Onkyo P 306 RS Owners Manual

Page 1

Artist/y in Sound ONKYO

P-306RS

Super Servo Stereo Preamplifier

***WARN|NG*** Instruction Manual
TO PREVENT FIRE OR SHOCK HAZARD.

DO NOT EXPOSE THIS UNIT TO RAIN

OR MOISTURE.

The serial number is Written on the rear panel of this

unit Copy the serial number and model number onto your
warranty card and keep it in a safe place. @

Page 2

For Safety

Please read the following safety instructions before using
this unit.

10.

. Read Instructions 7 All the safety and operating

instructions should be read before the unit is operated.

Retain Instructions 7 The safety and operating
instructions should be retained for future reference.

, Heed Warnings - All warnings on the unit and in the

operating instructions should be observed.

. Follow Instructions 7 All operating and use instruo

tions should be followed.

Water and Moisture 7 The unit should not be used near
water, for example, near a washbowl, fishbowl or in a
damp basement.

. Carts and Stands 7 The unit should be used only with

a cart or stand that is recommended by the
manufacturer,

. Wall or Ceiling Mounting 7 The unit should be

mounted to a wall or ceiling only as recommended by
the manufacturer.

Ventilation 7 The unit should be situated so that its
location or position does not interfere with proper
ventilation. For example, it should not be placed on a
bed, sofa, rug or similar surface that may block the
ventilation openings or placed in a builtAin installation,
such as a bookcase or cabinet, that may impede the
flow of air through the ventilation openings.

Heat - The unit should be situated away from heat
sources such as radiators, heat outlets or other
appliances that produce heat.

Power Sources - The unit should be connected to a
power supply only of the type described in the
operating instructions or as marked on the rear panel.

11.

12,

13.

14.

15.

16.

17.

Grounding or Polarization 7 Be sure the unit is
properly grounded and that polarization is correct.

Power Cord Protection - Power supply cords should
be routed so that they are not likely to be walked on
or pinched by items placed upon or against them,
paying particular attention to cords at plugs,
convenience receptacles and the point where they exit
from the unit.

Cleaning - To keep the unit looking like new, wipe
the cabinet every now and then with a silicon cloth or
other suitable soft material. To remove heavier stains
and smears, clip a soft cloth in a weak solution of
neutral cleanser, wring out well and then wipe clean,
Wipe dry with a separate dry soft cloth. Do not use a
rough cloth or solvents since these tend to mar the
appearance and even remove panel lettering.

Periods of Nonuse - The power cord of the unit
should be unplugged from the outlet when the unit is
left unused for a long period of time.

Spillage - Care should be taken so that objects do
not fall and liquids are not spilled into the enclosure
through the openings.

Damage Requiring Service 7 The unit should be

serviced by qualified service personnel when:

A. The power supply cord or plug has been damaged;
or

B. Objects have fallen or liquid has been spilled into
the unit; or

C, The unit has been exposed to rain; or

D. The unit does not appear to operate normally
or exhibits a marked change in performance; or

E. The unit has been dropped, or the enclosure
damaged.

Servicing - The user should not attempt to service
the unit beyond that described in the operating
instructions, All other servicing should be referred
to qualified service personnel.

Note:
0 AC Fuse

The fuse is located inside the chassis and is not user
serviceable. If power does not come on, contact your
Onkyo dealer.

Voltage Selector (Rear Panel)

The P-306RS is 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 or similar instrument to the up or
down positon. Confirm that the switch has been moved
all the way to the right or left before turning the power
switch on.

220V 220V
120V 120V
at AC220V at AC120V

Useful to Know

Since the P-306RS is a high gain amplifier and is thus
susceptible to induction noise, keep it away from TV
sets and other audio components equipped with large
power transformers.

Hum and other induction noise may be produced if
cables are too close to the power cord and power
transformer.

Page 4

Front Panel Facilities

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Connection Lamp

This lights when the Super Servo cable is connected to
the power amplifier. This lamp will not light up if
you use a cable other than the supplied Super Servo
cable or if the Super Servo cable is incorrectly
connected.

Power Lamp ..
The power lamp lights when the power switch L1] is
depressed, indicating that the power is on,

Super Servo Integral Lamp

This lamp lights when the power is on and the Super
Servo integral circuit is operating normally. However,
this lamp does not light until a few seconds after the
power has been switched on. Even if the power lamp is
on, no sound will be heard unless this lamp is on, too.

El

Power Switch
Press this switch to turn on the power. Press again to
turn power off.

Mode Selector

REV: Left and right channel signals are reversed.

