Onkyo TAR 200 Service Manual

Page 1

TA-RZOO

ONKYO SERVICE MANUAL

STEREO CASSETTE
TAPE DECK
MODEL TA-R200

UD,UD(N) 120V AC. 6(IHZ
UW 120/220V AC. 50/60?
UQ 240V AC. SOHZ

SAFETY-RELATED COMPONENT WARNING

COMPONENTS INDENTIFIED BY MARK A ON Wow and Flutter: 0.07% (WRMS)
THE SCHEMATIC DIAGRAM AND IN THE Frequency Responsc121LISJItl0Hz (Normal)
PARTS LIST ARE CRITICAL FOR RISK OF FIRE (3IH4MJUHZ i3dB)
AND ELECTRIC SHOCK. REPLACE THESE ZIHGWOHZ (i8)
COMPONENTS WITH ONKYO PARTS WHOSE S3H5:HZ 13
PARTS NUMBERS APPEAR AS SHOWN IN THIS HHM'HZ Wm

(SIHMIIIIH; :3dBI
MANUAL S/N Ratio: 58dB (metal tape. Dolby NR Off)
MAKE LEAKAGE-CURRENT OR RESISTANCE A noise reduction of India above SkHz
MEASUREMENTS TO DETERMINE THAT and SdB at lkIIz is possible with Dolby I3
EXPOSED PARTS ARE ACCEPTABLY NR. A noise reduction of 20dB at SkHZ is
INSULATED FROM THE SUPPLY CIRCUIT possible With Dolby C NR,
BEFORE RETURNING THE APPLIANCE TO 1"?I 13d: Lit": IN: 2
THE CUSTOMER Input Sensitivity: (IOmV

Input impedance: 50 k0th
Outputs: Line OUT: 2

Standard Output Icvcl: SIMlmV (OdB)
Optimum load impedance: over
50 1(0th
Headphone Jack: 1
Optimum loud impedance: 8 m 200

SPECIFICATIONS uhms

Motors: DC servo motor: 1

H _: , : X 1
Track Format: 4 Erasmg System: AC erase _ Power Supply Rating:LI.K. and AustrztlIan models:
Tape Speed: 4.8 cm/sec, (177/8 I.p.s.) AC 24(IV in;

USA. and Canadian models:
AC 120V. (IUHZ.
Worldwtdc models:

F AC 120V and 220V switchablei 50/sz
I Power Consumption: 11 watts
® Dimensions? 435(W)><122(HI><264(D)mm

(I77I/8><4713/I(I"X103/8)

Aun'fl chPflflfuIs weight: 3'9 kg W lbs.)
Specifications and external appearance are subject to change

without noting because of pmduct improvements.

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TA-R200

REC/P8 level -.>

SERVICE PROCEDURES

1, Replacement of power supply cord

There are two power supply cord outlets on the strainrelief.
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
I

Horizontal

tengrh Wise _
dlrection

direction

2. Insulating resistance measurement

Connect the insulating-resistance tester between the plug of
power stipply cord and chassis.

Specifications: 500V more than IOMQ

HX PRO CIRCUIT OPERATION
EXPLANATION

1. Regarding recording frequency characteristic and bias
Ordinarily. ifthc recording bias current is increased. REC/PB
frequency response level in the high frequency region (about
10KH2 and above) drops, and if the bias is decreased, the
response rises.

Rise

Drop Bias decrease? T
E
>
\ <- 2 _/\
Bias increase a?
5
Frequency -> E Frequency ->

2. Regarding the basic operation ofHX PRO (Refer to Fig. I]

The HX PRO uses the u PCl297CA 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.

The signal of l) preserves the frequency response with
thc integrated circuit of (h).

i R435 + R4373i77 (a I)
2n x C435 >< R435 x R433 _.

By means of the frequency of Fig. l. the frequency which

is effective from the beginning is determined. In the

ordinary situation, this is half the audio band [IOKHZ].
(lthHz ~ 7.5KHz),

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

2)

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 I) ~ 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 fix PRO

I) 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 500mV line out)
The audio signal component level is dependent upon the
waveform after point (C)