Sony MX-P21 User manual

SPECIFICATIONS
Power requirements
AC US and Canadian models:
120 V ac, 60 Hz
UK, AEP models: 110—120 V or
220—240 V ac (adjustable by Sony
personnel), 50/60 Hz
DC 12V car battery by using the optional
DCC-16A, DCC-16AE, DCC-16AW car
battery cord
Power consumption AC 28W
DC 12V, 1.8A
Operating temperature
0°C to 50°C (32°F to 122°F)
Storage temperature -20°C to +60°C (-4°F to +140°F)
Dimensions Approx. 482 x 130 x 448mm (w/h/d)
(19x 54, x 177/, inches)
excl. projecting parts
Weight Approx. 12.6kg (27!bs 1302)
Supplied accessories AC power cord (1)
AC plug adaptor (1)
(except US, Canadian and UK models.)
— Continued on page 2 —
MICROFILM
US Model
Canadian Model
AEP Model
UK Model
Revised -2
AUDIO MIXER
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY SHADING AND MARK
A ON THE SCHEMATIC DIAGRAMS AND IN THE
PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS
WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS
MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.
ATTENTION AU COMPOSANT AYANT RAPFOR T
A LA SECURITE!
LES COMPOSANTS IDENTIFIES PAR UNE TRAME ET
UNE MARQUE A SUR LES DIAGRAMMES SCHE-
MATIQUES ET LA LISTE DES PIECES SONT CRITIQUES
POUR LA SECURITE DE FONCTIONNEMENT. NE REM-
PLACER CES COMPOSANTS QUE PAR DES PIECES
SONY DONT LES NUMEROS SONT DONWES DANS CE
MANUEL OU DANS LES SUPPLEMENTS PUBEIES PAR
SONY.
SERVICE MANUAL

MX-P21 |
(O0dBs =0.775V)
Inputs
Reference
input
Maximum
input
,
Balanced
or
Cc
onnector Channels level ‘eval Input impedance unbalanced
MIC INPUT less than
(CANNON
XLR-3-31
type)
8
—60dBs
OdBs
600
ohms
balanced
LINE
INPUT
10dB
5
i
bal
d
(phono
jack)
8
-10dBs
15dBs
50
kilohms
|
unbalance
PHONO INPUT '
(phono
jack)
6
-—44dBs
(1
kHz)
—14dBs
(1
kHz)
50
kilohms
unbalanced
SUB INPUT !
(phono
jack)
2
-10dBs
15dBs
10
kilonms
unbalanced
i
EXT MON INPUT ;
(phono
jack)
2
(stereo
x
1)
-—10dBs
15dBs
10
kilohms
unbalanced
Outputs
Reknacisi
Ch
|
Reference
output
Maximum
output
Suitable
load
Balanced
or
-
ater
level
level
impedance
unbalanced
LINE OUT
(CANNON
XLR-3-32
type)
2
(stereo
x
1)
4dBs
24dBs
600
ohms
balanced
;
more
than
LINE (phono jack) 2 (stereo x 1) 5dBs 15dBs 40:kilohms unbalanced
;
more
than
AUX (phono jack) 2 (monaural) 15dBs 40: Kilchmns unbalanced
:
more
than
MONITOR (phono jack) 2 (stereo x 1) 15dBs 10 kilohms unbalanced
PHONES (phono jack) 2 (stereo x 1) 50 mW (8 ohms) more than 80hms unbalanced
‘ more than
TB (phono jack) 1 (monaural) 5dBs 15dBs 40 kilenis unbalanced
Frequency response 20-20,000Hz (1?2dB at 1kHz)
Harmonic distortion (20- 20,000 Hz)
Less than 0.3% under maximum
input/output level
Equivalent input noise
Microphone inputs (input 150ohms terminated, 20- 20,000 Hz)
Less than -126dBs
Line inputs (input short-circuited, 20- 20,000 Hz)
Less than -80dBs
Inherent noise
Master fader at 0 Less than -85dBs
Channel fader at 0 Less than —-70dBs
Cross-talk (at 1kHz) More than 60dB
Built-in oscillator 1 kHz sine-wave
Equalization characteristics
(See “OPERATING CURVES” on page 3.)
Low-cut filter
Cut-off frequency 120Hz -3dB
Attenuation 12 dBioctave
(See “OPERATING CURVES" on page 3.)