NORM: Use this position for normal stereo

reproduction.

The left and right channel signals are mixed

so that you hear a combined (mono) sound

from both the left and right speakers. This

mode is used for monaural reproduction and

for checking left and right balance.

L: Only the left channel signal is sent to both
speakers.

R: Only the right channel signal is sent to both
speakers.

R+L:

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Recording Source Indicator Lamps
These light in accordance with the position of the
recording source selector [7].

Recording Source Selector

2 > 1 , Use for tape dubbing. For details, refer to

1 V 2 ' the section on tape dubbing.

OFF: Leave in this position when not using the
system for recording or tape dubbing

PHONO: For recording from phonograph records

CD: For recording from the CD player

TUNER: For recording from the tuner or the

component connected to the AUX terminals.
Use the TUNER/AUX selector Will to switch
between the tuner and AUX component.

Input Selector Indicator Lamps
These light in accordance with the position of the
input selector [El .

Input Selector

TAPE 1: For playback from the tape deck connected

TAPE 2: to the rear panel TAPE-1 or TAPE-2
terminals.

PHONO: For listening to phonograph records. Note
that it is also necessary to set the cartridge
selector El and phono selector El to the
proper positions.

CD: For listening to the CD player.

TUNER: For listening to the tuner or the component

connected to the AUX terminals. Use the
TUNER/ AUX selector US] to switch
between the tuner and AUX component.

Cartridge Selector

Switch this selector to match the type of phono
cartridge being employed. Because of the sudden
increase in volume level that can occur when changing
the position of this selector, always turn the volume
control hlil down before switching to a different

setting.

MM: When using an MM type cartridge, switch to
either of the MM positions depending on the
cartridge impedance. If the impedance is not
specified, switch to the 47 kohms position.

MC: When using an MC type cartridge, switch to

either of the MC positions depending on the

Page 7

Results Obtained Using the Super Servo Cables

In general, the preamplifier and power amplifiers are
connected to each other by pin-type cables. But, as can be
seen from figure 1 below, even though the left and right
channels may be carried in independent cables, the
grounding for both cables is common. Therefore, due to
cable impedance and pin terminal contact resistance, the
right channel signal will tend to flow back through the
left channel cable ground lead, and the left channel signal
flow back through the right channel cable ground lead.
On the other hand, when the accessory Onkyo Super Servo
cables are used, the super servo circuit shown in figure 2
completely eliminates the left/right mutual interference
present in normal pin-type cables. Deterioration in the
quality of sound when pin-type cables are used is thus
non-existent.

Preamplifier _
, Left channel signal path

Left channel

l

Right channell »

Right channel signal path

Fig. 1 Normal Pin-Type Cable Connections

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Dual Super Servo . l

Fig. 2 Dual Super Servo Amplifier Connection Super Servo Cable

Common Modes of Operation

Power amplifier

>-\7

First check that the following controls are set to the

following positions before turning the power switch [5] on.

Set the mode selector |5l to NORM, the recording source
selector m to OFF, the subsonic filter switch llZl to OFF
and the bass l174| , treble [El and balance W controls to

. l
1 Power Amplifier ;

the center positions, Turn the volume control llil down to
minimum and switch the muting switch [I7] to OFF.
When the power switch W is depressed, the power
indicator lamp [2] will light. However, a muting circuit
operates so that no sound is heard until the Super Servo
integral lamp [3] lights a few seconds later. Operation can
begin only after the Super Servo Integral lamp [3| lights.
Connection lamp E] lights to indicate that the Super

Servo cable is connected to the power amplifier.

Turntable Operation

Set the input selector M to the PHONO position and the
cartridge selector [Till and phone selector in to the
positions corresponding to the cartridge and turntable
being used. Start to play a record on the turntable and
then turn up the volume control Ml to a suitable level,
adjusting the tone controls if necessary.

Compact Disc Player Operation

Set the input selector Lil to the CD position and operate
the CD player. Adjust the volume and tone controls as
desired.

Tuner Operation

Set the input selector lil to the TUNER position, the
TUNER/AUX selector ill to the TUNER position and
tune to the desired radio station. Adjust the volume and
tone controls as desired.

Tape Deck Operation

The P-306RS can be connected to two separate tape decks.
Set the input selector E to the TAPE-1 position for
playback from the deck connected to the rear panel
TAPE-1 terminals and to the TAPE-2 position for playback
from the deck connected to the TAPE-2 terminals,

Recording Operations

Set the recording source selector [7| to the program source
to be recorded (for example, to record a phonograph
record switch to the PHONO position). Then start the tape
deck in the recording mode after setting the recording
level to the appropriate level using the input level con-

trol on the tape deck.

