Technics RS-TR474

HEAD REPLACEMENT
When
replacing
the
R/P
head
or
E
head,
adjust
the
head
azimuth
(erase
head
with
small
screw
stop
does
not
need
adjustment)
then
start
the
EEPROM
adjustment
in
the
following
sequence.
;
(1) (2)
(4) (3)
(The
adjustment
is
necessary
because
the
playback
gain,
the
overall
gain,
and
the
overali
frequency
response
are
changed
by
the
head
replacement.)
HEAD AZIMUTH ADJUSTMENT (DECK 1/2)
4. Playback the azimuth adjustment portion (8kHz, —20dB)
of the test tape (QZZCFM). Vary the azimuth adjusting screw
until the output of the R-CH are maximized.
. Perform the same adjustment in the play mode.
. Repeat the same check in reverse play mode.
.
After
the
adjustment,
apply
screwlock
to
the
azimuth
adjust-
E.HEAD
R/P.
HEAD
ing screw.
pn
(playback) Azimuth Screw Azimuth Screw
: (Forward) (Reverse)
TAPE SPEED ADJUSTMENT (DECK 1/2)
Normal speed
1. Playback the middle portion of the test tape (Q2ZZCWAT).
2. Short the test terminal.
3. Adjust Deck 1=VR801 and Deck 2=VR803 so that the output is
within the standard value.
LINE OUT
Standard
value:
3000
+15Hz
(NORMAL
speed)
puis
requency
counter
High speed [Set the unit to forward (FWD) mode.]
4. Press the tape-to-tape recording-speed selector switch (X2) button.
This will set the high speed mode.
5. Playback the middle portion on the test tape (QZZCWAT).
6.
At
that
time,
check
if
the
output
from
DECK
1
is
within
the
standard
value.
Standard value: 6000+600Hz (HIGH speed)
.
Adjust
VR802
so
that
the
output
frequency
of
DECK
2
is
within
+30Hz
for
the
value
of
the
output
frequency
of
DECK
1.
.
Release
the
test
terminal.
PLAYBACK GAIN MEASUREMENT (DECK 1/2)
4.
Load
the
test
tape
(QZZCFM)
into
the
deck
and
locate
UNE
OUT
the
part
where
the
playback
gain
test
tone
(815Hz,
OdB)
is
recorded.
After
this,
play
back
the
tape
and
verify
that
the
output
level
fails
in
the
specified
range.
Standard value: 320mV+0.5d8
2.
If
outside
the
standard
value,
data
in
EEPROM
should
be
written
again
by
taking
the
following
procedure
and
there
thereafter
section
1
should
be
carried
out
again.
(1) (2) (3)
Step
1
on
page
19
Step
5
on
page
20
Step
10
on
page
21