Yamaha M-4 Owner's manual

Yamaha M-4 Owner's manual
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Thank you very much for purchasing the YAMAHA Stereo Power Amplifier M-4.
Developed by applying the best of YAMAHA’s superior electronic technology, the
M-4 is a DC stereo power amplifier that achieves an extremely high level of perform-
ance,
The output stage, which uses pure complementary OCL and parallel push-pull circuitry,
produces the rated output of 120W + 120W (General and European model) without any
strain on the large-capacity power supply section.
Before first operating your M-4, please read this Owner's Manual carefully, in order
to fully realize the potential of the unit and to keep it in best condition for many
years of trouble-free use.
FEATURES
® The voltage amplifying stage employs a cass ® Two extremely large 15,000 uF capacitors,
cade-connected differential two-stage circuit two separate constant-voltage power supplies
FEATURES .......... ivi.
CAUTION; READ THIS BEFORE
OPERATING YOUR M-4 ..............
CONNECTION DIAGRAM ..............
CONNECTION AND OPERATION .........
FRONT PANEL AND CONTROLS .........
SPECIFICATIONS ........... cc.
BLOCK DIAGRAM ............ a
CHARACTERISTICS DIAGRAM ..........
SCHEMATIC DIAGRAM ............ ....10
TROUBLESHOOTING. ......... eee 6 11
throughout.
The use of a Dual FET input and a new cas-
cade bootstrap circuit in the first stage and
a cascade-connection, current mirror and push-
pull output in the pre-drive stage ensures a
high degree of stability, low distortion and
improved high-frequency characteristics.
In the driver and the power amplifier a three-
stage emitter follower is paralleled with pure
complementary OCL SEPP circuitry using
high-fT transistors. This accounts for wide
bandwidth, high output and low distortion.
for the voltage amplifying stage, and the use
of a pure copper plate earth line for ultra-
low impedance guarantee greatly reduced inter-
modulation distortion, improved separation
and absolutely stable operation.
Other Features
Except for the chemical capacitors in the
power supply section, mylar and styrol capac-
itors are employed throughout.
Layout of parts, wiring, earth line as well as
many other aspects have been given due con-
sideration.
The basic design ensures high reliability, while
the ultimate aim has been the improvement
of the overall audio characteristics.
Special Instructions for British-Standard Model
IMPORTANT |
THE WIRES IN THE MAINS LEAD ARE COLOUR-
ED IN ACCORDANCE WITH THE FOLLOWING
CODE:
BLUE: NEUTRAL
BROWN: LIVE
As the colours of the wires in the mains lead of this
apparatus may not correspond with the coloured mark-
ings identifying the terminals in your plug, proceed as
follows, The wire which is coloured BLUE must be
connected to the terminal which is marked with the
letter N or coloured BLACK. The wire which is colour-
ed BROWN must be connected to the terminal which
is marked with the letter L or coloured RED.
ma
PLACE OF INSTALLATION
Do not use the set in
e locations exposed to direct sunshine,
such as near windows
—e locations of high temperatures, such as
near heaters |
e locations of extremely low temperatures
humid or dusty locations
e Since the M-4 is quite heavy 18.5 kg
it should be placed on firm base.
WATER DAMAGE
If by accident the set has come into
contact with water, immediately discon-
nect the power plug and contact your
YAMAHA service store. Be careful not to
place any container that holds liquid near
the amplifier.
PROPER VENTILATION
Never cover the ventilation holes on top
of the amplifier with any object. If proper
ventilation is not ensured, the internal
temperature of the set will rise unduly,
which will cause improper operation and
lead to damage.
CAREFUL HANDLING
Avoid using strong force when operating
any of the switches and controls.
UNAUTHORIZED OPENING
Never open the case of the amplifier or
touch any of the parts inside, as there is
serious danger of electric shock. |
If, by accident, some foreign matter has
been dropped inside the set, immediately
disconnect the power plug and contact
your YAMAHA service store.
