Alesis LQSQ User manual

1
ELECTRONIC KEYBOARD
SERVICE MANUAL
LQSQ

2
Contents
Panel descriptions--------------------------------------------------- 3
Rear panel----------------------------------------------------------------4
Layout & Connection--------------------------------------------------5
General Exploded Drawing and List---------------------------- 5
Circuit Boards--------------------------------------------------------- 6
Parts List----------------------------------------------------------------7
PCB Boards----------------------------------------------------------------12
Diagnosis----------------------------------------------------------------- 13
Frequently Asked Questions--------------------------------------- 13
Spare Parts List------------------------------------------------------ 14

3
Panel Descriptions
1. Power on/off: Press this button to turn the keyboard on or off.
2. Transpose: Press the transpose + or transpose - button to increase or decrease the pitch of the keyboard
by a half-step. Press the transpose + or transpose - buttons simultaneously to reset to the default value.
3. Rhythm Volume: Press the rhythm vol + or rhythm vol - button to increase or decrease accompaniment rhythm
volume. Press the rhythm vol + and rhythm vol - buttons simultaneously to reset to the default value.
4. Chord Volume: Press the Chord vol + or Chord vol - button to increase or decrease accompaniment chord
volume. Press the Chord vol + and Chord vol - buttons simultaneously to reset to the default value.
5. Master Volume: Press the Master vol + or Master vol - button to increase or decrease the overall volume
for the sounds and rhythms. Press the Master vol + and Master vol - buttons simultaneously to reset to the
default value.
6. Tempo: Press the Tempo + or Tempo - button to increase or decrease the speed of the rhythm and chord
accompaniment, demo song and/or metronome. Press the Tempo + and Tempo - buttons simultaneously to reset
to the default value.
7. Demo: Press this button to begin playback of the demonstration songs. Use the number buttons or the +
or -buttons to select another demonstration song. Press this button again to stop the playback.
8. One-key: Press this button to start the one-key function. This function lets you play along with the
demo songs by pressing any key to the rhythm of the song. Use the number buttons to select another demonstration
song.
9. LED Display: Shows the various keyboard functions and numerical values.
10. Program: Press this button to program a custom accompaniment rhythm.
11. Play: Press this button to playback a custom accompaniment rhythm or recorded song.
12. Record: Press this button to record a custom song.
13. Tone: Press this button and then use the number buttons or the +or -buttons to select a tone.
14. Rhythm: Press this button and then use the number buttons or the +or -buttons to select an accompaniment
rhythm.
15. Numbers: Use these buttons to select an instrument/rhythm/song, or tempo.

4
16. Sync: Press the sync button, and then play the keys in the lowest two octaves (corresponding to the
chords/notes). The play-along feature starts immediately when playing a key, instead of having to press
the starts/stop button to start it.
17. Start/Stop: Press to start or stop an accompaniment rhythm.
18. Fill In: Press this button to have a temporary rhythm play during the accompaniment rhythm.
19. Single Chord: Press this button to enable the fingered automatic chord feature. This feature will generate
chords for the accompaniment rhythms based on the keys you play that are the second lowest F# key or lower
on the keyboard. The available chords for this function are the described in operation > accompaniment rhythm.
Press this button again or press the chord clear button to disable the chord function.
20.
Fingered Chord: Press this button to enable the single automatic chord feature. This feature will generate
chords for the accompaniment rhythms based on the keys you play that are the second lowest F# key or lower
on the keyboard. The available chords for this function are the described in operation > accompaniment rhythm.
Press this button again or press the chord clear button to disable the chord function.
21.
Chord Clear: Press this button to turn the Single Chord/Fingered Chord feature off.
22.
Sustain: Press this button to activate a sustain effect which simulates a sustain pedal when playing
the keyboard. Press this button again to disable the sustain effect.
23.
Vibrato: Press this button to activate a pulsating change to the pitch when playing the keyboard. Press
this button again to disable the vibrato effect.
24. Dual: Press this button to layer two sounds together. The sound that you were using before pressing
the Dual button will be used for one part of the layer. To select the other sound for the layer, enter a
number for the sound or use the + and - buttons. Press the Dual button again to disable the dual-tone function.
25. Split: Press this button to split the keyboard into two zones. The sound that you were using before
pressing the split button will be applied to the left-hand side of the keyboard. To select a sound for the
right-hand side, enter a number for the sound or use the + and - buttons. Press the split button again to
disable the keyboard split.
26. Percussion: Press this button to play the built-in drum kit and percussion sounds using the keys. Press
this button again to disable this function.
27.
Intro/Ending: Press this button to play an intro and then start playback of an accompaniment rhythm.
Press this button while the accompaniment rhythm is playing to play an outro and then stop playback of an
accompaniment rhythm.
28.
Beat: Press this button to start the metronome. Press this button again to change the time signature
of this button or turn off the metronome.
Rear Panel
1. Mic: Connect the include microphone here to sing while playing
the keyboard.
2. Phones: Connect the included headphones here to hear the keyboard
and mute the internal speakers.
3. Power Input: Connect the included power adapter here.

