Nakamichi PA-7II User manual

Nakamichi
PA-71/PA-St
Power Amplifier
Owner’s Manual
Bedienungsanleitung
Mode d'emploi
This Owner's Manual covers the foliowing models:
Diese Bedienungsanieitung gilt fiir die foigenden Modeile:
Ce mode d’emplci couvre les modéles suivants:
FA-7t PA-7Ar PA-7Er |
PA-Si PA-SAr PA-SEn

Owner’s
Manual
Supplement
for
PA-7EII/PA-5EI
|
Beilageblatt
zur
Bedienungsanleitung
des
PA-7EI/PA-5EIL
Supplément
du
manuel
du
propriétaire
pour
PA-7EI/PA-5EI
This unit has two types of speaker terminals on
the
rear
panel,
which
are
designed
to
accept
vari-
ous kinds of speaker cable.
The
rear
panel
description
and
the
procedure
for
connecting
loudspeakers
is
therefore
slightly
defferent
from
the
contents
of
the
Owner's
Manual.
Please
follow
the
instrucitons
in
this
supplement
regarding these
points.
All
other
items
are
exactly
as
described
in
the
Owner’s
Manual.
‘Controls and Features
(Rear Pane!)
[PA-7EII] ° © ©
Diese Ger&teausftihrung besitzt zwei unter-
schiedliche Sets von Lautsprecheranschliissen
auf der Riickseite, die fiir verschiedene Laut-
sprecherkabel geeingnet sind.
Die Beschreibung der Gerdateriickseite und die
Anleitung zum Lautsprecheranschiu8 unter-
scheidet sich daher etwas von der Bedienungs-
anleitung. Beachten Sie hierzu bitte die Hin-
weise in diesem Beilageblatt. Alle anderen
Punkte sind genau wie in der Bedienungsanlei-
tung beschrieben.
Gerdtebeschreibung
(Riickseite)
[PA-5E1i]
F Banakamichi
Cette unité présente deux types de bornes de
haut-parleur sur le panneau arriére, lesquels
sont con¢us pour accepter divers types de cable
de haut-parleur.
La description du panneau arriére et la procé-
dure pour brancher les haut-parleurs sont par
conséquent légérement différentes du contenu
du Manuel du Propriétaire. Nous vous prions
donc de suivre les instructions de ce supplé-
ment en ce qui concerne ces points. Tous les
autres items sont comme décrits exactement
dans le Manuel du Propriétaire.
Commandes et particula-
~ rités (panneau arriére)
® 6 6
@ Right-Channel Speaker Terminals A
® Input Terminals (L, R)
@ Left-Channel Speaker Terminals A
@ Right-Channel Speaker Terminals B
® AC Line Fuse
® Power Cord
@ Left-Channel Speaker Terminals B
@® Heatsink
‘Connections
@ While making connections, be sure to set the
power switches of this unit. and all other
components to “OFF”
Ha Speaker Connections
Connect the left-side loudspeaker to the left-
channel speaker terminals and the right-side
loudspeaker to the right-channel speaker termi-
nals of this unit,-taking care to observe. correct
(+) and (—) polarity. If the polarity of one speak-
er is reversed, the speakers will be out of phase,
causing a loss in bass response and unstable, ir-
regular stereo imaging. Double-check to make
sure that both speakers have the same polarity.
This unit provides two types of speaker termi-
@ Lautsprecheranschliisse A fiir rechten Kanal
© Eingangsbuchsen (L, R)
@ Lautsprecheranschliisse A fiir linken Kanal
@ Lautsprecheranschliisse B fiir rechten Kanal
© Netzstrom-Sicherung
© Netzkabel
10) Lautsprecheranschlisse B fiir linken Kanal
@® Kihlkérper
Anschliisse
@ Achten Sie darauf, daB die Netzschalter aller
Gerate ausgeschaltet sind, wahrend Sie die
Verbindungen vornehmen.
@ Lautsprecneranschitisse
Verbinden Sie den linken Lautsprecher mit den
Lautsprecherklemmen fiir den linken Kanal und
den rechten Lautsprecher mit den Lautsprecher-
klemmen fiir den rechten Kanal auf der Gerate-
riickseite. Achten Sie dabei unbedingt auf kor-
rekte (+) und (—) Polaritét. Wenn die Polaritat
eines Lautsprechers vertauscht ist, sind die
Lautsprecher night in Phase, was zu beeintrach-
tigter BaBwiedergabe und unsauberem, ver-
schwommenem Stereo-Klangbild fiihrt. Fihren
@ Bornes de haut-parleurs A de canal de droite
© Bornes d’entrée (G, D)
@ Bornes de haut-parleurs A de canal de
gauche
@ Bornes de haut-parleurs B de canal de droite
@ Fusible de Prise de Courant
© Cordon d’alimentation
@ Bornes de haut-parleurs B de canal de
gauche
® Refroidisseur
Branchements
@ Tout en exécutant les branchements, veiller a
bien régler les commutateurs d’alimentation
de cette unité et les autres composants sur
“OFF” (arrét).