ADDITIONAL AC POWER
RECEPTACLE (GENERAL
EXPORT MODELS ONLY)
The additional AC power receptacle on
the rear pane! of the set is UNSWITCHED
(not linked with the power switch}. and
has a maximum capacity of 100W. Before
connecting another piece of equipment
to this outlet, check its power consump-
tion to ensure it does not exceed this
limit.
MOVING THE SET
Before moving the amplifier, be sure to
disconnect the power plug as well as all
other connection cords.
POWER CORD
When disconnecting the power cord, al-
ways hold the plug itself and do not pull
the cord.
When the set is not to be used for a long
period of time, it is recommended to
disconnect the power cord.
CAUTION : READ THIS BEFORE OPERATING YOUR M-4
PLAYING RECORDS
Be sure to turn down the volume on the
control amplifier before lifting or lowering
the tone arm when playing records. Other-
wise the transient ncise may cause damage
to the speakers.
MAKING CONNECTIONS
Always switch off the power before con-
necting or disconnecting the input cables.
CLEANING
Avoid wiping the case with liquids such
as benzine or thinner, and do not use
insecticide sprays or the like near the set.
Always use a soft, dry cloth to wipe the
set.
BEFORE REQUESTING SERVICE
Before calling in a service technician, please
check the TROUBLESHOOTING chart in
the last section of this manual to be sure
there is no misoperation.
~ OWNER’S MANUAL
Please keep this Owner's Manual for fu-
ture reference.
CONNECTION DIAGRAM
LEFT
Speakers
te
TET
= р
e—i| 12e
В a
= we ша киа к на о и жим o
ra
pany 2 am
a NEU E sw fc
= “2 À
PIN CORD
Control Amplifier
= Ld
YAMAHA 5s
110 150 220 220 VEL TS ol
TTS 50 601 E
МИРОМ CARE! CO LTO
ALAN" Si. MARA
GO
т бо en © Te " om > “26 Cu
THE OR
9 es00 | (sels e |
Paola
E
os
au
SPEAKERS
aÑARN 1 "6 SPEÁXER — Ay E 6 CPEAWER
NS SERIES
M-4
A Hz
NIPPON ¡GAKKI Cd, LTD.
HAMAMETSU JAPAÑ
Ground cord
SPEAKER CORD
Y o
: SELCTOR MAINS
3)
Dv
Y
ЗМ
2) К
©
General Model
RIGHT
Speakers
PRON La oo. LT
«Ejea aaa. e
Voltage Selector
EUROPEAN GENERAL
220V
Setting positions are 220V/240V (European) and 110/120/
220/240V (Genera!)
1
CONNECTION AND OPERATION
1. AC CONNECTION
1 As the rated power consumption of the M-4
is 900W (European model), do not connect it
to an additional AC receptacle on some other
piece of equipment, but plug it directly into
a wall outlet.
2 Regardless of the position of the power switch,
the additional AC power outlet on the rear
panel of the M-4 provides AC power for a
maximum consumption of 100W. (General
Export models only)
2. SPEAKER CONNECTIONS
Use speakers with an impedance of 482-1682
(General, European model) and 852-160 (the
others) and connect them either to the A- or B-
terminals on the rear panel. When using two sets
of speakers at the A- and B-terminals simultane-
ously, be sure to use only speakers having an
impedance of 82-160. (1690 for British,
Australian, North European models)
Confirm that the polarities (+ & —) are correct and
connect the cords of the left speaker system to the
L-side terminals and the cords of the right speaker
system to the R-side terminals.
Be careful to establish correct polarity because:
reversed connections to one speaker will lead to
unnatural sound and poor bass reproduction.
3. CONNECTION TO CONTROL AMPLIFIER
® Switch off the power to the control amplifier
as well as to the power amplifier.
® Connect the output from the control amplifier
to the INPUT terminals on the rear panel of
the M-4, being careful to connect left to left
and right to right channels.
LEVEL CONTROLS
e Level controls are provided on the rear panel
to adjust the M-4 for use with any contro!
amplifier.
The upper knob is for the left channel and
the lower one for the right channel.
