....”
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,etc.:l OkHz)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
Connectswwp
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-