mi Branchements des haut-parleurs
Brancher le haut-parleurs cété gauche aux
bornes de haut-parleur du canal de gauche et le
haut-parleur cété droit aux bornes de haut-
parleur du canal de droite de cette unité, en fai-
sant attention a respecter la polarité correcte
(+) et (—). Si la polarité d'un haut-parleur est in-
versée, les haut-parleurs seront hors de phase,
ceci causant une perte de la réponce des basses
et une image stéréo irréguliére et instable. Con-
trdler deux fois pour s’assurer que les deux haut-

nals. Choose the terminal which is best suited for
the speaker cable you intend to use.
Speaker Terminals A
These terminals are suitable for use with speaker
cables having Y-shaped lugs or other special
connector tips (refer to Fig. 1).
Speaker Terminals B
These terminals are suitable for use with very
heavy gauge speaker cables (up to a diameter of
6 mm) (refer to Fig. 2).
@ By using both sets of speaker terminals
together, bi-wiring (connecting mid/high
range drivers and low range drivers to the
amplifier with separate cable) is possible.
@ The amplifier does not provide a facility for
switching between speaker terminalis A and
B. The same signal is always supplied at both
sets of terminals. If two different sets of
loudspeakers are connected in parallel,
take care not to drive them to excessive
volume levels.
® {t is recommended that you use high-quality,
heavy-gauge speaker cable with low resis-
tance, designed specially for audio applica-
tions. Using thin cable with high resistance
may impair sound quality and prevent the
amplifier from delivering its full potential.
® The speaker cables for both channels should
be approximately equal in length, as a
marked difference can result in improper lef-
t/right balance.
Sie nach -beendetem Anschiu8 nochmais eine
Uberpriifung durch, um ganz ganz sicher zu
gehan, daB die Polaritat beider Lautsprecher
Ubereinstimmt.
Dieses Gerat besitzt zwei Sets von Lautspreche-
ranschiiissen. Wahien Sie den fiir das verwen-
dete Lautsprecherkabel am besten geeigneten
Klemmentyp aus.
Lautsprecheranschliisse A
Diese Klemmen eignen sich fiir Kabel, die mit Ka-
belschuhen oder anderen spezielien
AnschluBvorrichtungen versehen sind (siehe
Abb. 1).
Lautsprecheranschliisse B
Diese Kiemmen eignen sich fiir Kabel mit beson-
ders groBem Querschnitt (bis 6 mm) (siehe Abb.
2).
@ Durch Verwendung beider Anschilisse zu-
sammen k6nnen_ Mittel/Hochton-Einheiten
und Tieft6ner bei dafiir vorgesehenen Laut-
sprechern durch separate Kabel mit der End-
stufe verbunden werden.
® Es ist night mdglich, zwischen den beiden An-
schilissen A und B umzuschalten. Das
gleiche Ausgangssignal liegt immer an
beiden Anschliseen. Wenn zwei Lautspre-
cherpaare parallel angeschiossen werden,
sollte darauf geachtet werden, die Laut-
stdrke nicht ibermaBig zu erhéhen.
® Es ist empfehlenswert, hochwertiges Laut-
sprecherkabel von groBem Querschnitt und
geringem Widerstandswert zu verwenden.
Bei Gebrauch von diinnem Kabel mit hohem
Widerstand kann die Klangqualitat beein-
trachtigt werden und die Endstufe wird u.U.
nicht ihre volle Leistung erbringen.
@ Die Lange der Lautsprecherkabel sollte fir
beide Kandle etwa gleich sein, da ein
groBerer Unterschied die Links/Rechts-
Balance beeintrachtigen kann.
Speaker Connection Example
Beispiel fiir Lautsprecherkabel-AnschiuB
Exemple de branchement de haut-
parleurs
Tighten
Fest zudrehen
Serrer
Fig. 1
Abb. 1
Fig. 1 e
Fig. 2 Tighten
Abb. 2 Fest zudrehen
Fig. 2 Serrer
is
Préamplificateur
Preamplifier go
Vorverstarker
oe
O
6)
e)
‘@)
‘@)
CQ
a
parieurs présentent la méme polarité.
Cette unité présente deux types de bornes de
haut-parleur. Sélectionner fa borne qui est plus
appropriée au cable de haut-parleur devant étre
utilisé.
Bornes de haut-parleur A
Ces bornes sont appropriées a l’usage avec des
cables de haut-parleurs ayant des cosses de
forme “Y” ou autres extrémités de connecteur
spécial (se référer a fa Fig. 1).
