Aiwa AD-R450 - service User manual

AIWA S/M Code No. 84-025
DATE OF ISSUE 9/1984
SERVICE MANUAL
STEREO CASSETTE
OECK
M O D E L I M O .
AD-R450
T Y P E . H B jH U B jH J B jC B jE B jK B jG B jZ
SPECIFICATIONS
Type
Track format
Power s pply
Power
cons mption
Freq ency
response
Signal-to-noise
ratio
Wow and fl tter
Tape speed
Rewind time
Fast forward time
Stereo cassette tape dec
4 trac s 2 channels
AD-R450 E, Z
AC 220 V, 50/60 Hz
AD-R450 K, G
AC 240 V, 50/60 Hz
AD-R450 U, C
AC 120 V, 60 Hz
AD-R450 H, HU, HJ
AC 120 V/220 V-240 V switchable,
50/60 Hz
15 W
METAL tape: 20-18,000 Hz
Cr02 position tape: 20— 17,000 Hz
NORMAL tape: 20-16,000 Hz
73 dB (METAL tape DOLBY C NR
ON)
According to DIN 45 500 0.1%
0.04% (WRMS)
4.8 cm/sec. (1 -7/8 tps)
70 sec. (C-60)
70 sec. (C-60)
Recording system
Erase system
Motor
Head
Inp ts
O tp ts
Dimensions
Weight
Accessories
AC bias (frequency 85 Hz)
AC erase
DC Servomotor x 1, DC Motor x 1
DX head
LINE IN maximum input
sensitivity: 50 mV (over 50 fi)
DIN max sensitivity (Z model only):
0.1 mV/ fi (3.3 fi)
LINE OUT standard output level:
0.4 V(0VU); suitable load
impedance: over50 fi;
DIN standard level (Z model only):
0.4 V(0VU)
Headphones: 8—32 ii
420(W) X110(H) x300(D) mm
4.4 g
Stereo pin cord (2)
Design and specifications are s bject to change witho t
notice.
Noise red ction system man fact red nder license
from Dolby Laboratories Licensing Corporation.
Dolby and the □□ symbol are trademarks of Dolby
laboratories licensing corporation.

Follow the instructions carefully, which will allow the user to optimise the products' performance
and ive many years of serivce.
1. No scratch and melting shall be made to covered tead-wires of an
a.c. primary circuit including mains leads.
2. No illegibility shall be given to the specification plate, the cau
tion labels, the fuse labels and others.
3. When, on pattern sides of circuit boards, additional repair-parts
have been made up, the parts shall be firm ly glued to circuit
boards or other components, unless the parts can be attached
firm ly.
4. The following matters shall be maintained as they are, when
repairing.
1) Soldering of lead-wire ends
* Care sho ld be taken of the space distance in an a.c. pri
mary circ it as well as soldering.
2) Wiring and holding of lead-wires with wire-clips and binders
3) Materials of lead-wires
*e.g.; For U L models, lead-wires to be sed shall be ap
proved or accepted by the UL.
4) Location of all kinds of ins lators
5) Setting 6f voltage selector switch
*Set the Voltage Selector Switch to 240V, 220V, or 120V,
According to yo r Local Voltage.
5. After repaired, the insulation resistance or lea age current shall
be measured w ith 500 ± 5V D.C and shall be not less than 1Mi2.
Meas ring Point
Connect to Chassis or O tside 0 of Pin Jack
Rating : More than 1MQ/500V DC Pin Ja c k (0 )
/ CD—
•4» ©
I vir
Chassis (G ) II
AC Power Cord(@ )
6. General instructions fo r mechanism repair
1) The heads, capstan and pinch roller shall be cleaned of good
q ality alcohol after repaired, beca se dirty heads shall ca se
distorted so nds while dirty capstan and pinch roller shall
occ r wow/fl tter and take- p fa lt.
2) When oiling, only one or two drops shall be applied so as
not to r n over and be dispersed. Note sho ld be taken of the
metal fitting for the capstan and rotating portions of the
idlers and pinch roller, especially.