| MX-P21 MX-P21 |
SECTION 1
OUTLINE
OPERATING
CURVES
FEATURES
1-1.
LOCATION
OF
PARTS
AND
CONTROLS
Note: Negative numbers coincide with those on pages 5 through 7.
Equalization
characteristics
POWER
AND
INPUT
SECTIONS
OUTPUT
SECTION
The
Sony
MX-P21
has
been
designed
to
be
multi-purpose
audio
mix-
er
capable
of
performing
all
the
essential
functions
required
fora
public
address
system,
radio
and
TV
broadcasting,
studio
record-
ing
and
tape
editing.
8
channel
inputs
with
various
adjustment
possibilities
Each
input
can
be
independently
adjusted
to
suit
the
connected
equipment
and
to
provide
excellent
mixing
results
from
its
own
low-
cut
filter
and
equalization
circuits.
With
the
PAN POT
(panoramic
potentiometer)
function,
each
input
sound
image
can
be
positioned
to
the
desired
spot
between
the
L
and
R
stereo
output
channels.
MID (min.)
|
Auxiliary
inputs
and
outputs
for
additional
mixing
effects
By
connecting
an
echo
machine
or
a
reverberation
unit,
additional-
ly
desired
sound
effects
may
be
easily
obtained.
One
of
the
outputs
can
be
used
to
supply
signals
to
a
fold-back
speaker
for
players
on
the
stage.
Response (dB)
100 1k 10k 20k
Frequency
(Hz)
Monitoring
of
various
signals
Each
line
and
auxiliary
output
signal
can
be
monitored
either
with
headphones
or
speakers
for
accurate
mixing.
in
addition,
the
PFL
(pre-fader
listening)
function
permits
direct
monitoring
of
each
of
Low-cut filter characteristics
na
7:
f
jf
es
e
J
e
°
°
fe
°
the
original
incoming
signals.
ee
ee
ive
:
Oo
O
ierre.
Talk-back
function
indispensable
for
studio
use
&
-
=
bg
:
:
3 3
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ee
2
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=
The
built-in
microphone
enables
the
operator
to
directly
communi-
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cate
with
those
in
the
studio.
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table-top
design
can
be
easily
converted
for
rack-mounting
in
a
ele
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poo
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19-inch
standard
rack
or
in
specified
racks
designed
for
Sony
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U-matic
video
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2-way
powering
for
the
unit
plus
microphones
The
built-in
DC-DC
converter
enables
stable
operation
from
either
a
r
|
|
|
12V car
battery
or
an
ac
power
supply,
or
both. Furthermore,
the
unit
can
supply
48
V
dc
to
each
of
the
connected
phantom
powered
condenser
microphones.
|
1]
100
tk
10k
|
Frequency
(Hz)
Supplementary
functions
for
full
creative
flexibility
—
Built-in
oscillator
to
supply
test
and
balancing
signals.
@
@
poweercrecereseserecererececesererosecscscereceserereres
—.Through
function
which
allows
input
signals
to
bypass
the
MODEL
IDENTI
FICATION
mixing
circuits
for
direct
output.
MONITOR
SECTION
~—Cascade connectors to multiply input channels.
— Specification Labels —
SONY. MODEL NO. MX-P21
AUDIO MIXER
WLLL LLL
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D900 00F00°?
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DC:12V 1.8A
SERIAL NO.
MADE IN JAPAN
US, Canadian model: AC: 120 V 60 Hz 28 W
AEP, UK model: AC: 220 — 240 V ~50/60 Hz 28 W
=3=
—4—