If the sound is distorted by using a control
amplifier with a high output, lower the input
sensitivity by turning these knobs counter-
clockwise.
MODE SWITCH
e The M-4 has a flat frequency response down
to DC, which will lead it to amplify even
very low frequency noise such as caused by
record warp and wow of the turntable. This
can have adverse effects on the reproduction
of the program material.
Control Amplifier
> + L ch LEVEL
Control
Rch LEVEL
Control
Speaker Systems Speaker
Systems
When listening at low volumes
Volume adjustment of the contro! amplifier can
be facilitated by turning the set's LEVEL con-
trol counterclockwise a little. But if turned fully
counterclockwise, no sound will be produced.
MODE Switch
Q AC
INPUT \ 9 а
“DC
Speaker Output
Power Amplifier E o
Input Terminal
Input Capacitor
| o MODE Switch—DC
=
xD
vo 7
o +! .
a # 1
© 70
@ ro
ba ——— MODE Switch—AC
t :
f ! {In the AC mode, frequencies roughly below
! ! 10Hz will be cut off.)
to
o
g
o
Frequency (Hz)
©
ONO > 900 D00000000090000000060000000O0O0OGOCOODOOCOQD0000000CO9O9I00COO9O2DOI0OIOOOIDOPOOOOOODOOOOOIOOOOOOIO
OO O O O OI COOP PODES FVÔOTIOGOOIOGOOODOQOOODOOIOOOODOQCODOCOOODODO TOO III FOOOOOOOOOOCOGOOCOOOO
ООО a НООНОВНОООБООО800б0зю000о00б0060б9000000 QOOLCOOIOTOOOAO0C 0090000900905 FOGOOTIOGÉ POOQ00OCQOOQCO00Q0000Q
VUONACOIOOTOOHACOOOOCONOOGOODOCOODIOCODIDOODODOOOIOOOOOGOOIIOOQUGG DOOOOOOOCOOOJOCOGIOCOGICOQOS (GOODOCO POOOODOOOOIOCOOGOCOOOOO
ÉOÔSÉÉAHHS ООО FOOIOCOOIOOCOODONHODAOGOOIOCONOOOOIOCOODICODODODODUCODICCODIE PAOTIOGUOOOO COPOOOODICOIIGOO DIOOVOOCODIVQOOOGHOS 200)
OBBORGOOADOOBGBOOHOCOO0OFIOPIDOOHACONHDEHOOICOCINROOOREOORVAOVROOVCCOOLOLOVVNGOOVVCOOTVVVVVCOOHVCODITOOVVCONVVOONCOOICE
BAO 0000 SBONGSLOCHDA OOOOO0GO о OOQOOQOGOCOIGOOIOCOOIOCOOIOCOOO QCOOGCOOOOCOOBOQOCOOIO0 ООО) касс
сооооосооресоосовеосовооф IOCOOOOOOGOCTOIICONDOOGO ODICOCOGOSCODæ 2000000 LRRD DCQOOOCOOOoQODOCOQOOCODROCQCOOCOQOQOCOOO0O0000
Q0Q000 ÉCOODRÉÉOOAIOOOSHAAAOGHÉCOPDIOGOOGIDÉOBOODOOOCOGOOGOOOGCODIICOIIOTOPIOOOIONDOIOIOOIVGOOIOOOIOGOOOGOOPOOOOOGOOOOGOOGIDOODOO
SEDO SRCOOGOCOOHOCOOOOCOP ООО A E OOOO CIO DOCOODOIOCOO ‚о DEQOQ0000090000000090C00000000000000000000
ARO OOO 560 FS O0O00CO05O00000COPOOCOODDCOOLOCOHOODGOON SHOOCOO00OOGOOOLACOOIDCCOO0COOO0COOOOCOOLOOOOON0OOOCONOHCCGHOODOCCOHTCOOOTCOLID0
GO YAMAHA NATURAL SOUND STEREO POWER| AMPLIFIER MA-4
FOVER SPEAKERS E OUT PUTI LEVEL
LEFT da -40 зе -=0 -10|--5 0
Е =
BO 0.017 a + 10° зе 100 SVERLOAD
——
RIGHT ca —40 -380 ~20 -40 -5 a
OPOWERÍswitch)
@SPEAKERS(A and B) @OUTPUT LEVEL
(PEAK and OVERLOAD INDICATOR)
When this button is depressed, power to the These two push-button switches govern the two These peak indicators provide visual indication of
unit will be switched on and the switch will light speaker terminals À and B. When depressed, the the left and right output levels. They cover a range
up. When depressed again, power is turned off. speaker set connected to the respective terminal of 0.0032W to 100W (82) (—45dB to OdB).
