ALLEN & HEATH SQ User manual

SQ Service Guide
DISTRIBUTOR USE ONLY!

Warranty
The Allen & Heath warranty policy is as follows:
If the unit fails within 30 days of receipt by the distributor, then A&H will offer a parts for repair. If
the unit is DOA, then A&H will offer a replacement unit.
If the unit fails within 12 months of purchase by the end user, then A&H will offer parts free of
charge for repair by the distributor.
Component level repairs are not advised and are not supported on units within warranty.
For warranty enquiries, please contact [e-mail] with the serial number, date of
purchase and required part number.
For part orders for spares stock and out of warranty repairs please contact our spares administrator
[e-mail]

SQ Disassembly

Bottom Panel
Remove fixings from the bottom panel to access the inside of the unit.

Fans
Fold the bottom panel back and unclip the fan connections to remove the bottom panel

12v Fader Motor Supply
A separate power supply to the fader board is dedicated for the fader motors.
This 12 volt supply is regulated down to 5 volts on the fader board.

Fader PCB
Each fader has a dedicated wire form and can be removed individually, when replacing a fader, the PCB screws
must be removed.
When testing an issue with a fader, the wire form for the faulty fader can be swapped with an adjacent fader to
test if the PCB or motor is at fault – This does not require the fader to be removed from the unit.

Fader Wiring
When replacing a fader motor, the wire form should be reused from the old fader unless
a new wire form is requested.
Below is a reference for the wire connections when changing a fader motor.

Screen Connection
The TFT screen has two separate connections to the CPU on SQ, the thin cable (left) is for touch,
and the larger (right) cable is for display.
The back panel will need to be removed for access to the Screen, CPU PCB and Surface PCB.

Screen Mounting
The screen is mounted underneath the CPU PCB. When replacing a screen, the
mounting PCB and Bezel should be reused.
Please note: The adhesive pad protectors on the back of the screen should
not be removed. The screen should not be stuck to the mounting PCB.

LCD Mounting
There is a separate PCB for each bank of 4 LCD screens. If the first PCB in the chain
(left) has an issue, it may affected the others. For example, if there is a problem
with the back light on the first PCB, all the back lights may be affected.

LCD Bezel
The bezel surround of the LCD screen is made of harder material and can get caught on
the metal work when mounting. If it get’s caught it will cause pinching and
discolouration on the screen.
With the unit on its side, make sure the LCD is mounted correctly before fixing in place.

SQ Diagnostics

Power Distribution
PSU
Audio Input
Audio Output
Fader
Connector Headphone
Surface
Screen
Channel
Network
Soft Rotaries
(12v supply for
fader motors only)
CPU
SQ5 – AG10762 SQ6 - AG11096
SQ5 & SQ6 - AG10820
DSP - FX
SQ5 & SQ6 – AG10928
SQ5 & SQ6 - AG10938
SQ5 – AG10962 SQ6 – AG11091
SQ5 – AG10963 SQ6 – AG11092
SQ5 - AG10992 SQ6 – AG11094
SQ5 & SQ6 – AG10996
SQ5 – AG11018 SQ6 – AG11093
SQ5 & SQ6 – AG11069 SQ6 – AG11095
DC-DC
+12v
+3v3
+3v3
SQ5 & SQ6 – AG10964

Routing Overview
Audio Input
Audio Output
Fader
Connector Headphone
Surface
Screen
Channel
Network
Soft Rotaries
CPU
SQ5 – AG10762 SQ6 - AG11096
SQ5 & SQ6 - AG10820
DSP - FX
SQ5 & SQ6 – AG10928
SQ5 & SQ6 - AG10938
SQ5 – AG10962 SQ6 – AG11091
SQ5 – AG10963 SQ6 – AG11092
SQ5 - AG10992 SQ6 – AG11094
SQ5 & SQ6 – AG10996
SQ5 – AG11018 SQ6 – AG11093
SQ5 & SQ6 – AG11069 SQ6 – AG11095
HOST
DEVICE
TOUCH
= Audio
= Control
= USB
= Ethernet

4Ch LDC Screen Overview
Channel
SQ5 - AG10992 SQ6 – AG11094 SQ7 – AG11291
= Power
= Text Control
= Backlight Control
4Ch LCD
AE10814
4Ch LCD
AE10814 4Ch LCD
AE10814 4Ch LCD
AE10814
4Ch LCD
AE10814
4Ch LCD
AE10814
4Ch LCD
AE10814
4Ch LCD
AE10814
SQ5
SQ6
SQ7
Layer Side Mix Side

Diagnostics
A number of LEDs are placed on the main CPU, Fader board, DSP-FX
board and I/O cards to help monitor activity on these boards. This
includes LEDs for power rails, high speed link, and FPGA/DSP
programmed and active.
The Blue LED on the rear of the unit should be static.
Due to the presence of these LEDs, there are less needs for power
rail test points.
Also supplied are routing overviews for Power Distribution and
Control/Audio routing. Use these to identify an associated PCB
when a fault occurs.

CPU LEDs
12
3
5
4
6
7
1. +3V3 Power for TFT Screen. Yellow LED,
On Solid = Power Good
2. +2V5 rail Yellow LED.
On Solid = Power Good
3. +3V3 rail Yellow LED. (Indicator for +1V0,
+1V5, +1V8, +2V5, +3V3 and +12V rails)
On Solid = Power Good
4. +1V0 Error Red LED.
On Solid = CPU power issue.
5. +5V USB Yellow LED, Power for SQ-Drive
port.
On Solid = Power Good
6. Debug 0 = High Speed Link (HSL)
between CPU, DSP FX and IO Card.
Green = Good
Debug 1 = HSL Error. Illuminates for 5
second on power up.
Red = Error, Off = Good.
Debug 2 = FPGA Alive Blue LED, Displays
heart beat pattern.
7. ALIVE 1 = Core (Screen & Faders)
ALIVE 0 = USB
Yellow LED, Displays heart beat pattern.

DSP FX LEDs
1
2
3
4
1. +3V3 rail Green LED.
On Solid = Power Good
2. DSP Program indicator Yellow LED (U16A
& U16B)
On Solid = DSP Programmed
3. Prog OK = FPGA Programmed.
Blue LED displays heart beat pattern.
4. Link OK = HSL status Green LED.
On Solid = Link OK
ERROR = HSL Error indicator Red LED.
On solid = Error, Off = Good
Illuminates for 5 seconds during power up.

Fader Board LEDs
1
2
3
1. Active = Processor Active Yellow LED. Displays heart beat pattern. Two (2) present on SQ6. The
processor is powered by the +3V3 rail, if this LED is off, there is likely an issue with the +3V3 rail.
2. +3V3 rail Yellow LED. On Solid = Good (SQ5 Only)
3. +5V Fader Motor power good indicator Green LED. On Solid = Power Good