PRECAUTIONS
On safety
@ Check that the operating voltage of your unit is identical to the
voltage of your local power supply.
For car battery operation, use the car battery cord recommended
for this set.
® Should any liquid or solid object fall into the cabinet, unplug the
unit and have it checked by qualified personnel before operating
it any further.
e Unplug the unit from the wall outlet if it is not to be used for an
extended period of time. To disconnect the cord, pull it out by
grasping the plug. Never pull the cord itself.
On installation
Do not install the unit in a location near heat sources such as
radiators or air ducts, or in a place subject to direct sunlight, ex-
cessive dust, mechanical vibration or shock.
On operation
When the unit is not used, turn the power off to conserve energy
and to extend the useful life of your unit.
On cleaning the cabinet
Clean the cabinet, panel and controls with a soft cloth lightly mois-
tened with mild detergent solution. Do not use any type of abrasive
pad, scouring powder or solvent such as alcohol or benzine.
On repacking
Do not throw away the carton and the packing material. They make
an ideal container to transport the unit in. When shipping the unit
for repair work or to another location, repack it as it was originally
packed at the factory.
If you have any questions about this unit, contact your Sony dealer.
OPERATING VOLTAGE
Before connecting the unit to an ac power source, refer to the serial
plate and check that the operating voltage of your unit is the same
as the local power line voltage.
The USA and Canadian models operate on 120V ac.
The models for other countries operate on either 110-120V or
220-240 V ac. The voltage adaptation must be performed by au-
thorized Sony personnel.
NOTICE FORTHE CUSTOMERS IN THE UNITED KINGDOM
IMPORTANT
The
wires
in
the
mains
lead
are
coloured
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
markings
identifying
the
ter-
minals 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
coloured
brown
must
be
connected
to
the
ter-
minal which is marked with the letter L or coloured red.
MX-P21
MX-P21 |
FUNCTION OF PARTS AND CONTROLS
POWER AND INPUT SECTIONS
@ MIC INPUT 1-8 (microphone input) connectors
(CANNON XLR-3-31 type) ;
For microphones. Pin arrangement
1: GND 2: hot 3: cold
© +48V (microphone power supply) switches
Set to ON to supply 48V dc, 7mA (max) to phantom powered
condenser microphones connected to the corresponding MIC
INPUT connectors.
© LINE/PHONO INPUT 1-6 jacks (phono jacks)
Accept line-out signals from tape decks and amplifiers, or
phonoout signals from record players equipped with moving-
magnet type cartridges.
@ LINE INPUT 7/8 jacks (phono jacks)
Accept line-out signals from a tape deck or an amplifier.
© Ground terminal
When connected audio equippment such as a record player re-
quires earth connection to reduce hum or other undesirable
noise, connect its ground wire to this terminal.
© SUB INPUT jacks (phono jacks)
Accept auxiliary input signais such as those from an echo
machine. |
@ FADER REMOTE 3/4 jacks (phono jacks)
By sliding up the channel faders of channel 3 and 4 from the
minimum (0) position, these jacks will be short-circuited to
switch on audio equipment connected via an appropriate inter-
face unit.
The permitted current to be supplied to these jacks is max.2mA.
© DC IN +12V (DC power supply) jack
To power this unit from a 12V car battery. For connection, use
the optional DCC-16A, DCC-16AE or DCC-16AW car battery cord.
to a cigarette
lighter socket
of a car
ex. DCC-16A
Note: Use only the recommended car battery cord manufactured
by Sony. Polarity of the plugs of other manufacturers may be dif-
ferent.
A
Polarity of the plug of the
Sony car battery cord
©
AC
IN
(AC
power
supply)
socket
@®
Channel
faders
Connect
with
the
supplied
ac
power
cord
to
an
ac
power
source.
Adjust
the
signal
level
of
each
channel
going
to
the
line
outputs
The
USA
and
Canadian
models
are
equipped
with
a
3-pin
socket
for
proper
balance.
The
position
7
(the
thick
line)
indicates
the
and the
modeis
for
other
countries
are
equipped
with
a
2-pin
reference
level.
socket.
For
the
customers
of
the
model
supplied
with
the
ac
plug
adap-
@
SUB
IN
1/2
LEVEL
controls
tor:
Adjust
the
signal
levels
from
SUB
INPUT
1
or
2
jack
@
respec-
If
the
plug
of
the
ac
power
cord
does
not
match
with
the
outlet,
tively.
use the ac plug adaptor.
@ SUB IN 1/2 PAN knobs
Position the sound image of SUB INPUT 1 or 2 in the desired
place between the output L and R channels.
@® POWER switch and pilot lamps
Depress the switch to turn on the unit.
When ac power is supplied, the AC pilot lamp will light.
When dc power is supplied, the DC lamp will light.
@ If both ac and dc power supplies are connected, the both the
AC and DC tamps will light.
OUTPUT SECTION
@ LINE OUT LIR (line output) connectors
(CANNON XLR-3-32 type)
® PEAK indicators Feed out the mixed line output signals (balanced).
Light up if the corresponding input signals level is within 5dB of
the
clipping
level.
Pin
arrangement
1: GND 2: hot 3: cold
@
INPUT
SELECT
switches
To
remove
Select the input sources. The switches of channels 1 to 6 have press here.
three positions; LINE, MIC, PHONO and the switches of chan- WV oO
nets 7 and 8 have two; LINE, MIC. iS
® MIC (microphone gain) controls
Reduce excessive microphone input level and prevent distortion.
Adjust these controls so that the proper level can be obtained
when each corresponding fader is set at 7".
@ LINE LIR (line output) jacks (phono jacks)
Turn the controls counterclockwise when the corresponding Feed out the same signals (unbalanced, however) as the
PEAK indicators light up. CANNON type connectors @.
@ LCF (low-cut filter) switches @ AUX 1/2 (auxiliary output) jacks (phono jacks)
When the switches are depressed, input signals below 120Hz — Each supplies monaural output signals independently of the line
are attenuated at a 12dB/octave rate. outputs @@. Connect to an echo machine or a power amplifier
to drive a foid-back speaker.
® EQ (equalization) switches and controls
When the EQ switches are depressed, the input signals pass @ TB ( talk-back output) jack (phono jack)
through the equalizer circuits. Adjust the controls to equalize While the TB OUT button of the TALK BACK buttons @ is de-
the sound sources. The Hi controls are for the high-frequency — pressed, the signal from the built-in microphone is fed to this
range around 10kHz, the MID controls are for the middle- jack.
‘frequency range around 2.8kHz and the LOW controls are for the
low-frequency range around 100 Hz. @ CASCADE IN/OUT connectors (8-pin DIN connectors)
For connecting two or more MX-P21 units in parallel to increase
® AUX 1/2 (auxiliary output level) controls the number of inputs.
Ajust the signals level of each channel going to the auxiliary out-
puts 1 or 2 respectively. Pin arrangement 1: AUX-1 5: PFL control
S72 2: GND 6: LINEL
® PRE (pre-fader) switches (Soe) 3: AUX-2 7: LINER
When the switches are depressed, the pre-fader signals of the y969 4: PFL audio 8: GND
corresponding channels can be fed to the auxiliary output 1. .
These are especially useful when the auxiliary output 1 is used Connection
8 inputs 8 inputs
for a fold-back speaker.
@® PAN POT knobs
These permit panning of the incoming signals between the out-
put Land R channels. The center click positions place the sound
images in the center.
CASCADE CASCADE
OUT IN
8-pin shielded cable
(max. 1m long)
Cc ist mixer 2nd mixer
The image v(; »y The image
moves to moves to
the left. e © ight.
C R the right
LINE OUT

