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Panasonic RX-DT505 - Measurements and Adjustments; Tuner Section Alignment; Cassette Deck Section Alignment; Tape Speed Alignment

Panasonic RX-DT505
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RX-DT505
RX-DT505
m@
MEASUREMENTS
AND
ADJUSTMENTS
<TUNER
SECTION>
@
ALIGNMENT
INSTRUCTION
READ
CAREFULLY
BEFORE
ATTEMPTING
ALIGNMENT
eSet
power
source
voltage
to
15
VDC.
@Set
volume
control
to
5.
@
Set
power
switch
to
ON.
Output
of
signal
generator
should
be
no
higher
than
necessary
to
eSet
function
switch
to
TUNER/AM.
obtain
an
output
reading.
The
parts
other
than
the
ones
listed
below
are
aligned
at
the
factory
before
they
are
supplied.
la)
@AM-RF
ALIGNMENT
"alignment
of
those
parts
is
unnecessary
when
used
for
replacement.
SIGNAL
GENERATOR
or
INDICATOR
SWEEP
GENERATOR
RADIO
DIAL
(ELECTRONIC
ADJUSTMENT
REMARKS
SETTING
VOLTMETER
or
(Shown
in
Fig.
1.)
CONNECTIONS
FREQUENCY
OSCILLOSCOPE)
———-++
Headphones
Jack
Fashion
a
loop
of
(32Q)
(1)
L5-1
Adjust
for
maximum
output.
several
turns
of
wire
594
kHz
Tune
to
signal
Fabricate
the
plug
as
(AM
ANT
Coil)
Adjust
L5-1
by
moving
coil
and
radiate
a
signal
into
shown
in
Page
45
and
along
the
ferrite
core.
‘the
loop
ant.
of
receiver.
Tei
ois
measuring
instrument.
ei
eeae
cae
Cas
con
(oe
4
i
1503
kHz
i
.
onl
(ANEANT
Adjust
for
maximum
output.
Trimmer)
[ete
i
bE
(*1)
Fix
antenna
coil
with
wax
after
completing
alignment.
m@
LW-RF
ALIGNMENT
SIGNAL
GENERATOR
or
SWEEP
GENERATOR
RADIO
DIAL
SETTING
VOLTMETER
or
CONNECTIONS
FREQUENCY
OSCILLOSCOPE)
;
Headphones
Jack
Fashion
a
loop
of
(32Q)
(2)
L5-2
(AM
ANT
Adjust
for
maximum
output.
several
turns
of
wire
162
kHz
Tune
to
signal
Fabricate
the
plug
as
Coil
Adjust
L5-2
by
moving
coil
along
and
radiate
a
signal
into
shown
in
roe
a
and
ne
oil)
the
ferrite
core.
.
connect
the
lead
wires
01
the
loop
ant.
of
receiver.
the
plug
to
the
measuring
instrument.
INDICATOR
(ELECTRONIC
ADJUSTMENT
(Shown
in
Fig.
1.)
REMARKS
:
CT2
(AM
ANT
(*2)
Fix
antenna
coil
with
wax
after
completing
alignment.
<CASSETTE
DECK
SECTION>
e
ALIGNMENT
INSTRUCTION
READ
CAREFULLY
BEFORE
ATTEMPTING
ALIGNMENT
Set
volume
control
to
5.
Output
of
signal
generator
should
be
no
higher
than
necessary
to
obtain
an
output
reading.
;
¢Set
power
source
voltage
to
15
V
DC.
Set
power
switch
to
ON.
®Set
function
switch
to
TAPE.
ee
J
eHEAD
AZIMUTH
ALIGNMENT
INDICATOR
TEST
TAPE
‘ELECTRONIC
YOU
METER)
ADJUSTMENT
|
SPECIFICATION
REMARKS
(
or
OSCILLOSCOPE
Q2ZZCFM
Headphones
aes
was
Azimuth
Screw
1.
Playback
mode.
maximum
output.
(Shown
in
Fig.
2.)
Fabricate
the
plug
shown
in
Page
45
5
;
)
2.
Adjust
for
maximum
output.
(8
kHz,
—20
dB)
(
and
then
connect
the
lead
wires
of
the
plug
to
the
measuring
instrument.
~49-
@TAPE
SPEED
ALIGNMENT
INDICATOR
TEST
TAPE
(FREQUENCY
COUNTER)
ADJUSTMENT
REMARKS
1.
Short
the
test
point
and and
to
set
the
high
speed
mode.
DECK
2
2.
Insert
test
tape
(QZZCWAT)
in
DECK
1
and
start
playback
HIGH
SPEED
in
forward
direction.
sBeiears
VR301
eThis
frequency
is
defined
as
F.
DECK
1
3.
Insert
test
tape
(QZZCWAT)
in
DECK
2
and
start
playback
QZZCWAT
Headphones
Jack
(32Q)
NORMAL
in
forward
direction.
(3
kHz,
10
dB)
pen
cea
se
acl
in
ae
SPEED
....
|
4.
Adjust
VR301
until
the
frequency
is
set
to
F+40
Hz.
(nig
enioaniingucmumient..
Teese
VR303
|
5.
Open
the
test
point
and
(Grd.
and
to
set
DECK
2
the
normal
speed
mode.
NORMAL
6.
Insert
test
tape
(QZZCWAT)
in
DECK
1
and
start
playback
SPEED
....
in
forward
direction.
yg
Sad
VR302
|
7.
Adjust
VR303
until
the
frequency
is
set
to
3000+20
Hz.
(Shown
in
Fig.
3.)
|
8.
Insert
test
tape
(QZZCWAT)
in
DECK
2
and
start
playback
in
forward
direction.
9.
Adjust
VR302
until
the
frequency
is
set
to
3000+
20
Hz.
@®RECORD
BIAS
CHECK
|
INDICATOR
TEST
TAPE
ELECTRONIC
VOLTMETER
ADJUSTMENT
SPECIFICATION
|
REMARKS
}
or
OSCILLOSCOPE
ies
(+)
Use
CrOztapeand
|
FEW
(_)
CrOz...18.542MV
|
eRecord
mode
Normal...13+1
mV
Normal
tape
(Shown
in
Fig.
4.)
@
ALIGNMENT
POINT
Please
refer
to
Circuit
Board
and
Wiring
Connection
Diagram
for
test
point
locations.
LW
ANT
MW
ANT
162kHz
S594kHz
ia
|
is
P\
MW
ANT
LW
ANT
{SO
3SkHz
270kHz
a
es
fe
ea
fms
Toei
ee,
Se
Fig.
1
4)
1MQ
Bias
current
1kQ
output
point
DECK
1
|
NORMAL
|
FWD
REV
(-)
SPEED
TP123
|
aah
Fig.
2
Keep
these
cords
short.
(Line
capacitance:
3
pF
of
less)
ye
eee
ee
ee
eee
ees
cee
ee
—
e|n
order
not
ot
influence
the
bias
oscillation,
divide
the
:
voltage
with
1
MQ
and
1
kQ
resistors,
and
measure
Fig.
3
the
voltage
across
the
1
kQ
resistor.
Fig.
4
~50-

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