Denon PMA-925R User manual

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SERVICE
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PMA-925R/725R
INTEGRATED
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PMA-925R
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PMA-725R
CONTENTS
OPERATING
INSTRUCTIONS
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NIPPON
COLUMBIA
CO.
LTD.

CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION: TO REDUCE THE RISK OF ELECTRIC
SHOCK, DO NOT REMOVE COVER (OR BACK). NO
USER SERVICEABLE PARTS INSIDE. REFER SERVIC-
ING TO QUALIFIED SERVICE PERSONNEL.
The lightning flash with arrowhead symbol, within an equilateral triangle, is in-
tended to alert the user to 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 equilateral triangle is intended to alert the user
ta the presence of important operating and maintenance (servicing) instructions
in the literature accompanying the appliance.
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE
THIS APPLIANCE TO RAIN OR MOISTURE.
@ FOR U.S.A. & CANADA MODEL ONLY
CAUTION
TO PREVENT ELECTAIC SHOCK DO NOT USE THIS (PO-
LARIZED} PLUG WITH AN EXTENSION CORD, RECEPTACLE
OR OTHER OUTLET UNLESS THE BLADES CAN BE FULLY IN-
SERTED TO PREVENT BLADE EXPOSURE
@ POUR LE MODELE CANADIEN UNIQUEMENT
ATTENTION
POUR PREVENIR LES CHOCS ELECTRIQUES NE PAS UTILIS-
ER CETTE FICHE POLARISEE AVEC UN PROLONGATEUR
UNE PRISE DE COURANT OU UNE AUTRE SOATIE DE COU-
RANT, SAUF SI LES LAMES PEUVENT ETRE INSEREES A
FOND SANS EN LAISSER AUCUNE PARTIE A DECOUVERT.
DECLARATION OF CONFORMITY
We declare under our sole responsibilty that the product premain Amputier PMA-925R/ 725A 10 which this declaravon relates is in contormity with the follow:
ing standards
£N5S013, EN55020, ENG0555-2 and EM60555-3
UBEREINSTIMMUNGSERKLARUNG
Wir erklaren unter unserer Verantwortung, dag das Produkt Vor-Hauptverstarler PMA-925R/ 725R, aul das sich diese Erklarung bezeht, den folganden S:ac
daras eatspricnt
ENS$013, EN55020, ENG0555-2 und EN60555-3
DECLARATION DE CONFORMITE
Nous declarons sur notre seule responsabiliie que l'appareil Ampéf.catear PhIA-925R/725R auquel se raféra cette déclaration est conforme aux slanaascs
suivants:
EN55013, €N55020, ENG0555--2 et ENG0555-3.
DICHIARAZIONE DI CONFORMITA
Dichiariamo con piana responsahilita che it prodotto ampiiicatore di precedenza PMA-925R/725R, al quale questa dichiarazione si rifensce, @ conforme ale
seguenti normative:
€NS55013, EN58020, EN60555-~2 e ENG0555-3,
DECLARACION DE CONFORMIDAD
Declaramos bajo nuestra unica responsabilidad que e! producto precedente, el Amplificador PMA-925R/725R, al que esta declaracion hace referencia, es
conforma con los siguientes estandares:
EN55013, EN55020, EN60555-2 y EN60555-3
EENVORMIGHEIDS VERKLARING
Wit verklaren urlsluitend op onze verantwoordelikheid dat het produkt waarop deze verklaring betrekking heeft, de voorversterker PMA-925R/ 7258, in over-
Benstamming is met de volgende normen
ENS55013, EN55020, EN60555-2 en EN60555-3.
OVERENSSTAMMELSESINTYG
Harmed intygas hell pd eget ansvar att produkten, {érforstarkare / slutsteg PMA~925R /725R, vilken detta intyg hanvisar tit uppiylier féljande standarder
EN65013, EN55020, EN60555-2 och EN60555-3
DECLARAGAO DE CONFORMIDADE
Declaramos sob nossa exchisiva responsabitidade que o produto pre Aiiphicador Principal PMA-925R/725R ao qual esta declaragao corresponde, esta en”
contormidade com as sequintes normas:
END5O1G, EN9S020, ENGOSIS-2 @ ENGQ555-3
6A.
10
1
FOR U.S.A. MODEL ONLY
SAFETY INSTRUCTIONS
Read Instructions — All the safety and operating instruc- 12,
tions shouid be read before the appliance is operated.
Retain Instructions - The safety and operating instruc-
tions should be retained for future reference.
Heed Warnings - All warnings on the appliance and in the
operating instructions should be adhered to. 14
Follow Instructions - All operating and use instructions
should
be
followed.
15.
Water and Moisture - The appliance should not be used
near water - for example, near a bathtub, washbowi, 16
kitchen sink, laundry tub, in a wet basement, or near a
swimming pool, and the like
Carts and Stands - The appliance should be used only
with a cast of stand that is recommended by the
manufacturer.
An appliance and cart
combination should be
moved with care. a
Quick stops, exces- i, |
sive force, and uneven
surfaces may cause A \ 7
the appliance and cart Ta =
combination to overturn. —_
Wall or Ceiling Mounting - The appliance should be 18,
mounted to a wall of ceiling only as recommended by the
manufacturer
Ventilation - The appliance should be situated so that its 19.
location or position does not interfere with its proper ven-
tilation. For example, the appliance should not be si-
tuated on a bed, sofa, rug, or similar surface that may
block the ventilation openings; or, placed in a built-in
installation, such as a bookcase or cabinet that may im-
pede the flow of air through the ventilation openings
Heat - The appliance should be situated away from heat
sources such as radiators, heat registers, stoves, or other
apptiances {including amplifiers) that produce heat.
Power Sources - The appliance should be connected to
& power supply only of the type described in the operat-
ing instructions or as marked on the appliance.
Grounding or Polarization — Precautions should be taken
so that the grounding or polarization means of an ap-
pliance is not defeated
FIQURE A
EXAMPLE OF ANTENNA GROUNOING
‘AS PER NATIONAL
ELECTRICAL CODE
ANTTNE,
ceaam
wre
ANIENHS,
DISCHARGE UNI
WHEE SEC TRO 619-20:
Recta
SERY
EQUIP ENT GAQUNDING CO*
WHET SECTION 810-2
HES ~ HATONAL ELECTRICAL COOE
20.
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 recep-
tacles, and the point where they exit from the appliance.
Cleaning ~ The appliance should be cleaned only as rec-
ommended by the manufacturer.
Power Lines ~ An outdoor antenna should be located
away from power lines.
Outdoor Antenna Grounding ~ if an outside antenna is
connected to the receiver, be sure the antenna system
is grounded so as to provide some protection against
voltage surges and built-up static charges. Article 810 of
the National Electrical Code, ANS|/NFPA 70, provides in-
formation with regard to proper grounding of the mast
and supporting structure, grounding of the lead-in wire
to an antenna-discharge unit, size of grounding conduc-
tors, location of antenna-discharge unit, connection to
grounding electrodes, and requirements for the ground-
ing electrode. See Figure A.
Nonuse Periods ~ The power cord of the appliance 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 ob-
jects do not fall and liquids are not spilled into the encto-
sure through openings
Damage Requiring Service - The appliance shouid be
serviced by qualified service personnel when:
A The power-supply cord or the plug has been dam-
aged; or
8., Objects have fallen, or liquid has been spilled into the
appliance; or
Cc. The appliance has been exposed to rain; or
D. The appliance does not appear to operate normally or
exhibits a marked change in performance; or
€. The appliance has been dropped, or the enclosure
damaged.
Servicing - The user should not attempt to service the ap-
pliance beyond that described in the operating instruc-
tions. All other servicing should be referred to qualified
service personnel.
ge PERES TENS eT Raee el HSeZ/Hesee-vWc wee

