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OPERATING INSTRUCTIONS
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SWITCHES AND CONTROLS
Treble Control —= -
The TREBLE control consists of two separate
knobs, one for each channel.
The TREBLE control does for the high frequen-
cies what the BASS control does for the lows.
To increase the intensity of the treble tones, turn
the TREBLE control clockwise. To decrease the
— treble loudness, turn the TREBLE control coun-
terclockwise.
Power Indicator —
The power indicator glows when the POWER
switch is pushed on. The indicator lamp remains
lit while the amplifier is on.
Bass Control —«-
The BASS control consists of two separate knobs,
one for each channel.
The BASS control is used to boost or to cut the
low-end response, according to your taste, spea-
ker response and listening conditions. With the
BASS control in the mid-position (marked 0), the
bass tone will sound exactly as recorded or broad-
cast. To increase the intensity of the bass tones,
turn the BASS control clockwise. To decrease
the bass loudness, turn the BASS control coun-
terclockwise.
Power On-oft Switch —
Power is applied to the amplifier when the
POWER switch is pushed. To turn off, push
the POWER switch again. The rear AC outlet
marked SWITCHED is controlled by this
switch.
Loudness Switch —=
This switch is used to compensate for the natural
hearing deficiency of the human ear in the
extreme bass and treble ranges at low listening
levels. When this switch is on. It converts the
VOLUME control to a loudness compensated
control. Switch it on to listen at low volume
levels.
HIGH FILTER
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Mode Switch
STEREO—Use this position for all stereo pro-
grams.
MONO—Use this position for all monophonic
programs. This position connects the left or
right input or the L+R program to both spea-
kers.
MODE SWITCH FUNCTION
STEREO SIGNAL \
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MONURAL SIGNAL Я
Selector Switch ——
This switch selects from among the various pro-
gram sources connected to the input jacks on the
rear panel of the amplifier. Below are the switch
positions and their functions:
TAPE HEAD—Selects a tape deck without
built-in pre-amplifier. The tape speed should be
19 cm/sec or 7% ips.
PHONO 1—Selects a record player connected
to the PHONO 1 inputs on the rear panel.
PHONO 2—Selects a record player connected
to the PHONO 2 inputs on the rear panel.
AUX 1 (MIC)—Selects a tuner, MPX adaptor
or microphone connected to the AUX 1 (MIC)
inputs on the rear panel.
AUX 2—Selects a tuner, MPX adaptor or other
components connected to the AUX 2 inputs on
the rear panel.
SWITCHES AND CONTROLS
Speaker Selector Switch — — ——
This switch enables you to choose between one
‘set of speakers (“A” system) and another set (“B”
system), which may be installed in the same room
or in another part of the house. It also has a
position for running all speakers at once, as well
as another that cuts them all out headphone
listening.
Headphones Jack —
This jack will accept any standard phone plug
but dynamic type stereo headphones are recom-
mended.
The headphones are used in conjunction with the
SPEAKER selector switch. This switch enables
you to listen over the headphones while keeping
main and/or remote speakers on or off. Head-
phones may also be used for tape monitoring.
High Filter Switch —
This FILTER is used to reduce record scratch,
tape hiss or other high-frequency noises.
Low Filter Switch —
The LOW FILTER is used to reduce turntable
rumble or other low-frequency noises.
Volume Control —=
The VOLUME control adjusts the over-all sound
level of both channels. To increase the volume,
turn the control clockwise.
BASS
LOW FILTER
Muting Switch —e -
This switch is used to suppress interstation
tuning noise or to reduce volume temporarily
during record playing. When this switch is on,
the volume is attenuated by 20db over the whole
frequency range.
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— YAPEHEAD, —
— SELECTOR
STEREOPHONIC AMPLIFIER.
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AU- 555
Balance Control —
This control is used to adjust for equal sound
levels from both left and right channels. To in-
crease the sound level on the right and decrease
the left, turn the contro! clockwise. To increase
the sound level on the left and decrease the right,
turn the control counterclockwise.
Tape Monitor Switch
This switch enables you to compare the recorded
tape with the original program. When the switch
is in the PLAY BACK position, the recorded
tape is heard from the loudspeakers. The moni-
toring process is only possible with a three-head
tape machine. IMPORTANT: When not in use,
make sure the switch is in the SOURCE position.
SPEAKERS
Two sets of any 4- to 16-ohm speakers can be used
with the AU-555. One set may be installed as the
main system, the other may be installed in any room
in the house. Both systems are controlled by che
SPEAKER selector on the front panel of the amp-
lifier.
Connection
No more than Y -inch of insulation should be re-
moved from the end ot a speaker cable, since any
greater length of exposed wire is likely to cause
shorts at the terminals on the rear of the amplifier.
All wire strands should be tightly twisted. As 1l-
lustrated below, push the jack button down and
hold with one hand, insert the end wires of the
speaker cable into the hole with the other hand,
and release the button.
RIGHT SPEAKER
LEFT SPEAKER
SPEAKER DAMPING
FACTOR SWITCH
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SPEAKER CONNECTION
XXX (Push the jack button down
Kl and hold with one hand,
o Insert the end wires of the
speaker cable into the hole
with the other hand, and
release the button)
RIGHT SPEAKER
One Speaker System
To connect the main set of speakers (SYSTEM-A)
to the amplifier:
1. Connect the (4) terminal of the speaker on your
right (as viewed from the listening position) to the
RIGHT SYSTEM-A (+) terminal on the rear of
the amplifier.