@ MASTER L/R VU meters
Indicate the L'and R channel line output levels respectively.
(When
the
EXT
MON
switch
@
is
depressed,
external
signal
levels will be indicated.)
@ AUX 1/2 VU meters
Indicate the auxiliary output levels.
@ 7-8 THROUGH switch
When
this
switch
is
depressed,
the
line
input
signals
from
chan-
nel 7 and 8 can be directly output from the LINE jacks @ without
passing
through
the
mixing
circuits,
even
if
the
power
of
the
mixer is turned off.
Use this switch for copying tapes.
@ OSC (oscillator) switch
When this switch is depressed, a 1kHz sine-wave is fed to the
line
outputs
@@.
The
level
can
be
adjusted
with
the
MASTER
fader @.
® MIC (built-in microphone)
To send information from the mixer. The outputs to send can be
selected with the TALK BACK buttons @.
@ TALK BACK buttons
Select the outputs for the built-in microphone.
MASTER: line outputs @®
AUX-1 |
AUX-2 |
TB OUT: TB output jack ®
corresponding auxiliary outputs @
@ TB LEVEL (talk-back level) control
Adjusts the built-in microphone sound level.
@ MASTER fader
Adjusts
the
overall
signal
level
output
from
the
LINE
OUT
con-
nectors @ and LINE jacks ®.
The reference level is indicated by a thick line.
@ AUX OUT 1/2 (auxiliary output) faders
Adjust
the
output
levels
of
the
AUX
1
and
AUX
2
jacks
@
respec-
tively. ;
_MX-P2T
MONITOR SECTION
© PFL (pre-fader listening) switches
While the switch is depressed, the pre-fader signal from the
corresponding channel can be monitored through headphones
without affecting the main signal flow.
When the signal is to be monitored with the speakers connected
to the MONITOR jacks @, keep the speaker PFL switch @ in the
depressed position.
@ EXT MON (external monitor) switch
Depress to monitor the signals from the EXT MON INPUT jacks
®.
When the switch is depressed, the MASTER VU meters @ indi-
cate the external signal level.
@® PFL (speaker pre-fader listening) switch
When the switch is depressed, the original input signal corre-
sponding the depressed PFL button @ will be output from the
MONITOR jacks @.
@ PHONES (headphones) jack (stereo phone jack)
Accepts headphones having an impedance of 8ohmsor more.
@ PHONES LEVEL (headphones level) control
Adjusts the level of the headphones connected to the PHONES
jacks @®@.
@ MONITOR LEVEL control
Adjusts the output level to the MONITOR jacks @.
@ MONITOR SELECT switch
Selects the output signal to be monitored.
MASTER: line outputs @@®
AUX-1
AUX-2
The setting of this selector will have no effect when any of the
PFL switches @ or the EXT MON switch @ is depressed.
} corresponding auxiliary outputs @
@ MON MUTE (monitor mute) jack (phono jack)
To externally mute by 20dB the monitor outputs from the
MONITOR jacks @ by short-circuiting this jack.
@ MONITOR LIR output jacks (phono jacks)
To connect a power amplifier to drive the monitor speakers.
@ PHONES LI/R (external headphones) jacks (phono jacts)
Feed out the same signals as those from the PHONES jac k @ on
the operating panel.
@® EXT MON INPUT L/R (external monitor input) jacks (phono jacks)
To monitor external signals, for example; the montoring of
signals which have already been broadcast or recordei from the
mixer.

