Aiwa NSX-SZ702, Service Manual

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1. Clock Frequency Check

Settings : • Test point : TP2 (CLK)

Method : Set  to AM 1710 kHz <HA>, AM 1602 kHz <HS>,

MW 1602 kHz <HT,EZ> and check that the test point is

2160 kHz ± 45 Hz <HA>, 2052 kHz ± 45 Hz

<HS,HT,EZ> .

2. AM (MW) VT Check <HA,HS,EZ>

Settings : • Test point : TP1 (VT)

Method : Set to AM 1710 kHz <HA>, AM 1602 kHz <HS>,

MW 1602 kHz <EZ> and check that the test point is less

than 8.5 V <HA,HS>, less than 8.0 V <EZ>. Then set to

AM 530 kHz <HA>, AM 531 kHz <HS>,

MW 531 kHz <EZ> and check that the test point is more

than 0.6 V.

3. MW VT Adjustment <HT>

Settings : • Test point : TP1 (VT)

• Adjustment location : L953

Method : Set to MW 1602 kHz and adjust L953 so that the test

point becomes 8.5 V ± 0.05 V. Then set to MW 531 kHz

and check that the test point is more than 0.3 V.

4. SW VT Adjustment <HT>

Settings : • Test point : TP1 (VT)

• Adjustment location : L942

Method : Set to SW 17.9 MHz and adjust L942 so that the test

point becomes 8.0 V ± 0.05 V. Then set to

SW 5.73 MHz and check that the test point is more than

0.3 V.

5. LW VT Adjustment <EZ>

Settings : • Test point : TP1 (VT)

• Adjustment location : L942

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

point becomes 1.3 V ± 0.05 V. Then set to

LW 290 kHz and check that the test point is less than

8.0 V.

6. AM (MW) Tracking Adjustment <HA,HS,EZ>

Settings : • Test point : TP5 (Lch), TP6 (Rch)

• Adjustment location : L951 (1/3)

Method : Set to AM 1000 kHz <HA>, AM 999 kHz <HS>,

MW 999 kHz <EZ> and adjust L951 (1/3) so that the

test point becomes maximum.

7. MW Tracking Adjustment <HT>

Settings : • Test point : TP5 (Lch), TP6 (Rch)

• Adjustment location :

L952..............................603 kHz

TC941..............................1404 kHz

Method :  Set up TC941 to center before adjustment. The level

               at 603 kHz is adjusted to MAX by L952. Then the

               level at 1404 kHz is adjusted to MAX by TC941.

8. SW Tracking Adjustment <HT>

Settings : • Test point : TP5 (Lch), TP6 (Rch)

• Adjustment location :

                      L941 .............................. 5.73 MHz

                      TC943 ........................... 17.9 MHz

Method : Set up TC943 to center before adjustment. The level at

5.73 MHz is adjusted to MAX by L941. Then the level

at 17.9 MHz is adjusted to MAX by TC943.

9. LW Tracking Adjustment <EZ>

Settings : • Test point : TP5 (Lch), TP6 (Rch)

< TUNER  SECTION >

ADJUSTMENT  <TUNER / DECK / FRONT>

• Adjustment location :

L941..............................144 kHz

TC942..............................290 kHz

Method : Set up TC942 to center before adjustment. The level at

144 kHz is adjusted to MAX by L941. Then the level

at 290 kHz is adjusted to MAX by TC942.

10. AM IF Adjustment

Settings : • Test point : TP5 (Lch), TP6 (Rch)

• Adjustment location :

L802..............................450 kHz

11. FM VT Adjustment <EXCEPT EZ>

Settings : • Test point : TP1 (VT)

• Adjustment location : L906

Method : Set to FM 108.0 MHz and adjust L906 so that the test

point becomes 7.0 V ± 0.1 V. Then set to FM 87.5 MHz

and check that the test point is more than 0.4 V.

12. FM VT Check <EZ>

Settings : • Test point : TP1 (VT)

Method : Set to FM 108.0 MHz and check that the test

point is less than 8.0 V. Then set to FM 87.5 MHz

and check that the test point is more than 0.5 V.

13. FM Tracking Adjustment <EXCEPT EZ>

Settings : • Test point : TP5 (Lch), TP6 (Rch)

• Adjustment location : L903

Method : Set to FM 87.5 MHz and adjust L903 so that the test

point is less than 9.0 dBµV.

14. FM Tracking Check <EZ>

Settings : • Test point : TP5 (Lch), TP6 (Rch)

Method : Set to FM 98.0 MHz and check that the test

point is less than 13 dBµV.

15. DC Balance / Mono Distortion Adjustment

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

             TP5 (Lch), TP6 (Rch) (Distortion)

• Adjustment location : L801

• Input level : 60 dBµV

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

between TP3 and TP4 becomes 0 V ± 300 mV.

Then check that the distortion is less than 1.2 %.

16. Output Level Check

<AM> <HA,HS>

Settings : • Test point : TP5 (Lch), TP6 (Rch)

• Input level: 74 dBµV

Method : Set to AM 1000 kHz <HA>, AM 999 kHz <HS> and

check that the test point is 40 mV ± 3 dB.

<MW> <HT,EZ>

Settings : • Test point : TP5 (Lch), TP6 (Rch)

• Input level: 74 dBµV

Method : Set to MW 999 kHz and check that the test point is

40 mV ± 3 dB.

<FM>

Settings : • Test point : TP5 (Lch), TP6 (Rch)

• Input level: 60 dBµV

Method : Set to FM 98.0 MHz and check that the test point is

140 mV ± 3 dB <EZ>, 200 mV ± 3 dB <EXCEPT EZ>.