2. Connect the lead from the common speaker ter-
minal (marked —, C, G etc.) to the RIGHT SYS-
TEM-A (—) terminal on the rear of the amplifier.
3. Connect the (+) terminal of the left speaker to
the LEFT SYSTEM-A (+) terminal on the rear of
the amplifier. |
4. Connect the lead from the common speaker ter-
minal (marked —, C, G etc.) to the LEFT SYS-
TEM-A (—) terminal on the rear of the amplifier.
5. Turn the SPEAKER selector to SYSTEM-A.
Additional Speakers
Tf you wish to connect another set of speakers in
the same room or remotely, you can connect such
speakers to the SPEAKER SYSTEM-B terminals
of each channel as indicated in the preceding sec-
tion. When the SPEAKER selector is in the SYS-
TEM-B position, you will hear sound from the
speakers connected to the SYSTEM-B terminals.
With the selector in the A+B position, the sound
comes from all the speakers connected to the amp-
lifier
Phasing of Speakers
Stand about 10 feet in front of and midway between
the speakers and listen to any monophonic repro-
duction. If the speakers are correctly phased, the
sound will seem to come from between the speak-
ers. If the sound is not directly in front of you, the
speakers are incorrectly phased. To correct this,
switch the amplifier off and reverse the leads to one
speaker.
Damping Factor Switch
This switch enables you to select between two
damping factors in order to match the type of speak-
ers used. Set it to either its HIGH (d.f., 45) or LOW
(d.f., 12) position while actually listening to the
speakers in operation.
OPERATIONS
— RECORD PLAYER
— MICROPHONES
Record Player Connections
The following procedures are recommended for use
with a record player or turntable utilizing a mag-
netic cartridge with an output voltage between 2mV
and 10mV:
1. Connect the left channel output of a stereo turn-
table to the LEFT PHONO 1 (or PHONO 2) input
jack on the rear of the amplifier.
2. Connect the right channel output of the turn-
table to the RIGHT PHONO 1 (or PHONO 2) input
jack.
3. If a monophonic player or turntable is used, it
may be connected to either RIGHT or LEFT
PHONO input jack.
4. Plug the turntable’s power source cord into the
AC outlet marked SWITCHED on the rear of the
amplifier. The power supply for the turntable will
then be controlled by the POWER switch on the
front panel of the amplifier.
NOTE: A record player with a constant amplitude
cartridge such as crystal or ceramic is not recom-
mended for use with the AU-555 from a standpoint
of tone quality. If such a player must be used,
connect the output of the player to the AUX input
jack on the rear of the amplifier.
Operation
1. Turn the SELECTOR switch to PHONO 1 or
PHONO 2, depending on the turntable you wish to
hear.
2. Set the MODE switch to STEREO. If a mono-
phonic turntable is used, set the MODE switch to
MONO.
3. Switch the turntable ON, and select the correct
speed for the record to be played.
4. Place the needle on the record. When mono-
phonic records are played on a stereo player, follow
the same procedures as for stereophonic records for
better results.
5. Adjust the BALANCE control to obtain equal
sound from both right and left channels.
6. Use all other controls and switches according to
personal taste and listening conditions.
Humming and Howling
Care must be taken never to place a record player
on or too near a speaker enclosure. Otherwise the
vibration of the speaker enclosure is transmitted to
the player and causes howling. It is best to keep
these components completely separated, but if this
is impossible, to place a thick cushion between
them.
Humming is a phenomenon caused by incomplete
or incorrect player-amplifier connections. If this
occurs, check to make sure that all connections are
complete and that the connecting wire is sufficient-
ly thick.
Microphones
One or two microphones can be connected to the
MIC inputs on the rear of the amplifier. Use high-
impedance 10-k crystal, dynamic or velocity micro-
phones for optimum performance.
Connections
If two microphones are used, connect one to the
RIGHT MIC input and the other to the LEFT. If
only one microphone is used, connect it to either
RIGHT or LEFT MIC input.
Operation
1. Turn the SELECTOR switch to AUX 1 (MIC).
2. If two microphones are used, set the MODE
switch to STEREO or MONO for mixing the two
input signals. If only one microphone is used, set
the MODE switch to MONO.
3. Use all other controls and switches according to
taste and listening conditions.
NOTE:
* The amplifier can accept high-impedance micro-
phones only.
* Don’t use excessively long cable.
* Since the tone controls can be used separately for
each channel, the microphones can be used in the
best way even when one is for music and the other
for voice. The amplifier will have increasing uses
if programs from the microphones are to be record-
ed on tapes.
* Components connected to the AUX 1 inputs can-
not be used simultaneously with the microphones.
TAPE
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RECORD PLAYER (100K)
—— 10 —
FROM
RECORD
PLAYER
TO WALL OUTLET
OPERATIONS
— TUNERS
— PRE-AND MAIN AMPLIFIERS
Tuner Connections
a. Stereo Tuner—Connect the left channel output
of a stereo tuner to the left channel AUX-1 or AUX-
2 input, and the right channel output to the right
channel AUX-1 or AUX-2 input.
b. Monophonic Tuner—Connect the output of a
monophonic tuner to either right or left channel
AUX-1 (or AUX-2) input.
c. FM Tuner with FM-MPX Adaptor—Connect
the output of an FM tuner to the input of an FM-
MPX adaptor. The outputs of the adaptor should
be connected in the same manner as a stereo tuner.
