Onkyo RDA-7, RDA-7 Service manual

RDA-7

1

SERVICE MANUAL

Seven Channel Amplier

RDA-7

Ref NO. 3651

TABLE OF CONTENTS

1 Cover page

2 Specications, Supplied accesories

3 Unpacking abd storing the packing materials

4 Front panel

5 Rear panel

7 Chassis-exploded view

8 Parts list

16 Screws

18 Adjustment procedures

19 Pcboard

20 Primary connections

22 Circuit diagrams

SAFETY-RELATED COMPONENT

WARNING!!

COMPONENTS IDENTIFIED BY MARK 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 PART NUMBER APPEAR AS SHOWN IN THIS
MANUAL.
MAKE LEAKAGE-CURRENT OR RESISTANCE MEA­SUREMENTS TO DETERMINE THAT EXPOSED PARTS
ARE ACCEPTABLY INSULATED FROM THE SUPPLY
CIRCUIT BEFORE RETURNING THE APPLIANCE TO

Silver model

UPP 230 V AC

UDT 120 V AC

UPT 230 V AC

May 2000

RDA-7

2

RDA-7

Supplied accessories

Check that the following accessories are supplied with the RDA-7.

Power cord × 1

The power cord may differ

depending on the region.

Power cord

Poly bag

Instruction Manual

Inner carton

Specifications

AMPLIFIER SECTION

Number of channels: 7
Power:

150 watts per channel min. RMS at 8 ohms, 2 channels
driven from 20 Hz to 20 kHz with no more than 0.1 % total
harmonic distortion.

300 watts per channel min. RMS at 4 ohms, 2 channels
driven at 1 kHz with no more than 0.1 % total harmonic

distortion.
Frequency response @ -3 dB: 3.5 Hz - 250 kHz
Input Impedance: 47 kohm each phase
Input signal for max output power:

1.2 V

Input Sensitivity (Unbalanced):

100 mVrms
Input Sensitivity (Balanced): 200 mV
THD: 0.03 %(20 Hz to 20 kHz)
Damping Factor: 40 at 8 ohm
Power consumption

USA, Canada and some Asian model:

15 A

Other models: 10 A

Rated Speaker Impedance: 4 ohms

GENERAL

Power Supply: AC 120 V, 60 Hz

AC 230 V, 50 Hz

AC 220 V, 50/60 Hz
Dimensions (W × H × D): 450 × 195 × 596 mm

17-11/16" × 7-11/16" × 23-7/16"
Weight: 51.0 kg, 112.4 lbs.

Specifications and features are subject to change without
notice.

Power supply and voltage vary depending on the area in
which the unit is purchased.

RDA-7

3

Unpacking and storing the packing
materials

Unpacking

When unpacking the RDA-7, be sure to remove all
accessories from the cardboard box and then check
that all are included and none are missing.

Removing the RDA-7

After removing the RDA-7, carefully inspect it to make
sure that it has not been damaged during the shipping
processes. If damaged, contact an Onkyo service
station or representative immediately. Also, take down
the name of the carrier in case it is necessary to obtain
compensation from the carrier service.

Storing the packing materials

After unpacking, store the cardboard box and packing
materials in a safe place; do not throw them away. If
you are to transport the RDA-7 at a later date, you will
need this cardboard box and the packing materials.
The RDA-7 is very heavy and may become damaged if
it is transported in a different box.

Inner carton

Outer carton
(Shipping carton)

Inner carton

Pad

Pad

Poly bag

RDA-7

4

On

Standby

On

Power

O f f

Seven Channel Amplifier

RDA-7

Front panel facilities

Power On / Off

Pressing this switch connects the RDA-7 to the main
Power outlet and the On indicator lights blue. Sound will
be heard after approximately 9 seconds. If you want to
operate the RDA-7 using a 12-volt trigger, connect to
the 12V TRIGGER terminal of a control amplifier or pre­amplifier and leave the Power switch of the RDA-7 set to
On.

For example, to control the RDA-7 while it is connected
to the RDC-7 AC controller, connect the 12V TRIGGER A
jack of the RDC-7 to the 12V TRIGGER IN jack of the RDA­7 with a 3.5-mm (1/8-inch) mini-jack cable.