NOTE:
}. Always keap the POWER switch on the main unit turned on.
2. Turn the power on and off from the ramoate contol unit
3, Unplug the power cord when you do not plan to use the unt for along period
of ume.
CAUTION:
tf only the MUTE/STANDBY LED is lit, this means that the power is
tuned off from the remote control unit. Turn the power on from the ra-
mote contro! unit
HINWEIS:
1. Lassen Sie den Netzschalter (POWER) am Hauptgerat stets eingeschaltet,
2. Schalten Sie den Strom mit dam Fernbedienungsgerat ain-und aus.
3. Trennen Sie das Netzkabet vom Netz ab, wenn Sie beabsichtigen, das Gerat
iiber einen langeren Zaitraum hinweg nicht zu benutzen.
VORSICHT:
Wenn nur das Stunimschalt-/Bereitschalts-LED (MUTE/STANDBY)
lauchtet, $0 bedeutet dies, dat der Strom vom Fernbedienungsgerat aus
ausgaschaltet worden ist. Schaltan Sie den Strom vom Fernbedienungs-
gerat aus ain
REMARQUE:
1. S‘assurer que le commutateur d’alimentation (POWER) sur l'unite principale
Sort toujours dans fa position activéee.
2. Allumer et ateindre l'apparerl avec {a télécommande.
3. Debrancherle cordon d'alimentation lorsque l'appareil ne sera pas utilisé pen-
dant une longue période
ATTENTION:
Si seul le temoin (LED} de sourdine/veile (MUTE /STANOBY} est allurna,
cela signitie que l'appareil est mis hors circuit parla tétécommande Alla
myer l'appareil avec la télecommanda.
NOTA:
1, Tenere sempre l'interruttore detla corrente POWER} detl’unita principale nella
posizione di attivazione.
Accendets e spegnete la corranta usando 4 telecomando.
2.
3. Scollegate il filo di alimentazione quando avete intenzione di non usare lappa:
fecchio per uA lingo periodo.
AVVERTENZE:
Se sono illuminati solo i LED di attenuazione/attesa (MUTE / STANDBY},
quasto significa che la corrente e” stata spenta con tt telecomando. Riac-
cendete la corrente usando 1! telecomando.
PRECAUTIONS FOR INSTALLATION
Leave at feast 10cm of space between this unit and any other component placed
above.
SICHERHEITSMASSNAHMEN BEIM EINBAU
Lassen einen Mindestabstand von 10 cm zwischen diesem Gerat und der ande-
ran Komponente, die darautgestellt wird.
PRECAUTIONS D'INSTALLATION
Prevoir un espace d’au moins 10cm entre l'unité et tout autre apparel se trouvact
au-dessus.
PRECAUZIONI PER LINSTALLAZIONE
Lasciate uno spazio libero di almeno 10 cm fra quest’ umita e qualsias: altro campe-
nente che & collocato sopra la siessa
NOTA:
+. Mantanga siempre activado el nterruptor da alimentacion (POWER) eri ia uns-
dad principal.
Encienda y apague el equipo desde la unidad de control remoto.
Cuando la unidad vaya a estar tuera de uso por un periodo pralongado de tiem-
po, desconecte el cable de alimentacién
PRECAUCION: P
Cuando sdlo el indicador LED de silenciamiento/modo de espera
(MUTE/STANDBY) esté encendido, significard que la alimentacidn a a
unidadha sido desconectada desde la unidad de control remoto. Conecte
ta almentacién desde la unidad de control remoto.
2
3.
OPMERKING:
1. Zorg er altijd voor dat de straomschakelaar (POWER) van het hoofdtoestel in
da ingaschakelde stand staat.
2. Schakel de stroom in en uit m b.v. de afstandsbediening.
3. Trek het netsnoer uit wanneer u denkt het toestal gedurende een lange perio-
de niet te gebruiken.
WAARSCHUWING:
Indien enkel de dampings-(MUTE}/ STANDBY LED brandt, betekent d.t
dat de spanning met de afstandsbediening is uitgaschakeid. Schakel de
spanning in met de afstandsbediening,
OBSERVERA:
1. Lat alitid strombrytaren (POWER) pa huvudenheten vara paslagen.
$a tll /fran strommen med hjalp av fjarrkontroilen.
Koppla toss natkabein om apparaten inte skati anvandas under ldag tia.
or
VARNING:
Om endast MUTE /STANOBY-tampan lyser betyder det att sttémmen,
har stingts av via fjarrkontrollen. Strommen maste da slas pa via f)3°-
kontrailen igen.
NOTA:
1. Mantenha o intesruptor da Corrente (POWER) na unidade principal sempre
ligado.
2. Ligue e desligue a corrente a parti da unidade de controlo remota.
3. Desconecte o fio de forca quando intentar nao utilizar a unidade po: lorgo
tempo. $
CAUTELA:
Se apenas se iluminar 0 LED de surdina/aspera (MUTE / STANDBY). 1s:0
signitica que a forga s@ desligoua partir do controle remota. Ligue a forca
2 partir do Controle ramoto
a:
1. EHR AYPOWER ( BiG ) WAL TLRS >
2. HIRES BEAR AER ZB A °
3 A RAST SER BF TY AS HB HH HR BRAK Fo
eR:
#7 FF MUTE/STANDBY LED{S MIE MRE
WRG a TEES BR APA] © H Ge Hde FE BE DL ALI
PRECAUCIONES PARA LA INSTALACION
Deje por lo menos 10 cm. de espacio entre esta unidad y cualquier otro compo-
nente situado sobre ella
VOORZORGSMAATREGELEN
Bij plaatsing dient u een ruimte van minstens 10 cm open te laten tussen ai toe-
stel an sen ander erop gepiaatst komponent.
FORSIKTIGHETSATGAROER VID INSTALLATIONEN.
Se till att det finns minst 10. cm melianrum mellan apparaten och en ev. annan ap-
parat som stalis ovanpa
CUIDADOS NA INSTALACAO
Deixe um espaco de pelo manos 10 cm entre esta unidade @ qualquer autre fom-
ponente colocado acima.
RATE
AAS b TERA GS A ED 10M >
wivales
aN ‘tr
30cm or more
10cm oder mehr
10cm ou plus
lcm o pil
1Oem 0 pis
10cm of meer
10cm eller mer
cm ou mais
VOM
Va
Avoid high temperatures.
Atiow for sulficient heat dispersion when
instaited on a rack.
Vermaiden Sie hohe Temperaturen
Beachten Sie, daB eine ausreichend Luftzirku-
lation gewanhrieistet witd, wenn das Gerat auf
ain Ragal gestelit wird.
Eviter des termpératures élevées,
Tenu compte d'une dispersion de cha'eur suft-
sante iors de t'instalation sur une étagere
Evutate di asporre Cunild a temperature alte
Assicuratevi che Ci Sia un acteguata dispe'sio-
ne del calare quando installate {va 1a nun ro:
bile per Componenti Budo.
Evite altas tamperaturas
Parmite la Suticiente dispersion dei ctor cusn-
do esta instalado en la consola
Vermyd noge temperaturen.
Zorg voor een degalk nitteafvoer noien het
apparaat op een ek wordt geplaalst
Urduik hogs temperaturer
Se tl att det Linas mo,yher tl god varnea-
viednng v.d momtering + ett rack
Evite 1emperaturas atlas
Conceda suficiente dispersdo de calor quando
© equipamente for instalado numa prateleia.
Handle the power co’d carefully.
Hold the plug when unplugging the cord.
Genen Sie vorsichtig mit dem Netzkabdei um.
Halten Sie das Kaba! am Stecke:. wenn Sie den
Stacker herausz ehen
Manipuler la cordon d'alimentation avec pre-
caution
Tens ta prse lors du débranchement du cor-
don
Manneggiate 1! {ito di aumantazione con cura.
Agite per la spina quando scollegate # cavo dal
a presa.
Maneje el cordon da energia con cuidedo
Sostenga el enchule cuando desconecte él
cardéa de energa.
Hanteer nat netsnoer voorz:cntig
Ho. het snaer bij de stekker vast wanneer de-
ze moet worden aan- of losgehoppald.
Hantera nathabein varsami
Hall) kavein nar den kopplas [ran ei~uttagel
Manusee com cundado o fic cond.tor de ener-
93
Sagu’e a tomas ao desconectar o ho.
Keep the set free from moisture, water, and
dust
Halian Sie das Gerat von Feuchtigkeit, Wasser
und Staub fern.
Proiager l'appare! conte Vhumidité, |‘eau et la
poussiére.
Tenate funita lontana dal'umidita, dall’acqua @
dalla poivere
Mantenga el equipo bre de humadad, agua y
poivo
Laat geen vochtigneia. water of siof in het ap-
paraat b:nnend‘ingen
Utsatt inte apparaten far fukt, vatten och
damm.
Mantenha o apavelho wvra de qualquer umida-
Ge, aqua ou poera
SE |
Unplug ine power cord when not using the set
for long periods of te
Wenn das Gerat ene langere Zeit nich} ver-
wendel werden so'l, Irennen Sie das Netzka-
bel vom Netzstacke’
Oebrancher le cordon d’almentation lorsque
lappareit n'est 938 utlise pendant de longues
périodes
Cisinnastate ut filo di alimentazione quando
avete lintenzione di non usare il filo di alimen-
tazione per un lungo perodo Gi tempo.
Desconecte el cordén de energia cuando no
utilice el aquipe por Mucho tiempo.
Neem altijd net nets-oer uit het stopkontakt
wanneer het apparaat gedurende een lange
periode net wordt gedruikt.
Koppia ur natkabein om apparaten inte kom
mer all anvdngas 1 f3ng 1d.
Desiigua 0 fio condstor de forga quando 0 api
relno ndo wer que Se usado por um longo pe
iodo,
‘(For sets with vent lation holes)
Do not opsizuct the vertuation holes.
Die Beluftungsoffaunge durfen nicht ver-
deckt werden
Ne pas obstruer les trois d'aération.
Non coprite i for d. venti szione.
No obstruya los ori! cians de ventilacién.
De ventistieoperngen mogen niet worden
pebiokkeerd.
Tapp inte wll vant: aronsoppringarna.
Nao opsirua os o°.ficics cle ventilagao.
NOTE ON USE /HINWEISE ZUM GEBRAUCH / OBSERVATIONS RELATIVES A UUTILISATION
NOTE SULL'USO/NOTAS SOBRE EL USO / ALVORENS TE GEBRUIKEN / OBSERVERA
OBSERVACOES QUANTO AO USO
Do not lat foreign objects in the set.
Keine (ramden Gegenstande in das Gerat
kommen lassen.
Ne pas laisser des objets strangers dans I'ap-
pareil
E* importante che nessun aggetto & insento
alt'interno dall‘unita.
No deje objetos extranos dentro del equipo.
Laat geen vreemde voorwerpan in git apparaal
vallen.
Se till att frammande foremal inte tanger in 1
apparaten.
Nao daixe objetos esiranhos no aparelho,
Do not tet insecticides, benzena, and thinner
come in contact with the set
Lassen Sie das Gerdt nicht mit Insektiziaen,
Banzin oder Verdiinnungsmuteln in Berishrung
kommen
Ne pas mettre en contact des insecticides, du
benzene et un diluent avec \'appareil,
Assicuratewi che I'unita non venga in contatto
con insetticidi, benzoio o solvanti
No permita el contacto de insecticidas, gasoli-
na y diluyentes con el equipo.
Laat geen insektenverdelgende middelan,
banzine of verfverdunner mat dit apparaat in
kontakt komen:
So till att inte insektsmedei pa spraybruk, ben
sen och thinner kommer i kontakt med appara-
tens holje.
Néo parmita que inseticidas, benzina @ disso
vente anteem am contacto com 0 aparetho.
> a8
$ ,
Never disassemble or modily tha set in any
way.
Versuchen Sie niemals das Gerat auseinander
zu nehmen oder auf jegliche Ant zu verandern
Ne jamais damonter ou modifier (appared
d'une maniére ou d'une autre.
Non smontate mai, n@ modihicate Funita +
nessun modo.
Nunca desarme 0 modifique el equipo de nin-
guna manera.
Noort dit apparaat damonteran of op andere
wijze modifieran,
Ta inte iss apparaten och forsok inte bygga ory
den
Nunca desmonts ou modilique o aparalno ae
alguma forma.
BS SSS L/S SS Nk aaa ea a a a ET