Operation
Stereo Tuner
1. Turn the SELECTOR - switch to AUX 1 or
AUX 2.
2. Set the MODE switch to STEREO. |
3. Select the station desired with the tuning dial.
4. Use all other controls and switches according to
taste and listening conditions. |
Monophonic Tuner
1. Turn the SELECTOR switch to AUX 1 or
AUX 2.
2. Set the MODE switch to MONO.
3. Select the station desired with the tuning dial.
4. Use all other controls and switches according to
taste and listening conditions.
FM Tuner with FM-MPX adaptor
1. Turn the SELECTOR switch to AUX 1 or
AUX 2.
2. Set the MODE switch to STEREO.
3. Select the station desired with the tuning dial.
4. Set the FM-MPX adaptor to STEREO.
5. Use all other amplifier controls and switches ac-
cording to taste and listening conditions.
NOTE: Before connecting and operating the tuner
and FM-MPX adaptor, be sure to look up the man-
ufacturer’s information.
Pre-and Main Amplifiers
The AU-555’s pre- and main amplifier sections can
be used independently. To use in this manner,
remove the PM connectors from the jacks marked
PRE OUTPUT and MAIN INPUT on the rear of
the amplifier. An additional main amplifier can then
be connected to the PRE OUTPUT and an addi-
tional pre-amplifier to the MAIN INPUT. When
the additional pre-amplifier is connected, only the
SPEAKER switch is usable on the front panel of
the AU-555. Thus, tone and volume should be ad-
justed by means of corresponding controls on the
additional pre-amplifier. When an additional main
amplifier is connected, all the controls and switches
on the front panel of the AU-555 are usable.
Multiplex-channel Amplifier Stereo
The independent pre- and main amplifier sections
make the AU-555 more versatile. One of their most
exciting uses is for Multiplex channel Amplifier
stereo. In this stereo system, the woofer, mid-range
and tweeter response is divided on the input side of
the amplifier and each speaker has its own optimum
amplifier. The sound is superbly clean and natural,
with matchless fidelity.
—11 —
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OPERATIONS
—— TAPE RECORDERS
—— TAPE DECKS
Tape Deck and Tape Recorders
Á tape recorder can be connected to record from,
and playback through, the amplifier. A tape deck
without a built-in playback preamplifier can be
connected to playback through the amplifier. When
a 3-head tape recorder with separate recording and
playback heads is used, the quality of tape record-
ings made from the amplifier can be compared with
the source material while it is being recorded.
Tape Deck
To connect a tape deck without playback pre-
amplifier:
1. Connect the left channel output of the tape deck
to the LEFT TAPE HEAD input on the rear of the
amplifier.
2. Connect the right channel output of the tape
deck to the RIGHT TAPE HEAD input.
3. If a monophonic tape deck is used, connect it to
either RIGHT or LEFT input.
To listen totapes with tape deck:
l. Turn the SELECTOR switch to TAPE HEAD.
The TAPE HEAD indicator on the front panel of
the amplifier will glow.
2. Switch the tape deck ON.
3. If a monophonic tape deck is used, set the
MODE switch to MONO. If a stereo tape deck is
used, set the MODE switch to STEREO.
4. Adjust the BALANCE control to obtain equal
sound from both right and left channels.
5. Use all other controls and switches according to
taste and listening conditions.
Tape Recorders
Both DIN plug and pin jack tape recorders can be
connected to the amplifier.
Connection
DIN plug tape recorder—Plug into the TAPE/
PLAY socket near the upper left corner on the rear
panel of the amplifier.
Pin jack tape recorder—Connect the left channel
recording input of the tape recorder to the LEFT
REC jack and the right channel recording input to
the RIGHT REC jack. Connect the left channel
playback output of the tape recorder to the LEFT
MON jack and the right channel playback output
to the RIGHT MON jack.
Recording
1. Turn the SELECTOR switch to the program
source to be recorded.
2. If a stereo tape recorder is used, set the MODE
switch to STEREO. If a mono tape recorder is used,
set the MODE switch to MONO.
3. Switch the tape recorder ON and set its controls
for recording operation.
4. Use all other controls and switches as appropri-
ate.
Playback
l. Turn the TAPE MONITOR switch PLAY
BACK.
2. Switch the tape recorder ON and set its controls
for playback operation.
3. Use all other controls and switches of the amp-
lifier according to taste and listening conditions.
Monitoring
Same as above. (See “NOTE:” continued on P. 14)
—— 13 —
NOTE:
1. Tape recorded sound cannot be controlled by
the switches and controls on the front panel of the
amplifier. They control sound from the speakers
only.
2. For better results, record directly through the
AU-555, rather than through microphones placed
in front of the speakers.
3. When the TAPE MONITOR switch is not in
use, make sure the switch is in the SOURCE posi-
tion.
4. Tape recorders referred to in this section include
only those with built-in playback preamplifiers.
Those without should be connected and operated
as tape decks.
5. Tape monitoring is possible only with 3-head
tape recorders, 1.e., those with separate playback
and recording heads.
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— 14 —
MAINTENANCE
PM Connectors
Warning: Be sure to push the POWER switch
OFF before removing the PM connectors.
The PM connectors hook up the PRE OUTPUT
and MAIN INPUT terminals on the rear panel of
the amplifier so that the pre-and main amplifiers
can be used individually and separately. When the
PM connectors are removed, the pre-and main
amplifier circuits are opened. They should not be
removed except when connecting additional pre-
and/or main amplifiers for multi-channel stereo.
