Onkyo T 9090 Service Manual

Page 1

SER

ONKYO SERVICE MANUAL

SYNTHESIZED
FM STEREO TUNER

MODEL T-9090

SAFETY-RELATED COMPONENT WARNING I!

COMPONENTS IDENTIFIED BY MARK A ON
THE SCHEMATIC DIAGRAM AND IN TIIE PARTS
LIST ARE CRITICAL FOR RISK OF FIRE AND
ELECTRIC SHOCK. REPLACE THESE COMPO-
NENTS WITII ONKYO PARTS WHOSE PAR'IS
NUMBERS APPEAR AS SHOWN IN TIIIS MANUAL.

MAKE LEAKAGECURRENT OR RESISTANCE
MEASUREMENTS TO DETERMINE THAT EX-
POSED PARTS ARE ACCEPTABLY INSULATED
FROM THE SUPPLY CIRCUIT BEFORE RETURN-
ING THE APPLIANCE TO THE CUSTOMER.

TABLE OF CONTENTS

Specifications ...........................
Service procedures ........................
Block diagram ...........................
Exploded View ...........................
Parts list ...............................
Block diagram of IC
Adjustment procedures .....................

Schematic diagram ........................
Printed circuit board parts list .................
Packing view ............................

ONKYO
AIIIIIII BflMPIIIIIIIIS

Tfl9090

IAL No. 3190

.3
.4

I7
19
23

Page 2

90

SPECIFICATIONS

(120V model)

Tuning Range:

Usable Sensitivity:

SOdB Quieting Sensitivity:
Capture Ratio:
Intermodulation:

Image Rejection Ratio:

IF Rejection Ratio:
Signal-to-Noisc Ratio:

Alternate Channel Att:

AM Suppression Ratio:

Total Harmonic Distortion:

Frequency Response:
Stereo Separation:

Output Voltage:
Gmoral

Power Supply:
Antennas:
Semiconductors:

Dimensions (W x H x D):

Weight :

87.9 7 107.9 MHZ (ZOOkI-lz
steps)

Mono: 12.8dBf, 1.2[1V (75 ohms)
Stereo: 17.2dBf, 2.0;1V

Mono: 15,8dBf, 1.7uV

Stereo: 37.2dBf, ZOuV

1.0dB

IIOdB

IOOdB

IOOdB

Mono: 95dB (IHF)

Stereo: 85dB (IHF)

SOdB IHF (i 400kHz, II: super
narrow)

60dB

Mono: 0.009% (IF : wide)
Stereo: 0.02% (IF : wide)

30 - 15,000Hz+0.5dB, 71.0dB
55dB at IkHz (IF : wide)
33dB at 70 7 10,000Hz (IF :
wide)

0 71.5V

ACIZOV, 60Hz

75 ohms unbalanced

FETs: 18 Transistors: 38
le: 22 Diodes: 86 LEDs: 41
450 x 99 x 388mm

(17 3/4" x 4" x 15 3/8")
6.6 kg., 14.5 lbs.

(other models)
Tuning Range:

Usable Sensitivity:

SOdB Quieting Sensitivity:

Capture Ratio:
Intermodulation:
Image Rejection Ratio:
IF Rejection Ratio:
Signal-to-Noise Ratio:

Selectivity:

AM Suppression Ratio:

Total Harmonic Distortion:

Frequency Response.
Stereo Separation:
Output Voltage:

Ganeral
Power Supply:

Antennas:
Semiconductors:

Dimensions (W x H x D):

Weight:

87.5 7 108.0 MHZ (SOkI-Iz
steps)

Mono: 0,8;1V (S/N 26dB, 40kHz
Dev.) DIN

Stereo: 20.0}1V (S/N 46dB,
40kllz Dev.) DIN

Mono: 15.8dBf, 1.7;1V
Stereo: 37.2dBf, ZOHV
1.0dB

IIOdB

IOOdR

IOOdB

Mono: 9SdB (IHF)

Stereo: 85dB (IHF)

SOdB (i 300kHz, IF : super
narrow)

60dB

Mono: 0.009% (IF : wide)
Stereo: 0.02% (IF : wide)

30 - 15,000HZ+0.5dB, 71.0dB
55dB at IkHz (IF : wide)
33dB at 70 7 10,000I-Iz (IF:
wide)

0-1.5V

AC220V, 50H:

AC120/220V, 50/60Hz

75 ohms unbalanced (DIN socket)
FETs: 18 Transistors: 38

ICs: 22 Diodes: 86 LEDs: 41

450 x 99 x 388mm

(17 3/4" x 4x 15 3/8)

6.6 kg.. 14.5 lbs.

0 Specifications and features are subject to change without notice.

SERVICE PROCEDURES

1. Replacing the lamp
This unit uses the lamp listed below.
Circuit no. Parts no. Desciption
IL921 210064A IL 6.3V, 250mA, Dial
plate illumination

2. Safety-check out (D model)

After correcting the original service problem, perform
the following safety check before releasing the set to

the customer:

Connect the insulating-resistance tester between the
plug of power supply cable and nickel screw on the

back panel.
Specification: 3.3M!) 110% at 500V

3. Change of De-emphasis

W models are equipped with a SOpsec-75psec selector
switch. This switch is located on the back panel. This
switch is set to 50Mscc at the factory, but may have to
be reset to 75nsec depending on the area where the unit

is used.
Europe: 50usec
U.S.A,: 75usec

. Change of voltage

W models are equipped with a voltage selector to con»
form with local power supplies. This switch is located on
the back panel. Be sure to set this switch to match the
voltage of the power supply in your area before turning
the power switch on,

This switch is set to 220V at the factory. Voltage is
changed by sliding the groove in the switch with the
screwdriver to the right or left. Confirm that the switch
has been moved all the way to the right or left before
turning the power switch on.

. Memory Preservation

This unit does not require memory preservation bat-
teries, A built-in memory power back-up system preser-
ves contents of the memory during power failures and
even when the unit is unplugged. The unit must be plug-
ged in and the power switch turned on and off once in
order to charge the back-up system. Note that since this
is not a permanent memory. the power switch must be
turned on and off a few times each month to keep the
back-up system operable, The period of time during
which memory contents are preserved after power has
last been turned off varies depending on climate and the
location and placement of the unit. On the average.
memory contents are protected over a period of 3 to 4
weeks (a minimum of 2 weeks) after the last time
power has been turned off, This period is shorter when
the unit is exposed to very high humidity or used in an
area with an extremely humid climate.

Page 13

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