34
Maintenance
The Manufacturers or their agents overseas will provide repair for any unit developing a fault.
Where owner wish to undertake their own maintenance work, this should only be done by skilled
personnel in conjunction with the service manual which may be purchased directly from the
Manufacturers or their agents overseas.
Fuse
The correct fuse type is:
10 Amp 250V HBC time-lag, 5 x 20mm
Make sure that only fuses of the required rated current and specified type are used for
replacement. The use of makeshift fuses and the short-circuiting of fuse-holders is prohibited.
Important Note:
The main function of the fuse is to make the instrument safe and limit damage in
the event of failure of one of the switching devices. If the fuse fails it is therefore very likely that the
replacement will also blow, because the supply has developed a fault; in such circumstances the
instrument will need to be returned to the manufacturer for service.
If replacing the fuse is considered appropriate, proceed as follows:
1. Ensure that the instrument is disconnected from the AC supply.
2. Remove the two plastic push-rivets at each side edge of the top cover. Use the blade of a
small screwdriver to first ease out the rivet head and then fully remove the rivet body. Remove
the three rear panel screws securing the top cover; slide the cover back and lift off.
3. Remove the plastic push-rivets at each side of the fan mounting bracket. Turn the instrument
on to its side and remove the two screws on the base of the instrument (just beside the
ventilation holes) that secure the fan mounting bracket to the chassis. Unplug the fan cable
assembly from the Main PCB. Carefully remove the fan and mounting bracket, this may require
the connection assembly between the Interface PCB and control PCB to be removed
(CPX400SP only).
4. Undo the two nuts securing the orange and black wires (from the Power PCB) to the Main PCB
studs and disconnect the wires. Unplug the 9-way connector of the Control PCB to Power PCB
cable assembly from the Control PCB. Undo the two M4 nuts and bolts securing the top edge
of the Power PCB to the chassis side, taking care not to lose the spacers, then remove the two
M3 screws towards the centre of the PCB. Carefully lift the board assembly out, keeping the
board level so as to avoid bending the connecting pins.
5. The fuse is situated at the rear of the instrument, on the Main PCB assembly. Replace the fuse
with one of the correct type.
6. To reassemble the instrument, repeat the above procedure in the reverse order. Take great
care when inserting the power board assembly back into the instrument. There are two 8 way
headers on the Main board assembly next to the fuse that plug into complementary sockets on
the Power PCB assembly. To ensure that these align correctly, view the connection through
the aperture in the side of the chassis.
Cleaning
If the instrument requires cleaning use a cloth that is only lightly dampened with water or a mild
detergent.
WARNING! TO AVOID ELECTRIC SHOCK, OR DAMAGE TO THE INSTRUMENT, NEVER
ALLOW WATER TO GET INSIDE THE CASE. TO AVOID DAMAGE TO THE CASE NEVER
CLEAN WITH SOLVENTS.
Web link
For the latest version of this instruction manual, IVI driver and any applicable firmware updates go
to http://www.tti-test.com/go/csx
Summary of Contents for CPX400S
Page 1: ...CPX400S SA SP PowerFlex DC Power Supply ...
Page 28: ...27 Status Model ...
Page 36: ......