Refer to the section titled PRE-AND MAIN AMP-
LIFIERS.
If the Protector Circuit Lights Up...
It means that the AU-555’s circuit has been acti-
vated to cut incoming current as soon as it exceeds
the allowable limit to prevent the power transistors
from becoming damaged. When this happens, the
PROTECTOR circuit is closed and no sound comes
from the speakers. As soon as this happens, turn
off the amplifiers power supply for about 15 sec-
onds, then turn it back on. If all the speakers are
still silent, immediately turn the power off, locate
and eliminate the source of trouble. Probable cause:
a shorted output circuit or excessive input.
Quick-Acting Fuses
These fuses for right and left channels are also de-
signed to protect the power transistors by blowing
instantly if shorting occurs between connections at
the speaker terminals. If, after the POWER switch
is turned on and the POWER indicator lights up,
neither channel operates or only one operates nor-
‘mally, is either because one or both quick-acting
fuses have blown. In this case, remove the power
plug from its outlet, screw out the fuse on the print-
ed circuit board (F-1058) located inside the bonnet
of the amplifier, and check to see if the fuses are
blown. Replace them with identical 2 AGD fuses
after finding and eliminating the source of trouble
that caused them to blow.
— 15 —
Power Fuse
Should the amplifier fail to operate, the probable
cause is either a power stoppage or a blown fuse.
To check, remove the AU-555’s power plug from
its outlet, unscrew the fuse holder on the rear panel,
and remove the fuse. If it is blown, replace it with
a new glass-tubed fuse of the same capacity (ZA)
after determining and eliminating the trouble
source that caused the fuse to blow. Using wire or
a fuse of different capacity as a stop-gap measure is
dangerous and should be avoided.
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AC Outlets
Two AC outlets have been provided on the rear
panel of the amplifier to serve as power supply
sources for tape recorders, record players or other
components used with the AU-555. The upper out-
let marked SWITCHED is controlled by the POW-
ER switch on the front panel of the amplifier.
Wire Connections
When connecting tape machines, record players or
other components to the AU-555, be sure to use
shielded wire. The use of an ordinary cord or vinyl
wire may cause humming and buzzing. The length
of the shielded wire should be shorter than 5 feet.
Be sure that all lead wires between the amplifier
and components are properly connected. If the con-
nections are loose or in touch with other parts, the
amplifier will not function properly, may pickup
noise, and even breakdown over a period of time.
Also, be sure to read the manufacturer’s instruc-
tions for anv component before connecting it to the
AU-555.
SOLDERING THE LEAD TO THE PIN-PLUG
— 16 —
MAINTENANCE
Grounding
Connect one end of vinyl or enameled wire to the
terminal screw marked GND on the rear of the
amplifier, attach a copper plate to the other end, and
bury it underground. Whenever an outdoor AM
antenna is used, grounding becomes necessary. In
all cases, grounding is desirable since it allows a
better S/N ratio to be obtained. To ground an
entire audio system, connect the grounding wire of
each component used to this terminal.
dg 7 7 74 OS
COPPER PLATE
BURIED UNDERGROUND.
Voltage Selecting Plug
This plug is located inside the bonnet of the ampli-
fier and has been set to the voltage of your area
prior to shipment. If the amplifier is ever moved
to an area with another voltage requirement, this
plug must be changed to the proper voltage of the
new area. To change, remove the bonnet from the
amplifier, remove the plug from the voltage socket
you have been using, and plug the arrow head into
the appropriate voltage requirement of 100V, 117V,
220V or 240V.
Location
Transistors are relatively susceptible to heat. Al-
though proper ventilation for cool running 1s one
of the design considerations of the AU-555, some
simple precautions are necessary:
1. If the amplifier is installed in a cabinet, leave
sufficient open space on all three sides of the unit
for adequate ventilation.
2. If the amplifier is installed on an open shelf
without a cabinet, keep it out of direct sunlight.
— 17 —
Phasing
The right and left speakers must be properly
phased. The speakers for the two channels must
push the sound wave out together. If one pushes
while the other pulls, there is sound cancellation
at some frequencies or in some listening locations.
Incorrect phasing is evidenced by loss of bass
when you are listening to a monophonic record
on a stereo record player at a point midway be-
tween the two speaker systems. If incorrect,
reverse the speaker connections (+ and —) of
either speaker system.
Where to Place
Since transistors are extremely susceptible to heat,
the AU-555 has been designed to diffuse heat
through the top and rear of its case. Therefore,
special consideration should be given to where it
will be used before installing the tuner. It should
not be operated in a place where it is exposed
directly to the sun, near radiators or other heat-
generating sources, and it should never be mounted
in an air-tight cabinet. Finally nothing should be
placed on top of it.
Damping Factor Switch
This switch enables one of two damping factors to
be selected to match the type of speaker system
used. Set it to either its HIGH (DF 45) or LOW
(DF 12) position while actually listening to the
speakers in operation.
— 18 —
SPECIFICATIONS
CHARACTERISTICS
MAIN AMP. SECTION
POWER OUTPUT
MUSIC POWER (IHF): 60W at 4 ohms
50W at 8 ohms
CONTINUOUS POWER (each channel):
25/25W at 4 ohms
20/20W at 8 ohms
HARMONIC DISTORTION: Less than 0.5%
INTER MODURATION DISTORTION
(60 Hz; 7,000 Hz=4:1) Less than 0.8%
POWER BANDWIDTH: from 20 to 30,000 Hz at 8 ohms
(0.59 distortion)
FREQUENCY RESPONSE: from 20 to 80,000 Hz +1db
(at normal listening level.)