FRONT PANEL
FRONTPLATTE
PANNEAU AVANT
PANNELLO ANTERIORE
nea:
REAR PANEL
RUCKWAND
PANNEAU ARRIERE
PANNELLO POSTERIORE
3B
@ CARTRIDGE |® GND
@® PHONO
U.S.A, CANADA, TAIWAN A.0.C. Model
Modell fir USA, KANADA, TAIWAN R.O.C
Modale pour U.S.A., CANADA, TAIWAN R.0.C
Modello per i Stati Uniti, | CANADA @ TAIWAN
Kibet = i GAC MRO. Be
@ for U.K.)
© Modell fiir Europa, Asian & Hong Kang
fauBer GroBbritannian).
Europe, Asia & Hong Kong model (except
® Modéle pour Europe, Asie et Hongkong
(sauf Royaume-Uni)
© —Modbalio per I’Europa, I'Asia @ Hong Kang
{all’infuori dai Regno Unitot.
@® CD. TUNER,
AUX
© BRAN SR AR REG (DRS) Fig. 4
Abb. 1
it
@ SPEAKERS
@ DAT/TAPE-1, DAT/TAPE~2
TAPE PB @ TAPE REC
Selector Switch
Canndge GND
Phona Input Terninais
(Pronot
tnput Tererinals
(CO, TUNER. AUXI
Playback and Recording Terminats
© Playback Tereninals
® Recording Torminals
Speaker Terminals
solenane cartuccia
| each _{ am Es
Phono
1
Tonapnehmer- GND lipiattenspieler- Eingangsbuchsen Tonband-Ein /Ausgange Lautspracher—
Wahtschaiter Eingargsbuchsen (CO. TUNER, AUX) © Wiedergabe klemmen
‘ (Prone © Autnahme
Solecteur de GND Rores deetse Bornes a Bornes de leciure e1 d'enregistrement Bornes de naut-
coliute (pharat iCD. TUNER, © Bornes de lecture parieurs
© Bornas denragistrement
Intetruttore i GND Termmnah a irgresso Terminal sh fiproduzione registrazione Yerminaki
© Terminal ch npraduzione
© Terminal ot registrazione
Wha Aga, fF
SHAS
AK
SOS. MEME | LES
ee Ane
- AGE MS.
degli altopariant:
BE OE BE am F
6
CONNECTIONS
ANSCHLUSSE
CONNEXIONS
CONNESSIONI
Record Player itor MC. MMi
Plattenspiele: itie MC. MAS!
Tourne—D'sque ipour MC, MM)
Giradischi (pes MC. MMj
SF SR PR he ait
Speaker System (A)
Boxenpaar (A)
Systeme de Haut-Parieurs (Ai
Sistema di altoparlanti (A)
MHRA)
Speaker System iB}
Bdxenpaar 18)
Systeme de Haut-Parteurs (8)
Sistema di altoparianti (8)
$8 33 KKB)
BEAK =
reareeuneney
a
: Ground Wue L
S— Erdungstabel
> F4 de Masse
Filo di massa
. waa
Sennateceners,
CO Player outputs
CO-Spister a
Lecteur CD { Q Gi p>
Lenore CO wn
CDS
j—LINE IN
Tuner (REC)
Tuner
Tuner TPUT:
Sistoniezatoro ours LINE
aan
gad
/OUT
caE@
Pi
= ee Power Cord
a
Netzkabel
° Cordon d’alimentation
AA AA a di alimentazione
Video
Dock
ISouna
Outl
Bs
tape
Deck
2
Videorekorder (Audio-Ausgarg
Cassetten Deck 2
Magnétoscope ‘Sortie son! Auoio (2)(0) (2)(0) Mapdcoteee é
Videoregistratore (uscita su0! a! Mao }
BERR
AM)
oureuts
eure.
ig
ee?
[eer O|
See)
Tape Deck 1 LINE IN
Casseiten Deck 3 (REC)
Magnétophone 1 WAG
Piast a cassette 1
OE 7
Fig. 2
end Abb, 2
(fe 0 | m2
SPEAKER TERMINAL LEFT SPEAKER
LAUTSPRECHEASUCHSEN LINKER LAUTSPRECHER
BORNES OF HAUT-PAR.EURS MAUT-PARLEUR GAUCHE
TEAMINALE DEGLI ALTOPARLANT: = ALTOPAHLANTE SINISTRO.
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2
1 BOARS ‘ a wos
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Fig.
3
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Aa Eee SSS LHSSe vil EER

