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-