If a plug is connected to the 12V TRIGGER IN jack:

The signal reaches the 12V TRIGGER, the On indicator
lights blue. When there is no signal at the 12V TRIGGER,
the Standby indicator lights red.

On/Standby

The RDA-7 is equipped with two indicators to display its
status. If both indicators are off, then the main Power
switch on the front panel is turned off. If the Power switch
is turned on, then one of these indicators will be lit.

On: Lights blue when Power is supplied from the AC
mains Power supply.

Standby: Lights red when no signal is input from the
12V TRIGGER IN terminal and the RDA-7 is in the
Standby state.

Note:

If the Power switch is pressed and neither indicator lights,
check that the Power cord is properly connected and
that a fuse has not blown. If the indictors still do not light,
turn off the RDA-7, disconnect the Power cord, and
contact an Onkyo service station or representative.

If the On indicator lights blue and the Standby indicator
flashes red, the protection circuitry of the RDA-7 has
activated. The protection circuitry activates if a
problem such as a speaker cord shorting or the
temperature of the RDA-7 rising excessively occurs. Turn
off the RDA-7, remove the cause of the problem, and
then turn the RDA-7 back on. If the problem is still not
solved, turn off the RDA-7, disconnect the power cord,
and contact an Onkyo service station or representative.

RDA-7

5

INPUT SELECT /

This switch is located between the balanced input and
single-ended RCA input for each channel. Use this
switch to select the input type for its channel.

Note:

• Do not change the INPUT SELECT switch setting when
the RDA-7 is turned on.

Rear panel facilities and connections

Unbalanced Input (single end RCA input)

Connect controllers or pre-amplifiers with single-ended
outputs for high-quality sound.

Note:

• When using this single-ended connection for a
specific channel between the pre-amplifier and
RDA-7, set the INPUT SELECT switch to the RCA input
side to select single-ended input. Next, use high­quality cables and connect the single-ended output
from the pre-amplifier to the corresponding single­ended input on the RDA-7.

• Do not connect anything to the balanced input jack.

Note:

• When using this balanced connection for a specific
channel between the pre-amplifier and RDA-7, set
the INPUT SELECT switch to the XLR input side to select
balanced input. Next, use high-quality cables and
connect the balanced output from the pre-amplifier
to the corresponding balanced input on the RDA-7.

• Do not connect anything to the RCA-type audio
input jack.

The pin assignments for this terminal are given above.
This pin assignment conforms to the standard adopted
by the Audio Engineering Society. Refer to the
instruction manual supplied with the pre-amplifier and
verify that its output terminal is compatible with the pin
assignments for this terminal. If it does not, wire it so that
the output pins connect with the proper input pins.

Connector ground terminal: Chassis grounded

2. Disconnecting the input terminal

Pull out the connection cord while holding down the lever.

Balanced Input (XLR terminal)

Connect controllers or pre-amplifiers with balanced
outputs for high-quality sound.

Precaution for connection

This unit comprises 7 independent power amplifiers,
each being capable of reproducing the same quality
sound through its channel. Note that you should
connect an input source and a speaker to each
channel in use. For channels that are not in use, we
recommend that you do not connect any input source
or speaker.

12

3

1. GND

2. non-inverting (+)

3. inverting (-)

Input terminal

1. Connecting the input terminal

Match the pins and insert the terminal until you hear a
“click.” Ensure that it is secure by gently pulling it.

SPEAKER IMPEDANCE

4 OHMS MIN. PER EACH
SPEAKER TERMINAL

AC INLET

SEVEN CHANNEL AMPLIFIER

MODEL NO. RDA-7

INPUT
SELECT

OUTPUT

FUSE

SURROUND BACK
RIGHT

SURROUND
RIGHT

12V TRIGGER

IN OUT

SURROUND
LEFT

CENTER LEFT

SURROUND BACK
LEFT

RIGHT

INPUT
SELECT

OUTPUT

INPUT
SELECT

OUTPUT

INPUT
SELECT

OUTPUT

INPUT
SELECT

OUTPUT

INPUT
SELECT

OUTPUT

INPUT
SELECT

OUTPUT

Caution

• Do not connect the Power cord until you have finished all other connections.