5
A music stand
LED display module
Top Shell and Side cover
Keyboard conductive rubber
Keyboard PCB assembly
bottom shell and Battery spring
Cushion
Battery cover
PCB assembly
speaker
Function button
PC decoration
To power switch To left speaker
To Battery DC 9v
To right speaker
Left keyboard cable
Right keyboard cable
Layout & Connection
General Exploded Drawing and List
Switch module
Row of keys
Cover board

6
Product schematic

7
PCB Boards
Top Silkscreen
The top carbon film
Top line

8
Diagnosis
1.Digital display check
Press the ‘switch’ button, the digital display ‘120’, then press the digital keyboard
‘0--9’ one by one, the display should show the corresponding number.
2.Function key check
According to the panel, check each button function. If you cannot achieve panel function,
the key is failure.
3. Keyboard check
When you touch each tone key, the corresponding tone should be sent out.
4. Sound check
Press the ‘Demo’button to play music, the sound should have no obvious noise, and the
left and right sound should be balance.
Frequently Asked Questions
The serial
number
Problem
Possible Cause and Solution
1
LED -- Not lighting
Keyboard -- Not sounding
1. Check the power supply.
2. Check the DC jack, have it been connected
reliably? A poor contact would cause
unsuccessful power supply
2
LED -- Not lighting
Keyboard -- Sounding
Check the circuit of "LED display", whether
there is short circuit or short circuit.
3
LED -- Lighting
Keyboard -- Not sounding
1. Make sure the master volume knob is set
to an appropriate level.
2. Check whether any cable or headphone is
connected to the PHONES jack. When a set of
headphone is plugged into this jack, no
sound will output from the speaker.
4
One or more keys in the
keyboard without sound
1. There is some dust at the touch point of
the rubber to PCB carbon line.
2. Short circuit or open circuit of the PCB
line.

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5
One or more function
keys have no function
1. There is some dust in the conductive
rubber.
2."Function key" circuit exist short
circuit or open circuit
6
When using a mobile
phone, noise is
produced.
Using a mobile phone closely to the
instrument may produce interference. To
prevent this, turn off the mobile phone or
use it far away from the instrument.
Spare parts list
Serial
number
Parts No.
Material Name
Desription
Picture
Qty
1
203030026
Top cabinet
Has been printed
1
2
201020015
Left cover
Black HIPS 50*31.5*41mm,Painted
1
3
201020016
Rright cover
Black HIPS 50*31.5*41mm,Painted
1
4
206010002
Switch cap
Black Φ7 H=10mm
1
5
626000001
Speaker
4 ohm 5W 120*120mm
2
6
629010001
Function conductive
rubber
160 Function conductive rubber,8
pcs/set
1
7
642010013
Decorative cover
PC black Single-sided adhesive
size:78*40*1mm
1
8
202010001
Bottom cabinet
Black with two nut M5
1
9
209010011
Battery cover
Size:106*50*2mm, black
1
10
631040004
EVA cushion
840*7.0*3mm ,viscosity ,Black
1
11
631020004
Felt
845*6.5*1.4mm ,viscosity ,Black
1
12
205010001
White key
White ABS with four keys
5
13
205010006
White key
White ABS with three keys
5
14
205010012
White key
White ABS with one key
1

10
15
204010003
Black key
Black ABS with five keys
5
16
209010001
Bottom cover
HIPS Size: 278*68*2mm black
3
17
101080004
Keyboard PCBA
Spec:S-160B
1
18
101060003
Switch Assy
Spec:SW-160
1
19
101030014
Function board module
Function board 160A(including
the single-chip and LED module)
1
20
101210011
Single-chip
ARK-88
1
21
629010018
Keyboard conductive
rubber
ARK-160 -12 pins
4
22
629010019
Keyboard conductive
rubber
ARK-160 -13 pins
1
23
309070009
Positive spring
Φ0.8 nickel-plated
1
24
309070007
Negative spring
Φ0.8 nickel-plated
1
25
309070011
Positive-Negative
spring
Φ0.8 nickel-plated
1
26
309070008
Negative-Positive
spring
Φ0.8 nickel-plated
1
27
320010001
Music stand
Φ5mm Black surface of steel
wire . size:180*350mm
1
28
63802006701
Adaptor PSU
IN:100-240V AC 50/60Hz 0.5A,
OUT:9V DC
1
29
638020070
JP / US pin
adapter pin
1
30
638020069
UK pin
adapter pin
1
31
638020068
EU pin
adapter pin
1
32
639000023
Manual
Spec:Melody61 MKII
size:140*215mm,36 pages
1
33
639000134
Safety Manual
ALESIS size:140*215mm
1
34
641100001
Safety specification
label
Size:70x35 mm
1

11
35
644000001
A set of Polyfoam
6 parts
1
36
63700000101
Earphone with line
black L=1080mm With Earphone
1
37
102080001
Microphone
Microphone-160,L=1100mm
1
38
1060001
Stool
Black，Size:300*400mm
1
39
1060002
Stand
Type “X”
1
40
643010021
Polybag for the body
PE 1130*440*0.06mm printed
1
41
64900029901
Carton box
Size:1010*290*435(L*W*H）
1