3) E-rings and poly slider washers shall be replaced with new
ones, if once those have been removed. — No re- tilization
d e to nreliability.
4) Reg lar spare-parts shall always be sed for repair, beca se
sing irreg lar parts and tampering with the prod cts shall
ca se deterioration, m lf nction and damage.
2

AIWA®
ELECTRICAL MAIN PART LIST • *-mark means less req ired items and availabilities may be limited.
Symbol No. Part No. Description Symbol No. Part No. Description Symbol No. Part No. Description
< I C > < Ca p a cito r > J 881 ★87 049 297 JACK, 6.3a (HEADPHONES)
87 027 879 AN 6 8 8 2 C 301.302. 87 015 951 lxF 50V A S881 87 031 805 PUSH SWITCH (POWER)
87 020 260 BA 1 2 0 0 3 501.502 ELECTROLYT I C LL
87 020 261 LA 6 3 5 8 S C305.306 87 018 040 4 7 OpF CERAM I C < P I N J A C K C I R C U I T
(4) 82 197 641 LC 6 5 0 2 B 6 3 9 C 309,310, 87 018 044 1 0 0 OpF CERAMIC B O A R D S E C T I O N S
87 020 140 L 7 8M 1 2 701 = E >C C E R T E O R Z
87 027 895 M5 2 1 8 L C365.366 87 018 043 8 2 0 pF CERAMIC PCB E *PIN JACK CIRCUIT BOARD
87 927 986 N J M 4 5 6 0 S C 401,402 87 018 034 1 5 0 pF CERAMIC J 1.2.3.4 ★87 049 420 P I N JACK. 4P (LINE IN/
®87 027 937 TC 4 0 3 0 B P C411 87 014 071 3 9 0 OpF 100V P P REC. LINE OUT/PLAY)
C 413 87 018 137 3 3 0 OpF CERAMIC
< T R A JNT S I S T O R :> C505,506 87 010 231 2 2 0 nF 10V ELECTROLYTIC < V O L U M E C I R C U I T
82 109 521 2 S A 9 5 2 K C507,508 87 012 105 0 . 0 2 2 nF 16V CERAM I C B O A R D S E C T I O I\T >
89 110 155 2 SA 1 0 1 5GR C601 88 336 230 2 2 0 0 «F 25V ELECTROLYTIC PC B F *VOLUME CIRCUIT BOARD
89 309 457 2 SC 9 4 5 LK C602 87 010 232 2 2 0 w F 16V ELECTROLYTIC VR871 82 135 641 SLIDE VOLUME, 5 0kß A
89 318 156 2 SC 1 8 1 5 B L C603 87 010 049 3 3 0pF 5V ELECTROLYTIC (RECORD LEVEL)
89 318 155 2 SC 1 8 1 5 G R C606.607 89 663 815 0.0 1 wF 25V CERAM I C VR872 82 135 642 SLIDE VOLUME. 1 5 0kß W
89 322 406 2 S C 2 2 4 0 BL C704 87 010 139 4 7 </F 10V (REC BALANCE)
89 328 785 2 S C 2 8 7 8 A. B ELECTROLYTIC BP
89 408 805 2SD880GR < A U T O S T O R C I R C U I T
89 413 023 2 SD 1 3 0 2 S . T < D I S ¡ P L A Y C I R C U I T B O A R D S E C T I O N >
B O A R D S E C T I O IST > PCB G *AUTO STOP CIRCUIT BOARD
< M A I ÜNT C I R C U I T B O A R D PCB B *DISPLAY CIRCUIT BOARD C P L 901 87 045 644 PHOTO SENSOR. NJL5 1 4 1 E A
S E C T I O 1ST > D 801,802. 87 027 542 LED, LN2 1 7 RP ( 8 POI NT
PCB A *MAIN CIRCUIT BOARD 803,804. PEAK PROGRAM METER, < S E IST S O R C I R C U I T
D411.412, 87 027 097 D I ODE. 1 S 1 5 5 5 805,806, C TYPE, METAL) B O A R D S E C T I O 1ST >
413.414. 817.819 PCB H *SENSOR CIRCUIT BOARD
701.702. D 807.808. 87 027 543 LED, L N 3 1 7 G P (8POINT CPL902 87 045 644 PHOTO SENSOR, NJL5 1 4 1 E A
