Onkyo TAW 200 Service Manual

Page 1

TA-W200

SERIAL NO. 3357

ONKYO SERVICE MANUAL

STEREO CASSETTE
TAPE DECK
MODEL TA-W200

Ui)N. UDC. UD

IZIIV AC. 6(le

[JG 220V AC. SOHZ
UW 120/22th ACSD/(vlle
UQA 240V AC, SOHZ
SAFETY-RELATED COMPONENT WARNING
COMPONENTS INDENTIFIED BY MARK AON S/N Ratio:
THE SCHEMATIC DIAGRAM AND IN THE
PARTS LIST ARE CRITICAL FOR RISK OF FIRE
AND ELECTRIC SHOCK. REPLACE THESE
COMPONENTS WITH ONKYO PARTS WHOSE Input Jacks:
PARTS NUMBERS APPEAR AS SHOWN IN THIS
MANUAL
MAKE LEAKAGE-CURRENT OR RESISTANCE outputs:
MEASUREMENTS TO DETERMINE THAT
EXPOSED PARTS ARE ACCEPTABLY
INSULATED FROM THE SUPPLY CIRCUIT
BEFORE RETURNING THE APPLIANCE TO
THE CUSTOMER.
Motors:
SPECIFICATIONS Heads:

Track System:
Erasing System:
Tape Speed:

4»tracks, 2-channels
AC erase
4.8 cm/sec. (1-7/8 i.p.s.)

9.6 cm/sec. (36/4 i.p.s.) (high speed dub<

Ding)

Wow and Flutter: 0.07% (WRMS)

Frequency Response: 20-15,000Hz (Normal)
(SO-14,000H223dB)
20-16,000Hz (High)
(SO-15,000Hz :3dB)
20-17,UOOHZ (Metal)
(30-16.000Hz: 3dB)

ON KYO.
MIIIIII liliMPlIIIIIIIS

Power Supply Rating:

Power Consumption:
Dimensions:

Weight:

Dolby NR off: 58dB (metal position tape)
A noise reduction of 10dB above 5kHz
and SdB at 1kHz is possible with Dolby B
NR. A noise reduction oi 20dB at 5kHz is
possible with Dolby C NR.
Line (N: 2
input sensitivity: BOmV
Input impedance: 50 kohms
Line OUT: 2
Standard output level: SOOmV (OdB)
Optimum load impedance: over 50
kohms
Headphone jack: 1
Optimum load impedance: 8 to 200
ohms
DC servo motor x2; DC motor x2
REC/PE: special hard permalloy x2:
Erase head: ferrite ><1
UK. and Australian models:
AC 240V, SOHZ
U.S.A. and Canadian models:
AC 120V, 60Hz
Worldwide models:
AC 120V and 220V switchable, 50/60Hz
32 watts
435(W)><122(H)X255(D)mm
(171/8X4-13/16><10-3/16")
4 8kg (10.6 lbs)

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

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REC/PB level -->

TA-W200

SERVICE PROCEDURES

1. Replacement of power supply cord

There are two power supply cord outlets on the straintelief.
Insert them in prescribed direction to ensure safety. AS-UC-
3 (UD<120V> model) should be inserted lengthwise and
other types of cords should be inserted horizontally.

Power Supply Cord Power Supply Cord

Horizontal

length WISE
direction

direction

2. Insulating resistance measurement

Connect the insulating'resistance tester between the plug of
power supply cord and chassis.

Specifications: 500V more than IOMQ

HX PRO CIRCUIT OPERATION
EXPLANATION

I. Regarding recording frequency characteristic and bias
Ordinarily, if the recording bias current is increased. REC/PB
frequency response level in the high frequency region (about
[(lKHz and above) drops. and if the bias is decreased. the
response rises.

RISE
Drop Bias decrease 1

l a I
>
\ (- 2
Bias increase E

Frequency ->

REC/

Frequency -

2. Regarding the basic operation ofHX PRO (Refer to Fig. l)
The HX PRO uses the p. PC1297CA IC The operation is
in accordance with the following.

I) At (a). the recording bias is added onto the audio signal.
and the recording signal is detected. This is the same as
the recording head recording the signal on the tape.

2) The signal of l) prcserves the frequency response with
the integrated circuit of (h)

R450 + R448

Zn X C426 X R450 X R448 (1

By means of thc frequcncy of Fig. l. the frequency which
is effective from the beginning is determined. In the
ordinary situation. this is half the audio band (lUKHz).
(IOKHz ~ 7.5KHz).

3) At (c), in order to use the affected waveform after-ward.
absolute detection is carried out.

Frequency =

4) At (d). the waveform peak value is detected. The output
becomes the peak DC voltage.

5) At (e). the standard voltage and the voltage of (4) are
compared,

6) With the output of (e). the frequency generation level is
controlled (voltage controlled amplifier). That is, the bias
size is varied.

7) Summing up 1) ~ 6):

At (a), the time constant (frequency) that is detected in
the recording signal is preserved, and above a certain
frequency and above a certain level, the VCA controls
the bias current by causeing its reduction. When this is
done. in the maner shown in the explanation of Item I
above, the frequency high region is raised. With this
control. the audio signal is instantaneously dealt with.

3. Regarding the operating conditions of the X PRO

1) With equation (2. I) noted above. the effect begins at the
frequency thus determined.

2) Above a certain level the effect begins.
(Substantially 0 dB: In the vicinity of SOOrnV line out)
The audio signal component level is dependent upon the
waveform after point (c).