Aiwa AD WX888 Service Manual

Page 1

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0 BASIC TAPE MECHANISM: (1-14

S/M Code No.89-063 DATE OF ISSUE 8/1989-I

AD-WX888

STEREO CASSETTE DECK

SPECIFICATIONS

Type Stereo cassette tape deck
Track lon'nat 4 tracks, 2 channels
Power supply AD-WX888E, Z
AC 220 V, 50/60 Hz
AD-WX888K
AC 240V, 50/60 HZ
AD-WXB88U, C
AC 120 v, 60 Hz
AD»W)(888H
AC 120 V1220 VIZ-10 V
switchable, 50/60 Hz
Power consumptlon
28 W
Frequency response
METAL tape: 20-18000 Hz
CrO2 tape: 20-17,DOO Hz
NORMAL taper 20-16,DOO HZ
Signal-to-noise ratio
73 d8 (METAL tape DOLBY C NFI
ON)
Wow and llutter Deck 1 (RE)
012% (according to DIN 45500)
0.065% (WRMS)
Deck 2
0.18% (according to DIN 45500)
006.5% (WFIMS)
Tape speed 4.8 cmlsec. 117/3 ips),
95 crnlsec (double speed)

AIWA Co., Ltd.

0 TYPE. H.U,C.E.K.Z

Recording system AC bias (frequency 105 kHz)

Erase system
Motor
Heads

Inputs

Outputs

Dimensions
Weight

AC erase

DC servomotor x 2
Record/playback head x 1 I
(PCVOCC coil pure amorphous
head)

Playback head x 1

'(PCOCC coil pure amorphous
head)

Erase head x 1

(Double-gap ferite head)

LINE IN maximum input
sensitivity: 50 mV (over 50 kn)
LINE OUT standard output level: ,
400 mV (0 VU); suitable load
impedance: over 50 k0

430M) x140(H)x 313m mm

54 kg

I Design and speCIficatians are subject to change without

not ice.

I Dolby noise reduction and HX Pro headroom extensmn
manufactured under license from Dolby Laboratories
Licensing Corporation. HX Pro originated by Bang I

Olufsen.

O Dolby". the double-D symbol. and HX PRO" are tradr
marks of Dolby Laboratories Licensmg Corporation.

Tokyo Japan

Printed in Japan

Page 2

Cautions when servicing

The power circuit in this unit incorporates an overcurrent During normal operation (03: OFF, 02: ON)

protector (shut-down circuit). When the overcurrent Since current I flowing to Rd is not large. Vl becomes
protector operates, voltages, V". Va: and Vref are not lower than 0.6V and 03 turns off. This causes 02 to turn
supplied. Once the overcurrent protector has operated, the on, and the voltage at point ® becomes about 12V, so
power circuit will not be recovered automatically when is VM and Vcc are output.

turned on, even after the cause of overcurrent is removed.

Perform the following procedure to recover the power When overcurrent occurs (03: ON, 02: OFF)
circuit. Uhen current I rises due to trouble on the VH and Vcc
1. Turn the power switch off. lines, Vl becomes higher than 0.6V and H3 turns on. This
2. Discharge C2 and C3 through a resistor of 1009 or causes 02 to turn off. and the voltage at point ®
more. (It takes about 5 seconds to discharge C2 and drops abnormally. so VM or Vcc is not output.

CB through a 1009 resistor.)
Note : It takes about 90 seconds to discharge if step 2

is not performed .

Operation of Overcurrent Protector

IC BLOCK DIAGRAM
IC,CX20187

REC IN-I Pa 194-: Pa FB-l GND-l SSK-l HPF H-I H 2.. W'rL-I 5..
CALJREC/ LINE TCH TCL HPF REC
Va: | REF PB REC Few OUT-l vr IN-l 2~1 L-
él-,%+--\'4 L-{EHZp-Q a

VCE CAL IN OFF/BIC REC LINE VF' IN'Z TCH 2'2 WT H2 TCL l-Z HPF LZ REC-Z
PB'Z DUT'Z OUT
END-2 SSK-2 HPF H-Z TEN 12 TCLZ-Z WTL-Z ANT S-Z

PB 4- 2 PB FE-Z

REC IN-2

Page 27

EXPLODED VIEW-3

REF. f- PART '0. i 7 DESCRIPTIOV
A 87-081-501-01 v T T +7. 5- t
B 86-575-243-01 MO T 0 Fl 5 c H 5w
c aT-usv-aaz-m sza-4. 7-0. 13
f D m-om-m-m Pw1.773. 54). 25
E n7-asT-3ao-o1 FWI.7- 7 -o.5
7 PCB-DIDECKH
- E
.
l
l
i
PART NO. REF. PART NO.
CHANGED T0 N0.
, 3.1 *86-535-291-210
' 3-2 *86-535-259410
33 86753572307310
3-4 *86-535-278-019
3-5 *86-575-220-010
3-6 *85-535-61441l0
_ 37 86753572337110
3-8 85-575-213~010
3-9 *36-535301110
310 *86575237010
3*] I *85575261019
342 *86-575-218-010
3-13 *86-575-210-110
3-14 *86757572427010
3-15 B6»575*203T010
- *86-535-255-010
3-17 8653572317210
3-18 86-575-201-010
- *86-535-288-019
, 3-20 *86~535*279T010
; 3-21 *86-535-260~310
722 *8675357308-110

3-23 *86-575-229-010
3-24 *86-535-261-310

DESCRIPTION

T-SPRJNG, FR CAM
GEAR. PLAY

LEVER, TRIGGER FR
T-SPRING, FR
GEAR. IDLER

RING, MAGNET
LEVER FR
SHAFT,FR

SLIP DISK ASSY
PULLY, MOTOR B

G CUSHION 5,5,1_35
HOLDER. MOTOR

BELT 1
G CUSHION DIAL3T973.L
FLYWHEEL F ASSY

RETAINERFLYWHEEL
LEVER. TRIGGER PLAY
FLYWHEEL R ASSY
C-SPRING, FLYWHEEL
TTSPRING, MAIN

CAM, MAIN
LEVER. CHANGE
LEVER. PAUSE B
CAM, FRP

27

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