DESIGNATIONS AND FUNCTIONS OF PANEL CONTROLS
0
NN}
POWER (Power Switch)
When the power switch is turned ON ( -= ), the MUTE/STAND-
BY LED @ lights.
When the power switch is turned ON, power is supplied to the
unit. It takes a few seconds after the power is turned on for the
unit to warm up. This is due to the built-in muting circuit that
eliminates noise during the on/off operation. -
PHONES (Headphone Jack)
This jack is used to plug in the headphones.
SPEAKERS (Speaker Selection Switch)
The PMA-925R/725R can be connected to two speaker sys-
tems: speaker system A and speaker system B.
When A is pressed, the speaker system connected to speaker
output terminals A operates,
When B is pressed, the speaker system connected to speaker
output terminais B operates.
When A and B are pressed on together, bath speaker systems
operate simultaneously, When the A and B switches are both off
tin the out position}, there is no output from the speaker termi-
nals. This setting is used to listen to playback through the head-
phones.
LOUDNESS (Loudness Switch)
When the volume is low, itis difficult for the human ear to clearly
distinguish notes in the low and high frequency ranges. The loud-
ness switch allows a simple “one-touch” correction of this diffi-
culty. Press the loudness switch ON ( -«. ) when listening to mu-
sit at a low volume. The low notes and high notes will be
corrected to produce a natural sound.
BALANCE (Balance Control)
This knob is used to adjust the balance between the left and right
channels. When it is set to the center position, the amplitude of
the amplifier is equal on both sides. It there is a difference in the
feft and right channel output voltages for a cartridge, move the
knob to the left and the right to adjustit. If the volume on the right
side is too low, turn the knob to the right ( “¥ ). If the volume on
the left side is too low, turn the knob to the left ( # ). This wilt
achieve an even balance on the left and right sides.
VOLUME (Volume Control)
This knob controls the overall volume level.
Turn the knob to the night ( “¥ } to raise the volume and to the
lett (#7 ) to lower it.
BASS (Bass Control)
This knob is used to control the bass quality of the sound.
\When the knob is set at the center position, the frequency char-
acteristics are flattened in the range below 1000 Hz. The bass
is emphasized as the knob is moved off center to the right ( WwW,
and reduced as it 1s moved to the left (# )
When volume contro! @ is set to the right of the center position,
the effect of the other controls 1s reduced:
TREBLE (Treble Control}
This knob ts used to control the treble quality of the sound
When the knob is set at the center position, the frequency char-
acteristics are flattened in the range above 1000 Hz. The treble
is emphasized as the knob is moved off center to the right ( ¥ },
and reduced as it is moved to the teft (¥ }
When volume control @ is set to the right of the center position,
the effect of the other controis is reduced
SOURCE DIRECT (Source Direct Switch)
The controls (BALANCE, LOUONESS, and TONE) can be used
when this switch is in the OFF (IL ) position.
When set to the ON (=. } position, the above controls are by-
passed and the signals are input directly to the volume control
cifcuit, providing high quality sound.
REC OUT SELECTOR (Rec Out Select Switch)
Use this switch to select the recording component.
@ PHONO: Used to recording from the turntable.
e CD: Used to recording from the CD player.
@ TUNER: Used to recording from the tuner
@ AUX: Used to recording component that con-
nected to the AUX terminal.
® DAT/TAPE-1 p> 2: Used to recording from the tape deck
connected to the OAT/TAPE-—1 jacks
@ DAT/TAPE-2 } 1: Used to recording from the tape deck
connected to the DAT/TAPE-2 jacks.
REMOTE SENSOR (Remote Control Sensor)
This sensor receives the infra-red light transmitted from the
wireless remote control unit.
For remote control, point the wireless remote control unit to-
wards the sensor.
MUTE / STANDBY LED
This LEO flashes while the muting circuit is activated when the
power is turned on and when muting is turned on from the re-
mote control unit, and remains sit (without flashing) whiie the
power is on.
INPUT SELECTOR (Input Select Switch)
Use these to select the program source.
When the button for the desired program source is selected, its
LED lights. One program source only can be selected at a time,
as follows:
@ PHONO: Used to select the output from a turstable
that is connected to the PHONO terminal.
Use the PHONO switch @ (Rear Panel Side)
to switch the sensitivity to corraspond to the
cartridge type being used.
e co: Used to listen a compact disc player or other
component that is connected to the CD ter-
minal.
@ TUNER: Used to play a component such as an
FM/AM tuner or a TV tuner that is connected
to the TUNER terminal
@ AUX: Used to play a component such as a Hi F: vid-
0 piayer, TV tuner, 8-track tape player or
tape deck that is connected to the AUX termi.
nal.
@ DAT/TAPE-1: Use this Position when using the tape deck,
etc., connected to the DAT/TAPE-1 jacks.
@ DAT/TAPE-2: Use this Position when using the tape aeck,
etc., connected to the DAT/TAPE-2 jacks.
® PHONO (Cartridge Selection Switch): Rear Panel
Side
This switch is set according to the type of player cartridge to be
used,
@ MC (-® |; Used when an MC {moving-coil) cartridge with
an output of jess than 0.5 mV is used
@ =MM {= ): Used when an MM (moving-magnet) cartridge
with an output of 2 mV or more is used.
® AC OUTLETS: Rear Panel! Side
@ For U.S.A., Canada, and Taiwan R.O.C. madels.
AC outlets ara used for connecting amplifier component
units, such as tuner, turntable, tape deck, etc.
e@ SWITCHED (Total capacity: 120 WI:
These outlets are turned ON/OFF when main power
switch and POWER button on the Remote Control Unit
is turned on/off
@ UNSWITCHED (Capacity: 240 W)
This outlet is always ON whether power switch is on or
OFF
e@ For Europe (except the U.K.), Asia and Hong Kong mod-
els.
AC outlets are used for connecting amplifier component
units, Such as tuner, turntable, tape deck, ete.
@ SWITCHED {Total capacity: 100 W):
These outlets are turned ON/OFF when main power
switch and POWER button on the Remote Control Unit
is turned on/off.
®@ UNSWITCHED (Capacity: 100 WI
This outlet is always ON whether power switch is on or
OFF
OPERATION
PREPARATION
1. CHECKING CONNECTIONS
® Make sure that all the connections are proper by referring to the
back panel. (Fig. 2, 3)
@ Check the polarity (positive and negative) of connections, and
the directivity of stereo separation (right cord to right channel ter-
minat, and left cord to left channel terminal).
@ Check the directivity of pin cord connection.
2. SETTING OF EACH KNOB
@ Turn the volume control knob counterclockwise, to "0"
@ Set the rotary knob to “flat”.
@ Set SOURCE DIRECT and LOUDNESS to “OFF { -@.}".
Atter checking the above items, turn on the power, the amplifie: is set
in the ready mode in a few seconds.
PLAYING A RECORD
1. Set the INPUT SELECTOR switch to “PHONO”.
2. Operate the turntable and play the record.
3. Turn the volume and tone controls to yield an appropriate volume
and sound quality.
PLAYBACK OF CD PLAYER
1. Set the (NPUT SELECTOR switch to “CD”.
2. Operate the CD player.
3. Turn the volume and tone controls to yield an appropriate volume
and sound quality.
RECEPTION OF RADIO PROGRAMS
1. Set the INPUT SELECTOR switch to “TUNER”.
2. Operate the tuner to receive a radio program.
3. Turn the volume and tone controls to yield an appropriate volume
and sound quality.
CONNECTIONS OF AUDIO EQUIPMENT TO AUX TERMINALS
1, Set the INPUT SELECTOR switch to “AUX” Position,
2. Operate the Audio equipment Systems.
3. Turn the volume and tone controls to yield an appropriate volume
and sound quahty.
PLAYBACK WITH TAPE DECK
1. Set the INPUT SELECTOR switch to “DAT/TAPE-1" or
“DAT/TAPE-2",
2. Operate the Tape Deck.
3. Turn the volume and tone controis to yield an appropriate volume.
and sound quality.
RECORDING WITH TAPE DECK
1. Setthe REC OUT SELECTOR to the program source you wish to re-
cord.
2. Start the playback of the program source.
3. Start recording with the component connected to “DAT/TAPE-1" or
“DAT/TAPE-2".
@ in the PMA-925R/725R, the REC OUT signal and the speaker
(headphone) signal are output via separate circuits so that knobs and
switches retated to the tone and volume have no effect whatsoever
on the sound that is recorded. Also, since the recording function is
selected by the REC OUT SELECTOR, the free program source can
be played through the speakers (or headphones) even during re-
cording.
® MONITORING THE RECORDING
A recording in progress can be monitored if a tape deck with three
individual heads for recording and playback is used. A tape deck in
which a common head is used for both recording and playback can-
not be used to monitor recording. When a recording is being made
using DAT/TAPE-1, selecting DAT/TAPE-1 with the INPUT SELEC-
TOR will engage tha RECORDING MONITOR and pemit a check of
the recording condition,
CAUTION
Protective Circuit
This satis equipped with a high speed protective circuit. This cir-
cuit protects the internal circuitry from damage due to large cur-
rents flowing when the speaker jacks are not completely con-
nected or when an output is generated by a short circuit. This
protective circuit's operation cuts off the output to the speak-
ers. In such a case, be sure to turn the power to the set off and
check the connections to the speakers. Then turn the power on
again. After muting for several seconds, the set will operate nor-
mally.
NOTE
@ This amplifier has a full memory back-up system. When the power
is turned on, INPUT SELECTOR @ are set to the last mode set be-
fore the power was turned off
14
eh Nid ra ae a na

