Aiwa NS XA50 Service Manual

Page 2

, TABLE OF CONTENTS

SPECIFICATIONS ................................... ; ................................................................................ ....a 4
PROTECTION OF EYES FROM LASER BEAM DURING SERVICING
. PRECAUTION T0 REPLACE OPTICAL BLOCK .....
ELECTRICAL MAIN PARTS LIST
TRANSISTOR ILLUSTRATION
BLOCK DIAGRAM ...................
WIRING - 1 (MAIN :A50U,A54U) ..
SCHEMATIC DIAGRAM-1 (MAIN:A50U,A54U).
SCHEMATIO DIAGRAM -2 (MAIN : A51 U)
WIRING-2 (MAIN2A51U) ..
WIRING - 3 (MAIN: LH)...
SOHEMATIC DIAGRAM -3 (MAIN :LH).
SCHEMATIC DIAGRAM-4 (MAIN : HR).
WIRING-4 (MAIN : HR) ...........................
WIRING- 5 (FRONT : A50U,A54U) ............................
SCHEMATIC DIAGRAM- 5 (FRONT : A50U,A54U).
SCHEMATIC DIAGRAM - s (FRONT : A51U,LH,HR)
WIRING - e (FRONT 5 A51 U,LH,HR) ..........................
SCHEMATIC DIAGRAM - 7 (TUNER FRONT END) ..
WIRING-7 (AC) .....................................................
WIRING-8 (DECK) ...............................................
FL GRID ASSIGNMENT & ANODE CONNECTION.
IC BLOCK DIAGRAM-1
IC DESCRIPTION .............
IC BLOCK DIAGRAM-2.
ADJUSTMENT ...................
PRACTICAL SERVICE FIGURE.
MECHANICAL EXPLODED VIEW 1/1
MECHANICAL PARTS LIST 1/1 .....
ACCESSORIES / PACKAGE LIST ...................
TAPE MECHANISM EXPLODED VIEW 1/1
TAPE MECHANISM PARTS LIST 1/1 ,.
SPEAKER PARTS LIST ..............................
SPRING APPLICATION POSITION ..
REFERENCE NAME LIST .................

Page 35

ADJUSTMENT

I MAIN C.B

- T0942
@5351 a
_cam [0,7030 L931: 3
Mg l@-@

SFR302 SFR303
SFR304 Tm

SFH301 (9 FFEBO1
H TP8 RCH ° 9
TP3 :9
9
0

DECK 0.8

2:
as

Q

< TUNER SECTION >

1.

Clock Check

Settings : - Test point : TPl

Method : Set to MW l710kHz and check that the test point is
2160kl-lz i 0.045Hz.

AM(MW) VT Check (LH,ASOU,A51U,AS4U)

Settings : - Test point : TPB (VT)

Method : Set to AM l710kHz and check that the test point is
6.0V i 1.0V,

MW VT Adjustment (HR)

Settings : - Test point : TP3 (VT)
- Adjustment location : L981

Method: Set to MW 1710kl-lz and adjust L981 so that the test
point becomes 8.5V i 0.05V, Then set to MW
S30kHz and check that the test point is
more than 0.3V.

-54-

5.

DECK-1 P, DECK-2 R l P / E HEAD

@ Q
s 65

AM(MW) Tracking Adjustment

Settings : - Test point : TF7, TPS

- Adjustment location :
L981 IOOOkHz [LH,A50U,A51U,A54U]
L981 SOOkHz [HR]
TC941 1400kHz [HR]

Method : The level at lOOOkl-lz is adjusted to MAX by
L981. [LH,A50U,A51U,A54U]
Set up TC941 to center before adjustment. The level
at 600 kHz is adjusted to MAX by 1381 Then the
level at 1400 kHz is adjusted to MAX by
TC94L[HR]

FM VT Check

Settings: - Test point : 'l'PB (VT)

Method : Set to FM 108.0Ml-lz and check that the test point is
less than 8.5V.
Set to FM 875MHz and check that the test point is
more than 1.5V.