1 Due to the action of the muting relay, no will be connected and the switch will light up. Note: Also that the meters are calibrated accu-
sound will be heard for several seconds after Depressing the switch again will disconnect the rately for output power into standard 82
switching on the power. This prevents any speakers. speakers, but that corrections must be
transient switching noises from reaching the When using both terminals at the same time, applied if speakers with different imped-
speakers. refer to “Speaker Connections” (p. 6) regarding ance are used.
2 Be sure to turn down the VOLUME control speaker impedance. For 40 speakers the readings should be
on the control amplifier to minimum before The SPEAKER switches should be turned off multiplied by two (i.e., a reading of 50
turning on the POWER switch to guard the when changing the connection of the speaker watts indicates an output power of 100
speakers against any sudden loud program cords, and they can be used in other cases, such watts), and for 16 speakers the reading
sounds produced after the muting relay time. as changing program sources etc., as well.
should be divided by two (i.e., a reading
of 50 watts is really only an output pow-
er of 25 watts).
Clipping (at about 1% THD) is indicated for the
left and right outputs separately by the OVER-
LOAD indicators. When these light up, turn down
the input level by using the LEVEL controls on
aly
Rated Output Power
120W + 120W (892, 20Hz-20kHz
Harmonic Distortion
0.005% T-H-D) (R, E}
Less than 0.005%
3 (Cs)
170W + 1170W (402, 20Hz-20kHz
(82, TOHz-20kHz, 60W)
2 (Dual FETs)
0.01% T-H-D) (R, El
(R, E)
32 (Diodes), ? (Dual Diodes)
100W + 100W (842, 20Hz-20kHz
(82, 1TOHz-20kHz, 5OW)
2 (Bridged Diodes)
0.005% T-H-D) (G, B, A)
(G, B, A)
6 (Zener Diodes)
Power Band Width
Less than 0.02%
24 (Green LEDs)
10Hz- 100kHz
(852, 100kHz, 60W) (R, E)
(892, GOW, 0.02% T-H-D)
(882, 100kHz, 50W) (G, В, А)
(В, Е)
IM Distortion (EJAJ, IHF, DIN)
(82, 50W, 0.02% T-H-D)
Less than 0,002%
(С, В, А)
(80, 50Hz : 7kHz=4:1, 60W)
Damping Factor
(В, Е)
200 (82, 1kHz)
(82, 50Hz: 7kHz=4:1, 50W)
100 (452, 1kHz)
(G, B, A)
Input Sensitivity/Impedance
Channel Separation (L +R, R — L)
4 (Red LEDs)
Rated Voltage
E : 220/240V AC, 60Hz
R : 110/120V/220/240V AC,
50/60Hz
G : 220V AC, 50Hz
B,A : 240V AC, 50Hz
Rated Power Consumption
R : 3B0W B : 50OOW
1V (100W/82)/25kS2, BOOpF
20dB (82, 1kHz, GOW) (R, E)
G,A : 450W E : 9200W
Frequency Response
(82, 1kHz, 50W) (G, B, A)
AC Outlet
MODE “DC” 82, GOW (R,E) « 50W (G,B,A)
70dB (82, 20kHz, 60W) (R, E)
100W Unswitched x 1
(802, 20kHz, 5OW) (G, B, A)
(R only)
Filter Characteristics
Dimensions
MODE “AC” fc = 6,4Hz, —6dB/oct (Low Cut Filter)
W: 435, H: 145.5, D: 374.5 mm
Peak Indicator
(17-1/8") x (5-3/4"") x (14-3/4""}
Indicator Point OdB=100W (82, TkHz)
Weight
Indicator Level OdB-—45dB (—5dB step)
18.5kg (40.8 Ibs)
10Hz : OdB
1kHz : ЯВ
100kHz . —0.7:0.5dB
MODE “DC” 80, 60W (R,E) - 50W (G,B,A)
10Hz : —1.56-0.5dB
1kHz : OdB
100kHz . —0.7+0.5d0B
Attack Time : 1004 sec.
