Aiwa CX-NAK772, Service Manual

Page: 38 / 46

ADJUSTMENT <TUNER / DECK>
< TUNER SECTION >
1. Clock Frequency Check
Settings : • Test point : TP2
Method : Set to AM 1602kHz and check that the test
point is 2052kHz ± 45Hz.
2. MW VT Adjustment
Settings : • Test point : TP1 (VT)
• Adjustment location : L981 (3/3)
Method : Set to MW 1710kHz and adjust L981 (3/3) so
that the test point becomes 7.5V ± 0.05V. Then
check that the test point is more than 0.3V
(530kHz).
3. SW VT Adjustment
Settings : • Test point : TP1 (VT)
• Adjustment location : L942
Method : Set to SW 17.9MHz, 5.9MHz and adjust L942
so that the test point becomes 6.0V ± 0.05V.
Then check that the test point is more than 0.3V
(5.9MHz).
4. FM VT Check
Settings : • Test point : TP1 (VT)
Method : Set to FM 87.5MHz, 108.0MHz and check that
the test point is more than 0.5V (87.5MHz) and
less than 8.0V (108.0MHz).
5. MW Tracking Adjustment
Settings : • Test point : TP8(Lch), TP9(Rch)
• Adjustment location :
L981 (1/3) .................................... 603kHz
TC941 .......................................... 1404kHz
Method : Set up TC941 to center before adjustment, the
level at 603kHz is adjust to maximum by L981
(1/3). Then the level at 1404kHz is adjust to
maximum by TC941.
6. SW Tracking Adjustment
Settings : • Test point : TP8(Lch), TP9(Rch)
• Adjustment location :
L941 .............................................. 5.9MHz
TC943 .......................................... 17.9MHz
Method : Set up TC943 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 TC943.
7. FM Tracking Check
Settings : • Test point : TP8(Lch), TP9(Rch)
Method : Set to FM 98.0MHz and check that the test point
is less than 9dB.
8. AM IF Adjustment
Settings : • Test point : TP8(Lch), TP9(Rch)
• Adjustment location :
L772 ............................................... 450kHz
SFR1
DECK–1 P,DECK-2 R/P/E HEAD
12
11
DECK C.B G
12
12
MAIN C.B A
L981
FFE801
SFR352
IC771
L771
TP4
30
TP1
(VT)
TP2
TP8 (LCH)
TP9 (RCH)
9
2
1
15
L772
TP3
(3/3) (1/3)
IC303
8
2
3
9
9
TP7 (RCH)
TP6 (LCH)
GND
SFR351
13
14
15
16
5
6
8
L941
TC943
TC941
L942
TP5
10
3 5
6
5
4
9
7
11
48
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