• Read the instructions that came with the other components you are connecting.

• Do not make connections to input or output jacks while the RDA-7 is turned on (Power

on).

• Always turn the volume of the pre-amplifier down before turning on the RDA-7.

Push

RDA-7

6

Rear panel facilities and connections

Fuse

The RDA-7 uses a 250V AC slow-blow (time lag) main
fuse. To replace the fuse, insert a coin or similar object
into the groove, turn it to the left, and remove the fuse.
Replace only with the same type and same rating. The
correct fuse rating will differ depending on the voltage
of your set as given here.

120V:T15A/250V
220V/230V/240V:T10A/250V

AC INLET

Plug the supplied Power cord into this AC INLET and then
into the Power outlet on the wall,

Caution

• Do not connect any devices other than speakers to
these terminals. Also, never short-circuit the output
from these terminals.

• Be sure not to mistake the positive and negative
outputs or the left and right speakers. Doing so will
result in an unnatural sound space.

• Only connect speakers with an impedance of 4
ohms or greater. If a speaker with an impedance of
less than 4 ohms is connected, it may damage the
RDA-7.

• Do not connect more than one speaker cable to
one output terminal. Doing may damage the RDA-7.

Be sure to read “Phasing your speaker system” and
“Speaker ratings” on the following page.

• Do not use a Power cord other than the one supplied
with the RDA-7. The Power cord supplied is designed
for use with the RDA-7 and should not be used with
any other device.

• Never have the Power cord disconnected from the
RDA-7 while the other end is plugged into the wall
outlet. Doing so may cause an electric shock. Always
connect by plugging into the wall outlet last and
disconnect by unplugging from the wall outlet first.

Ground

If connecting the unit to another equipment causes
noise such as a hum, you may improve the reproduced
sound quality by connecting this terminal to the
grounding terminal of the connected equipment with a
lead wire.

5-12 volts,
positive tip
polarity

1

34 5

2

15 mm

(5/8 inch)

Warning

Before replacing the fuse or making any electrical
connections, always turn off the Power and disconnect
the Power cord.

12V TRIGGER IN/OUT

Connect the 12V TRIGGER IN jack to control amplifiers
that have a 12V TRIGGER output jack, such as the RDC-

7. This jacks works on between 5 to 12 volts DC. With the
Power switch of the RDA-7 set to On, you can switch the
RDA-7 between the on and Standby states with
operations at the control amplifier.

If you want another component to be activated by
turning on and off the control amplifier connected to
the 12V TRIGGER IN jack of the RDA-7, then connect the
12V TRIGGER input jack of that component to the 12V
TRIGGER OUT jack of the RDA-7. In this state, even if the
RDA-7 is turned off, the signal from the control amplifier
passes through the RDA-7 and goes out the 12V
TRIGGER OUT jack. Daisy chaining is also possible using
these jacks.

Use φ3.5-mm (1/8-inch) monaural-type mini-jack
connectors. The tip polarity of the connectors are as
shown below.

1.

Strip away 15 mm (5/8 inch) of wire insulation.

2. Twist wire ends very tight.

3. Unscrew

4. Insert wire

5. Screw

+ OUTPUT –
(Speaker output and binding post)

The RDA-7 is equipped with high-current binding posts
for use at output terminals to the speaker system. To
obtain the best in sound quality from the RDA-7, we
recommend the use of high-quality speaker cables.

For each channel, connect the negative (or black)
output post to the negative (or black) input terminal of
the speaker and the positive (or red) output post to the
positive (or red) input terminal of the speaker.

Make the connections following the procedure given
below.

• Make sure that connections have been made only
to the inputs selected with the INPUT SELECT switches
and nothing is connected to the other ones.

