Onkyo A 8700 Service Manual

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ONKYO® SERVICE MANUAL

Integrated Stereo Amplifier
MODEL A-37oo

U D 120V AC, 601-12
U G 220V AC, 50Hz
U Q 240V AC, SOHZ
U W IZUVIZZOV AC, 50Hz/60Hz

SAFETY-RELATED COMPONENT WARNING

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 COMPONENTS WITH ONKYO PARTS
WHOSE PARTS NUMBERS APPEAR AS SHOWN IN THIS
MANUAL.

MAKE LEAKAGECURRENT 0R RESISTANCE MEA-
SUREMENTS TO DETERMINE THAT EXPOSED PARTS
ARE ACCEPTABLY INSULATED FROM THE SUPPLY
CIRCUIT BEFORE RETURNING THE APPLIANCE TO
THE CUSTOMER

A-8700

SERIAL No.3340

TABLE OF CONTENTS

Specifications
Precautions

Block diagram

IC block diagram

Front panel facilities
Adjustment procedures
Chassis exploded view
Printed circuit board parts list
Parts list ofpacking
System connections
Printed circuit board view

Schematic diagram

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A-8700

SPECIFICATIONS

Continuous Power Output:

Dynamic Power:
Total Harmonic Distortion

lnlermodulalion Dislortion:
Damping Factor:

Input Sensitivily/
Impedance:

Oulpui Level/Impedance:
Phono Overload:

Tone Control
(Vol - 20(18):

High cm:
Frequency Response:

HIAA Deviation:
Subsonic Filler
(MM SUBSONIC
MC SUBSONICI:
Signal to Noise
Ratio (MFA)-

Muting:
Power Supply:

2 x 160 walls at 4 ohms, 1 kHz (DIN)

2 X115walts at 8 ohms, 1 kHz (DIN)

105 watts per channel, min, HMS, at 8 ohms
both channels driven [ram 20 Hz to 20 kHz.
with no more than 0.008% Total harmonic
distortion.

303walls at 2 ohms,

235walis at 4 ohms

0 008% at rated power

0.003% at I wall output .
0.005% at rated power

50 al 8 ohms (1 kHz)

Phone (MM): 2.5 mV/50 kohms
Phone (MC): 160 uV/ISO ohms
CD: 150 mV/SO kohms
TUNER: 150 "iv/30 kohms
Tape Play: 150 mV/SO kohms
Tape Flee: 150 mV/1.0 kchms (Phone)
Phone (MM): 200 mV HMS. al 1 kHz.
0.0i2% THD.
BASS: 18 dB at 100 Hz
TREBLE: :8 dB at 10 kHz
6 kHz (6 dB/Octave) (TREBLE mini)
CD, Tuner: 2 Hz - 50 kHz
(+0, 71 dB)
Phono (MM): :0 3 dB, 20 Hz 7 20 kHz

20 Hz (43 dB, 6 dB/Ocl.)

Phono (MM): 94 dB (5 0 mV input)
Phnnn (MC): 75 as (0 5 mV input)
on (DIRECT): 107 dB

-20 dB

European modelszACZZOV. 50 Hz

USA 8- Canadian models: AC 120V, 60 Hz

U.K Bi Australia models: ACZ40V, 50 Hz

Worldwide modesl: A0120 and 220V
switchable, 50/60 Hz

435 x 157 x 391 mm

174/6 X 66/16" X 15-3/5"

13.5 kg, 29.8 Ibs

Dimensions (Wx H x D):

Weight:

Specifications and teatures are subject to change wilnoul noticei

PRECAUTIONS

1. Replacing the fuses
For continued protection against risk fire, replace only with same type and same rating fusc.

CIRCUIT No. PART NO. DESCRIPTION
F901 252052 7A ST-o, Primary fuse (120V. HOV/220V models)
F902 252077 or 4A«SE-EAK or
252077CC 4A-SE7EAK Primary tuse (220V. 240V. 120V/220V models)

2. Insulation resistance mesurement (Only U.S.A. model)
Connect the insulating-resistance tester between the plug of power supply cable and the terminal GND on the
back panel.
Specifications; More than 10 M!) at 500V.

3. Voltage selector (rear panel)
Worldwide models are equipped with a voltage selector to conform with local power supplies. Be sure to set this
switch to match the voltage of the power supply in your area before turning the power switch on. Voltage is
changed by sliding the groove in the switch with a 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. Models without a voltage selector
can only be used in areas where the power supply is the same as that of the unit.

DEI ED
220V~ 120VN 220V~ 120V~
at AC 120 V at AC 220 V

_2_.

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CHASSIS-EXPLODED VIEW