CHANNEL SEPARATION: better than 50db
HUM AND NOISE(IHF): — better than 100db
INPUT SENSITIVITY: 1V at rated output
OUTPUT IMPEDANCE: from 4 to 16 ohms
DAMPING FACTOR: 12 and 45 at 8 ohms load
INPUT IMPEDANCE: 100 K ohms
SPEAKER SELECTOR SWITCH: 1) OFF 2) A 3)B
4) A+B
PRE AMP. SECTION
OUTPUT VOLTAGE
MAXIMUM OUTPUT VOLTAGE: 3v
RATED OUTPUT VOLTAGE: 1 V (1502)
HARMONIC DISTORTION: Less than 0.1% at rated
output voltage
FREQUENCY RESPONSE: from 20 to 50,000 Hz +1db
HUM AND NOISE (IHF) (at rated output voltage)
VOLUME AT MINIMUM: better than 100db
PHONO 1 AND 2: better than 80db
TAPE HEAD: better than 75db
AUX 1 AND 2: better than 80db
INPUT SENSITIVITY (for rated output: at 1,000 Hz)
PHONO 1: 2 mV (47 K ohms)
PHONO 2: 2 mV (100 K ohms)
TAPE HEAD (19 cm/s): 1. 5 mV (200 K ohms)
AUX 1: 200 mV (100 K ohms)
MIC: 3.5 mY (10 K ohms)
AUX 2: 140 mY (100 K ohms)
TAPE MONITOR: 150 mY (100 K ohms)
RECORDING OUTPUT (at rated input): 140 mV
CONTROLS AND SWITCHES
BASS CONTROL: 20 Hz + 16db~—16db
TREBLE CONTROL: 20,000 Hz + 13db~—13db
LOUDNESS CONTROL: 50Hz 4-8db, 10,000Hz +2.5db
(volume control at —30db)
LOW FILTER: 30 Hz, — 12db
HIGH FILTER: 20,000 Hz — 10db
MUTING SWITCH: —20db (20--20,000 Hz)
MODE SWITCH: 1) STEREO 2) MONO (L+R)
SELECTOR SWITCH: 1) TAPE HEAD (19 cm/sec)
2) PHONO 1 3) PHONO 2
4) AUX 1 (MIC) 5) AUX 2
TAPE MONITOR SWITCH: 1) SOURCE 2) PLAY BACK
OTHER SPECIAL FEATURES
Direct tape monitor. Headphones jack. Muting switch.
Main-amplifier input jack. Pre-amplifier output jack.
DIN connector for tape recorder.
Mic input (AUX 1). DF Control switch.
TRANSISTORS AND DIODES
TRANSISTOR: 22
DIODE: 6
THERMISTOR: 4
S.C.R.: ]
POWER REQUIRMENTS
POWER VOLTAGE: 110V, 117V, 220V, 240V.
50~60 Hz
POWER CONSUMPTION: 120VA (at max. signal)
DIMENSIONS
WIDTH: 157
HEIGHT (Excluding rubber stand): 43/;”
DEPTH (Excluding Knob): 107/43”
WEIGHT
WEIGHT: 17.4 lbs
— 19 —
MUSIC POWER {IM DISTORTION
INPUT =AUX2 (140mV)
OUTPUT =8Q
FREQUENCY =1,000Hz
INPUT = AUX 2 (140mV)
QUTPUT= 80
FREQUENCY= 60Hz + 7000Hz
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POWER (W)
|
POWER (W)
POWER BANDWIDTH
INPUT = AUX 2
QUTPUT=80
OdB=20W 05%
POWER OUTPUT HARMONIC DISTORTION
x | INPUT = AUX 2 (140mV)
| — | OUTPUT =892
FREQUENCY
-——— 30Hz
—— 1,000Hz
—-— 15,000Hz
RESPONSE (ab)
—
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FREQUENCY (Hz)
DISTORTION (%)
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POWER (W1
DAMPING FACTOR
OUTPUT =8Q
DAMPING FACTOR SWITCH
HIGH
DAMPING FACTOR
K
FREQUENCY (Hz)
* All rights reserve specifications subject to change without
notice.
— 20 —
GENERAL TROUBLESHOOTING CHART
HOW TO USE THIS SERVICE MANUAL
The troubleshooting charts in this manual help you isolate the cause of the trouble to a particular unit or part.
If you can identify the nature of the trouble with that in these charts and can find the part number in the
column under the CHECK POINT, look up the PARTS LIST on page 29~34. Following each part number in
the PARTS LIST are number-letter combinations indicating the position of the part on the circuit diagram
and the printed circuit sheet. These co-ordinate numbers and letters appear along the outer edge of the circuit
diagram and the printed circuit sheet diagram in this manual. The numbers run from top to bottom and the
letters from left to right. Finally, repair or replace the defective part.
In some instances, the amplifier which is operating satisfactorily develops hum or noise as listed on this page.
In this case, eliminate the trouble source as indicated in the column under WHAT TO DO.
If you are confronted with a trouble not covered here or if you have any questions concerning the operation
and maintenance of this amplifier, please contact our Customer Service Department.