Power cord (supplied)

To an AC wall outlet

AC INLET

RDA-7

7

CHASSIS-EXPLODED VIEW

Top Cover

Amp Module

Front Panel Assembly

Chassis

RDA-7

8

RDA-7 Amp Module

REF. NO. PART NO. DESCRIPTION

Heatsink

11 - M3X6, Pan Hd Phil, BLACK oxide, Screw(PCBH)

11-1 - Standoff 4.5M3X8, BR517109.0-00

PCB Bracket

5 - 6-32x3/8, Pan Hd Phil SEMS, Blk, Screw(PCBB)

SP terminal

- Nut, Washer included (21-0062)

- Cover 21-0062, CL159706YA

- Wire (Red), 14AWG

- Wire (Black), 14AWG

PCB(RDA-7-010-C)

- TERM: Lug solder #6, Mfg #21 ERICK (JMP 14-2014)

Resistors

R1, R85, R77, R84 - 30.1K

R2 - replace to VR8

R3, R17, R49 - 2.00K

R4 - 110K

R5, R81, R83 - 10.0K

R67, R75, R76, R78,R80,R82,R6 - 100K

R7, R8 - 13.0K

R9, R10 - 6.49k

R11, R12 - 16k/2W

R13, R15 - 47k

R14,R16,R41,R42,R26,R27,R47 - 100 Ohm

R18, R31, R38, R64 - 5.62k

R19, R20, R21, R22 - 43.2k

R23 - 147k

R24 - Trimpot Single Turn 50k

50k Bourns 3386C

R25, R28 - 215 Ohm

R29, R33 - 2.15k

R30, R32, R37, R39, R51, R52 - 47 Ohm

R34, R35 - 619 Ohm

R36, R40 - 68.1 Ohm

R43, R44 - 10k, 1/2W

R45 - 562 Ohm

R46 - Trimpot 25 Turn 500 Ohm

Bourns 3296X

R48 - 158k

R50 - 1k

R53, R54 - 12k

R55 - 215 Ohm

R57 - R62 (47-0089) - 0.22 Ohm, 3W, Wirewound (8-21-00)

Pecker, Non-Inductive

R63 - 10 Ohm, 3W, Wirewound

Non-Inductive

Parts List

RDA-7

9

REF. NO. PART NO. DESCRIPTION

R65 - 4.02k

R66 - 1k

R68 - 562 Ohm

R69, R72, R73 - 215k

R70 - 261k

R71 - 562k

R74 - 348k

R86 - 7.5k

R87, R88 - 10 Ohm

R90, R91 - 1k

R92 - Do Not Load

R93 - Zero Ohm Jumper

Tube

R95, R96 - Do Not Load

Capacitors

C1, C2 - 0.01uF ATI 15-0054, AC Ceramic

C3 - C6 (15-0051) - 10,000uF/ 80V LP5 -80V103MS57, Elna

C7, C9, C40 - 100uF/100V, Alum. axl

BC 2222 021 90532

C8, C10 - 0.47uF/100V E1474, Polyester

C11, C12 - 1uF/50V Tant., P2073-ND or Equiv.

C13, C14 - 3.3uF/100V EF1335-ND 15-0034, Polyester

C15 - 220uF/50V Radial 10x16mm, EL

P6269-ND

C17, C20 - 10uF/100V EF1106-ND, Polyester

C18, C19 - 1000pF/50V P3102-ND or Equiv., Film

C21 - 3.3uF/100V EF1335-ND 15-0034, Polyester

C22, C23 - 6.8pF/50V Axial, Cer.

C24, C25 - 22p/ 100V Axial, Cer.

C26 - 0.1uF/50V P4593-ND, Film

C27 - 0.01uF/50V RA, 103, Cer.

C28 - 1000pF/50V Axial, Cer.

C29 - 4.7uF/25V, Tant

C30, C31, C35, C39, C45 - .01uF/50V, Axial, Cer.

C32, C33, C34 - .1uF/50V Axial, Cer.

C36 - 47uF/25V, 5mm, radial, P6238-ND, EL

C37 - 10pF 50V Axial , Cer.

C41 - 0 33uF 10V Radial P6212-ND, Alum.

C42 - 2.2uF 100V Radial P6290-ND, Alum.

C38 - 100pF/50V, Poly,

Inductors

L1 - Load 16 Gage Bare Wire Jumper

Nylon Tube

Fuses

F3, F4 - Littelfuse Pico II R251 015, F837-ND

Semiconductors

CR1, CR2 - Rectier Bridge 10A

12 - 5-40x1/2, Socket Hd Cap, Blk (25-0052), Screw(TRM)

12-1 - Washer, Square Cone #6x.312, 25-0048