-708-02)
If it is not available, cut a part of the half of a 120 minute
cassette tape and use.
Cut and use.
¢ Plus screw driver
Medium size ...... Apply to the head adjusting screw.
Minus screw driver
Large size.......... Apply to the pinch roller adjusting
screw in the S side.
* Pen light
¢ WS-48B (3kHz, 0dB)
¢ P-4-A100 (l0kHz, —10dB)
Definition:
The following view relates to record/playback heads.
Height Thrust Azimuth
Tilting
For the locations of the adjusting screws, see the view
"adjustment location" in the lower right corner of Page 9.
Procedure:
Pinch roller in the S side
Note: It should be adjusted only when the pinch roller in the S
side is replaced.
1. Mount the mirror cassette and set the equipment to playback
state.
2. Check that the tape is curled in the pinch roller guide or the
guide of the record/playback heads.
If curled, remedy it by rotating the tape curl adjusting screw
@. At that time, check that the tape runs near the center
part of the erase heads.
Record/playback heads
Note: The heads should be adjusted only when the record/
playback head is replaced.
1. Mount the mirror cassette and set the equipment to playback
state.
2. (Height adjustment) Check that the tape is curled in the tape
guide of the heads. If curled, rotate screws ©, and@ in
the same angle and move the entire heads parallel. Check
the mirror cassette where there is curling and, when curling
exists in the lower side (actually in the deep side), tighten
all screws slightly. If curled in the upper (your) side, loosen
them.
| ' ' ' ,
Far side — ae —- Your side & F : os
Normal Curled in the Curled in
(record/playback far side. your side.
head viewed from
: Loosen screws
the erase head side)
Q,O and@.
Tighten screws
@, © and@.
3. (Adjustment of tilting) Adjust back tension to 0 still in
playback state (loosen the tape by rotating the reel in the S
side using a small tip such as a pencil), and check that there
is no curling or snaking (up or down) in the guide of the
record/playback heads. Snaking of the tape may occur only
within the range of a difference in the widths of the tape and
the tape guide (it curls when rate slacks more than the
range). Therefore, carefully check it because it may often be
overlooked.
If the tape is snaking, rotate screws @ and @ in the same
angle and change the tilting of the heads. Tighten or loosen
the screws to remedy up or down snaking, respectively.
4. Repeat the adjustment 2 and 3 again and converge the height
and tilting to suitable positions.
5. (Tentative adjustments of azimuth) Demagnetize and clean
the heads and playback WS-48B (3kHz, OdB).
Rotate the screw @ so that the pointer or the level meter of
the set or connected to LINE OUT becomes maximum. If
the screw is rotated more than 1/2 turn, repeat the
adjustments again from 1.
6. (Checking of tape pass) Connect an oscilloscope to LINE
OUT, replay P-4-A100 (l0kHz, —-10dB) to describe
Lissajous' figures.
At about 20 seconds after beginning playback (the tension in
the loop becomes stable), check that the variation of the
Lissajous' figures occur within £90° (more preferably within
+45°). If beyond +90°, adjustments of tilting or height will
not be complete, so finely adjust the equipment again from
1.
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