Onkyo TA 2600 Service Manual

Page 1

ONKYO SERVICE MANUAL

STEREO CASSETTE
TAPE DECK
MODEL TA-2600

m A mm

TA-ZGOO

SERIAL NO. 3300

I UD,UD®
i UG

120V AC . OIIHZ

fibv AC. sari;

lUW

IN 01 220V AC. 50/(10Hz

I UQA. UQB

240V AC. 50H]

SAFETY-RELATED COMPONENT WARNING! I

COMPONENTS IDENTIFIED BY MARK A ON
THE SCHEMATIC DIAGRAM AND IN THE PARTS
LIST ARE CRITICAL FOR RISK OF FIRE AND
ELECTRIC SHOCK. REPLACE THESE COM-
PONENTS WITH ONKYO PARTS WHOSE PARTS
NUMBERS APPEAR AS SHOWN IN THIS MANUAL.

MAKE LEAKAGE-CURRENT OR RESISTANCE
MEASUREMENTS TO DETERMINE THAT
EXPOSED PARTS ARE ACCEPIABLY 1N7
SULATED FROM THE SUPPLY CIRCUIT BEFORE
RETURNING THE APPLIANCE TO THE
CUSTOMER

ONKYO.
IIIIIIIII IIIIMPIIIIIIIIS

SPECIFICATIONS

Track Format:
Erasing System:
Tape Speed:
Wow and Flutter:

Frequency Response:

S/N Ratio:

lnput Jacks:

Outputs:

Motors:

Heads:

Power Supply Ratlng:

Power Consumption:
Dimensions:

Weight:

4-lracks. 2-channels
AC erase
4.8 cm/sec. (1-7/8 i.p.s.)
0.045% (WRMS)
20-17,000Hz (Normal)
(30- 16.000H1 I SUB)
20 ~18.000Hz (High)
(30 -17,000Hz : adB)
20-19,000Hz (Metal)
(30 ~18,000H2 t 3d B)
GOdB (metal tape. Dolby NR oil)
A noise reduction of 10dB above SkHz
and 5:18 at 1kHz is possible with Dolby 8
NR. A noise reduction oi 20dB at 5kHz is
possible with Dolby C NR.
Line IN: 2
Input sensitivity: 60mV
Input impedance: sokohms
Line OUT: 2
Standard output level: 500mV (odB)
Optimum load impedance: over
50 kohms
Headphonejack: 1
Optimum load impedance: 8 to 200
ohms
DC servo motor: 1
DC motor: 2
REC/PB: Special Hard Permalloy x 1:
Erase head: Ferrite x 1
UK. and Australian models:
AC 240V. 50Hz
U.S.A. and Canadian models:
AC 120V. 60Hz
Worldwide models:
AC 120V and 220V switchable, 50 / 60Hz
19 watts
435(W) x 132(H) x 366(D)mm
(17-1/8 x 5-3/15" x 1445/8")
5.8 kg. (128 lbs.)

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

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REC/PB 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 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-reststance tester between the plug of
power supply cord and chassis.

Specification51500V more than lOMQ

HX PRO CIRCUIT OPERATION
EXPLANATION

l. 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
1(lKHz and above) drops, and if the bias is decreased, the
response rises.

Drop Bias decrease?

\ s

b 32
Frequency >

' m
Bias Increase in.

REC!

2. Regarding the basic operation of HX PRO (Refer to Fig. l)
The fix 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 1) preserves the frequency response with
the integrated circuit of (b).

R450 + R448 (21)

2:: X C426 X R450 X R448 '

By means of the frequency of Fig. I. the frequency which
is effective from the beginning is determined. In the
ordinary situation. this is half the audio band (IOKHZ).
(lthHz ~ 7.5KHz).

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

Frequency =

Rise

/~\l

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 1
above, the frequency high region is raised. With this
control, the audio signal is instantaneously dealt with.

3. Regarding the operating conditions of the HX 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 SOOmV line out)
The audio signal component level is dependent upon the
waveform after point (e).