Allen&Heath RPS14 - Manual (Page 5)

4 rps14_ap5717_1.doc
Servicing Notes – RPS14
User maintenance: There are no user serviceable parts inside the unit. It should be serviced by
suitably qualified personnel only.
Technology:
The RPS14 uses conventional thru-hole PCB technology.
Operation:
To test the Power Supply Unit, make sure it is connected as described in the
user guide. Check that the voltage setting marked on the rear panel is
correct for the local mains supply.
The RPS14 can be set to operate at a different mains voltage by performing
an internal wiring modification.
See document rps14_mains_voltage_setting.pdf for details.
Fault Finding
Should the Power Supply Unit fail to work correctly, check the following components first:
Mains Fuse
The AC mains fuse is located on the rear of the RPS14 unit next to the AC mains connector. In the event of a
mains surge or under-rated fuse value, the fuse will rupture. Switch off the power supply and remove the mains
lead plug from the “MAINS INPUT” socket on the rear of the unit. Check the fuse and replace if necessary.
TO AVOID THE RISK OF FIRE REPLACE FUSE WITH THE CORRECT TYPE ONLY, AS INDICATED
ON THE UNIT.
AC~ mains input voltage Fuse type
100V – 120V ± 10%
220V – 240V ± 10%
T 10A 250V 20mm
T 8A 250V 20mm
Internal DC Rail Fuses
Each DC supply rail (+17V, -17V, +12V and +48V) is protected by its own fuse. These fuses are mounted on
the main PCB. See the internal layout drawing for the locations, values and part numbers of these fuses. Check
these fuses to see if any have blown.
Cooling Fan
Check that the cooling fan is operating correctly, and that the ventilation holes are not blocked with dust or other
debris which could cause the unit to overheat and stop working. Note that if the RPS14 is suffering an
overheating problem, firstly the “HI TEMP” LED on the front panel will illuminate, then the unit will enter “protect”
mode and shut off the supply. Clear any dust from the ventilation holes using a vacuum cleaner and dry, lint
free cloth. Do not use liquid cleaners or compressed air to clean the unit. If the fan is not operating correctly or
if it becomes noisy it must be replaced.
Transformer
A non-functioning power supply unit may be caused by a failed transformer. Refer the transformer wiring
information in document rps14_transformer_2.pdf and check that the correct secondary voltages are reaching
the main PCB.