When recording with a 3-head tape deck, the just-recorded
program can be monitored by switching the input selector
|§l to the corresponding tape deck position (TAPE-1 or
TAPE-2),

Note: Do not change the mode selector [5] and balance
control 116:] settings while recording.

Tape Dubbing

When two separate tape decks are available, programs

previously recorded onto a tape can be copied directly

onto another tape, a process which is called dubbing.

Perform the following procedure to copy a tape from tape

deck 1 (connected to the rear panel TAPE 1 terminals) to

tape deck 2 (connected to the rear panel TAPE 2 termi-
nalsl.

1. Set the recording source selector to the 1 > 2 posi-
tion.

2. Start deck 1 in the playback mode and deck 2 in the
recording mode.

3. If deck 2 is a 3-head deck, the program can be
monitored either before or after it is recorded. The
signal from deck 1 prior to being recorded is monitor-
ed by setting the input selector lg] to the TAPE 1
position. The just-recorded signal from deck 2 is
monitored by setting the input selector [9] to the
TAPE 2 position.

Tape dubbing from 2 to 1

1. Set the recording source selector to the 2 > 1 position.

2. Start deck 2 in the playback mode and deck 1 in the
recording mode.

3. If deck 1 is a 3rhead deck, the program can be
monitored either before or after it is recorded. The
signal from deck 2 prior to being recorded is monitored
by setting the input selector [9] t0 the TAPE 2 position,
The iust-recorded signal from deck 1 is monitored by
switching the input selector [El to the TAPE 1 position.

Page 8

Tape deck 8

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Connecting an Audio Mixer or Graphic Equalizer
When the P-306RS is used with an audio mixer (mixing

console) or a graphic equalizer, connect the mixer or equal-

izer to the TAPE-1 or TAPE-2 terminals and set the input
selector IE! to the TAPE-1 or TAPE-2 position. Then set
the recording source selector [7| to the source to be mixed
or equalized.

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Interconnected Volume and Tone Adjustment
The P-306RS has been designed so that when the
volume is raised above a certain level, any bass or
treble tone emphasis will be gradually decreased as
the volume is raised.
This interconnected volume and tone adjustment
function operates when the bass [El and/or treble
IE control has been set above the center 0 position
and the volume control ml is raised above the 15
position (center position of the volume range). As the
volume control is raised beyond the 15" position,
the amount of bass and/or treble emphasis is gradual-
Iy decreased. When the volume control W is turned
fully clockwise, the frequency response will be
completely flat. For settings below 15, changes in
the volume level have no effect on tone control
settings. Furthermore, when the bass M and treble
[)5] controls are turned counterclockwise to the
low-cut and high-cut positions, changes in Volume
settings will no longer have any effect on the tone
control settings.

Trouble-shooting Guide

If the P-306RS fails to function normally, first check the
following points before calling for professional servicing.
If the problem still persists or is of a different nature
than the problems listed, disconnect the power cord and
contact your Onkyo dealer.

1. No power
Has the power cord been properly plugged into the wall
socket?

2. No sound when power is switched on

Check the power amplifier or speaker systems to be
sure the problem is not located there.

Check that the input selector El, phono selector IE]
and muting switch [El have all been set to the correct
positions. Also check for possible incorrect connection
of input and output cables and other breaks or short
circuiting. Note that as long as the Super Servo Integral
lamp remains off, muting circuits are activated to
prevent the output of sound.

3. Generation of hum, howling or other unwanted noise

Check for loose connection of the ground line in the
input and output cable connections. Also check the
ground connections to the power amplifier and
turntable.

Howling can be generated when the speaker systems are
too close to the turntable. Noise can also be picked

up if a power transmitter is used nearby. Hum can be
induced if connecting cables pass too close to the
power cord or power transformer.

4. Very low level output sound when playing records

The output level will be too low if the cartridge selector
I101 is set to the MM position when using an MC
cartridge. Check the type of cartridge being used.

ONKYO CORPORATION

International Division: No. 24 Morl Bldg, 23-5, NlShl-Shlmbashl 3-chome, Minalorku.
Tokyo lOS. Japan Telex: 242-3551 ONKYO J Tel. 0341326981

ON KYO U.S.A. CORPORATION

200 Williams Drive. Ramsey. N.J. 07446 Telex: 25-710-988-1033 Tel. 201-825-7950

0575671K7ASA Printed in Japan