703.705 809.810, PEAK PROGRAM METER,
DG01.602. 82 596 799 DIODE. I N 4 0 0 2 (H, HU, H J , 811.812, B TYPE, NORMAL) < T E R M I N A L C I R C U I T
603.604. C . U only) 813.814. B O A R D S E C T I o isr >
706 815.816. = E . PC . G . Z only
D601.602. 87 027 083 DIODE, ISI 8 8 5 (E, K, G, Z 818.821 P C B I 82 135 607 TERMINAL CIRCUIT BOARD
603,604 only) D820 87 027 671 LED. LN4 1 7 YP (Cr02)
D704 87 020 123 DIODE. DS 4 4 6 D822.823 87 020 329 LED. S LP 2 8 4 C 5 1 U (► . < ) < D O E B Y ÜNT R C I R C U I T
L351.352 82 135 631 TRAP COIL, 8 5 K D824,825. 87 020 142 LED, SLP 9 8 4 A 5 1 B O A R 13 S E C T I O N S
L 353,354 87 003 109 COIL. 5 . 6 biH826 ( n . ; d . o > 87 020 132 DOLBY UN I T HA 1 2 0 5 8 J
L 401 82 194 632 BIAS OSC COIL. 8 5 K D827 87 027 097 DIODE, 1S 1 5 5 5 (W/PCB J )
L50f,502 82 135 632 M PX FILTER, 8 5 K
L701 82 196 649 O SC COIL, LC6502 < K E Y B O A R D C I R C U I T < D I N C I R C U I T B O A R D
S501 87 031 788 PUSH SWITCH (DOLBY B C B O A R D S E C T I O N > S E C T I O N > = Z only
NR ON/OFF) PCB C *KEY BOARD CIRCUIT BOARD PCB K 82 160 667 D IN CIRCUIT BOARD
S502 87 031 787 PUSH SWITCH (DOLBY NR D831.832 87 027 732 LED, S G 2 3 5 D (RVS PLAY, D21 87 020 123 DIODE. DS 4 4 6
B C SELECTOR) PLAY) R Y1 84 184 612 LEAD RELAY HA212N
S FR301, 87 021 734 SFR, 1 0 0Q B D833 87 027 733 LED, S Y 4 3 5 D (PAUSE) J 1.2.3.4. ★87 038 054 JACK PLATE A’ssy
302 D834.835 87 027 731 LED. SR53 5D (REC MUTE, 21, S 21 (LINE IN/REC. LINE O U T /
S FR351, 87 021 743 S FR , 2 2kQ B RECORD) PLAY, D 1 N REC/PLAY,
352. D84I.842, 87 027 097 DIODE, 1S 1 5 5 5 INPUT SELECTOR)
501, 843,844,
502 845,846, < Capacitor >
S FR353. 87 021 745 SFR, 4 7kQ B (Z only) 847,848, C3.4 87 018 040 4 7 OpF CERAM 1 C
354 849,850 C7,8 87 018 012 1 5 pF CERAM IC
S FR411 87 021 745 SFR, 4 7kQ B S 841 87 031 850 SLIDE SWITCH (REVERSE
412 MODE) < M I S C E L ]L A J S T E O U S >
VR401 82 135 643 VOLUME. 5 OkQ B S842 87 031 849 SLIDE SWITCH (TIMER) APT951 82 135 611 POWER TRANSFORMER
(BIAS FINE) S 843,844. 87 031 863 TACT SWITCH [REW (► ► ) ,(H, HU, HJ only)
845,846, F.F. (4 4 ) , PLAY, REV PLAY, APT951 82 135 612 POWER TRANSFORMER
< R e sis t o r >847,848, RECORD. STOP. PAUSE. (C. U only)
AFR601 87 029 361 3.3Q 1/2W 849.850 R EC MUTE] APT951 82 135 613 POWER TRANSFORMER
FUSE RES I STOR (E, Z only)
< S W I T C H C I R C U I T APT951 82 135 614 POWER TRANSFORMER
B O A R D S E C T I O !M >£(K , G only)
3PCB D 1jSWITCH C I RCUIT BOARD j RPH, EH ^ 81 50| 601 HEAD RP/E HD 4 2 5 RV
OJ-OÙ i-ltâ- Ö/ö

Symbol No. Part No. Descript ion
M901 87 045 135 MOTOR. DC/EG
M902 81 505 604 REEL MOTOR
S OL901.