It the amplifier is operating satisfactorily, the trouble may be attributed to the following:
1. Incorrect connections to or loose terminal contact with the speakers, record player, tape recorder or deck,
line cord etc.
2. Incorrect operation of the amplifier and/or other components.
3. Improper positioning of the components such as speakers and record player.
4. Defective component or components connected to the amplifier.
The next step to do is listed below:
RRE SYMPTOM PROBABLE CAUSE WHAT TO DO
Tuner Noise is heard continuous- | * Discharge or oscillation Attach a noise limiter to the electri-
ly or intermittently at a
particular time of a day or
In a certain area.
caused by electrical appli-
ances, such as fluorescent
lamp, TV set, a.c. motor,
rectifier, oscillator etc.
Insufficient antenna input or
reception in fringe area
Wave interference
Natural phenomena, such as
atmospherics, statics, strays
and thunderbolt
cal appliance that causes the noise,
or attach it to the tuner.
Keep the said electrical appliance
well away from the tuner.
Install an outdoor antenna and
ground the amp to raise the signal-
to-noise ratio.
If the noise occurs at a certain fre-
quency, attach a wave trap to the
ANT input.
Reverse the power cord plug-recep-
tacle connections.
During AM reception,
noise is heard at a partic-
ular time of a day, in a
certain area or over part
of dial.
Field intensity of AM sig-
nals
Reset AM antenna for better recep-
tion
Ground the amp, or reverse the power
cord plug-receptacle connections.
High-frequency noise 18
heard during AM recep-
tion.
Beat interference, i.e., 1n-
teraction of two stations
closely spaced
TV set close to the audio
system
—— 21 —
The noise caused by beat interfer-
ence cannot be completely elimi-
nated. But it is advisable to turn
the TREBLE control to the minimum
counterclockwise position and turn
the HIGH filter
Keep the TV set well away from
the audio system.
PROGRAM
SOURCE
SYMPTOM
PROBABLE CAUSE
WHAT TO DO
Noise during FM reception
* Poor noise limiter effect or
too low S/N ratio due to
insufficient antenna input
Note: FM reception is affected considerably by the condi-
tions of transmission by stations: power and antenna
efficiency. As a result, you may receive one station
quite well while having difficulty in receiving another
station.
Install the antenna for maximum
signal strength.
If this does not prove effective, use
an outdoor antenna designed exclu-
sively for FM.
When you make use of an existing
TV antenna for this purpose, attach
a divider to prevent interaction.
Note that excessively long antenna
may rather cause a noise.
Noise is heard suddenly
during FM reception.
Ignition noise caused by
starting of an automobile
engine
Keep the antenna and its lead-in
wire well away from the road side.
Or raise the antenna input as de-
scrived above.
Noise is heard during FM
stereo reception while
being not heard during FM
mono.
The service area of FM
stereo broadcast is only half
as much as that of the FM
mono.
Install the antenna for maximum
antenna input.
Turn on the HIGH filter and/or turn
the TREBLE control to the minimum
counterclockwise position.
Record player,
tape recorder or
deck
Hum or howling
Record player placed direct-
ly on the speaker box
Connecting wire not shield-
ed
Loose terminal contact
Connecting cord too close to
the power cord, fluorescent
lamp or other electrical ap-
pliances
Nearby amateur radio sta-
tion or TV transmission
antenna
Put a cushion between record player
and speaker box or keep them away
from each other.
Use shielded cord.
Switch on the LOW filter and/or
turn the BASS control from midpoint
to left.
Make connecting cord as short as
possible.
Connect cord tightly at terminals.
Keep connecting cord well away
from them.
Consult the nearest Radio Regula-
tory Bureau.
Common to all
program sources
Surface noise
Worn or old record
Worn or dusty pickup
needle.
Improper needle pressure
Turn the TREBLE control properly
from mid-point to left and/or switch
on the HIGH filter.
Adjust the needle pressure.
The BALANCE control is
not at the midpoint when
equal sound comes from
left and right channel.
The BALANCE control is
not always set to the mid-
point depending the source
materials.
Proper balance exists when the sound
seem to originate at a point midway
beween the speakers.
—— 22 —
PARTS LAYOUT
dd EEE
OE
head
DISASSEMBLY PROCEDURE
Bonnet
[e О A _L© 4 | ' Bottom panel
— = 9 7 AP TT o
DS un | В
D N |
С N |
Knob a
| | IN Front panel
— — 24 -—
MOUNTING TEMPLATE
~ This diagram shows the size and dimensions required for moun-
ting the AU-555 into a custommade cabinet. Note that ample
space is provided for complete air circulations above and below
the tuner.
1. Be sure the cabinet window measures 14/47 Xx 4%” as indi-
cated in the diagram.
2. Place two boards on the floor of the cabinet as illustrated
Boards should measure %” x 2%” x 7%”.
3. Drill two holes in the bottom of the cabinet at points corre-
sponding to holes in the bottom of the tuner.
4. Take off the bonnet.
5. Remove the four rubber feet from the AU-555.
(Retain for future use.)
6. Insert the AU-555 into the cabinet through the window until
the edges of its front panel are flush with the cabinet, and secure
both tuner and cabinet with washers and butterfly bolts provided
Width of front panel board
380% 1481
|
+ 37214 21” |
Front width of cabinet window |
|
5”
32
| + À "fn
ap
@
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" * A
1) | 20mm 022"
235"m9-4-" -
т 275710 83” -
=
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Minimum dimension
140% 53 7.