MX-P21
1-2, RACK MOUNTING
By removing the front and side panels, the MX-P21 can be mounted onto a 19-inch standard rack or one of the various racks designed
for the Sony U-matic video systems.
How to remove
Use a Phillips screwdriver.
~ Coa)
4 Remove the panels from the
rack-mount brackets.
fe
on Bp
oe 3 Temporarily remove the rack-mount
brackets from both sides.
2
Pull
out
the
panel
by
1 Remove the two screws on each side panel.
sliding it forwards.
5
Re-attach
the
rack-mount
brackets
to
the
sides.
Mounting example
Mounting dimensions

MX-P21 MX-P21 |
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(+48V)
MONI
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SELECT
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RVI04
[output LeveL]
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102-4
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AF
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MX-P 21
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output
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LED ORW aa ’ LED DRIV
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SELECT
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MUTING
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RVB03 AF AMP i ° @) @
(5)
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+48V poze \ CN905
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ra CONVERTER ret a [ac in]

MX-P21
MX-P21
MX-P21
SECTION 2
DISASSEMBLY
7 SIDE FRAI
Note: Follow the di bl d in th i i
ote ollow the disassembly procedure in the numerical order given. ORNAMENTAL PANEL CONNECTOR PANEL
2
Remove 4 (four) +RK3 x 8 screws and
4 (four) ornamental washers (3 mm dia.).
3) Remove 2 (two) +P3 x 8 screws and DDC bracket.
@ Remove 4 (four) +B3 x 6 screws sai
4 (four) lockwashers (3 mm dia.).
ORNAMENTAL @ Remove 2 (two) +B3 x 30 screws and
SIDE PLATES 2 (two) panel retainer rings.
WITH TABLE
\ @ Byu
. 2 . feigh
and i
@
Remove
2
(two)
+B3
x
6
screws,
2
(twa)
lock
washers
Qa Remove (two) +B3 x 30 screws and 2 (two}
(3 mm dia.) and 2 (two) rubber feet.
panel retainer rings.
*
@
Connector
panel
can
be
withdrawn
a
few
centimeters.
t
@ Pull off 11 (eleven) slide-contro! knobs.
(3) Lift ornamental panel upwards.
© Remove 22 (twentytwo)
+P3 x 4 screws and case lid.
MOUNT FRAME, SIDE COVER
AND POWER TRANSFORMER
@ Remove 3 (three) +P3 x 4 screws.
Remove 2 (two)
+PSW3 x 6 screws,
4
@ Remove 4 (four) +K3 x 10 screws.
(Both sides when required. ).
@ The fol.
covers r
rc
DC-DC
CONVERTER
AND
DC-DC
CONVERTER
@ Remove 2 (two) +B3 x 6 screws and CIRCUIT BOARD
2 (two) lockwashers (3 mm dia.).
@ Remove 2 (two) +B2 x 6 screws
and side cover (right).
mount frame and
mount-frame cover
@ Remove 4 (four) +P3 x 12 screws and 4 (four)
transistor brackets,
(8) Circuit board checking can be made in the following
condition with power applied and without transistor
brackets for a short period of time.
@Q Remove 4 (four) +B3 x 6 screws,
@ Remove 7 (seven) +B3 x 6 screws.
@ +P4x 10 (four) fastening
power transformer.
@ Hold nuts through this
slot and remove a +P4 x 10
screw at position A.
Other 3 (three) nuts can
be held from the bottom.
Remove 2 (two) +B2.6 x 8
screws, LED block (LED
circuit board) and 2 (two)
collars. Collars are located
between LED block and
chassis.
@O Fe
PG
sich
1 @ Remove 2 (two) +PSW3 x 6 screws.

astening
BA
P4x 10
scan
ttom.
326x8
(LED
2 (two)
located
k and
CONNECTOR PANEL
C1) Remove 4 (four) +B3 x 6 screws and
4 (four) lock washers {3 mm dia.).
@
Remove
2
(two)
+B3
x
6
screws,
2
(two)
lockwashers
(3
mm
dia.)
and
2
(two)
rubber
feet.
©
Connector
panel
can
be
withdrawn
a
few
centimeters.
t
CIRCUIT BOARD
@ Remove 2 (two) +PSW3 x 6 screws,
[
=n
RR
ARANEDSED
ANIA
ROA
CONVERTER.
DC-DC
CONVERTER
AND
DC-DC
CONVERTER
MX-P21
© Remove 2 (two) +P3 x 8 screws and DDC bracket.
(4) Remove 22 (twentytwo)
+P3 x 4 screws and case lid.
© Remove 3 (three) +P3 x 4 screws.
@ Remove 2 (two)
+PSWS3 x 6 screws,
@ Remove 4 (four) +P3 x 12 screws and 4 (four)
transistor brackets.
(8) Circuit board checking can be made in the following
condition with power applied and without transistor
brackets for a short period of time,
SIDE FRAMES, REAR COVER AND FRONT COVER
C1) By using a long phillips-head screwdriver, remove &
(eight) +PSW3 x 6 screws. Side frames, rear cover
and front cover can be removed together upwards.
The
following
showns
unit
with
side
frames
and
covers
removed.
@ Remove 5 (five) +PSW3 x 6 screws,
PGA board can be fanned out upwards using harness
side as pivot,
[ HaA-1, HA-2 AND SUB IN BOARDS
e"
a Br de le Tedd ed b et:
FEF TE PERE
=
e
s
8
.
a
ba
y
9
«
a
e
Y
t a
ind
ae
|
iy
PRG
jointly
PRT
SE
tem,
|
sunning
ERATE,
@ Unplug 3 (three) connectors,
© Pull off contro!/switch knobs and buttons, and,
remove all control/switch nuts.
HA-1 HA-2 SUB IN
4 ) Following shows unit with HA-1 board
for channel-1 removed.