Bornes de haut-parleur B
Ces bornes sont appropriées a l’usage avec des
cables de haut-parleurs ayant un gros calibre
(jusqu’a un diamétre de 6 mm) (se référer a la
Fig. 2).
®@ En utilisant deux jeux de bornes de haut-
parleur ensemble, le cablage double (con-
-nexion de drivers de plage moyenne/élevée
et drivers de plage basse a |l’amplificateur
avec cable séparé) est possible.
e Lamplificateur ne fournit pas de possibilité
de commutation entre les bornes A et B de
haut-parleur. Le. méme signal est toujours
fourni au deux jeux de bornes. Si deux jeux
différents de haut-parleurs sont con-
nectés en paralléle, faire attention a ne
pas les commander a4 des niveaux de
volume excessifs. :
@ || est recommande d’utiliser un cable de gros
calibre et de haute qualité avec basse résis-
tance congu spécialement pour des applica-
tions audio. L'utilisation d’un cable mince
avec hauie résisiance peut déteériorer ja qua-
lité du son et empécher l’amplificateur de
donner son maximum.
® Les cables de haut-parleurs pour les deux
canaux devraient avoir approximativement
une méme longueur, car une différence re-
marquable pourrait résulter d’un équilibre
droite/gauche incorrect.
|
=
To Output Jacks (L, R)
an Ausgangsbuchsen (L, R)
Aux Prises de Sortie (Gauche, Droite)
° o.
Right-Channel Speaker
Rechter Lautsprecher
Haut-Parleur (Canal Droit)
@ To AC Wall Outlet or System Power Controi Strip (SPC-1)
© zum Netzanschiu8 oder System-NeizanschluBleiste (SPC-1)
@ Ala Prise de Courant Murale ou au Cordon
de Contréie de Puissance del’Appareil (SPC-1)
0D04893A
Left-Channel Speaker
Linker Lautsprecher
Haut Parleur (Canal Gauche)
Paae
0-880905A = Printed in Japan

Congratulations!
You have chosen a truly exceptional product.
All Nakamichi audio components are created according
to a simple but highly demanding philosophy: perfectly
natural reproduction of the musical experience, without
the
slightest
trace
of
coloration.
Even
the
ambience
of
ie stage and the heartbeat of the performers can be
felt
when
hearing
music
reproduced
the
Nakamichi
way.
This
is
what
has
earned
our
products
a
dedicated
Jollowing
among
discerning
audio
enthusiasts,
music
lovers and musicians the world over.
The
Nakamichi
power
amplifiers
PA-7IIIPA-SII
are
based
on
the
highly
esteemed
models
PA-7IPA-5.
All
aspects
of
these
very
successful
amplifiers,
such
as
component
parts,
circuit
design,
and
even
chassis
con-
struction
were
thoroughly
reevaluated,
with
the
aim
of
achieving
even
higher
overall
performance.
Through
these
efforts,
the
enormous
potential
of
the
revolution-
ary
STASIS
topology
has
been
brought
out
to
the
ful-
lest,
resulting
in.a
new
reference
for
sonic
excellency.
Great
care
was
taken
to
improve
the
“original”
perfor-
mance
characteristics
af
the
output
stage
and
STASIS
circuitry
before
any
feedback.
High
output
power
com-
bined
with
high
current
capability,
plus
the
STASIS
phi-
losophy
which
eliminates
the
need
for
global
feedback,
ensure
dramatically
improved
speaker
drive
capability
under
real-life
conditions.
All
parts
of the
amply
dimen-
sioned
power
supply
such
as
power
transformer,
filter
capacitors,
and
wiring
material
are
newly
developed
and
of
the
highest
quality.
Other
highlights
are the
so-
phisticated
voltage
amplification
stage
and
a
highly
rigid
chassis
built
with
full
mastery
of
latest
technology.
Dynamic
impact,
minimum
distortiin
and
extraordi-
narily
wide
frequency
range
are
immediately
apparent
when
auditioning
these
amplifier
masterpieces.
r
In order to take full advantage of this unit's superior
performance, please read this manual in its entirety
and retain it for future reference.
Thank you.
Nakamichi Corporation
The photo on this page shows the concert hall in the Nakamichi Re-
search Institute. Here every component must prove itself, above
and beyond technical specifications. This hall help us explore the
realm of live music, which is the starting and end point in the devel-
opment of all Nakamichi products.
English from page 4
Lieber Stereofreund!
Sie haben sich fiir ein in jeder Hinsicht hervorragendes
Gerdt entschieden. Alle Audio-Komponenten von Na-
kamichi folgen einem ebenso einfachen wie strikten
Motto: absolut natiirliche Musikwiedergabe, ohne
jeden Anflug von Verfarbungen. Musik horen mit Na-
kamichi ist ein- Erlebnis, das selbst die Raumdimension
und die elektrisierende Atmosphare auf der Biihne mit
einschlieBt. Nicht umsonst genieBt der Name Naka-
michi bei Musikfreunden, HiFi-Liebhabern und Musi-
kern auf der ganzen Welt einen so guten Ruf.