5
Sa
+ 0 |
En * | |
E 1087 —| | [108 "m5
5 307%
m7 ol
= ET | 200 fn 7 2 |
4871 577 В
| Minimum dimension
30071113”
—- 25 —
BLOCK DIAGRAM
Foor
— OA В;
OUTPUT
Ba D
ar PT
TReo2 TReo4
не — — — = — | —— —]—]
TReoi TReos VR701 VR703 ТВто! TR7os TREBLE TR705 | e TReos :TReos
TAPE HD Sia. | | в © 2 Sey Se: SPEAKERS DAMPING
© en Sib а , > y ES > 9 So: SPEAKERS
PHONO 1 @= | Sea a | NE x | и
( | o ©
| МЕ y jo | E TRgor TRso3 vip 3, Tíeo7 TRen
PHONO 2 @— | © | PIN I, 2 032 a X)
| | | + || |S5a | | оао F-1060 < DC UU
MIC | | | | | | Spa ^^ = BALANCE Е
Si IS | bo | о < Zi =
AUX | Hi 2 | a nl al x! > | 80
O1 O i 1 | à LJ) 43| AC BALANCE 77
Si E18 Bh SI
AUX 2 и] in = Ве ЗЕ E |
| | ı Sulz 3! 3 i T
TAPE REC Г Si © E о 3 5
a EST E y sm >
| 7
| | !
| | [ol |
| | Pol
| | | | |
|
TAPE HD(C-——o«——
TT |
Sic o } | 0)
PHONO 1 55 sll | vg TVR
NF
PHONO 2 L = 5 9 +
MIC | | > Pee > | >
VR802 R
AUX | | AC BALANCE _ | Dooz
AUX 2 , F-1064 F-1058 J
TAPE REC (© а |
TAPE MONE |
7
30r
(+22)
201 > 20Weo
(12.65V)
10 +22
(+05) —
of 05 — JD» PRE OUTPUT
© (iv)
w —lof | +23
AUX-1 (-14) (P0OmV _
2 — 4) (200mv) (—16.5) № ТАРЕ ВЕС
© —2ol AUX\ TAPE MON(-16.5)/(150mV) -e (150mV)
A -2
e
—30
—40
(3.5mv)
-50
PHONO (-54) /(2mv)
-60-7APE HD (-56.5) (1.5mv)
— 26 —
ALIGNMENT
MAIN-AMP SECTION OUTPUT
ADJUSTMENT
MAIN-AMP SECTION CURRENT
ADJUSTMENT
CONNECTIONS
STEP 2 ALIGN REMARKS
1. | Set VOLUME control to | Oscilloscope req-
minimum. uired: oscillation
frequency of 20 to
2. Set oscillator to 1,000Hz | 20,000 Hz and out-
and connect it to AUX 2 | put voltage of more
of channel L. than 2000mV.
3. | Set FUNCTION selector | When measuring,
switch to AUX 2 BALANCE control
to mid-position,
4. | Connect a 8-ohm (or 16- | TAPE MONITOR
ohm) load resistor (mini- | switch to SOURCE,
mum rating of 30 watts) to | MODE switch to
SYSTEM A LEFT speak- | STEREO, TONE,
er terminal. controls to 0 and
Е other accessory
5. | Set SPEAKER selector | switches to OFF
switch to SYSTEM A. position.
6. | Connect oscilloscope to
speaker terminal.
7 Turn POWER switch ON;
turn VOLUME control
clockwise little by little;
and check output at speak-
er terminal by using
oscilloscope.
8 Adjust VReo: so that both
crests of output wave form
are clipped.
For channel R, follow
same procedure as above.
In Step 8, adjust VRgog for
clipped crests of output
wave.
A
\/
AMMETER
STEP | (TESTER)
CONNECTIONS
& ALIGN
REMARKS
4. Set to
100mA
range.
7 Set to
100mA
range.
Remove Foo; and F 003
Set VR 603 and VReos
to minimum clockwise
position.
Turn POWER switch
ON.
Set ammeter in place
of Fooı. Connect its @
terminal to 8], and its
O terminal to 8C in
schematic diagram.
. Turn VR 603 and adjust
“current to. 22=26.mA
at room temperature of
less than 25°C and to
18-22mA at more
than 25°C.
Turn POWER switch
OFF and reset Foot fo
its original position.
Turn POWER switch
ON and set ammeter 1n
place of Foog. Connect
its @ terminal to 81,
and its © terminal 8C
in schematic diagram.
Turn VReo. and adjust
current to 22—26mA at
room temperature of
less than 25°C and to
18~22mA at more
than 25°C.
Ammeter
required:
100mA or
50mA range
Be sure to
turn
POWER
switch on
and then
connect am
meter.