902,
903
81 505 603 SOLENO I D, 9ME A
A★87 034 958 AC POWER CORD (H, HU, HJ
only)
A★87 034 578 AC POWER CORD (C, U only)
A★82 187 797 AC POWER CORD (E, Z only)
A★82 187 796 AC POWER CORD (K only)
A★82 187 795 AC POWER CORD (G only)
A★87 085 184 AC CORD BUSH I NG
(H. HU, H J , C, U only)
A★87 085 185 AC CORD BUSHING
(E, K, G, Z only)
S 901,904.
905 81 505 607 LEAF SWI TCHIREC ENA FWD, 'CASSETTE,REC ENA RVS)
S 902,903 81 505 602 LEAF SWITCH (70 (is/120 ws,
M T)
S 906,907.
908 81 505 601 LEAF SWITCHIPAUSE, PLAY, D 1RECTI ON)
AS 951 87 031 853 ROTARY SWITCH (VOLTAGE
SELECTOR) < H, HU, HJ only)
Note; Combination Circ it Board
The parts on the electrical parts list which are indicated by an
asterisk (*) are s pplied as one single combined circ it board.
Therefore, they will not be s pplied separately. If this becomes
necessary,please order the entire circ it board.
Combination circ it board 82-135-601
PCB-A 82-135-602
PCB-B 82-135-603
PCB-C 82-135-604
PCB-D 82-135-605
PCB-E 82-135-606
PCB-F 82-135-608
PCB-I 82-135-607
Combination circ it board 81-506-611
PCB-G 81-506-612
PCB-H 81-506-614
Safety component symbol
This symbol is given to important parts which serve to maintain
the safety of the prod ct, and which are made to conform to special
safety specifications. Therefore, when replacing a component with
this symbol, make absol tely s re that yo se a designated part.
C-MOS IC handling preca tion
The C-MOS IC's constr ction makes this part s sceptible to damage
by static electricity and so take s fficient care in regard to follow
ing articles.
1. Need to be p t on cond ctive sheet, to be p t in a metallic box
and to be wrapped by al mini m foil for transportation and
deposit.
2. To se solder iron less than 40W (less than 260 °C) of power
cons mption for soldering. B t do not overheat more than 10
second.
3. Do not perform a cond ctivity test with a tester, etc. Refer to
the circ it voltages of each part.
4. The ICs on the electrical parts which are indicated by an C-
MOS IC symbol mark ( ($> ).