MA BOARD
0 Unplug connectors
from CN601 and
CN801 through
CN805.
Note: Reconnect these connectors when checking the board
with power applied by pulling out the connectors.
@ Pull off all control/switch knobs/
buttons and remove control/switch
nuts,
TB AND OSC BOAR.”
CN702
C1] Unplug connectors
from CN601 and
ONIN threvayn
rey
CN601
CN701, 703
=
Note: Reconnect these connectors when checking the board
with power applied by pulling out the connectors.
@ Remove 1 fone)
+PS3 x 6 screw.
Q Pull off all switch knobs
and button,
HPA BOARD
0 Unplug connectors 3
from CN601 and
CN602, wd
Note: Reconnect these connectors when checking the board
with power applied by pulling out the connectors.
3} Remove jack nut.
2] Pull off all switch
buttons.
© Remove 1 fone +PS3 x 6
screw.
METER AND PS BOARD
@ Remove 2 (two) +PS 3x 5 screws,
board with power applied by pulling out the :on nectors,

MX-P 21
CIRCUIT BOARDS LAYOUT
meter and PS board
slide switch boards
MA board HA-2 boards (two) (CH-1 to CH-8) (eight)
TB and OSC board
HA-1 boards
(CH-1 to CH-6) (six)
Pani
HPA board
PUAN
DC-DC converter board SUB IN board PGA board
{inside of converter
shield case) LED boards {two}
(both same}

SECTION 3
MX-P 21
MX-P 21
ADJUSTMENTS
+5 V VOLTAGE ADJUSTMENT
When components in the DC-DC converter are re-
placed, perform the following adjustment.
Set Up:
DC-DC converter is properly connected to the rest,
ie., properly loaded. Use adequate line (mains)
voltage.
Procedure:
Adjust R18 so that the test-point (output line of
+5 V) voltage becomes in +5.00 V.
Adjustment Location:
— DC-DC converter board —
test point
LEVEL METER ADJUSTMENT
Set Up:
PAN control: _C (center click)
EQ switch: OFF
LCF switch: OFF
MIC LEVEL control: —60
LINE/MIC/PHONO switch: MIC
Procedure:
af osc
€) attenuator
O
MIC INPUT 1
1 kHz, —60 dB (0.77 mV)
LINE OUT (balanced):
+3.6 dB m (1.16 V)
AUX OUT: —5.4 aB (0.42 V)
. Adjust MASTER control so that balanced LINE
OUT level becomes in 3.6 dBm (1.16 V).
. Adjust RV302 (L-CH) and RV304 (R-CH) so that
MASTER level meter reads ‘‘0”’ indication.
LINE OUT MAXIMUM GAIN ADJUSTMENT
Procedure:
AUX 1 MAXIMUM GAIN ADJUSTMENT
Set Up: Set Up:
PAN control: C (center click)
EQ switch: OFF
LCF switch: OFF
MIC LEVEL control: —60
LINE/MIC/PHONO switch: MIC
PRE/(post) switch: post (not depressed)
PAN control: C (center click)
EQ switch: OFF
LCF switch: OFF
MIC LEVEL control: —60
LINE/MIC/PHONO switch: MIC
Procedure:
af
osc
af
osc
ae, attenuator
O
VTVM
© attenuator 6002 6002 7]
O
Oo——O Oo ©
scood = Rt
MIC INPUT 1 LINE OUT (balanced)
MIC INPUT 1 AUX 1 (OUTPUT)
1kHz,—-70dB(0.25mV) +14dB8 (3.9 V)
1 kHz, —70dB (0.25 mV) +15 dB (4.4 V)
Adjust RV301 (L-CH) and RV303 (R-CH) so that
the gain from MIC INPUT 1 to balanced LINE
OUT becomes in 84 dB.
Adjust RV305 so that the gain from MIC INPUT
1 to AUX 1 output becomes in 85 dB.
. Adjust AUX OUT 1 and AUX OUT 2 controls so
that AUX OUT 1 and AUX OUT 2 output levels
become in —5.4 dB (0.42 V).
. Adjust RV306 (AUX 1) and RV308 (AUX 2) so
that AUX level meters indicate ‘‘0”’.
Adjustment Location:
— PGA board —
Adjustment Location
— PGA board —
Adjustment Location:
— PGA board —
ay
Bik:
RV304 RV306 RV308
(R-CH) (AUX 1) (AUX 2)

