Technics SX-PX107 User manual

ervice Manual
ORDER NO. EMIDS 1440 -
PCM Digital Piano
OX- PX1 07/PX107M
M), (MC), (XM), (EN), (EH), (EF), (EZ), (EW), CEA),
(EP), {EK), (XL), (XR), (XS), (XD), (X), (XT)
AREAS
f (Mj): U.S.A. (EK}: the United Kingdom
(MC): Canada (XL}: New Zealand
(XM): Mexico (XR): Australia
(EN): Norway, Sweden, (XS): Malaysia, Singapore,
Denmark, Finland South Africa
(EH): Holland, Belgium (XD): Saudi Arabia, Kuwait
(EF): France, ltaly (X): the Middle East,
(EZ): Germany Indonesia, Hong Kong,
(EW): Switzerland the Philippines,
Photo: SX-PX107M (EA): Austria Thailand
Spain, Portugal, Greece (XT): Taiwan
= Specifications
CABINET
KEYBOARD
SOUNDS
\ (EP):
SX-PX107; BLACK, SX-PX107M: WALNUT
88 KEYS (MAX. POLYPHONIC 64 NOTES)
GRAND PIANO, UPRIGHT PIANO, ROCK PIANO, & PIANO 1, EP PIANO 2, E GRAND, HARPSI, VIBES,
STRINGS, PIPE ORGAN
BRILLIANCE
DIGITAL CELESTE
SOFT, SOSTENUTO, SUSTAIN —
MELLOW, BRIGHT (5 STEPS)
DIGITAL REVERB
TOUCH SENSITIVITY
TRANSPOSE
METRONOME
SEQUENCER
DISPLAY
DEMO
ROOM, STAGE, HALL, CONCERT
LIGHT, NORMAL, HEAVY
G-C-F
© (TIME SIGNATURE: OFF, 2/4, 3/4, 4/4, 5/4, 6/8)
TRACK (1, 2), STORAGE CAPACITY: APPROX. 4000 NOTES, RECORDING MODE: REAL TIME
MULTI TIMBRE, LOCAL CONTROL, OMNI ON, PROGRAM CHANGE, TRANSPOSE, PEDAL, EFFECT
MIDI
MODE SET
OTHERS
OUTPUT
SPEAKERS |
POWER
REQUIREMENT
DIMENSIONS (WxHxD}
NET WEIGHT
14¢omxz2, 3
PIANO TUNING, MINIMUM RANGE
POWER SWITCH, MAIN VOLUME, TUNE, TEMPO, MIDI TERMINALS (IN, OUT, THRU}, PEDAL IN,
LINE OUT (R/A+L, L), AUX IN (A/R+L, L), PHONES x 2, AC IN, INITIAL KEY
60 Wx 2
t4omx2, 6B5omx2
250 W, 160 W (NORTH AMERICA AND MEXICO}
AC120/220/240V 50/60 Hz 7
AGI20V 60 Hz (NORTH AMERICA AND MEXICO)
meee
| AC230V 50/60 Hz (NEW ZEALAND AND EUROPE EXCEPT FOR UNITED KINGDOM)
438.7 om x 102.4 em x 50.9 om (54-19/32" x 40-5/16" x 20- 0-1/82")
72.0 kg {158.7 Ibs.)
ACCESSORIES
AC CORD, STAND
* Specifications are subject ta change without notice for further improvement.
Technics