REMOTE CONTROL OPERATION
The accessory Remote Control Unit 1s used to control the amplifier from a convenient distance.
(1) Inserting the Dry Celt Batteries Notes on Battery Usage
1, Remove the battery cover on the Remote Control Unit. @ RC-176 uses the size REP (AA) dry cell batteries.
®@ The batteries will need to be replaced approximately once a year.
This will depend upon how often the Remote Control Unit is used.
© If, inJess than a year from the time new batteries were inserted, the
Remote Control Unit fails to operate the Amplifier from a near-by
Position, it is time to replace the batteries.
© Insert the batteries properly, following the polarity diagram inside
the battery compartment.
@ Batteries are prone to damage and leakage. Therefore:
@ Do not mix new batteries with used ones.
2. Insert two dry cell batteries as shown in the diagram on the bat- @ Do not mix different types of batteries
tery supply unit ®@ Co not jumper opposite poles of the batteries, expose then to
heat, break them open, nor expose them to open fire.
© Ifthe batteries have leaked, remove any traces of battery flurd from
the battery compartment wiping thoroughly with a dry cloth. Then
insert new batteries
(2) Directions for use ® Operate the Remote Control Unit while pointing it towards the Re-
mote Control Sensor on the Amplifier as shown in the diagram on
the left.
© The Remote Controi Unit can be used at distances up to about 8 me-
ters in a straight line from the amplifier. This distance will decrease
if there are obstructions blocking the infra-red light transmission or
if the Remote Control Unit is not directed straight at the amplifier
Note on operation
© Oo not press the operating buttons on the Amptifier and the Remote Control Unit at the same time. This will cause misoperation,
© Operation of the Remote Control Unit will become less effective or erratic if the infrared Remote Control Sensor on the Amplifier is exposed to
strong light or if there are obstructions between the Remote Controi Unit and the sensor.
@ Incase you operate a VCA, TV or other components by remote conto!, do not operate buttons on two different remote control units at the same
time. This wilt cause misoperation.
Besides
being
able
to
operate
the
PMA-925R/725R
amplifier
with
this
Remote
Control
Unit,
you
can
also
operate
a
DENON
cassette
deck
and
CD
player
from
this
handy
full~system
Remote
Control
Unit.
Remote control section
Full-system Remote Control Unit
The
full-system
Ramote
Contro!
Unit
operates
atl
major
functions
of
the
Amplifier,
such
as
function
switching,
volume
control.
But
that’s
not
all!
The
same
controt
pad
can
also
contro!
the
major
functions
of
a
DENON
CD
player
and
cassette
deck
and
tuner
when
combined
with
the
PMA-925R
/725R
to
create
a
remarkably
ergonomic
and
versatiie
DENON
system
with
all
the
quality
sound
reproduction
that
the
devoted
audiophile
expects.
+
12
Remote Control Unit RC-176 supplied with the PMA-925R/725R
© (POWER) sutton
This button can be used to turn on and off the power of the ampli-
fier.
However, the power for the amplifier turned on and off if itis in
the power standby mode and the power cord is plugged in
Bic get cy har This button will not function if there is a power failure, if
CoO mal a the power cord is not plugged in, or when using an aud.o
KEW FED PLAY timer,
@ = MUTING button
ee Lol
SI It - ¥ Pressing this switch will activate the muting condition and no
Seca Signals will be output to the speakers.
Tare JaPEy aux
Other buttons
Other buttons are exclusively for the PMA-925R/725R. and
function in the same way as the corresponding buttons on the
set.
£0 POND
DENON
REMONE CONTRO, UNIT ACITE
» PLAY PLAY button
<q PLAY (REY) PLAY (REV) button
@ stop STOP button
dq REW REWIND button
FF >> FF button
Reter to the operating
instructions of your
it PAUSE DENON tape deck
&/B W-DECK A/B DECK
SELECT burton
D> PLAY PLAY button
@ STOP STOP button
Revere ieee PRESET ¢ buttons
ere
ue
Press
this
button
to
move
up
or
down
among
the
preset
Forward Track Station numbers.
Search button
Refer to the
operating
instructions
‘of your DENON
CO player
PAUSE button
RANDON
DISC SKIP
WW PAUSE
®
The
RC-176
Remote
Control
Unit
can
control
CD
players
and
cassette
decks
manufactured
by
DENON
Note
that operation
may
not be
possible
for
some
modeis
*
Buttons
are
conveniently
separated
into
groups,
each
group
Controlling
one
specific
component.
The
groups
are
AMP,
FUNCTION,
CD
,
DECK
and
TUNER
etc
«
For
details
on
operating
other
components.
refer
to
the
operating
instructions
for
the
CD
player
and/or
cassette
deck
CAUTION:
@
If
the
power
is
turned
off
with
the
Remote
Controt
Unit,
the
set
is
switched
to
the
power
stand-by
state.
tf
you
are
absent
for
a
long
period
of
time,
unpiug
the
power
cord.
© Only the MUTE/STANDBY LED @ lights when in the power stand-by mode.
@
You
may
experience
erratic
operation
of
the
Remote
Control
Unit
if
it
is
operated
in
fluorescent
light
and
diract
suniight,
in
particular
if
this
light
strikes
the
Remote
Control
Sensor
on
the
Amplifier.
However,
this
is
nota
malfunction,
and
if
this
should
happen,
simply
protect
the
sensor
against
such
light.
13
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Technica! Data
(typical vaiue}
T Technische Daten
Itypische werte)
Caractéristiques techniques
(valeur caractéristique)
* POWER AMPLIFIER SECTION
Aated Output Power:
"Both channel driven
(8 Q/otm Load)
20 Hz to 20 kHz, TH.0.0.02%/0.05%
{482/ohm Load}
DIN, 1 kHz, THO. 0.7%
*2Continuous 8OW/GSW
per channel min into 8 Q/ohms,
frony 20 Hz to 20 KHz with
no more than 0 02%/0.05%
tolal harmonic distonion
Total Harmonic Distortion:
(-2 4B at rated output,
8 Q/ohms)
© PRE AMPLIFIER SECTION
Rated Output:
tRecout Terminal}
Input Sensitlvity/
Input Impedance:
PHONO:
CD, TUNER AUX
TAPE-I, TAPE-2:
RIAA Oeviation;
PHONO
Within £03 dB
Maximum Input:
@ OVERALL CHARACTERISTICS
SN Ratio (IHF A Network):
haput terminals shorteweuted
SOURCE -DIRECT ON
‘Tone Control Adjustable
Range:
BASS
TREBLE
Loudness;
© OTHERS
Power Supply
AC Outlets
Switched x 2
Unswitched 1
Power Consumption
Dimensions x {W} x (H) x [DI
Net Weight
REMOTE CONTROL UNIT
(RC-176)
Ramote control system:
Infrared pulse systany
Power supply:
3V DC, Two size REP IAA"?
dry catl batteries
External dimensions:
Waight:
Note: °1 For Europe, Asia and Hong Kong Hinwei
*2 For U.S.A, Canada, and Tanvan 8.0.C
© LEISTUNGSENDS VERSTARKER
Nenn-Ausgangsleistung:
"Beda Kandle betroevem
tan 8 Q/Onm}
20 Hz brs 20 KH2,TH.D 0,02%4,08%
(an 4. Q/Onm)
DIN, 1 kHz, TH.D. 0.7%
*2Fonlaufend BOW/ESW
pro Kanal min zu 8 Q/Ohm von
20 He bos 20 kH2 mit emem
Gasamitklurfaktor van nicht
mane als 0,02%/0,05%.
Gesamtkilerfaktor:
1-3 dB be: Nennausgang,
89/0hm)
VORVERSTARKER
Nenn-Ausgangsieistung:
(Auinanme-Ausgangsbuchse)
Eingangsemplindlichkeit/
Eingangsimpedanz;
PHONO.
CO, TUNER, AUX
TAPE-1, TAPE-2
Innachaib + 0,3 dB
Manximaler Eingang:
GESAMTEIGENSCHAFTEN
Signal/Reuschabstand
{IHF-A-Weiche|
(Engange kurzgascniossen)
SOURCE DIRECT ON
Klangregelberelch:
TIEFEN {6ASS)
HOHEN (TREBLE)
Gehorrichtige Lautstarke:
SONSTIGES
Netzspannung und- trequenz
Wechselstrom-Ausgange
Gescha'tet x 2
Ungeschaltet x |
Leistungsaufnahme
Abmessungen (B) « {H] = {T)
Nettogewicht
FERNBEDIENUNGSGERAT
(RC-176)
Fernbedienungs-System:
intrarot-impulse
Stromversorgung:
3V Glaichstrom, wai Trockenzelle-
Batier:an vom format REP (AAS
AuRere Abmessungen:
Gewicht:
1
°
°
°
PARTIE AMPLIFICATEUR
DEPUISSANCE
Puissance nominale;
*'Entramement deux canaux
(charge 8 Q/ohms}
20 Hz & 20 Hz, DHT 0,02%/0,05%
(charge 4 2 /ohms}
DIN, 1 kHz, D.H.T. 0.7%
*280W/B5W en continu par
canal sur min. 8 Q/ohms de
20 Hz & 20 kHe avec une
distorsion harmonique totale
de 0,02%/0,05% ou mains.
Distorsion harmonique tot
(-3 dB & la sortie nominaie,
8 Q/onms)
PRE-AMPLI
Puissance nominale:
{Borne de sonie d’enregistrement?
CD, TUNER, AUX
TAPE-1, TAPE-2:
Variation RIAA:
PHONO:
Int 8 £0,3 6B
Entrée max.:
CARACTERISTIQUES GENERALES
Rapport signai/brult
te ju IHF A):
‘Bornes d’antrée court-circuitées)
SOURCE DIRECT: ON
Gamme de réglage de tonalite:
GRAVES
AIGUS
Compensation phystologique:
AUTRES
Alimentation
Prisas secteur (AC)
Commutées x 2
Non commutées x I:
Consommation
Dimensions (L} x (H} x {0}
Poids
UNITE DE TELECOMMANDE
(RC~176)
Systome de télécommande:
Systéme & impuision infrarouge
Allmantation:
3V CC, deux piles saches
de format REP ("AA")
Di slons extérieures:
Poids:
* Speciications and contents ara subject to change without notice for purposes of imp:ovament
© Anderungen des Inhalts und der technisenen Daten zum Zwecke der Verbessarung vorsehalten.
© Spac:hcations et contanu sont suats a od-teation sans préavis
PMA-825R /725R
BOW + BOW/E5W + BSW
13OW + 130W/100W + 100W
BOW/ESW
0,007%
150 my
MM 2.5 mv/47 kQ/kcohm
MC 200 pV/100 Q/onm
150 mV/47 kQ /kohm
20 Hz ~ 20 kHz
PHONO.
MM 160 mv/1 kHz
MC 12mv/1 kHz
PHONO:
MM: 94 d8
lat 5 mV input
MC: 76 d@
fat 06 mV input
CO, TUNER, AUX
TAPE~1, TAPE-2: 107 dB
100 Hz +8 dB
10 kHz £8 dB
300 H2 +7 dB
10 kHz +6 dB
AC230V/50 Hz
(For Europe, Asia and Hang Kong modais)
AC120V/60 Hz
(For U.S.A., Canada, and Taiwan A.0.C.
models) £
100W (Totalt (For Europe (except the U.K.),
Asia and Hong Kong models}
120W (Total) (For U.S.A, Canada, and
Taiwan A.O C. models)
1OOW iFor Europe (except tne U.K), Asia
and Hong Kong models)
240W (For U.S.A., Canada, and Taiwan
R.0.C. models}
230W/2 10W IEC)
4.2A/3.6A (U.S.A. and Canada models)
434(W) x 162(H} x 346(D}mm PMA-925R
(17-3/32" x 6-3/8" x 13-5/8")
434(W) x 142(H} x 346(Dimm PMA-725R
117-3/82" x 6-19/32" x 13-578")
11 kg (24 Ios 402) / 9.6 kg (21 lbs 302)
S5(W} x 194(H} x 18{0}mm
2-11/84" x 7-41/64" x 45/64")
100 g {about 3.5 oz}
fancluding batteries)
1 Fur Europa, Asien und Hong Kong Note: *? Pour Europe, Asie et Hong
Hong
°2 Fue USA, Kanada, und Tawan A.O.C. *2 Pour U S.A, Canada, et Taiwan R.0.C.
47.
Please check to make sure the following items are included with
the main unit in the carton:
{1} Operating Instructions BRS AN: ay ake BAT to
(2) Remote Control Unit (RC-176) ies te ee eee |
(3) Batteries R6P (AA) ..... os re
DEUTSCH
Bitte Gberprifen Sie, ob die folgenden Teile vollstandig in der Ver-
packung enthalten sind:
(1) Bedienungsanienung us qi ate : 1
(2) Fernbedienung (RC-176) ..... Seon hrs ere
{3} Batterien vom Typ R6P (AA) whats odds daa Ra 2
jez controler que les articles suivants sont bien joints a l'ap-
pareil principal dans le carton:
(UY Mode G'OMplol ii. ses coe dees 8d dead deep es 1
{2} Unite de telécommande {RC-176) face
(3) Piles R6P (AA) sahil etme acieia Sateen sa shake 2
Controllare che te part! seguenti si trovino imballate con iapparec-
chio nella scatola di spediziione.
(1) Libretto deite istruzion: i
{2) Telecomando (RC~176) Stree 1
(3) Batterie R6P {AA} : 2
MEMO:
ESPANOL
Por favor verifique asegurandose de que {fos siguientes articulos
son empacados en la caja pero separados de la unidad principal.
(1) Manual de instvucciones .............. Saas i
(2) Unidad de control remoto (RC-176) ................. 4
(3) Pitas RGP (AA}..... 2... ere 2
NEDERLANDS
Kontroleer of de volgende accessoires bij het hoofdtoestel in de
doos zijn verpakt:
(1) Gebruiksaanwijzing ....... Seas Hate Mia etek xs i)
(2) Afstandsbediening {AC-176) ............ en 1
(3) Batterijen REP (AA) .......
SVENSKA
Kontroilera att féljande, férutom huvudapperaten, finns medi kar-
tongen.
{1} Bruksanvisning .
{2) Fydrrkontroli (RC-176) .
{3) Batterier R6P (AA) ..
PORTUGUES
Certifique-se de que as seguintes pegas esto incluidas na emba-
lagem fora da unidade principal:
(1) Instrugées de operagao Pahestd
(2) Unidade de controle remoto (AC-176} ...
(3) Baterias R6P (AA)
KS GAAS M— DAMS MNES
chy HEME
(2) ELE REIRC-176)
G3) RWRLROPCVAD ....
51
ie ee ee ee eee