AUX 2 MAXIMUM GAIN ADJUSTMENT
Set Up:
PAN control: C (center click)
EQ switch: OFF
LCF switch: OFF
MIC LEVEL control: —60
LINE/MIC/PHONO switch: MIC
Procedure:
af osc
@) attenuator
oO
MIC INPUT 1 AUX 2 (OUTPUT)
1 kHz, -70 dB (0.25mV) +15 dB (4.4 V)
Adjust RV307 so that the gain from MIC INPUT
1 to AUX 2 output becomes in 85 dB.
Adjustment Location:
— PGA board —
| MX-P21
MX-P 21
EXTERNAL MONITOR LEVEL ADJUSTMENT
Set Up:
EXT MON switch: ON
MONITOR LEVEL control: 10 (maximum)
af osc
oD attenuator 6002 10k2 el
oO
o—o O
sfeooat Yo HE
EXT MON INPUT MONITOR
1 kHz, —10 dB (0.25)V) +5 dB (1.4 V)
Adjust RV802 (L-CH) and RV803 (R-CH) so that
output
level
at
MONITOR
L
and
MONITOR
R
jacks become in +5 dB (1.4 V) respectively.
Adjustment Location:
— MA board —
TEST OSCILLATOR OUTPUT LEVEL
ADJUSTMENT
Set Up:
MASTER control: center of wide line at 7
OSC switch: ON
SELECT switch: MASTER
Procedure:
VTVM (AC)
LINE OUT (CANNON)
+4 dB (1.2 V)
Adjust RV703 so that output at cannon LINE
OUT connector becomes in 4 dB (1.2 V).
The oscillator frequency should be 1000 Hz +10 %
and the distortion should be within 1.0 %.
Adjustment Location:
— TB & OSC board —
RV703

X-P21 |
10
41.
A
B
FRAME WIRING DIAGRAM
SECTION 4
DIAGRAMS
Cc D
Jl02-3 . sl02-4 JlO2—-11 Jl02—12
EXT MON MONITOR
-L- RO ALORS
e saf |= aay
=| 22) |e =| el &
- 2 =
- (3 5 6
CNJ6O!
{HPA BOARD]
G
Jl02—-9 JI02 ~ 10
(SEE PAGES 42 ~- 44)
(ORG)
CN505 (F)
{CASCADE _1N
{SUB IN BOARD}
JlO2—-1 02-2
JlOl-6
SUB ales CN8I5 JO1-7 cN715 LINE/ PHONO cN6I5
see wepe LINE INPUT 8 INPUT 6
WHT/GRN
CN201
[HA-2 BOARD]
[HA-2 BOARD] [HA-1 BOARD] wv
| II (SEE PAGES 40,41) | #2 #| |
’ # 6 (SEE PAGES 28-
WY seey naa cue (SEE PAGES 31-33) (SEE PAGES 31-33)
3.3V
euees
“144
.
net
14.4V
12.3V
re
c
16.6V
re
Ae
16.6V
cwion
744
14 CONDUCTOR 1 B2 93 of 7 98 09 gIOgll le BI3h14 1 82 93 08 09 6 of 08 69 QlOol! fel L4h5 1 6243 A £ o! 6 LOH 2 Seay! | 82 63 fo 660! 08 lO Gl ol2 13914 o|5 62 034 0d 7 68 69 Goll (i213 914 9/5 T YY 45 6 7 8910-1
FLAT CABLE : BLK +t+ . =
= MARKING : WHT
(1,6,11 PIN} | g2 3-4 “5 6 7-8-9 “1071 2K 3g 14
j : jl 13.3V N72 ays
2 it 2 -14.4v >
B.3V—T3 it Sf 13.3V
| 4 ‘ ! 4 |
5 ut 5
{MA BOARD] cnacs {6 ‘e'—1 66| cn701 {TB & OSC BOARD)
(SEE PAGES 49 -52) : Paes (SEE PAGES 45 - 48) i ay
ae een eee
| 1 ag 1
igs 2 EE ase | er oe
CN802
CNB0!
14.4V
ENIOS
is
Rv309
TR
T 92 93 of o® of T 92 3 of oD 06 of of \4.av ms _ _I Sk-A 2
= z 12 CONDUCTOR
S588 saeasa|2z FEAT, GABLES EEK ACCS CSTE
=
Upe P3 m4 8s % ©7 98 9 1011 12 3 piapis a
16.6V CN301 “14.4V CN304 CN305 CN306 CN307
3.3v fe by i.av “eh
13.3V ee ae os L=¢H
2)
cn303
:
io
HK
ee
:
:
b Boal Als
it
ae
kage
R-
CH
ax
ee
\ WHT} 31
(SLIDE SWITCH BOARD] ae :
ons f 54 [PGA BOARD ]
mK ‘ aut (SEE PAGES 34-39)
J02-7 wag 36
a = : c CONVERTER
(aux) “EL? é
reo J 70 i :
- (BLK) CieLKiy PUT
12 ogo [ pea | wr
5
TisK) 73 | '
L
(SEE PAGES 25-27 )