Die
Nakamichi-Endstufen
PA-7I1/PA-SII
sind
Weite-
rentwickungen
der
erfolgreichen
Modelle
PA-7IPA-5.
Sdmtliche
Aspekte,
von
Bauteilen
ber
den
S:
chaltung-
Saufbau
bis
hin
zum
Chassis
wurden
nochmals
von
Grund
auf
uberarbeitet,
mit
dem
Ziel,
die
bereits
her-
vorragende
Leistung
der
Vorgdngermodelle
auf
eine
noch
héhere
Ebene
zu
stellen.
Die
revolutiondre
STASIS-Technik
kommt
in
diesen
Stereo-Endstufen,
die
den
Begriff
der
Referenzqualitdt
neu
definieren,
zu
volliger
Entfaltung.
Ein
wichtiges
Ziel
war
die
Verzerrungsfreiheit
von
Aus-
gangsstufe
und
STAS!S-Schaltung
bereits
ohne
Gegen-
kopplung.
Hohe
Ausgangsleistung
und
hohe
Stromka-
pazitdt,
zusammen
mit
dem
STASIS-Konzept,
das
globale
Gegenkopplung
iiberfliissig
macht,
garantieren
absolut
prdziso
Lautsprecheransteurerung
im
tatsdchli-
chen
Einsatz,
selbst
unter
ungiinstigen
Bedingungen.
Als
Transformator,
Kondensatoren
und
Verdrahtungs-
material
des
kraftigen
Netzteils
kommen
nur
hochwer-
lige,
neuentwickelte
Komponenten
zur
Anwendung.
Die
technisch
ausgereifie
Spannungsverstirkerstufe
und
sin
verwindungsfreies
Chassis
neuester
Bauart
sind
weitere
Beispiele
fiir
den
hohen
Qualitdtsstand
dieser
Endstu-
fen.
Enorme
Dynamik,
geringste
Verzerrungen
und
breiter
U
bertragungsbereich
sind
klagliche
Vorziige,
die
auf
Anhieb
horbar
werden.
Um
die
vorziigliche
Leistung
dieses
Gerdéts
voll
zu
nutzen,
raten
wir
Ihnen,
die
Bedienungsanleitung
vor
Inbetriebnahme
genau
durchzulesen
und
fiir
Spateres
Nachschlagen
gut
aufzubewahren.
Vielen Dank.
Nakamichi Corporation
Das Foto auf dieser Seite zeigt die Konzerthaile im Nakamichi-
Forschungszentrum. Uber die rein technische Seite hinaus gewin-
nen wir dort wichtige Impulse fir unsere Arbeit Jedes Gerat muB
hier beweisen, was in ihm steckt, und live erlebte Musik steht am
Anfang und Ende aller Entwicklungsarbeit.
Deutsch von Seite 10
Francais voir page 15
Cher Client
Vous venez d’acquérir un produit réellement exception-
nel. Tous ies éléments des chaines Nakamichi sont
concus selon un principe simple mais des plus
exigeants, @ savoir: une reproduction parfaitement
naturelle, exempte de la moindre coloration. Quand
une musique est reproduite par Nakamichi, c’est toute
Vambiance du plateau que t’on ressent, jusqu’aux bat-
tements de coeur des musiciens. De nous étre tenus a
ce principe nous a valu des adeptes fidéles parmi les au-
diophiles, les mélomanes et les musiciens du monde
entier.
Les amplificateurs de puissance Nakamichi PA-7II/
PA-SIT sont basés sur les modéles trés appréciés PA-7/
PA-5.
Tous
les
aspects
de
ces
amplificateurs
trés
réussis, tels que piéces composantes, conception du cir-
cuit,
et
méme
la
construction
du
chassis,
ont
été
réé
values a fond, avec comme but d’obtenir une perfor-
mance
totale
supérieure.
A
travers
ces
efforts
le
poten-
tiel énorme de la topologie STASIS révolutionnaire a é
té développé au maximum, ceci résultant en une nou-
velle référence pour la perfection sonore.
Une grande attention a été portée 4 l’amélioration des
caractéristiques de performance “originale” de l’étage
de sortie et du circuit STASIS avant toute rétroaction.
La puissance de sortie élevée combinée @ la capacité
courante élevée, plus la philosophie STASIS qui permet
déliminer la nécessité de tétroaction globale, permettent
d’assurer dramatiquement l'amélioration de la capacité
de commande de haut-parleurs en conditions proches
de la réalité. Toutes les piéces de l’alimentation de
dimensions suffisantes telles que transformateur de
puissance, condensateurs de filtre et matériel de
cablage ont été développées récemment et sont de qua-
lité trés élevée. D'autres caractéristiques sont étage
d’amplification de tension sophistiquée et un chassis
tres rigide construit avec une trés grande maitrise de la
technologie la plus recente. Liimpact dynamique, une
distorsion minimum et une plage de fréquence tres é
tendue sont évidents au moment de l'emploi de ces
chefs-d'eeuvre d’amplificateur.