CONTENTS
M@ PART I (INTRODUCTION)
SAFETY PRECAUTION ............0202. cece eeeeee
HOW TO ASSEMBLE THE PIANO .........0..0c0eus
KEYBOARD RANGES .......2..2.00. cece eee eee eee
OPTIONS ished ie cnieese each tah cbahictbis ies weleaten
ARRANGEMENT OF CONTROL PANEL ............-
BASIC FUNCTIONS . 200... cece cece e cece cece cece
TERMINALS ... 00... .c cece cee cece cence cece ecenes
INITIAL SETTING 0.0.00 cece cece eetee cere seueeaees
PARTS LOCATION .. 0... cccccucecee ree enceneesees
DISASSEMBLY INSTRUCTIONS ..........0.-..00085
SYMPTOMS WHICH APPEAR TO BE SIGNS OF
TROUBLE Secos cv feted cde pwotinneGdad an oneweeees
ABOUT THE SELF-DIAGNOSTIC FUNCTION ...,.....
MIDI IMPLEMENTATION CHART ..............---..
PRECAUTIONS BEFORE SERVICING ......-...0008,
PART H (SCHEMATIC DIAGRAM)
BLOCK DIAGHAM 22264 ss0rdeedwccncetcnrnesitavade
MAIN & TONE GENERATOR
CIRCUIT BOARD ........ PUR Se EE ee:
MAIN & TONE GENERATOR CIRCUIT
DIAGRAM saci agar ie cctees pete 11-9
AC POWER SUPPLY, AMP & POWER
SUPPLY AND HEADPHONES
GICUIT BOARD: 12.50... cerca eaerteneres E-13
AC POWER SUPPLY, AMP & POWER
SUPPLY AND HEADPHONES
CIRCUIT DIAGRAM ..........5- ae ee eet U-17
CONTROL PANEL CIRCUIT DIAGRAM ...... IL-9
CONTROL PANEL CIRCUIT BOARD ........ I-21
-MANUAL KEYBOARD 1 AND 2
CIRCUIT cc oxnnived eaeuetitint vote eerses IP-24
JACK CIRCUIT .atixginesode catewes santas U-27
@ PART III (REPLACEMENT PARTS LIST)
REPLACEMENT PARTS LIST
(P.C.B. and Wiring Parts) ....-..--. eee ee eee eee HI-1
CABINET PARTS LOCATION .........-.-...--- 0065 I-5
REPLACEMENT PARTS LIST
(Cabinet and Chassis Parts} ......- 0... cae cece eae HI-7
PACKING .......-------e- Sad aleidialsied o avbeate enc ... HI-10
SAFETY
PRECAUTION
this
“satety
precaution”
is
for
the
U.S.A.
only)
e Safety Precaution
oaohon—
. Before servicing, unplug the power cord te prevent an electric shock.
. When replacing parts, use only the manufacturer's recommended components for safety.
. Check the condition of the power cord. Replace if wear or damage is evident.
. After servicing, be sure io restore the lead dress, insulation barriers, insulation papers, shields, etc.
. Before returning the serviced equipment to the customer, be sure to make the following insulation resistance
test to prevent the customer from being exposed to a shock hazard.
e insulation Resistance Test
1. Unplug the power cord and short the two prongs of the plug with a jumper wire.
2. Turn on the power switch.
3.
Measure the resistance value with an ohmmeter between the jumpered AC plug and each exposed metal cabinet part,
such as screw heads, connectors, control shafts, handle brackets, etc. Measurements should range from 4 MQ to.
infinity for all exposed parts.
Exposed
metal
part
a A
Ohmmeter
Resistance= 4MQ to oo

HOW TO ASSEMBLE THE PIANO
* To prevent the piano unit from falling off the stand, secure it firmly with the screws.
Assemble the side panels and the pedal box with
the 4 brass-colored screws.
Side panel
Pedal box
‘Screw (Brass-colored)
“Fig. 1]
Place the stand upright and mount the. speaker
box anto the L-shaped brackets with the 6 screws.
(Black screws for model SX-PX107, Brown screws
for model SX-PX107M)}
L-shaped brackeis
[Fig. 2]
[3] Place the piano unit on the stand and secure it ‘0
the stand. (Black screws for model SX-PX10!,
Brown screws for madel SX-PX107M)
Connect the pedal. box cord, speaker box cord and
power cord to their sockets located rear of the
piano unit as shown below.
Power cord Speaker box'cord -
Pedal box
cord
[Fig. 4]

KEYBOARD RANGES
8 va
a a
4 . = = Co as
= —— os
>... 1 i
+ Middle 1 |
' ' I ! i
= ! !
i] ‘
er om init EET Sheers u
—— : =
: comars i = 7
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= aris ; ' ' : '
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ee
:
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a | ot
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(AR) D¥7 G*i2 C817 FR 22 A* 26 ' Dfa G*36 aie Fae Ats0)
oot : ' ' ! '
CMs! FRO'AS 141 | D*19- ‘GPa! Jones Fig, (AS aa! | ‘D#a3 GP 4p!
'
1
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:
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1
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1
D*ss G*eo G65 F*70 Arr4! D*7g G¥aa
C8531 F¥sg Atego! Der 1G872! C877! Faz :Atee |
Aa 1 Ca: ' Gri Bas ; ‘O18! Far 1 A251 C2 ! Ea2 1 G36 | : B39: Daa: Fas | Aag:: 1 C52 iEs6 1Gs9 + Bes | | Dee | 1 Feo | A73: C76 | Eso | Gag | Bar
B3 De- Fa Ais Cis E20 Gis Ba? Bas F33 hy Ca Ess Gar Bor Da Fs? a Céa Eea Gn B75 D078 Fer Ass Cee
OPTIONS
[PRODUCTS FOR SX-PX107-———__
$Z-CP1 $Z-CP3
Bench . ~ Bench
(PRODUCTS FOR SX-PX107M™—
SZ-DC5 |
. Dust Cover,
$Z-CP3M
Bench