5

I AD-R 450 ®; kb Bqb Jz ' CB'
P ract ical Service F* i ure
Wow and flutter:
Pinch roller pressure:
Take up torque:
F F and rewind torque:
Playback output:
(T T A 16 1)
R E C / P B output:
( 4 0 0 Hz, 0 V U,
T T A 1 1 9 J )
R E C / P B
distortion:
( 4 0 0 Hz)
Playback noise:
R E C / P B SN ratio:
(Unweighted)
(WTD A)
Erasing ratio:
( 1 2 5 Hz)
B ias frequency:
Frequency response:
According to D IN 45500 0
Less than 0.0 4 5 2$ (WRMS)
2 1 5 ± _2 5g ( 2 . 1 ± 0 . 2 4 N)
mN •
3 5 Í J 5 g-cm (3.4 íj'4 9
1 2 0 ~ 1 8 O-cm (1 1 . 8 ~ 1 7■ m)
6 mN m)
5 4 0 ± 2 OmV
[LINE OUT, D IN OUT (Z only)]
+ 0 . 5 ± 1 . OdB
[LINE OUT. D IN OUT (Z only)]
Less than 2. 5 % (NORMA L)
Less than 3. OmV (NORMAL,, 1 2 0 (iS ,
DOLBY NR OFF)
More than 45 dB (NORMAL, DOL B Y NR
OFF)
More than 45 dB (NORMAL, DOL B Y NR
OFF)
More than 5 5 dB
8 5kHz
3 0 ~
6 0 Hz 1 00 ~ 6 5 0 Hz 1 kHz 2 ~ 1 0kHz 1 3kHz 1 5 kHz 1 6kHz
METAL
■íjjdB ■ ±3dB
t
OdB • ±3dB
i 4 dB + 3 J D
4.6' B + ?dB
— 0
C r 0 2"1 .3dB + ?dB
— 0
NORMAL + ?dB
“ D
I nput level/
impedance:
Output level/
impedance:
Test tape:
LINE IN maximum input sensitivity:
5 0 mV (over 5 0 kQ)
D I N maximum sensitivity (Z only):
0 . 1 mV/kQ (3.3 kQ)
LINE O U T standard output level: 0.4V (0 VU),
suitable load impedance:over 5 0 kQ
D IN standard level (Z only): 0.4 V (0 V U)
Headphones: 8 — 3 2 Q
METAL TT A 1 1 9 MX
NORMAL TT A 1 1 9 J
C r0 2 T T A 1 1 9 G
G

SCHEMATIC DIAGRAM-1 (AD-R450 HB, HUB, HJB, CB, EB, KB, GB, Z models)
1 I 2 | 3 | 4 | 5 I 6 10 11 12 13 14 15 16
Om a in c.e
KEY BOARD
C.B
C0N8

15
JACK C.B
16 17 18 19 20 21
5V
0
IOV
0
22 I23
I50msec
24 25 | 26 27 28 29 30
STOP — PLAY PLAY STOP
5V
5V
0
(OV
0
STOP ^ FF FF > STOP
IOV
0
//
5)
100msec
i—
“““ nf ^ 1 1 1
\ ---- ii ---- 1
STOP PLA Y
5 V
0
FLAY ^STOP
0.5msec
5 V
0r
5V
4.4V
5V
0
3.2 m sec
a .
©
5V
0
5 V
0
5 V
O
IOV
0
lOm sec
UIMJUmJL
|LEADER TAPE LEADER TAPE
T = 0.2 ~ 5 sec
. i 2yk sec
NOTES:
1) | _____ B (+) power s pply
2) Signal path
^ Rec path
3) The voltage is the reference val e meas red with a
tester (20 k-ohms/V DC) when there are no signals.
B t ( ) is with recording.
An asterisk (*) indicates that the val e was meas red
with a vac m-t be voltmeter d ring recording.
4) Resistors with no designation have a rated power of
1/8W and a tolerance of ±5%.
5) Capacitors with no designation have a dielectric strength
of less than 50WV.
6) The only capacitor tolerance indicated are ±5% (J)
and ±10% (K).
7) Ceramic capacitor symbols:
-^l— For temperat re compensation (SL)
—I hr High dielectric constant system (YY)
—II— High dielectric constant system (YW, YP, YZ)
— I— Semicond ctor ceramic
-®)l— For temperat re compensation (SH)
8) Explanation of symbols
(@) Mylar capacitor
® Al min m solid capacitor
(05 Polypropylene film capacitor
(@£5 Bi-polarized capacitor
C p Low-leakage capacitor
E2i Printed resistor
-MW- F se resistor
Safety component symbol
This symbol is given to important parts which serve to
maintain the safety of the prod ct, and which are made
to conform to special safety specifications.
Therefore, when replacing a component with this
symbol, make absol tely s re that yo se a designat
ed part.
• This schematic diagram is s bject to change witho t
notice in the interests of improved performance.