Afin de profiter pleinement des performances supe-
rieures de cet appareil, nous vous conseillons vivement
de lire d’abord ce‘mode d’emploi d’un bout a l'autre et
de le conserver pour pouvoir vous y référer plus tard.
Merci.
Nakamichi Corporation
La photo ci-dessus est une vue de la salle de concert qui se trouve
dans l'institut de recherches de Nakamichi. Cette salle sert 4 “me-
surer” les sensations qui, par définition méme, sont immensurables
et se situent au-dela des spécifications techniques. C’est dans ce -
royaume de la musique vivante que commence et qu’aboutit la
création de tous les produits Nakamichi.

English
CAUTION —
RISK OF ELECTRIC
SHOCK. DONDTOPEN!
CAUTION ————
TO REDUCE THE RISK OF
ELECTRIC SHOCK, DO NOT
REMOVE COVER (OR BACK). NO
USER-SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED
SERVICE PERSONNEL.
rN
The lightning flash with arrowhead sym-
bol, within an equilateral triangle, is in-
tended to alert the user of the presence of
uninsulated “dangerous voltage” within
the product’s enclosure; that may be of
sufficient magnitude to constitute a risk of
electric shock to persons.
The exclamation point within an equilater-
al triangle is intended to alert the user of
the presence of important operating and
maintenance (servicing) instructions, in
the literature accompanying the appli-
ance.
A
WARNING
TO PREVENT FIRE OR SHOCK
HAZARD, DO NOT EXPOSE
THIS APPLIANCE TO RAIN OR
MOISTURE.
This equipment generates and uses radio frequen-
cy energy and if not installed and used properly,
that is, in strict accordance with the manufactur-
er’s instructions, may cause interference to radio
and television reception. It has been type tested
and found to comply with the limits for a Class B
computing device in accordane with the specifica-
tions in Subpart J of Part 15 of FCC Rules, which
are designed to provide reasonable protection
against such interference in a residential installa-
tion. However, there is no guarantee that interfer-
ence will not occur in a particular instaliaton. If this
equipment does cause interference to radio or
television reception, which can be determined by
tuning the equipment off and on, the user is en-
couraged to try to correct the interference by one
or more of the following measures:
—reorient the receiving antenna
—relocate this equipment with respect to the
receiver
—move this equipment away from the receiver
—plug this equipment into a different outlet so that
equipment and receiver are on different branch
circuits.
if necessary, the user should consult the dealer or
an experienced radio/television technician for
additional suggestions. The user may find the fol-
jowing booklet prepared by the Federal Communi-
cations Commission helpful:
“How to Identify and Resolve Radio-TV Interfer-
ence Problems”.
This booklet is available from the U.S. Government
Printing Office, Washington, DC 20402, Stock No.
004-000-00345-4.
| Nekarioh high-fidelity equipment is sold in
more than 50 countries around the world. Many
of these countries have strict safety regulations
to which Nakamichi products must comply.
Models designated by an “A” have been pro-.
duced for North America (USA and Canada)
and comply with the requirements of Underwrit-
ers Laboratories (UL) and/or Canadian Stan-
Nakamichi Corporation Certifies That This
Equipment Conforms to DHHS Regulations No.
21 CFR, Chapter 1, Subchapter J.
Please record the Model Number and Serial
Number in the space provided below and retain
these numbers.
Model Number and Serial Number are located on
the rear panel of the unit.
Model Number: PA-711/PA-7AII/PA-7 Ell
PA-5i1/PA-5SAI/PA-SEll
Serial Number:
dards Association (CSA) as well as with other
applicable state/provincial and federal safety
standards.
Models designated: by an “E” have been pro-
duced for Europe and comply with the require-
ments of EEC Recommendation 82/499 as well
as with other appiicabie European safety stan-
dards.
Models without an “A” or “E” have been pro-
duced for countries other than North America,
Europe and Japan and comply with applicable
safety standards.
Nakamichi has authorized its local distributors
to offer warranties only on products which
have been produced in accordance with the
foregoing standards.
|

Safety Instructions
The following safety instructions have been includ-
ed in compliance with safety standard regulations.
Please read them carefully.
1.
Read instructions —All the safety and operating
instructions should be read before the appli-
ance is operated.
Retain instructions—The safety and operating
instructions should be retained for future refer-
ence.
Heed Warnings—Adhere to ail warnings on the
appliance and in the operating instructions. |
Follow Instructions —All operating and use in-
structions should be followed.