— 27 -—
MAIN AMP ALIGNMENT
— 28 —
PRINTED CIRCUIT SHEETS
AND PARTS LIST
HEAD AMP <F-1064>
X: Parts No Y: Parts Name Z: Position of Parts
(Co-ordinate number and letter in printed circuit)
X Y X Y Z
Reo1 2.2K0 MW +10% Carbon Resistor 2A R630 22K) YYW +10% Carbon Resistor 1C
Reo2 2.2KQ KW +10% Carbon Resistor 1A R631 15KQ MW +10% Carbon Resistor 2C
R603 680KQ KW +10% Carbon Resistor 2A К632 15KQ MW +10% Carbon Resistor 1B
CAE co ae wim oo
R606 220K) GW +10% Carbon Rrsistor 1A сво Lop 15 WV Tantalum A
A C603 150pF +10% 50 WV Mica 2A
R607 2.2KQ KW +10% Carbon Resistor 2A Cos 150pF +10% 50 WV Mica LA
Réos | 2.2KQ YW +10% Carbon Resistor TA Coos 290 uE a 6.3 wy Electrolytic oA
R609 270KQ KW +10% Carbon Resistor “ZA E - Condenser
Ré10 270K) KW +10% Carbon Resistor 1A C606 220 uF 6.3 WV Hectrolylie denser 1A
Ré11 8.2KQ KW 10% Carbon Resistor 28 C607 47pF +10% 50 WV Mica 2A
R612 8.2K) KW 10% Carbon Resistor 1B C608 47pF E10% 50 WV Mica 2A
R613 2200 MW +10% Carbon Resistor 2A C609 10 4 s0 wy Eectralyic uo 12B
Ré14 2200 KW £10% Carbon Resistor 1A Celo TOuF 50 Wy Hectrolytic 1B
Reis | 5600 ZW £10% Carbon Resistor 28 Electralyíio 9
R616 5600 MW 10% Carbon Resistor 1B Сет! 47 pr 6.3 WV Condenser | 2A
R617 82KQ YW +10% Carbon Resistor 28 Cer? 47 pf 6.3 Wy Hectrolvtie PTA
R618 82KM KW 10% Carbon Resistor 1B Cé13 0.004uF E10% 50 WV Mylar 2B
Ré19 1000 MW +10% Carbon Resistor 2C C614 0.0044F +10% 50 WV Mylar 1C
R620 1000 YW +10% Carbon Resistor 1B C615 0.014F £10% 50 WV Mylar 2C
R621 4700 YW +10% Carbon Resistor 2B Cé16 0.014F +10% 50 WV Mylar 18
Ré22 47200 KW +10% Carbon Resistor 1B Ce17 0.0033uF +10% 50 WV Mylar 2C
R623 47MQ YW +10% Carbon Resistor 2B C618 0.00334F £10% 50 WV Mylar 1C
Ré24 | 4.7MO MW £10% Carbon Resistor IC
R625 12KQ KW +10% Carbon Resistor 2B TReor | 25C458LG© 030531-1 |2A
R626 12KQ MW 10% Carbon Resistor 1C TRe02 25C458LGO 030531-1 TA
Rez | 470KQ YW *10% Carbon Resistor 2C TR603 | 25C458LG© 030831] 1 2A-
R628 470KQ ZW +10% Carbon Resistor 1C .
R629 22KM GW. +10% Carbon Resistor 2C TR604 25C458LG© 03083101 ТА
А В С
— 29 —
CONTROL AMP <F-1060> X: Parts No Y: Parts Name Z: Position of Parts
(Co-ordinate number and letter in printed circuit)
X Y Z X Y Z
R705 47KQ MW +10% Carbon Resistor | 2A C711 47 uF 6.3 WV Hectrolytie © | 2 В
1 o :
R707 68K) Vw +10% Carbon Resistor : 2A C713 0.001 uF +10% 50 WV Mylar 2B
R709 220K ZW Æ10% Carbon Resistor 1A C715 10 4F 25 WYy Electrolytic | 18
R711 1.5KQ YW +10% Carbon Resistor 2A Electro rr
ec |
R713 220K KW +10% Carbon Resistor 2A Criz 33 uF 25 Wv "Condenser | 2B .
R715 5.6KQ YW £10% Carbon Resistor “1A | C719 0.0015uF +10% 50 WV Mylar 1B
R717 22KQ KW +10% Carbon Resistor 2 A Cra 0.047uF +10% 50 WV Mylar 1c
R719 1.5KQ YW +10% Carbon Resistor 2B C723 0.0474F £10% 50 WV Mylar IC
R721 10KQ ZW 10% Carbon Resistor 1B Cras 104F 25 wy Flectrolvlic 28
R723 4,7KQ AN + 10% Carbon Resistor 1B C727 1077 10 WV Flectrolytie Danser 2 В
2 =
R725 10KQ2 Ww +10% Carbon Resistor 1B C799 47 pF +10% 50 WV Mica 2C
R727 10KQ YW +10% Carbon Resistor 1C Ca 47 uF 6.3 Wy Electrolytic 2C
R729 680KQ KW +10% Carbon Resistor 1C elect er ondenser
ro !
R731 | 330K) YW +10% Carbon Resistor 2C C733 3.34F 25 WV 7" denser | 2C
R733 5.6KQ KW +10% Carbon Resistor 1C
R735 3.3KM ZW +10% Carbon Resistor 28 TRo1 | 2SC458LG(C) 030531-1 | ЗА |
R737 | 100KM JW +10% Carbon Resistor 2C TR703 | 2SC458L(B, С) edo | 2А |
R739 330KQ KW +10% Carbon Resistor 1B 030542
TR705 25C458L(B, C) 030542-1 | 2C
C7os 0.0154F 10% 50 WV Mylar 2A
C707 0.22pF +10% 50 WV Mylar 2A VR705 | 100KQ(B) 100018 | ТА
С709 47pF +10% 50 WV Mica ТА VR707 | 100K0(8) 100018 | 1C
S10 Joo1 Rg49 | Se(a-b) Sala-b) S5(a-b) S3 S
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