ARRANGEMENT OF CONTROL PANEL
ESCO OD
BASIC FUNCTIONS
@ DEMO
Automatic demonstration performances stored in the
‘piano’s memory introduce the various sounds. avail-
MAIN VOLUME
fe)
SOUND pre
OEGRAND OHARPS! © VIBES OSTAINGS OORGAN
ee ec
TRANSPOSE
DEMO MODE bow {
ay SET 3
3)
BRILLIANCE
MELLOW BRIGHT
° °
@ SEQUENCER
OTRACK1 ~OTRACK?
TOUCK SENSITIVITY
OLIGHT
ONORMAL ®
DIGITAL DIGITAL,
CELESTE REVERB
ROMO Ona, «= METRONOME
° STIAGEQ © OCONCERT OVOLUME OnEAvY
OGRANO OQUPRIGHT © ROCK OEPIANO! OE PIANO?
Bre he,e7s
able. Listen to all the demonstration tunes in order, or —
listen to the demo tune of a epecttic sound,
MODE SET, © INITIAL key .
Used when selecting functions to set or Adinial, in-
cluding type of piano tuning, minimum range, initial-
ization, plus .all settable MIDI functions. Also used
when erasing SEQUENCER tracks.
elf the INITIAL key is pressed while the MODE SET
button is depressed, the settings of the buttons, etc.
will return to the initialized settings made by the
manufacturer.
TRANSPOSE :
C is the standard setting, but you can raise or lower
the key of the entire instrument within a one-octave
range with these two ‘buttons, The buttons are also”
used for adjusting the volume ‘balance of mixed
sounds.
SOUND
Select from 10 different sounds for the piano. You
can mix sounds by selecting two simultaneously. All
sounds feature Touch Response.
Tune =
Display
Various information is shown on the display, includ-
ing SEQUENCER information (remaining memory
capacity, error indication) and MIDI information
(selected MIDI CHANNEL, PROGRAM CHANGE
number).
TEMPO
Use to adjust the.tempo and volume of the
metronome and the playback tempo of the SEQUEN-
CER.
BRILLIANCE
Select the brightness of.the sound from five settings.
The setting is memorized independently for each
sound.
DIGITAL CELESTE
Apply a celeste effect to give the sound greater
Ss depth. The petting is memorized independently for
each sound.
DIGITAL REVERB
Add a reverb effect to the sound. Choose one of four
different echo types. The setting is memorized inde-
pendently for each sound.
@ FAST
ee
( as OO OfRECORD) ea
METRONOME
You can play in time with a metronome sound. The
metronome volume and speed are adjustable, and
you can accent the metronome sound to match the
time signature of the music.
SEQUENCER
Record your performance and have it automatically
played back on the two-track sequencer. The memory
capacity is about 4000 notes.
TOUCH SENSITIVITY
Choose LIGHT, NORMAL or HEAVY keyboard touch
(Touch Response) to match your type of playing.
Sustain pedal
The sound is sustained when a key is released while
this pedal is depressed. The length of the sustain is
controlled by the degree to which the pedal is
depressed (four stages). For GRAND PIANO,
UPRIGHT PIANO and ROCK PIANO sounds, the
tones of the 17 rightmost keys are automatically sus-
tained.
® Sostenuto pedal
Sustain is added only to the notes played while the
pedal is depressed.
® Soft pedal
Press the pedal for softer, muted sound.
Se
Sustain pedal
Sostenuto pedal
Soft pedal’