Water and Moisture—The appliance should not
be used near water—for example, near a bath-
tub, washbowl, kitchen sink, laundry tub, in a
wet basement, or near a swimming pool, etc.
Carts and Stands—The appliance should be
used only with a cart or stand that is recom-
mended by the manufacturer.
An appliance and cart combi-
nation should be moved with
care. Quick stops, excessive e
force, and uneven surfaces
may cause the appliance and
cart combination to overturn.
Wall or Ceiling Mounting—The appliance
should be mounted to a wall or ceiling only as
recommended by the manufacturer.
i
10
11.
12.
13.
Ventilation—The appliance should be situated
so that its location or position does not interfere
with its proper ventilation. For example, the ap-
pliance should not be situated on a bed, sofa,
rug or similar surface that may block the venti-
lation openings; or placed in a built-in installa-
tion, such as a bookcase or cabinet that may
impede the flow of air through the ventilation
openings.
. Heat—The appliance should be situated away
from heat sources such as radiators, heat regis-
ters, stoves, or other appliances (including
amplifiers) which produce heat.
Power Sources—The appliance should be con-
nected to a power supply only of the type de-
scribed in the operating instructions or as
marked on the appliance.
Grounding or Polarization—Precautions should
be taken so that the grounding or polarization
means of an appliance is not defeated.
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 appliance.
14.
15.
16.
17.
18.
Cleaning—The appliance should be cleaned
only as recommended by the manufacturer.
Nonuse Periods—The power cord of the appli-
ance should be unplugged from the outlet when
left unused for a long period of time.
Object and Liquid Entry—Care should be taken
so that objects do not fall and liquids are not
spilled into the enclosure through openings.
Damage Requiring Service—The appliance
should be serviced by qualified service person-
nel when:
A. The power-supply cord or the plug has been
damaged; or,
B. Objects have fallen, or liquid has been
spilled into the appliance; or,
C. The appliance has been exposed to rain; or,
D. The appliance does not appear to operate
normally or exhibits a marked change in per-
formance; or,
E. The appliance has been dropped, or the
enclosure damaged.
Servicing—The user should not attempt to ser-
vice the appliance beyond that described in the
operating instructions. All other servicing
should be referred to qualified service person-
nel.
Precautions
1.
q
a
As the heatsinks of this amplifier can become
quite warm during operation, sufficient clear-
ance is required above the unit to permit
smooth heat exchange. ;
Closely spaced stacking of components should
be avoided, as this impedes the air flow and can
also lead to mutual interference problems.
This unit is of considerable weight. Always
handle it with care during transport and install
it only on a sturdy, well-supported surface.
Caring for the exterior panels of the unit should
be limited to wiping with a soft, dry cloth. Avoid
using solvents or alcohol-based cleaners.
Voltage Selector (special equipment)
The voltage selector is provided only on the
model PA-7II/PA-5II sold in certain areas, not
on the models PA-7AII/PA-5All and PA-7EII/
PA-5EIl.
If the model you have purchased is the PA-7
II/PA-5il_ (with voltage selector on the rear
panel), be sure to check that the setting of the
selector matches the AC voltage used in your
area.
Voltage Selector

English
Controls and Features
eo
@®
Nakamichi PA-75
Powis Armkias
rd nee a 4 Left-Channel Speaker Terminals AC Power Cord
8
Hieates
pane
©
ne
sailed
‘
Depending
on
safety
regulations
in
the:
ower nnecior + . .
distribution area, the AC cord may be
@
Right-Channel
Speaker
Terminals
@
Heatsink
os
power
a
permanently fixed to the rear of the unit.
® Input Terminals (L, R)

Connections
®@
While
making
connections,
be
sure
to
set
the
power
switches
of
this
unit
and
all
other
components
to
“OFF.”
i Speaker Connections ;
Connect the left-side loudspeaker to the left-
channel
speaker
terminals
and
the
right-side
loud-
speaker
to
the
right-channel
speaker
terminals
of
this unit, taking care to observe correct (+) and
(—) polarity. If the polarity of one speaker is
reversed,
the
speakers
will
be
out
of
phase,
caus-
ing a loss in bass response and unstable, irregular
stereo imaging. Double-check to make sure that
both speakers have the same polarity.
@ Preamplifier (Control Amplifier)
Connections
Connect
the
Input
terminals
(L,
R)
of
this
unit
to
the
output jacks of the preamplifier, using shielde
cables with RCA-type plugs. :
©
\t
is
recommended
that
you
use
high-quality,
heavy-gauge
speaker
cable
with
low
resis-
tance,
designed
specially
for
audio
applica-
tions,
Using
thin
cable
with
high
resistance
may
impair
sound
quality
and
prevent
the
ampli-
fier
from
delivering
its
full
potential.