2SA952
2SA1015
2SC945
2SC1815
2SC2240
2SC2878
2SD1302
1 □

WIRING-1 (AD-R450 HB, HUB, HJB, CB, EB, KB, GB, Z models)
1 l 2 I 3 I 4 I 5 10 12 13 14 15 16 17
FROM C0N9 PT951
[A] MAIN C.B
RIBBO N CORD I
El
SWITCH C.B
RIBBON CORO I
PIN JACK C.B
► RIBBON CORO II
S50I
DOLBY B-C
NR ON/OFF
S502
DOLBY NR B-C
SELECTOR
NOTES (1)
(2)H m Earth pattern if f lj j Printed resistor pattern HM !O th ers pattern
The volta e is the reference value measured with a tester (20 K ohms/V DC) when there are no si nals.
An asterisk (*) indicates that the value was measured with a vacuum-tube voltmeter durin recordin .
11 The ICs on the electrical parts which are indicated by an C- MOS IC symbol mark ( ).
12

WIRING-2 (AD-R450 HB, HUB, HJB, CB, EB, KB, GB, Z models)
1 ! 2 I 3 I 4 I 5 t 6 I 7 I 8 I 9 | 10 | 11 I 12 I 13 | 14 | 15 | 16 | 17 | 18 I _____ 19 [
1=3 DISPLAY C.B
C0N8 S845.D832 |< PLÀyI
S848 I STOPI S846.D83I r> REV PLŸ1 S843 ( M> | S842 I tÍMERIS847.D835 IRECORDI
S850.D834 IREC MUTEl
S844 I QQ 1
S849.D833 I PAUSE 1
S841
r e v e r s e m ode 1 [cl KEY board c. bCHASSIS EARTH CHASSIS EARTH
[k] DIN C. B (Z ONLY)
-sa.4a.
DS4b
Sec
0MAIN C.B
RIBBON CORD III
ES MAIN C.B
RIBBON CORD I
□ TERMINAL C.B
(E, G, K, Z ONLY)
<ORG
INPUT
SELECTOR LINE OUT/ PLAY DIN REC/PLAY
C0N4
0 MAIN C.B
< BRN>
S904
(CASSETTE) S903 q^ S902
(METAL) (STOP PLAY)(70>is/ I20jjs )
8.8~9.IV
— ----- (RWD, FF)
M902 M901
S90I
(REC ENA. FWD.) (H , HU, HJ MODELS ONLY)
RPH90J/EH90I
(R/P/E HEAD) VOLTAGE
SELECTOR
(CAPSTAN\
I MOTOR )
f REE L \
i m o t or;
>20~240V
C0N9 E SWITCH C.B
120V
S907
(PLAY)
L J S0L902
(PLAY)
S906
(PAUSE)
SOL90I(R VS)
S908
(DIRECTION)
S0L903
(PAUSE)
MECHA
EARTH AC 120V/220V/240V
50/60HZ (H.H U.HJ ONLY)
( U,C,E, K.G.Z MODELS ONLY)
(E,Z ,K ONLY)
(G ONLY) -veo
(U,C ONLY) CON 9
E SWITCH C.B
<?ÜÑ"¡
To BM AIN C.B
C0N2 C0N3
ToHMAIN C.B C0N7
ToHMAIN C.B
5^ % IG0NLY)
S Ä (K °NLY)
ED SENSOR C.B
CPL90I
ED AUTO STOP C.B AC220V ip 7 ONLY)
50/60HZ UNLT '
NOTES (1) l ll ff l Earth pattern H iiH I Printed resistor pattern M M Others pattern
(2) The volta e is the reference value measured with a tester (20 K ohms/V DC) when there are no si nals.
An asterisk (*) indicates that the value was measured with a vacuum-tube voltmeter durin recordin . I T = E o ^ d t (U,C ONLY)

SCHEMATIC DIAGRAM-2 (AD-R450 HB, HUB, HJB, CB, EB, KB, GB, Z models)
_____ 1 I 2 _______ I ________ 2 _______ | ________ 4 _____ J ________ 5 _______ 1 6
A
10 11 12
17 18