Aiwa NSX-BL44, Service Manual

30

29

ADJUSTMENT

 11

DECK-2 R/P HEAD

FWD

FRONT  C.B 

IC201

FL401

GND

TP7

16

16

L331

C326

1

R268

+

30

11

REV

FWD

DECK-1 P HEAD 

11

10

SFR1

DECK  C.B

 11

REV

MAIN  C.B

L951

SFR451 SFR452

L801

TP2 (CLK)

TP4  (DC BALANCE)

GND

TP8 (RCH)

TP9 (LCH)

10

 2

L802

L942

L941

TC942

9

5

TP1 (VT)

(3/3) (1/3)

FFE831

TP3  (DC BALANCE)

8

1

3

4

3

5

6

7

8

9

11

12

13

14

15

9

6

14

IC801

< 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 Check

Settings : • Test point : TP1 (VT)
Method : Set to MW 1602kHz, 531kHz and check that the

test point is less than 8.0V (1602kHz) and more
than 0.6V (531kHz).

3. LW VT Adjustment

Settings : • Test point : TP1 (VT)

• Adjustment location: L942

Method : Set to LW 144kHz and adjust L942 so that the test

point is 1.3V 

±

 0.05V.

Then set to LW 290kHz and check that the test
point is less than 8.0V.

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 :
L951(1/3) ...................................... 999kHz

Method : Set to MW 999kHz and adjust L951(1/3) so that the

level at the test point becomes maximum.

6. LW Tracking Adjustment

Settings : • Test point : TP8(Lch), TP9(Rch)

• Adjustment location : L941, TC942

Method : Set up TC942 to center position.

Set to LW 144kHz and adjust L941 so that the level
at test point becomes maximum.
Then set to LW 290kHz and adjust TC942 so that
the level at test point becomes maximum.

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 13dB

µ

V.

8. AM IF Adjustment

Settings : • Test point : TP8(Lch), TP9(Rch)

• Adjustment location :
L802 ............................................. 999kHz

9. DC Balance / Mono Distortion Adjustment

Settings : • Test point : TP3, TP4 (DC Balance)

: TP8(Lch), TP9(Rch) (Distortion)

• Adjustment location : L801
• Input level : 60dB

µ

V

Method : Set to FM 98.0MHz and adjust L801 so that the

voltage between TP3 and TP4 becomes 0V 

±

 0.3V.

Next, check that the distortion is less than 1.3%.

< DECK SECTION >
10. Tape Speed Adjustment (DECK 2)

Settings : • Test tape : TTA–100

• Test point : TP8(Lch), TP9(Rch)
• Adjustment location : SFR1

Method : Play back the test tape and adjust SFR1 so that the

frequency counter reads 3000Hz 

±

 5Hz and 

±

45Hz

(REV) with respect to forward speed.

11. Head Azimuth Adjustment (DECK 1, DECK 2)

Settings : • Test tape : TTA–330

• Test point : TP8(Lch), TP9(Rch)
• Adjustment location : Head azimuth

          adjustment screw

Method : Play back (FWD) the 8kHz signal of the test tape

and adjust screw so that the output becomes
maximum. Next, perform on REV PLAY mode.

12. PB Frequency Response Check (DECK 1, DECK 2)

Settings : • Test tape : TTA–300

• Test point :TP8(Lch), TP9(Rch)

Method : Play back the 315Hz and 8kHz signals of the test

tape and check that the output ratio of the 8kHz
signal with respect to that of the 315Hz signal is
within 5dB.

13. PB Sensitivity Check (DECK 1, DECK 2)

Settings : • Test tape : TTA–200

• Test point : TP8(Lch), TP9(Rch)

Method : Play back the test tape and check that the output

level of the test point is 140mV 

±

 3dB.

14. REC/PB Frequency Response Adjustment (DECK 2)

Settings : • Test tape : TTA–602

• Test point : TP8(Lch), TP9(Rch)
• Input signal : 1kHz / 8kHz (LINE IN)
• Adjustment location : SFR451 (Lch)

SFR452 (Rch)

Method : Apply a 1kHz signal and REC mode. Then adjust

OSC attenuator so that the output level at the TP8,
TP9 becomes -20VU. Record and play back the
1kHz and 8kHz signals and adjust SFRs so that the
output of the 8kHz signals becomes 0dB 

±

 0.5dB

with respect to that of the 1kHz signal.

15. REC/PB Sensitivity Check (DECK 2)

Settings : • Test tape : TTA–602

• Test point : TP8(Lch), TP9(Rch)
• Input signal : 1kHz (LINE IN)

Method : Apply a 1kHz signal and REC mode. Then adjust

OSC attenuator so that the output level at TP8, TP9
becomes 0VU. Record and play back the 1kHz
signals and check that the output is –2dB 

±

 3.0dB.

< FRONT SECTION >
16.

µ

-CON OSC Adjustment

Settings : • Test point : TP7 and GND

• Adjustment location : L331

Method : Insert AC plug while pressing POWER and TUNER

function keys. Adjust L331 so that the frequency
atthe test point is 153.84Hz 

±

 0.15Hz.