f= PMA-3S25R/725R
REMOVAL OF EACH SECTION
Top Cover
@ Top Cover
1) Remove 4 screws (A) and 3 screws F
2) Pull up Top Cover in arrow direction.
e@ Front Panel
1) Remove 3 screws :
2) Remove 6 screws
3) Detach Front Panel in arrow direction.
e@ Main Chassis
1) Remove 2 screws :
2) Remove 2 screws securing Power Radiator with
Main Chassis.
3) Remove 4 screws @ securing Rear Panel with
Main Chassis.

e Inner Panel
1)
2)
Remove 5 Knobs and 4 nuts.
Remove 2 screws (H) and detach Inner Panel
in arrow direction.
e Each Unit of Inner Panel
1
~~
2)
3)
Remove 3 screws oO , and detach LED and
Switch Unit.
Remove 2 screws G@) , and detach u-Com Unit.
Remove 2 screws (kK) securing Headphone, SP
Switch Unit with Inner Panel.
Remove 1 screw () and 1 washer, and detach
Headphone, SP. switch Unit.
Remove 2 screws (M) and a Knob, then detach
Power Switch Unit.
Inner Panel
LED and Switch Unit
” u-Com Unit
PMA-925R/725R
Headphone. Speer
and Switch Unit

BE PMA.S2 SAF 2S Re a a a a Te ETT,
FUNCTION OF NEW CIRCUIT
1. CHARACTERISTIC OF THIS CIRCUIT
The junction temperature of power amplifier output transistor always varies by an ambient temperature and music signal.
Occurrence
of
junction
temperature
varying
causes
in
change
of
bias
current,
unstable
function,
thus
pure
music
signal
playback is unable to do.
To maintain fixed bias current and to make pure music signal playback possible is the purpose of this circuit. This circuit
holds stable bias current condition within a few seconds after turning on the power.
2. BLOCK DIAGRAM OF BIAS CONTROL CIRCUIT FUNCTION
As explained in Fig. 1, detects a voltage across the emitter resistors (RE) of TR1, TR2. Converts the detected voltage and
comparing with the reference voltage to make the bias current value in stable state. Actually, these functions are performed
by 1 chip IC.
. oo 1 Chip IC
TR1, TR2: Output transistor
RE : Emitter resistor
Fig. 1
3. POWER SUPPLY FOR ACTUATING CONTROL CIRCUIT
TR - [ 5, > ToIC (V*) The circuit (IC) controlling bias current actuates by
Power supply circuit floating.
RE Output Accordingly, the power supply is also needed to be
floated.
In this circuit, as indicated in Fig. 2, output is common
TRe
to
provide
+,
—
power
system
and
supplies
to
IC.
Fig. 2
10

