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ADJUSTMENT - 1 <TUNER / DECK>
MAIN C.B
—
TP10
FAs
IC301
ao
SFR306
TP7
DECK-—1 P, DECK-2 R/ P/E HEAD
< TUNER
SECTION >
1. Clock Frequency Check
Settings : * Test point : TP1 (CLK IC770 pin30)
Method : Set to MW 1710kHz (HE,LH,U), 1602kHz
(EZ), and check that the test point is
2160kHz + 45Hz (HE,LH,U), 2052
+0.045kHz (EZ).
MW VT Adjustment
Settings : * Test point : TP2 (VT)
¢ Adjustment location : L981 (1/2)
Method : Set to MW 1710kHz (HE), 531kHz
(EZ) and adjust L981 (1/2)
so that the test point is 8.5V + 0.05V (HE),
1.5V + 0.05V(EZ).
MW VT Check
Settings : ¢ Test point : TP2 (VT)
Method : Set to MW 530kHz (HE), 1710kHz (U,LH),
1602kHz (EZ) and check that the test point
is more than 0.3 (HE), 6.0V + 1.0V (U,LH),
less than 8.5 (EZ).
SW VT Adjustment <HE>
Settings : * Test point : TP2 (VT)
¢ Adjustment location : L942
Method : Set to SW 17.9MHz and adjust L942 so that
the test point is 7.0V + 0.05V.
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. LW VT Adjustment <EZ>
Settings : ¢ Test point : TP2 (VT)
« Adjustment location : L942
Method : Set to LW 144kHz and adjust L942 so that
the test point is 1.3V + 0.05V.
. FM VT Check
Settings : * Test point : TP2 (VT)
Method : Set to FM 87.5MHz, 108.0MHz and check
that the test point is more than 1.5V
(87.5MHz) and less than 8.5V (108.0MHz).
. MWTracking Adjustment <HE>
Settings : * Test point : TP6,TP7
¢ Adjustment location :
:
198 1:(2/2) cctiiieia
dc aactiuclndiiin 600kHz
COAT
sshiss sibeihectisstasdeasticbeousres 1400kHz
Method : Set up TC941 to center before
adjustment, the level at 600kHz is
adjust to maxmum by L981 (2/2).
Then the level at 1400kHz is adjust
to maximum by TC941.
10.
11.
12.
13.
SW Tracking Adjustment <HE>
Settings : « Test point : TP6,TP7
¢ Adjustment location :
LOAD 2s csesscsevsscvttnsensessineiageeniuestenes 5.9MHz
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17.9MHz
Method : Set up TC942 to center before adjustment. The
level at 5.9MHz is adjust to maximum by L941.
Then the level at 17.9MHz is adjust to maximum
by TC942.
LW Tracking Adjustment <EZ>
Settings : « Test point : TP6, TP7
¢ Adjustment location :
LOA Mos ch ccscetailnn
baie enesieieecsets 144kHz
Method : Set up TC942 to center before adjustment. The
level at 144kHz is adjust to maximum by L941.
Then the level at 290kHz is adjust to maximum
by TC942.
FM Tracking Check
Settings : ¢ Test point : TP6, TP7
Method : Set to FM 98.0MHz , and check that the test point is
2 + 6dB (HE,LH,U), 6 + 6dB (EZ).
DC Balance / Mono Distortion Adjustment
Settings : * Test point : TP3, TP4 (DC Balance)
: TP6, TP7 (Distortion)
¢ Adjustment location : L771
* Input level : 54dB
Method : Set to FM 98.0MHz and adjust L771 so
that the voltage between TP3 and TP4
becomes OV + 0.04V.
Next, check that the distortion is less than
1.3%.
Auto Stop Level Check
Settings : ¢ Test point : TP5
* Input level : Variable
Method : Set to FM 98.0MHz and check voltage low (about
0.1V). After that voltage high (about 7.0V) by 2dB
down and the level is 25 + 10dB.
Auto Stop Level Check
SW<HE>
¢ Input level : Variable
Method : Check auto stop at SW 12MHz and the level is
less than 60dB.
MW
¢ Input level : Variable
Method : Check auto stop at MW 999kHz (HE,EZ), MW
1000kHz (U,LH) and the level is
50 +10/-15dB.
¢ Input level : Variable
Method : Check auto stop at FM 98.0MHz and the level is
25 dB + 10 dB.
< DECK SECTION >
14. Tape Speed Adjustment
Settings : * Test tape : TTA—100
¢ Test point : TP8, TP9
¢ Adjustment location : SFR1
Method : Play back the test tape and adjust SFR1
so that the frequency counter reads 3000Hz
+ 5Hz.
15. Head Azimuth Adjustment
Settings : * Test tape : TTA—300
¢ Test point : TP8, TP9
¢ Adjustment location : Head azimuth
adjustment screw
Method : Play back the 10kHz signal of the test tape
and adjust screw so that the output becomes
maximum.
16. PB Frequency Response Check (DECK 1, DECK 2)
Settings : Test tape : TTA-—300
Test point : TP8, TP9
Method : Play back the 315Hz and 10kHz signals of
the test tape and check that the output ratio
of the 10kHz signal with respect to that of
the 315Hz signal is +2dB.
17. PB Sensitivity Adjustment (DECK 1, DECK 2)
Settings : * Test tape : TTA—200
¢ Test point : TP8, TP9
* Adjustment location:
SFR30i (DECK i, Lch)
SFR302 (DECK 1, Rch)
SFR303 (DECK 2, Lch)
SFR304 (DECK 2, Rch)
Method : Play back the test tape and adjust SFRs so that the
output level of the test point becomes 245mV.
18. REC/PB Frequency Response Adjustment
Settings : * Test tape : TTA-602
* Test point : TP8, TP9
* Input signal : 1kHz / 10kHz (LINE IN)
¢ Adjustment location:
SFR351 (Lch)
SFR352 (Rch)
Method: Apply a 1kHz signal and REC mode. Then adjust
OSC attenuator so that the output level at the TP8,
TP9 becomes 17mV. Record and play back the 1kHz
and 10kHz signals and adjust SFRs so that the output
of the 10kHz signals becomes OdB + 0.5dB with
respect to that of the 1kHz signal.
19. REC/PB Sensitivity Adjustment
Settings : * Test tape : TTA-602
* Test point : TP8, TP9
¢ Input signal : 1kHz (LINE IN)
¢ Adjustment location:
SFR305 (Lch)
SFR306 (Rch)
Method: Apply a 1kHz signal and REC mode. Then adjust
OSC attenuator so that the output level at the TP8,
TP9 becomes 17mV. Record and play back the 1kHz
signals and adjust SFRs so that the output becomes
17mV + 0.5dB.
20. Bias OSC Frequency Adjustment
Settings : * Test tape : TTA-615
* Test point : TP10
¢ Adjustment location : L351
Method : Set to the REC mode. Adjust L351 so that the
frequency at the test point is 85kHz + 1kHz.
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