Time Electronics 1021 DC Current Source - Manual (Page 10)

10
1021 Technical Manual 10
6.
Maintenance and R epair
6.1. Maintenance
Dismantling the Instrument
Remove rubber protection boot and then removal of four 2.0mm CSK screws enables the
blue cover to be taken off which provides access to all parts of the instrument.
The range switch assembly can be removed by disconnecting the 9-pin connector and
removing the two front panel locating screws.
Fuse Replacement
The power supply and output fuses are mounted on the power supply printed circuit board
and are easily accessible on removing the instrument cover. Fuses are rated at F1A (F1),
and F250mA (F2), and have dimensions 20mm length by 5mm diameter. The fuses are
available from Time Electronics Ltd or your local supplier.
6.2. Repair
NOTE: No repair work should be undertaken by the customer while the instrument is
under warranty as such work may render the warranty invalid.
Some of the precision components used in this instrument are not readily available and
make repairs by the customer difficult if these components are damaged.
Overload conditions can cause a fuse failure which will be indicated by one of the following
conditions:
a) Instrument inoperative and battery level indicator at zero.
Possible cause –F1, F1A supply fuse blown.
b) Battery level indicator displaying but no output at the output terminals.
Possible cause – F2, F250mA output fuse blown.
Fuse Location
M
O
DUL
E
F2 F250mA
J2
BATTERY PACK
BATTERY PACK
F1 F1A