Teac V-909RX - Page 13

V-909RX/V-707RX/V-707R
5
ELECTRICAL
ADJUSTMENTS
AND
CHECKS
PrLIBOMECER
PRECAUTIONS
1.
Before
performing
adjustments
and
checks,
clean
and
demagnetize
the
entire
tape
path.
Make
sure
that
the
deck
is
properly
set
for
the
voltage
in
your
locality.
in
general,
adjustments
and
checks
should
be
made
in
the
order
of
forward
play
(or
record)
mode,
then
reverse
play
{or
record)
. OdB is referenced to 0.775 V. 1f an AC voltmeter that references
0 dB to 1 V is used, appropriate compensation should be made.
. The AC voltmeter used in the procedures must have an input
impedance of 1 Mohm or more.
. Note the “deck settings” at the top of each chart. The settings
apply to all checks for a specific chart unless explicitly started
mode,
and
in
the
order
of
the
L-ch
then
R-ch.
Double
ref.
Nos.
otherwise.
and
test
point
designations
indicate
L-ch/R-ch.
;
(Example: R11/R21)
OSCILLOSCOPE
OSCILLATOR
pistORTION
METER
ACVoltmeter
1kHz FILTER
ATTENUATOR
(Rd
OUTPUT
LINE
IN
a
Fig. 5-1 Basic test setup
(BARE)
5-1
PLAYBACK
PERFORMANCE
settings:
TAPE
SELECTOR
sw:
NR
systems
sw:
OUT
MPX
FIL:
OFF(or
OUT),
V-707R{V-909RX)
dbx
DISC:
OUT(V-909RX)
ITEM
|
PREPARATION/SETTING
|
1,
REC/PLAY
al
TEAC test tapes:
MTT-150: For Dolby level calibration
MTT-356:
For
playback
frequency
response
check
with
METAL,
CrO2
MTT-501:
ForS/N
check
with
NORMAL
INPUT
ADJUST
MEASURING
SIGNAL
(or
CHECK)
POINT:
RESULT
Check
REC/PLAY
head
azimuth
by
referring
to
section
4-7
on
pages
10
and
11.
METAL
REMARKS
azimuth
Bsomv
(-250R).
|)
Tor
V-7OZRX
[
Te
|
Dolby
TP.3/TP
A:
for
V-909RX/
388
mv
(—6
dB)
V-707R
R11/R21
See(Fig.
5-12)
Dolby
TP.1/TP.2:
:
FWD
play
mode
Z
e
Specified
OUTPUT:
setting
of
OUTPUT
cont.
|
"5
gp
(436
mv)
OUTPUT
cont.
MTT-150
2.
Playback
level
Dolby
TP.3/TP.4:
for
V-909RX/
388
mv
(—6
dB)
V-707R
R12/R22
Pan
[ever
REV play mode
OUTPUT:
—5 dB +1 dB
(388 mV to 489 mV)
;
IMPORTANT:
Do
not
move
the
OUTPUT
control
during
any
subsequent process.
13