MES SQA-V Gold Service Manual page 16

and

Please note: DO NOT connect currently the
keypad

Please note: DO NOT bend the keypad during this
process otherwise electrical wires/connectors
will be damaged

Please note: The golden stripe on the cable
connector should face the rear panel (the fan
side)

Power 6. Power Supply Unit – PSU
Supply
ISSUE: The main switch is ON but the power
Unit (PSU)
indicator does not light up and the fan is not working.

Notes:
1. Turn off the
main On/Off

switch and
disconnect the

device from the
mains before
opening.

2. Refer to the
Appendix section
for instructions
How to check the input connector:
on how to
address power 
supply problems.



SQA-V
Service Manual Dec_2019
Insert the new keypad cable into the slit in the
front panel
Attach the keypad to its designated location on
the front panel by gradually removing the paper
while pressing it firmly into place from one side
to the other.
Plug the keypad connector to the J11 location on
the main board
Close the SQA-V using 4 screws on the rear
panel
Check the fuses in the fuse box located inside
inlet on the rear panel of the SQA-V.
Replace the fuses if they are burned out.
Reconnect the power cord and turn the unit
back on.
If the unit still does not work, check the
input/output voltage of PSU as instructed below.
Check the voltage in the input connector of the
main PSU using a multimeter
The measured voltage between black and red
wires should be about 220 Volt AC
If no voltage is evident, replace the power inlet
(see paragraph 8)
If voltage is being supplied to the input
connector, check the output connector.
16
Keypad cable slit
Attach the new keypad
Plug the keypad connector
and verify correct orientation
Check the fuses
Check the voltage in the
input connector