Denon AVR-3803S Service Manual

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18
ADJUSTING AND CHECKING THE
MECHANISM SECTION
1. Exchanging pinch roller
Before exchanging the pinch roller, clean the tape contact sur-
faces of the pinch roller and of the capstan shaft.
Defects on tape playing are primarily caused by a dirty pinch
roller or capstan shaft.
The right pinch roller arm can be detached by removing
the washer . The left pinch rolier arm can be
taken out by removing The spring and the nylon nut
& exchanging the pinch roller, run a tape without a C-90 butt
and verify that no tape curling occurs at the tape guide and
the tape guide part on the record/playback head.
Normal condition
Pinch roller L
“ Tape guide / / /
if / Pinch roller R
Nylon nut Erasure head / Recording/Playback head
Special nut
Defective running condition
Curl
2. Verifying pinch roller crimping
in the playback condition, hook a stick type spring balance to the
bracket on the central axis of the pinch roller. After pulling the
pinch rolier away from the capstan shaft, let the pinch roller con-
tact the capstan shaft as it is and verify that the readings on the
stick type spring balance are 250 to 350 g on the right side and
70 to 150 g on the left when the pinch roller starts turning. If the
readings exceed the standard values, replace spring or
right pinch roller C4) :
Capstan shaft
250 ~350 g (Take up) Right
70~150 g (Supply) Left
3. Exchanging recording/playback head aD
Detach the front panel first.
3-1 Dismounting recording/playback head
(1) Detach the recording/playback head locking screw :
(2) Remove soldering on the head wire and separate the me-
chanical unit to dismount the recording/playback head.
3-2 Recording/playback head installation
Assembly is the reverse of the installation procedure de-
scribed in section 3-1. The soldering for the head wire is
performed as shown in following Figure.
\
qi @®Dheignt adjustment
a screw
azimuth adjustment
screw
tilt adjustment
screw
YELLOW YELLOW
Co]
reo
WHITE
=yle
ex
|
BLACK
|
pf
YELLOW YELLOW
(| WHITE O20 00 GRAY [__1
WHITE = WHITE
4. Recording/playback head Adjustment
Height adjustment (adjust with head adjustment jig
THG-801)
(1) Set THG-801 (jig board) on the mechanical unit and perform
the adjustment by turning the special height adjustment
screw so the 3.8 mm part on THG-8011 (lig shaft)
can move without touching the tape guide on the recording/
playback head i
(2) Turn the azimuth adjusting screw so that the
recording/playback head does not tilt whileadjusting the
height, and make a rough visual adjustment.
4-2 Adjustment of tilt angle
(1) Set THG-801 (jig board) in the mechanical unit and place .
THG-801 (jig shaft) on the recording head to inspect the
gap between the jig board. If the jig shaft is tilted forward,
the tilt screw is too tight. Loosen it slightly and
adjust the tilt screw until the jig stick is parallel to
the jig board and the gap is completely eliminated.
(2) Readjusting the tilt may cause the height adjustment to slip.
After adjusting the tilt, be sure to verify the height.
If
the
height
is
misaligned,
turn
the
special
height
adjustment
screw and the tilt screw to the same angle
to shift the recording/playback head so it is parallel to the jig
board for height readjustment. After the adjustment is
completed, tighten the lock nuts.
£
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Denon AVR-3803S Specifications

General

Brand	Denon
Model	AVR-3803S
Category	Tape Deck
Language	English