P21
MX-P21
MX-P2
44av
44av
Y
:
JI0I-6
Jlol-5
Jloli-4
Jl02-15
JIOlI-3
Jl02
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$506
| 2
|
CNIO3 i
{HA-|
BOARD]
iva
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{HA-|
BOARD]
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{HA-|
BOARD)
#
6
(SEE
PAGES
28-30
#3(SEE
PAGES
28-30)
#
1(SEE
PAGES
28-30)
|
:
13,3V
“133V
set
BBV
16.6V
cniog
7
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CN
102
eV
cnloz
-14.4V
16.6V
cniog
14.4
3
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08
09
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2
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15 CONDUCTOR FLAT CABLE; BLi
44v 44av
Note:
e « :(US)...... Serial No. up to 820100
(Canadian). . . Serial No. up to 730000 5
(AEP) ..... Serial No. up to 540100
(UK)... ... Serial No. up to 660000
@e«* : (US) ......, Serial No. 820101 and later lye et ee
o
dey
TERIA
ee
Ries
(Canadian).
.
.
Serial
No.
730001
and
later
v
us,
CANADIAN
|
[LED
BOARD
(1
)
Jose
(ASTER)
GREEN:
TLGI24
[LED
BOARD(2)]
_
os06
GREEN
:
TLG124
(AEP)
.....
Serial
No.
540101
and
later
POWER.
TRANSEORIER
i
r—— REO. —-;>————GREEN ol RED —4r— GREEN (UK) ...... Serial No. 660001 and later
CN406
(OlOTOTelerelelerelelelelerere)
[]
C0C0000000000000
6
abs
fr] OODOODODOCOCCCCO00CO OOO0CCOO0CO0000CO0O
19 18 17 16 15 14 13 12 109
CN407
Dhl
7
|
CN906
| 0908,909
DC
—DC
[LED
BOARD(3)]
TLRI24
;
RY901
CONVERTER
8
D [METER & PS BOARD ] wee SOURCE,
:
(SEE
PAGES
53-56)
VOPERATIN.
9
Note:
e & : signal path
e B+ bus.
Note: Les composants identifies par un trame et une eo ———: B- bus.
marque \sont critiques pour la sécurité. Ne les
remplacer que par une piece portant le numero
specifie.
Note: The components identified by shading and mark
are critical for safety. Replace only with
part number specified
Voltages are measured with a VOM (50k22/V).

4-2. MOUNTING DIAGRAM (1)
@ DC-DC Converter Board
MX-P21 MX-P21
4-3.
SCHEMATIC DIAGRAM (1)
@ DC-DC Converter Board
B
10
@ Semiconductor Lead Layouts
MB3759 2S8A1175
i 2S8C2785
Note:
line
if
n+]
@ O—-: parts extracted from the component side. ne
@ * : (US) ...... Serial No. up to 820100 or :
(Canadian).
. .
Serial
No.
up
to
730000
dot
12
n
(UK)
......,
Serial
No.
up
to
660000
aoe
Mew
:
SAWS)
sce
ie
ae
ial
No.
8201
lat
CB
=e ae dian) a i F000 a ier posed
anadian}).. .o€rla oO. an ater 2SC2334
(AEP)
2
j25
2-8
All
~~
;
oe
eee
Serial
No,
660001
and
later
.
: pattern
a a
|
\
ca =
TO METER & PS
BOARD
(INPUT)
ESAC31-02D ESAB85-009 RDS.6EB3 ERB44-02
. RD7.5EB3
Ss 182348H
cathode '
alia Ky cathode
~. anode
anode
10
a ——————
Q4,5
2801049
INVERTER
Q2
28C278
Q6
mane
\ 28C2334
RIPPLE FILTER
D2
RD7.5EB
C10 RQ
1 0047/50 1 47k
a4 =
av MD = 02
| > Ri
o,. OV
7.2V
RI2
10k
4 100 Gro a : 0 POWER TRANSFORMER hy
H = BHIELD. ‘ :
= D3 04
a oi So 36 ySEC es
25V - pee
=] a i6Vp-p
~15.3V bay Bo 5
Q7 98 D8 arr) D3,4
2802334 2SAl012 ESAC3i-02DC ESAC31-02DN 1$1588
RIPPLE FILTER—— RECT RECT
xR
Note:
e@ All capacito
50WV or le
and tantalur
e All resistors
kQ : 1000!
Eat : non
("—_] : adjt
Readings ar
VOM (50 ké
: (US).
(Canad
(UK) .
: (US) .
(Canad
(AEP)
(UK).
e
e *

MX-P21 MX-P21
4.3, SCHEMATIC DIAGRAM (1)
@® DC-DC Converter Board
e H I J oA B Cc
| MX-P21
ICI
MB3759
CONTROL
1
= aK ~ a
ay sor 5 SANIT shi
2SD1049. 2SC278 2SAll 23 )SEC 2SA1012
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