Onkyo TAW 88 Service Manual

Page 1

SERIAL NO. 3121

ONKYO@ SERVICE MANUAL
STEREO CASSEITE

TAPE DECK
Model TA-W88

TABLE OF CONTENTS

Item Page

Specifications

Cautions

Block diagram
Component location
Parts list

Disassembling procedures
Exploded View
Mechanism operation

uaxu-xrswruw

Adjustment procedures 8
Tape l-Exploded View ll
Tape Z-Exploded view 13
Primed circuit board view from component side 15
Schematic diagram (120V model) 17
Printed circuit board-parts list 19
Schematic diagram (G/W models) 2|
Block diagram of IC 22
Packing view 23

ON KYOQ
Alllllll BIIMPIINEHIS

Page 2

TA-WBB

SPECIFICATIONS

Track System : 4-track, 2-channel stereo

Recording System : AC bias

Erasing System : AC erase

Tape Speed : 4.8 cm/sec. High Speed 9.5 cm/sec,
Wow and Flutter : 0.06% (WRMS)

Frequency Response : 20- 15,000 Hz (30- 14,000Hza-J dB)

(normal position tape)

20716300 HZ (30-l5,000 H213 (18)
(high position tape)

20-17000 Hz (30*16,000 Hut-3 dB)
(metal position tape)

Signal-Io-Noise Ratio : Dolby NR out, 58 dB

(metal position tape)

A noise reduction of 10 dB above 5 kHz
and 5 dB at 1 kHz is possible with the
Dolby NR in

lnput Jacks : Microphone Jacks : 2

Minimum input level : 03 mV/GOOQ
lnput impedance : 5 kn
Optimum mic impedance :
2009 - 50kt}

Line In : 2
Minimum input level : 50 mV
Input impedance : 50 kfl

DIN Jack : I (Only G/W Models)
Minimum input level :01 mV/lkfl
lnput impedance : 2.7 kl)

CAUTIONS

l.

The continuous tape playback function is used to play back the
cassette tape in TAPE-l holder and then the cassette tape in
TAPE-2 immediately afterward lf TAPE-2 does not operate. con-
firm that the tape playback switch is in the SEP. position.

The TA-W88 has two cassette holders so that dubbing (copying)
operations can he performed without using another cassette deck.
To save time, the TA-WSS also has a high-speed dubbing capabili-
ty that records tapes in about half the time required by normal
speed recording. Tape dubbing can only be performed from the
TAPE-l cassette holder to the TAPE»2 cassette holder. Dubbing
the opposite direction is not possible.

Outputs : Line Out : 2
Output level : 350 mV (at 0 VU)
Optimum load impedance : over 50 Ml
DlN Jack (Only G/W models)
Standard output level : 500 mV (at 0
dB)
Optimum load impedance : over 50 kt?
Headphone Jack : l

89 -200fl
Motor : DC Servo motor : 2
Heads : Hard permalloy heads : 2
Ferrite head : l
Semiconductors : TR252 Diodes: 17 [CS LEDs:7 (G/W
models)
TR:50 Diodes:l7 [C15 LEDs:7 (D/Q
models)
Power Supply : AC 120V, 60Hz (D model)

AC 220V, SOHZ (Ct model)
AC 120/220V, 50/60Hz (W model)
AC 240V, 50Hz (Q model)

Power Consumption : 18W

Dimensions : 418(W) x 122(H) x 270(D)mm
16-1/2" x 4.7/8" x 105/8

Weight : 55 kg (12ll lbs.)

Accessories : Pin-type connecting cords

' Specifications and external appearance are subject to change
without notice because of product improvements

3. Voltage Selector (on back Panel)
W model is equipped with a voltage selector. If the unit you own
has a voltage selector, be sure it is set to the proper voltage before
the power is turned on. To change the selector to conform to the
power supply in your area, insert the tip of a screwdriver in the
groove of the switch and slide it all the way to the left or right.

220 V 120 V 220 V 120 V
at AC 120 V at AC 220 V

Note :
Units not equipped with a voltage selector can only be used in areas
where the power supply agrees with the voltage specified on the back
panel.

Page 9

3. Playback level adjustment
Normal speed
Insert the MIT-ISO test tape into the TAPE-l cassette holder. Play
the MTT-ISD back. Adjust the R123. (L ch.) and R124 (R ch.)
semi-fixed resistors so that the indication of voltmeter becomes
580mV.
Insert the MTT-ISO into the TAPE-2. Play the MIT-ISO back.
Adjust the R169 (L ch.) and R170 (R ch.) semi-fixed resistors so
that the indication of voltmeter becomes SSOmV.

High speed

Set the tape spwd switch to the HIGH position. Insert the
MTT-ISO into the TAPE-l cassette holder. Play the MTT-ISO
back. Adjust the R131 (L ch.) and R132 (R ch.) semi-fixed
resistors so that the indication of voltmeter becomes 580mV.

Voltmeter
47m H
7" L2
~ -_. the
\ L.;,J7°
TF105
TPIOS

4. VI} indication adjustment

Insert the MTT~ISO test tape into the TAPE-2 cassette holder. Play
the MTT-ISO back. Adjust the R269 (L ch.) and R270 (R ch.) semi-
fixed resistors so that the +3dB L.E.D. of VU indication lights
up. Next apply the lkHz signal to the line-in terminals. Press the
pause and recording buttons and put the TAPE-2 into the recorv
ding mode. Adjust the input level volume so that the OdB L.E.D.
of VU indication light up. Then set the attenuator for -ldB input
level. Adjust the R269 and R270 so that the OdB L.E.D. goes out.
Confirm that the +3dB LED light up when play the MTT-ISO
back.

AF OSC
Voltmeter

47 kn
C} 'N p [Z]
Attenuator r-
° L.

7333;: Unit J3 °

Output terminal

5. Playback frequency adjustment
Set the tape speed switch to the HIGH position. Insert the MTT-
215C test tape into the TAPE-l cassette holder. Adjust the R133
(L ch.) and R134 (R ch.) semifixed resistors so that the 315Hz and
lOkHz signals become same level,

Voltmeter

47kfl

_. 1
J a
W., F

LINE OUT

6. Recording hias adjustment
Insert the normal blank tape into the TAPE-2 cassette holder.
Press the recording and pause buttons together and put the
TAPE-2 into the recording mode.
Apply the 400Hz signal to line-in terminal. Adjust the input level
volume so that the OdB indicator light up.
Then set the attenuator for -20dB input level. Release the pause
button and record on the tape. Next change the frequency of the
lOkHz and record again.
Adjust the R217 (L ch.) and R218 (R ch.) so that the 400111 and
lOkHz playback levels become same.

AF OSC
Voltmeter
47 kn
Q) Attenuator LINE IN ,- m
000 Unit J 3 L4)

Output terminal

7. Recording level adjustment
Insert the normal blank tape into the TAPE-2 cassette holder. Ap-
ply the l,000Hz signal to line-in terminal. Put the TAPE-2 into the
recording mode. Adjust the input level volume so that the
voltmeter reads 350mV.
Record on the tape. Adjust the R217 (L oh.) and R218 (R ch.) so
that the playback level becomes 3SOmV $0.5dB.

J
O O O :1 UNIT 0

OUTPUT VTVM

AF OSC Attenuator LINE IN

Page 11

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