© The speaker cables for both channels should
be approximately equal in length, as a marked
difference can result in improper left/right bal-
ance.
;
@ Power Supply Connections
Confirm that this unit’s Power switch is set to “Off”.
Then insert the supplied power cord into the AC
Power connector on the rear panel of this unit and
plug the other end into an AC wall outlet.
When a Nakamichi control amplifier (such as the
CA-7/CA-5Il) is used, the optional System Power
Control strip (SPC-1) can be employed to supply
AC power to the PA-7II/PA-5il in conjunction with
the power switch of the control amplifier.
e After all system connections are completed,
first switch on the preamplifier (with volume
control turned fully to minimum), and then set
the Power switch of this unit to “On”.
Speaker Cable Connection Examples
Speaker Cable
Ye
Twist
exposed
ends,
a)
=
(-) Tighten securety.
Models With Fixed Power Cord
To meet the safety regulations in the distribution
area, the power cord of some models is permanent-
ly fixed to the rear of the unit. Therefore the power
supply connection can be established by simply
plugging the other end of the cord into an AC wall
outlet (or into the optional SPC-1, when using the
PA-7II/PA-5Il together with the CA-7/CA-5Il).
Canadian Model
The plug of this unit’s AC power cord is polarity
coded. The plug should be inserted into a wall
outlet so that the prong with the wide tip enters the
longer slot, which is the grounded side of the
outlet.
Preamplifier
—~
Right-Channel Speaker
Left-Channei Speaker
To AC Wali Outlet or Syste Power
Control strip (SPC-1}
CAUTION:
TO
PREVENT
ELECTRIC
SHOCK,
DO
NOT
USE
THIS
POLARIZED
AC
PLUG
WITH
AN
EXTENSION
CORD,
RECEPTACLE
OR
OTHER
OUTLET
UNLESS
THE
BLADES
CAN
BE
FULLY
INSERTED
TO
PREVENT BLADE EXPOSURE.

English
Protection Features
Protection Circuits
To guard against possible damage to the amplifier
and connected equipment, this unit incorporates
separate circuits for the left and right channel
which constantly monitor operating conditions. If
the internal temperature exceeds 75°C, if the unit
was driven to excessive levels or if DC current has
leaked into the output, relays cut off the output in
one or both channels. As the power supply is not
deactivated in this condition, the Power indicator
Fuse Protection
An AC line fuse socket is located on the rear panel
of this unit. If a short-circuit or the like occurs
inside the unit, this fuse will blow, causing the
Power indicator on the front panel to go oui. in
such a case, set the Power switch to “Off” and
unplug the power cord from the AC outlet.
Then replace the fuse with the supplied spare
fuse.
After replacing the fuse, check other components
and connector cables for possible problems. Then
switch on the power amplifier. If the fuse blows
again, contact an authorized service station.
remains lit. When regular conditions are restored,
the amplifier automatically reverts to normal opera-
tion.
The above mentioned cases may result from un-
suitable connections, improper installation (re-
stricted air flow prevents heat exchange), or abnor-
mal use (such as driving very low-impedance
speakers at high levels for an extended period).
Hf the protection circuits are activated frequently,
® This unit employs a fuse specially selected to
complement the high sound quality and perfor-
mance of the amplifier. Be sure to replace it
only with the supplied spare fuse. If a new fuse
is needed, purchase it from an authorized Naka-
michi service station.
first turn down the volume control of the preampli-
fier, then switch off the power to all components
and check connections. and installation conditions.
lf these checks reveal no particular problem, but
the protection circuit is activated again after the
amplifier was switched on, contact an authorized
service station.
Turn-QOn Protection
A so-called inrush current limiter circuit serves to
minimize the turn-on surge drawn from the power
line when the amplifier is switched on, thereby pro-
tecting the internal circuits as well as the house
circuit breaker.
The output of the unit remains muted for a short
period (approximately 5 seconds) after turn-on,
until all internal circuits have stabilize.
During the muting interval and when the pro-
tection circuitry has been activated, the red
LED (one for each channel) on the PCB
inside the amplifier lights up. In normal oper-
ation, the LEDs are out.
Troubleshooting
Condition Probable Cause Remedy
No. power. 1. Power cord not plugged properly into AC Power 1. Plug in. power cord firmly.
connector of this unit or AC wail outlet.
2. AC line fuse has blown. 2. Replace with supplied spare fuse or contact an
authorized service station.
No sound. 3. Faulty connections of RCA-type plugs and 3. Check connections.
shielded cables, or speaker cables.
Protection circuits are activated.
Preamplifer problem (improper connections or
operation).
os
4. Refer to paragraph “Protection Features”.
5, Refer to Owner’s Manual of preamplifier.
Left/Right channels reversed, no sound from one
channel.
6. Faulty connections of RCA-type plugs and
shielded cables, or speaker cables.
Balance control of preamplifier turned fully to one
side.