4. IC DESCRIPTION (uPC5023CS-064)
Contents
PMA-925R/725R wl
Contents
rw [~~
Control signal stabilizer input
Control signal stabilizer output
Comparator output
Peak hold input
[OO
Comparator input (~)
Peak hoid output
(2)
z
Comparator input (+)
GND _ | Floating common
Controller gain setting
esc
Control signal output
Comparator input (+)
Comparator input (-)
Reference voltage
Comparator gain setting
O;/O IN |
Comparator output
+ Power supply
fo)
5. CIRCUIT IN THE CONCRETE
POWER SUPPLY
4
BIAS CONTROLLERR
Comparator output
— Power supply
ANSISTOR
RESISTOR
11

Gg PMA-9S25F/725R
METHOD OF ADJUSTMENTS
DC Voitmeter
1U-2938
Main Unit
POWER
TP
CN302
TRANSFORMER
Or
a
A
é
POWER
TRANSFORMER
VR202 VR201 VR204 VR203
Balance Main Volume Bass Treble
IDLING CURRENT
e@ Setup
1.
Lay
the
unit
at
an
ordinary
position
away
from
a
direct
current
from
a
cooler
or
fan.
Do
the
adjustment
at
a
temperature
between
15°C
(59°F)
and
30°C
(86°F).
2.
Set
controls
as
follows.
POWER
SWITCH->
OFF
(a)
VOLUME
CONTROL-
fully
counterclockwise.
((’)
min.
(Main
Volume
VR201)
(VR202,
203
and
204
are
center
position.)
SPEAKER
Terminals—
open:
do
not
connect
the
speakers,
dummy
load
etc.
@ Confim
1.
Remove
Top
cover.
And
then
connect
DC
Voltmeter
to
Test
points
of
Main
Unit.
-
2. Connect Power cord to AC Outlet, and tum POWER Switch "on" (==) .
3. 10 seconds after check to see DC Voltmeter reading is 7 + 2mvV.
4. 2 minutes after re-check DC Voltmeter for 7 + 2mV reading.
12

PMA-925F/725R
aaa
BLOCK
AND
LEVEL
DIAGRAM
OSt-
aPpert-
OFL-
(indu
Awg"o
ye)
aP9z
Porl-
aps’ezi-
(Qndu:
Aws
je)
aPr6
(NO:LO3uIC
JoOUNOS)
@PZ01
(@PS'91-)
AOS,
sr
098
GO
(aPz'Z2/A8'z2)
wYyoR/msgo
(QPL
82/AE"Sz)
wYoR/M0g
Ov
(AGP)
ag
Sn
3WNIOA
O
@-3dVL
NIVW_/
(GSANGNO})
O
sects
ond
Q
SNOHd
dVSH
O—o
Lo
GYAN
VadS
O—0
_o
el
&
aa
—
V-YSNVadS
O—0
0
(
eas
dWV
Y3MOd
NOL
¥ansng
O
on)
o
aay)
84
§)
Oo
xnV
'
we
—O
YANNL
1
4
boaaaa==------
iiaiaiaiaisiateieteeiehiaaaieee
—o
ao
Loauid
YOLOa13$
ee
7.
30”NOS
INdNI
6
OWN)
&
LE
(OW/WW)
ee
O
ONOHd
13

Gl PMA-9S25R/725R
SEMICONDUCTORS
e IC’s
uPC5023CS-064 (IC401,402)
Contents
Name Contents
_{2ZDi__| Control signal stabiliser input
ZDO_| Control signal stabiliser output
Comparator output
PH-| | Peak hold input
Comparator input (-)
14 PHO_ | Peak hold output
Comparator input (+)
EG |
Floating common
15 EAEO | Controller gain setting
16 EACO | Control signal output
Comparator input (+)
a |
17 EA+! | Reference voltage
Comparator input (-)
——+
18 EA-1 | Comparator gain setting
Comparator output
19 EAO | Comparator output
+ Power supply
D10 [1 | [42] D9
teob11
[2
|
141]
D8
MUTE/STANDBY
LED
Indication
revwore
[o]
or
2
[ren
|
o
[ue
F
|
3
|
tavmrz
|
0
|
PowerConmol
(REMOTE
PowerONOFF)
Ti
Vdisp/RA1
[4
|
[39]
06
|
4
|
vdepmar
|
1
|
reo
sy
Gs
Ps
[aw
[0
|
Roi
(6
|
D4
|_s
|
ror
|
©
|
sasing Contr!
Power
ON-OFF.
Function
Shiting.
MUTING)
Li
R02
[36]
03
|.
7
|r
|
o
[spacomi
C™—“*‘“*™*sé*dCSC=SCSd
ros
[8
|
Tas]
02
| 8 jroo |_|
SPB
Conor
H
R10
|
34]
D
;
_
L9
|
"
[at
|
0
|
Keyscan
strobe
=
R11
[70]
[33]
Do
[a2
|
[ow
|
ar2
[11]
vec
pris
|
R13 [12] [31] osc2
Reo
[13]
130}
OSc1
Key
scan
receive
rai [14] [29] Test
R22
[15
| |
28]
RESET
[Fo
-
R23
[16
|
AVSS
—
owe
>
INTO/R32 fr Breakdown detect input
R30
RA3/AN3
|
INTIS
|
Reméte
control
signal
decoding
input
Rat
[18
RA2/AN2
[eno
|
INTO/R32
[24]
R41/AN1
[Aves
|
INTi/R33 [20] | 23] R40/ANO
ano (27 | [22] avec
< oo
NOP
Discrimination post by user's genre
fe) & i
f
:
z ¢
4
z
eller Fill Oscillator 4MHz; External
Colles Fill Oscillator 4MHz; Extemal
20 V- — Power supply
HD404304A13P Terminal Function
| 1 [oo jo | K
TAPE-2 Control
TAPE-1 Control
AUX Control
TUNER Control
Mutually reset;
f= felelel ele lel ele lel ele ee Ee PEE EEE EE EEE EEE
eres
14
CD Control
PHONO Control

M51954A
(IC803) Veet]
N.C.(2]
GND/3]
5 cafacty
ouT{s]
— sal
Faial
(3) (4)
GND DELAY
CAPACITY
NJM7806FA(S) (IC702)
LB1639 (IC802)
oe 1. Vec
a 2. Output
3. GND OO
TU + Case Fin st ANDARD
toe 5. Case Fin
3 § TRANSMITTER
BA4558 (1C201, 901)
NJM2068DDC (IC202)
4 1. AOUTPUT
2. A-INPUT
1 3. AHINPUT
4.V-
5. BHINPUT
6. B-INPUT
7.B OUTPUT
8. V+
(TOP VIEW)
TLP521-1(BL)
INFRARED LED + PHOTO TRANSISTOR
(IC403, 404)
1: Anode
ose 2: Cathode
4 3: Emitter
2
: 1
4: Collector
@ IC PROTECTOR
so
voutz
ICP-15
(IC701)
—\aP-
(N-Type)
: CX20106A Chip
: PIN Photo Diode Chip
: SL Characteristic +5%
: Gain Adjuster
: fo Adjuster +1% USE
145%
: Aluminum Electrolytic Capacitor
@ TRANSISTORS
2SA970 (BL), (BL/GR) 2SA1145 (OV(Y)
2SA988 (E/F) 2SC2705 (OV(Y)
2SC1841 (E/F)
2SC1815 (BL)
PMA-925R/725R wa
2SA1491 (O/P/Y)/(Z) PMA-925R
2SC3855 (O/P/Y)(Z) PMA-925R
2SB1560 (O/P/Y) PMA-725R
2SD2390 (O/P/Y) PMA-725R
2SC2240 (BL/GR)
B
(Base)
B
(Base)
E
(Emitter)
C
(Collector)
C
(Collector)
C
(Collector)
E
(Emitter)
E
(Emitter)
B
(Base)
2SA1038S
(S/E)
DTA114ES
2SA9335 (S)
2SC2389S (S/E)
2SSC1740S (S) ie
B (Base)
C (Collector)
. E (Emitter)
2SB1566 (E/F)
B (Base)
@ DIODES (including LED)
1SS$252 MTZJ3.9A MTZJ36A
MTZJ7.5A MTZJ16A
MTZJ 18A
Navy Blue Navy Blue
SLR56-VR (Red) Thyristor
SLR56-DU (Orange) SFOR1A42 (SC601)
A
x
4
Cathode
as
ape C (Cathode)
A (Anode)
G (Gate)
B
B (Base)
C (Collector)
E (Emitter)
2SD2395 (E/F) 2SB1328 (P) 2SK369 (BL)/((GR)-C
S (Source)
E (Emitter) E (Emitter) G (Gate)
C (Collector) C(Collector) D (Drain)
B (Base)
S4VB20F (D702) PMA-725R
4D4B42 (D702) PMA-925R
1SR35-200A
Blue
15

