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Tuner Adjustment; Tape Deck Adjustment - Sanyo DC-D3 Service Manual

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TUNER
ADJUSTMENTS
TAPE
DECK
ADJUSTMENTS
Use
a plastic
screw
driver
for ad,ustmen;s.
.
Speaker
impedanCe
: 8 Ohm
Standard Output :
500mW
FM
MODE
switc.h
:STEREO
a.
PREPARATIONS
FOR ADJUSTMENTS
Measuring
instruments,
tools.
(1) Test tape
MTT-t t4M (10 kHz)
(4)
TCW-211 (1,500 Hz) (Optional)
MTT-111 (3,000 Hz)
(5)
AC-224 (NORMAL)
(6)
(2) Oscilloscope:
(Atleast 10MHz, dual channel)
(7)
(3) Oigital voltmeter (lnputimpedancel
ML20r more)
(8)
b.
H;ADREPLACEMENTAND
AZIMUTH
ADJUSTMENT
(a) Head replacement
Automatic
distortion
analyzer
or AC voltmeter
( - 80dB,
input
impedance
1 ML7 or more)
AF-oscillator
(400
Hz,500mV
RMS)
Frequency
counter
(5 MHz
or more)
Frequency
counter,
probe.
Screwdrivers
(non-metalic)
for adjustments.
L
~
TP209
R2124
rl
~~
AMPLIFIER/TuNER
PWB
TP206
C2134
7P205
R2130
12173
(1)
(2)
(3)
(4)
(b)
"(!)
-1.2)
(?3)
After
replacement,
demagnetize
the heads
by
using
a degausser.
Be sure
to clean
the heads
before
attempting
to
make
any
adjustments.
Besureboth
channels(l
and2)are
the same
level
(Using
a dual-channel
oscilloscope).
All wiring should be returned to the
origkal
position after work is completed.
1
1P203
,:
L&:,
c2103
1'
CT272
TP207
'It!
~2%
'2'72
C2156,
%,
#',
~,o;''r,~,
r-f
I
Uud
SG
RF
Level :75 ohm Open Voltage dB~V
Anlenha: 750hmunbalanced
direct, MocJulation:l
kHz.
a.
ADJUSTMENTS
OF
FM
BAND
Dev.
: ~ 22.5
kHz
(MONO)
~ 22.5
kHz(MAlN)
~ 6.75
kHz(PlLOT)
x
VTVM
Oscilloscope
or
DC voltmeter
Adjusting
I
Connections
Step
Position
of
Circuit
I
56 Frequency
Input
Adjustment
output
tuning
dial
Connect
swwp
IF
Connect
swwp
1
generatorto
generatorto
—
—
TP203(H),
TP204(G)
TP205(H).
TP206(G)
"
Connect
to Digital
Tuning
87.s MHz
Low
end
—
2
—
DC voltmeter
coverage
TP 201 (H), TP 202 (G)
108.0 MHz
High
end
—
Head
adjustment
4
0.9-1.4V
.
Iessthan
9 V
Load atesttape
in Tape Deck"A" (MTT-114N,e tc.:l Ok Hz)for
azimuth adjustment.
Press
the PLAY
button.
Use
a flat-tip
( - ) screwdriver
to turn
the screw
for normal
azimuth
adjustment
so that
the left and
right
outputs
are maxlmtzed
at the
same
phase
during
playback.
Press
the STOP
butfon.
Repeat
procedure
for Tape
Deck"
B".
After
completion
of the adjustment,
use thread
lock
(TB 1401 B) to
secure
the azimuth-adjustment
screws.
1
Connect
swwp
3
Trackjng
Connect
to VTVM
90.0 MHz
90.0 MHz
—
generator
to
TP207(H),
TP204(G)
speaker
outgut
106.0 MHz
106.0 MHz
.-
SG
Modulation
: 1 kHz,
30%
IRE
LooD
Antenna
].
ADJUSTMENTS
OF AM BAND
Step
1
2
3
—
Position
of
VTVM
SG Frequency
Adjustment
Oscilloscope
or
tuning
dial
DC voltmeter
a
'
(4)
(5)
(6)
.,
(1)
(2)
(3)
(4)
Adjusting
Connections
Circuit
Input
output
I
Connect
swwp
I
Connect
swwp
IF
generator
to
aeneratorto
—
I
I — h
ITP212(H).TPZ04(G)I
TP ~1
(H),TP
206(G)
522 kHz
Low
end
T2 t 73
1. O-1.4V
1710kHz
High
end
Iessthan
8.5 V
Vol Inwter
~b]
[E]
II
,hase&
0
Phase alignment
Prepare a dual-channel
oscilloscope.
Set
so that the left and
right
ranges
of the oscilloscope
are the same.
Play
the test tape
(MTT-114N,
etc.:
10 kH.z).
Adjust
so that the waveforms
for the
left and
right
channels
are in
alignment,
as shown
in the illustration.
Connect
AM SG to
Track, ng
Connect
to VTVM
Test Loop
(SG = 80dBpV)
speaker
output
-1o-
-11-
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