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TC12 Installation, Commissioning & Maintenance Handbook
666/HE/43100/000
Page 60
Issue 10
Figure 17 - Master Switch Panel Fuses
MASTER SW
CABINET
RCD
FS1
5A
FRONT
13A SKT
FS2
5A
REAR
13A SKT
FS3
5A
MAINS
SKT B
FS4
5A
MAINS
SKT C
FS5
5A
MAINS
SKT D
FS6
5A
MAINS
SKT E
FS7
10A
WALL
MAP
PSU
Master Switch and RCD.
The diagram above shows the layout of the fuses on the Master Switch Panel
assembly. The position of the fuses FS1 to FS7 is shown along with the fuse value.
Fuse FS1 protects the front Mains sockets.
Fuse FS2 protects the rear Mains sockets.
Fuses FS3 to FS6 protect the Mains supply to up to four 19” racks.
Fuse FS7 protects the Wall Map power supply, if fitted.
2.4.10 PSU
The part number of the power supply fitted to the PSU board is 667/7/22631/000.
The Instation power supply should be replaced every
five years,
otherwise it may
become prone to overheating. There may be a label already on the PSU showing
the date it was shipped. This should be covered with a label showing the
date the
PSU is fitted
into the equipment. The replacement date is therefore
five years
after
the date on the label.
Power Supply Tests
If the power supply is suspected of being faulty, check the voltage outputs of the
power supply using a Multimeter.
Slide the PSU Board forward slightly to make access easier.
Wires connect from the power supply to terminal pins on the PCB. The terminal
pins are labelled TP4 to TP9 and each is also labelled with a voltage. Check these
as follows:
The voltage between TP7, GND and TP5, +5 V should be between 4.75 V and
5.25 V.