Onkyo EQ 540 Service Manual

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SERIAL No 3303

ONKYO SERVICE MANUAL

Stereo Graphic Equalizer
MODEL EQ-540

mm m mum

UD

120V AC, 60Hz

UW

120V/220V AC, 50Hz/60Hz

UQ

240V AC, 50Hz

SAFETY-RELATED COMPONENT WARNINGI';

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 LEAKAGE-CURRENT OR RESISTANCE MEA-
SUREMENTS TO DETERMINE THAT EXPOSED
PARTS ARE ACCEPTABLY INSULATED FROM THE
SUPPLY CIRCUIT BEFORE RETURNING THE
APPLIANCE TO THE CUSTOMER.

TABLE OF CONTENTS

Specifications ...................................... 2
Precautions .............................. 2
Adjustment procedures 3
Front panel facilities ................................ 4
IC Block diagram 5
Packing procedures .................................. 8

System connections .................................. 10

Printed board parts list 11
Chassis exploded View """"""""""""" 14
Printed circuit board View 17
Block diagram ------------------------- 23

Schematic diagram .................................. 25

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SPECIFICATIONS

EQUALIZEFI SECTION
Input:

Output :

Max. output:
Frequency response:

Total harmonic distortion:

Signal to noise ratio:
Adjustable range;
Gain:

OSCILLATOR SECTION
Step frequencies:

Frequency response:
Output voltage:

MIC. AMP. SECTION
Input:

Frequency response:
Ma x1 input :

OTHERS

AC outlet:
Power supply:
Dimensions:

Weight :

Sensitivity (FLAT): 150 mV

Impedance: 50 kohms
Voltage (FLAT): 150 mV
Impedance: 1 kohm

More than 5 V, 20 Hz - 20kHz, 0,05% TI-ID.

+0/70.5 dB, 101-12 7 35 kHz

Less than 0.01%, 20 Hz - 20 kHz, 15 V output (FLAT)
100 dB, 1 5 V output, [HF-A, input short

:6 dB / i 12 dB

0 dB to 720 dB

32 Hz, 64 Hz, 125 Hz, 250 Hz, 500 Hz, 1 kHz, 2 kHz, 4 kHz,

8 kHz, 16 kHz

*1 dB, 32 Hz _ 16 kHz

150 mV

Sensitivity: 0.2 mV
Impedance: 50 kohms
+0l-l dB, 20H: - 30kI-Iz

100 mV

200 watts (UNSWITCHED)

AC 120V, SOHZ

435 (W) X 131 (H) x 362 (D) mm
17-1/8 x 5-3/16" x 14-1/4
5.7kg, 12.611351

Specifications and features are subject to change without notice.

PRECAUTIONS

1. Replacing the lamps
This unit uses the lamps listed below.

CIRCUIT N0. PART NO.
PL] 01 210195

DESCRIPTION
PLASEQSIIO

2. Insulation resistance measurement
Connect the insulating-resistance tester between the plug of power supply cable and the screw on the bottom board.
Specifications; 500V, more than 10 M0

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.

EEC] C1D

A _ A

220V~ 120V~ 220V~ 120V~
at AC 120V at AC 220V

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