BEE PMA-S25AR/7 25 PF ea ae ae ae a ee ae eT Ne ee OO aE a a a RR PET
PRINTED WIRING BOARD (Pattern Side)
1U-2938C MAIN UNIT ASS’Y FOR PMA-925R
Cacumenen
_eserernmcace
eS
woe
8
AA
commana
i
oN
16

Ta
nL
7
OR
LS
LRT
NY
EP
a
TE
(a
TE
TE
RE
EE
PV
ASP
SR/7
252
Sc
1U-2938 MAIN UNIT ASS’Y FOR PMA-725R
1U-2938A EUROPE Model
1U-2938B U.K. Model
+
‘
‘
j pe
17

gal PMA-925R/725R
1U-2939A y-COM. UNIT ASS’Y
A -1_ | p-Com. Unit
-2 | LED Unit
| -3 [Phono unit |
1U-2939-4
B z=
C
D aut
GND.
T
Ox
TUNE
cD
PHON
@&
RI
e
RST
E L
18

2
1U-2940 VOLUME UNIT ASS’Y
1U-2940A :
1U-2940B :
1U-2940C :
1U-2940 Volume Unit Ass’y
1 | Volume Unit
Speaker Unit
PMA-725R EUROPE Model
PMA-725R U.K. Model
PMA-925R
-3 | AC Outlet Unit
Speaker Sel. Unit
3% PMA-925R :FI T2.5A
1U-2940-3
19

Gl
PMA-925RF/725R
Caen
nn
a
NS
aT
SSS
PARTS LIST OF P.W.B. UNIT ASS’Y
1U-2938C MAIN UNIT ASS’Y (PMA-925R)
[Ret.Ne. | PartNo. | PartName | Remake]
20
NOTE FOR PARTS LIST
@
Part
indicated
with
the
mark"
©
"
are
not
always
in
stock
and
possibly
to
take
a
long
period
of
time
for
supplying,
or
in
some
case
supplying
of
part may
be refused.
@ When ordering of part, clearly indicate "1" and "I" (i) to avoid mis-supplying.
@ Ordering part without stating its part number can not be supplied.
@ Part indicated with the mark "x" is not illustrated in the exploded view.
@
Not
including
Carbon
Film
+5%,
1/4W
Type
in
the
P.W.Board
parts
list.
(Refer
to
the
Schematic
Diagram
for
those
parts.)
WARNING:
Parts marked with this symbol Z\ have critical characteristics.
Use ONLY replacement parts recommended by the manufacturer.
e Resistors e Capacitors
Ex:
RN
14K
2E
182
G
FR
Ex:
CE
O04W
1H
2R20
06M
BP
Type Shape Power Resist- Allowable Others Type Shape Dielectric Capacity Allowable Others
and
per-
ance
error
and
per-
strength
error
|
formance
|
|
formance
|
J
5
|
:
Carbon
‘
:
Pulse-resistant
type
:
Aluminum
foil
i
: :
High
stability
type
:
Composition
s :
Low
noise
type
electrolytic
:
Metal
oxide
film
:
:
Non-burning
type
:
Aluminum
solid
:
Non-polar
type
:
Winding
:
. :
Fuse-resistor
electrolytic
:
Metal
film
:
‘
:
Lead
wire
forming
:
Tantalum
electrolytic
:
:
Ripple-resistant
type
:
Metal
mixture
:
Film
:
" :
For
charge
and
discharge
:
Ceramic
:
7
:
For
assuring
high
frequency
:
Ceramic
z
:
:
UL
part
*
Resistance
:
Oil
:
:
CSA
part
18
2
=
1800
ohm
=
1.8
kohm
i
Mica
:
;
UL-CSA
type
_
t____
Indicates
number
of
zeros
after
effective
number.
:
Metallized
:
Lead
wire
forming
: Metallized
2-digit effective number.
* Units: ohm
1 R 2 = 1.20hm
UT 1-digit effective number.
fi OR 2-digit effective number, decimal point indicated by R. * Capacity (electrolyte only)
e
Units:
222
=>
2200uF
Units:
ohn
T___._Indicates
number
of
zeros
after
effective
number.
2-digit
effective
number.
°
Units:
uF.
2R 2 => 2.2uF
[ L___ 1-digit effective number.
2-digit effective number, decimal point indicated by R.
* Units: LF.
* Capacity (except electrolyte)
222 => 2200pF = 0.0022nF
| More than 2)— Indicates number of zeros after effective number.
2-digit effective number.
¢ Units: pF.
221 => 220pF
| Lo or 1) Indicates number of zeros after effective number.
2-digit effective number.
* Units: pF.
* When the dielectric strength is indicated in AC, *AC" is included after the dieelectric
strength value.
SEMICONDUCTORS GROUP
1¢201 263 0322 004 | IC BA4558
1C202 263 0609 002 | IC NJM2068DDC
Linear ope. amp
1C401,402 | 2630930 001 | IC uPC5023CS-064
10403,404 | 262 0874 009 | IC TLP521-1(BL)
10701 268 0073 905 | IC ICP-N15 IC protector
TR301~304] 271 0094 919 | Transistor 2SA970(BL)
TR305,306 | 271 0131 924 | Transistor 2SA988(E/F)
TR307~312| 273 0235 923 | Transistor 26C1841(E/F)
1R313,314 | 273 0303 910 | Transistor 26C17408(S)
TR315,316 | 275 0069 001 | Transistor 2SK215
1R317,318 | 275 0068 002 | Transistor 25/78
TR323. ‘| 271 0131 924 | Transistor 254988(E/F)
TR401,402 | 271 0280 901 | Transistor 25A1038S(S/E)
TR403,404 | 273 0281 906 | Transistor 25C2705(0)/(Y)
TR405,406 | 273 0432 904 | Transistor 25C2389S(S/E)
TR407,408 | 271 0168 900 | Transistor 2541145(0)/(Y)
TR601,602 | 273 0235 923 | Transistor 2501841 (E/F)
TR603~605} 273 0303 910 | Transistor 2SC1740S(S)
TR606 271 0192 905 | Transistor 2SA933S(S)
TR607 273 0235 923 | Transistor 25C1841(E/F)
TR608 271 0094 935 | Transistor 2SA970(BL/GR)
TR609 272 0107 906 | Transistor 2SB1328(P)
TR610~612} 273 0235 923 | Transistor 2SC1841(E/F)
TR615 273 0303 910 | Transistor 25C1740S(S)
TR616 272 0107 906 | Transistor 2SB1328(P)
TR701 274 0168 006 | Transistor 25D2395(E/F)
TR702 272 0129 007 | Transistor 2SB1566(E/F)
TR703 | 271 0280901 | Transistor 25A1038S(S/E)
TR704,705 | 273 0432 904 | Transistor 2502389S(S/E)
TR706
273
0303
910
|
Transistor
25C1740S(S)
TR801~806| 273 0235 923 | Transistor 26C1841(E/F)
D101~106 | 276 0616 907 | Diode 1SS252
D301~306 | 276 0616 907 | Diode 18S252
D351,352 | 276 0616 907 | Diode 1SS252
D401~414 | 276 0616 907 | Diode 1SS252
D601,602 | 2760616 907 | Diode 1SS252
D701
276
0553
905
|
Diode
1SR35-200A
[Ref-No | Pate. | Perens]
D703,704 | 276 0553 905
ZD401~404 | 276 0643 954
276 0644 911
ZD701,702 | 276 0645 978
276 0644 911
ZD705,706 | 276 0645 907
Diode 1SRQ5-200A
Zener diode MTZJ3.9A
Zener diode MTZJ7.5A
Zener diode MTZJ36A
Zener diode MTZJ7.5A
Zener diode MTZJ18A
Thyristor SFOR1A42
| _ Remarks |