TERMINALS
(On the back of piano)
mi Nn oe NO THRU PEDAL
5000 BQ e@
00 00
MIDI (Musical instrument.Digital Interface)
MIDI is the standard specification that enables connec-
tion to equipment such as synthesizers and personal
computers. Data transmission and reception are pos-
sible between the Technics Digital Ensemble and in-
struments provided with MIDI terminals.
LINE OUT (output level 1.5 Vrms, 600 Q)- of
By plugging into an external high-power amplifier, the
sound can be reproduced at a high volume. Or connect:
a tape recorder and use them as recording terminals...
To output monaural sound; connect the external equip-
ment to the R/R+L terminal. (Do not connect the L ter-
minal.)
IN: The terminal that receives data from external
equipment.
OUT: The terminal that transmits data from the
AUX IN (input level 0.5 Vrms, 6 kQ) piano to external equipment.
Other instruments such as a rhythm machine or sound THRU: The terminal that transfers data from the IN
module can be connected to the piano so that the terminal directly to other equipment.
sound is output from the piano. To receive monaural
sound, connect the other instrument to the R/R+L ter-
minal. (Do not connect the L terminal.)
eUse a 5-pin DIN cord (less than 15m long) for these
connections.
PHONES ( () ) x2
For silent practice headphones may be used. When
PEDAL IN plugged in, the speaker system is automatically
Connect the cord from the included stand to this ter- switched off, and sound is heard only through the
minal. ‘i headphones.
INITIAL SETTING
The initial setting function is used to return to the original factory settings, and to reset the customer settings
and misoperations. The selected sound and various. functions, MIDI settings and SEQUENCER contents are _initil-
alized with this operation.
MODE
INITIAL SETTING 1 ss While pressing the Press the
(_) MODE SET button.
Press the INITIAL key while the MODE SET button is
pressed. Or turn on the POWER switch while pressing
the INITIAL key.
INITIAL key.
INITIAL
PARTS LOCATION
Tone Generator P.C.B. Control Panel P.C.B.
Main P.C.B. Amp & Power Supply P.C.B.
Jack P.C.B. AC Power Supply P.C.B.
CPO ae ep i ary,
Speaker Speaker
6.5cm, 8Q 6.5cm, 8Q
Power switch
Headphones
P.C.B. (inside)
Power Indicator
Soft re — Pedal
Sostenuto Pedal
[Photo-1]
Speaker Speaker
140m, 6Q 14cm, 6Q
Pedal Box
Speaker Box
[Photo-2]

DISASSEMBLY INSTRUCTIONS
Removing the top cover (Fig. 5) [5] Removing the control panel ornamert
1. Remove the top cover holding screws (@ 4 pcs.). 1. Remove the control panel (see step [3]).
2. Slide the top-cover forward and lift up. 2. Remove the CP P.C.B. (see step [4]).
(As shown by the arrow.) 3. Release the control panel ornament holding daws.
[2] Removing the keyboard cover
1. Remove the top cover (see step [1]).
2. Close the keyboard cover completely so that the
gears at the rear of the keyboard cover become
free from the guide rails.
3. Lift the keyboard cover up.
[Fig. 5]
[3] Removing the control panel (Fig. 6)
1. Remove the keyboard cover (see step [2)).
2. Remove the contro! panel holding screws (@ 3
pcs.).
3..Remove the control pane! as shown in Figure 6.
[6] Removing the keyboard assembly
1. Remove the control panel (see step [8])..
2. Remove the keyboard ass’y holding screws lo-
cated on the bottom of the cabinet (® 10 pcs.).
[4] Removing the P.C.B.
1. Remove the control panel (see step [3}).
2. Remove the main volume knob.
3. Remove the CP P.C.B. mounting screws (@ 6 Keyboard Assembly
pes.).
wee volume knob
Hu \
if TAS
[Fig. 8]

Removing the speakers
1. Remove the speaker nets mounting screws (@ 4
pes. each).
2. Remove the 14cm speakers mounting screws (@
4 pcs. each).
eBe careful that the 14cm speakers does not fall
off, since it comes free of the speaker box.
Key(s)
Disassembly
1. Remove the keyboard assembly (see step [6]).
2. To release the key claw. ,
© Press the front of the key downward slightly.
@ Press the rear of the key forward gently.
3. To remove the key, lift as shown in Figure 10.
NOTE:
eThe key claw is easily broken. Do not apply undue
force. Should a key claw break, it can still be used;
however, a replacement is recommended.
elf a black key is to be replaced it is necessary to
remove both. adjacent white keys.
[Fig. 10]
Assembly
1. Insert the front part of the key into the chassis.
2. Insert the plate spring into the hammer notch as
shown in Figure 11.
3. While slowly lowering the key into the chassis,in-
sert the plate spring into the notch at the rear of
the key.
4. Carefully insert the key into the opening in the
chassis and slide the key towards the rear to lock
it in place.
Karate spring installtion
iQ)
[Fig. 11]