8. Protection circuit of one channel activated.
N
6. Check connections.
7. Adiust Balance control.
8. Refer to paragraph “Protection Features”.
Bass response deficient, unstable stereo imaging:
9. Speaker cable connected with reversed (+) (—)
polarity in one channel.
9. Connect speaker cable correctly.
Hum noise is heard.
10. Faulty or incomplete connection of RCA-type
plugs.
11. TV set operates in close proximity of amplifier.
10. Insert plugs firmly.
11. Increase the distance between TV set and
amplifier.
rr ht ens eyeprensy relished nt ee rn ae

Specifications
PA-7il
PA-5il
Continuous
Average
Power
Output
(NEW
IHF)
225W
x
2
(8
ohms,
both
channels
driven,
150W
x
2
(8
ohms,
both
channels
driven,
20—20,000
Hz,
0.05%
THD)
20—20,000
Hz,
0.05%
THD)
Dynamic
Power
per
Channel
340
W
(8
ohms)
225
W
(8
ohms)
Dynamic
Head
Room
(NEW
IHF)
1.7
dB
(8
ohms)
1.7
dB
(8
ohms)
Power
Bandwidth
(Half
Rated
Power,
0.05%
THD)
5
Hz—50
kHz
5
Hz—50
kHz
Damping
Factor
(NEW
IHF)
20
Hz/1
kKHz/20
kHz
Greater
than
60/
60/
60
Greater
than
60/
60/
60
Input
Sensitivity/;mpedance
(NEW
IHF)
2.0
V/
50
k
ohms
(rated
power)
1.6
V/
50
k
ohms
(rated
power)
i
140
mV/SO
k
ohms
(1
W
output)
140
mV/50
k
ohms
(1
W
output)
Frequency
Response
(1
W,
NEW
IHF)
20—20,000
Hz
+0,
—0.2
dB
20—20,000
Hz
+
0,
-0.2
dB
7—150,000
Hz
+0,
-3dB
7—150,000
Hz
+0,
—-3
dB
,
Signal-to-Noise
Ratio
‘(Input
Shorted,
Rated
Power,
IHF
A-WTD)
Better
than
120
dB
Better
than
120
dB
Residual
Noise
Level
(IHF
A-WTD)
Less
than
25
wV
Less
than
30
nV
Total
Harmonic
Distortion
(Rated
Power,
20—20,000
Hz)
Less
than
0.05
%
Less
than 0.05
%
Stereo
Separation
(Input
Shorted)
100
Hz/1
kH2z/10
kHz
120/105/90
dB
100/90/70
dB
Output
Complement
18
transistors
per
channel
12
transistors
per
channel
Output
Current
Capability
20
A
continuous,
90
A
peak
(per
channel)
18
A
continuous,
70
A
peak
(per
channel)
Power
Supply
700
VA
toroidal
transformer,
470
VA
toroidal
transformer,
132,000
uF
total
filter
capacitance
94,000
,F
total
filter
capacitance
Power
Source
120,
220,
240
or
110/120/220/240
V
AC;
50/60Hz
120,
220,
240
or
110/120/220/240
V
AC;
50/60Hz
(According
to
country
of
sale)
(According
to
country
of
sale)
Power
Consumption
900
W
max.
650
W
max.
Dimensions*
435(W)
x
200(H)
x
421
(D)mm
435(W)
x
157(H)
x
421(D)mm
:
17-1/8(W)
x
7-7/8(H)
x
16-9/16(D)
inches
17-1/8(W)
x
6-3/16(H)
x
16-9/16(D)
inches
Approximate
Weight
28.5
kg;
62
ibs.,
13
oz.
21.5
kg;
47
Ibs.,
6
oz.
%:Dimensions
do
not
include
protruding
parts.
Height
is
the
panei
height
without
feet.
©
Specifications
and
design
are
subject
to
change
for
further
improvement
without
notice.
©
STASIS
manufactured
under
license
from
Threshold
Corporation.
©
STASIS
is
a
trademark
of
Threshold
Corporation.

Nakamichi Corporation/Tokyo Office Shinjuku Daiichi Seimei Bldg., 2-7-1 Nishishinjuku, Shinjuku-ku, Tokyo 163 Phone: [phone] Telex: 2324721 (NAKAM J)
Nakamichi America Corporation 19701 South Vermont Ave., Torrance, CA 90502 . Phone: [phone]
Nakamichi Canada 276 South West, Marine Drive, Vancouver, B.C. V5X 2R4 Phone: [phone]
Nakamichi GmbH _ Praunheimer LandstraBe 32, 6000 Frankfurt Main 90 Phone: [phone] ~
Nakamichi Australia Unit 10, 21-29 Chester Street, Camperdown, N.S.W. 2050 Phone: [phone]
0D048768 0-891201G Printed in Japan