Specifications subject to change without notice.
Release Time 1.2 sec. (—45dB <— 0dB)
Signal-to-Noise Ratio
118dB (IHF-A Network, RL=82,
Overload indicator
R: GENERAL A: AUSTRALIAN
Indicator Level 1% Distortion
E: EUROPEAN, G: NORTH EUROPEAN,
1k52 terminated at Input terminal)
Residual Noise
(82, 10Hz-20kHz)
B: BRITISH
32uV 182, 1HF-A Network,
Number of Semiconductors Used |
77 (Transistors)
Input VR min.)
4 (Dual Transistors)
©
©
TOTAL HARMONIC DISTORTION (%)
ma
PRE DRIVE AMP POWER AMP '
| ТА
| _
|
| ” SPEAKERS
| PC as pa Ш
INPUT LIMITTER [© I +9
x, | o
1
T
I
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}
MUTING 8
+ 65 V
= -4— +80V SPEAKER
DC REG PROTECTOR
SPEAKERS
+12у L R LR POWER
4 A A A TRANSFORMER
+80V +B POWER SW
POWER IND u F.S
Lem 7 |=)
AC IN
+12V RECT + 80V RECT
Frequency vs Distortion Characteristic Output Power vs Distortion Characteristic Output Power vs Intermodulation Distortion Characteristic
INTE RMODULATION DISTORTION {%)
TOTAL HARMONIC DISTORTION({%)
OUTPUT POWER (W) OUTPUT POWER(W)
FREQUENCY (Hz)
(NET)
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UBLESHOOTING
Symptom
Cause
Remedy
Power will not turn on although POWER switch is ON.
Power cord plug is not firmly inserted into AC outlet.
Re-insert power plug into AC outlet in a firm manner.
Power does not turn on when power plug is inserted into
AC outlet,
Contact an audio serviceman at your nearest Y AMAHA
dealer.
No sound produced from the right and left speakers, or
either the right, or left speaker.
Insufficient connection between control! amplifier and
power amplifier, or between power amplifier and speakers.
Check and confirm connection, or operation.
BALANCE control of the contral amplifier has deviated
either to the right, or left side.
Properly re-adjust BALANCE control of control amplifier.
LEVEL control turned down too much. {Turned too far
counterclockwise.)
Turn LEVEL control clockwise.
Sounds suddenly cease to come out during PLAY.
Speaker's protective circuit is working because a DC po-
tential not less than 2.4V has generated at the speaker's
output terminal.
When the potential of the power amplifier becomes zero,
the relay will be actuated, causing the circuit to be
connected.
Turn off the POWER switch of the power amplifier.
Wait a little while and turn it on again.
Abnormality inside the circuit.
Contact an audio serviceman at your nearest YAMAHA
dealer.
Unnatural reproduced sounds with poor bass and instable
stereo image.
The phases (+ and —) of the power amplifier not match-
ing those of the speakers,
After matching the phases properly, re-connect.
Sufficient volume not obtained when VOLUME control
of control amplifier is turned up.
input LEVEL control is turned counterclockwise.
Adjust to proper volume by turning input LEVEL con-
trol clockwise.
Loud humming generates during program audition,
Insufficient contact of pin plug.
Re-insert pin plug in firm manner.
Earth line of turntable not connected to GND terminal
of control amplifier.
Connect earth line to GND terminal of control amplifier,
SINCE 1887
YAMAHA
NIPPON GAKKI CO, LTD. HAMAMATSU, JAPAN
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