[9] Removing the printed circuit boards.
e Remove the top cover (see step [1]).
TENN P.C.B.
1. Disconnect the connectors. Exe P.c.B.
2. Remove the MAIN P.C.B. mounting screws (@ 2 1. Release the claws of the AC IN connector bracket.
pcs.).
3. Release the claws of the P.C.B. holders. HEP.C.B.
1. Remove the keyboard assembly (see step [6]).
Mell P.c.B. 2. Remove the headphone jack mounting nuts @ 2
1. Release the claws of the P.C.B. holders. pcs.).
3. Remove the HP P.C.B. mounting screw (@ 1
EEGHP.c.B. pcs.).
1. Disconnect the connectors.
2. Remove the AS P.C.B. mounting screws (@ 2
pcs.).
3. Release the claws of the P.C.B. holder.
Miter P.C.B.
1. Disconnect the connectors.
2. Remove the JACK P.C.B. mounting screws (@ 3
pcs.).
3. Remove the jack panel mounting screws (@ 2
pes.).
P.C.B.
P.C.B.
P.C.B.
Mice P.c.B.
SYMPTOMS
WHICH
APPEAR
TO
BE
SIGNS
OF
TROUBLE
Remedy
eNo sound is produced if the MAIN VOLUME is set to MIN.
Use the sliding control to set the volume to an appropriate level.
elf the MIDI LOCAL CONTROL is set to off, set it to on.
eThe metronome, SEQUENCER tempo, etc. are indicated on the
display. During normal performance, however, the display is off.
Phenomenon
No sound is produced when the key-
board is played.
Nothing is shown on the display.
m About the back-up memory
The
selected
sound
and
various
functions,
MIDI
while
pressing
the
MODE
SET
button,
press
the
settings
remain
in
the
memory
for
about
1
week
INITIAL
key
on
the
keyboard.
Or
you
can
turn
on
after
the
POWER
is
turned
off.
If
you
wish
to
return
the
POWER
while
pressing
the
INITIAL
key.
all
memories
and
settings
to
their initialized
status,

ABOUT THE SELF-DIAGNOSTIC FUNCTION
This model has a self-diagnostic function. When set to the self-diagnostic mode, the quality can be assessed when the
diagnostic procedures in the chart below are followed.
nee ae eee
1 MAIN | RAM (IC4), ROM (IC3) check 1. Connect the CHECKING DEVICE (refer to page I-12) to
CN7 on the MAIN PCB, and turn on the CHECKING
DEVICE switch.
2. Turn on the power switch.
When. the power switch is turned on, the LED of the CHECKING DEVICE flashes on and off. The first
4 flashes are for the RAM check, and the latter 4 flashes are for the ROM check. The flash number
corresponds to the RAM number and ROM number; since one RAM and one ROM are used in this
model, flash 1 of the first 4 flashes corresponds to the RAM (IC4) check, and flash 1 of the second 4
flashes corresponds to the ROM (IC3) check. If the part is defective, the flash time for that part be-
comes longer.
RAM ROM
2 3
e @
Examples
|
|
2
1. RAM OK, ROM OK e
| 2. RAM OK, ROM defective e eo. 8
3. RAM defective, ROM OK
pa | ---@---@ an
ae, e---] ---@ -
Note: == indicates long flash time. RAM (IC4) ROM (IC3)
Gate array (IC2) check While pressing two C keys simultaneously, turn on the
power switch.
WUT Ml MA
Monitor pins 46~48 (DL6~DL4) of IC2 on an oscilloscope,
and check whether incremental data (see figure) is output. rie dena:
OV
3 CP Gate array (IC1) check 1. Connect the CHECKING DEVICE to CN7 on the MAIN
PCB. (The Checking Device switch should be off.)
2. While pressing two D neve simultaneously, turn on the
power switch.
URAL As
D keys
When the power switch is turned on, the LED of the CHECKING DEVICE flashes. The LED flashes 4
times, the first flash corresponding to the IC1 check. If IC1 is defective, the first flash will be longer.
. IC1 OK —____
2. IC1 defective >
Se I ---®@
e
e e
Gate Array (1C1)