Farnell E30 - Maintenance

shunt R10 in the O-15V mode, increasing the bias on VT4 base and
allowing the voltage across Rl6, (and therefore the current through
it) to rise to a higher value before vT4 is turned on.
Metering
A one milli amp f.s.d. meter is used to monitor the output voltage or
current. SW3 in the volts position connects the meter in series
with Rl3 and T5, (between positive and negative output terminals).
T5 is set to give f.s.d. on the meter at 3O volts. With SW3 in the
current position the meter (with T4 in series) senses the voltage
across Rl6. T4 is set to give f.s.d. on the meter with an output
current of 1 amp on model E3O/l and 2 amps on mode ls E30/2 and ET30/2.
6
Guarantee
The
equipment
supplied
by
Farnell
Instruments
Ltd., is
guar
an
teed
against
defective
material
and
faulty
manufacture
for
a
period
of
twelve
months from
the
date
of
despatch.
In
case of
material
or
Components
employed
in
the
equipment but
not
manufactured
by
us,
we
allow the
customer
the
period of
any
guarantee
extended
to
us.
The
equipment
has
been
carefully
inspected
and
submitted
to
compre
hensive
tests
at
the
factory
prior to
despatch.
If,
Within
the
quaran
tee
period, any
defect
is
discovered
in
the
equipment in
res
pect of
material
or
wOrkmanship and
reasonably
within
our
control,
we
undertake
to
make
good
the
defect
at
our
own
expense
subject
to
our standard conditions of sale. In exceptional circumstances and
at the discretion of the Service Manager, a charge for labour and
Our responsibility is in all cases limited to the cost of making
good the defect in the equipment itself, The guarantee does not
extend to third parties , nor does it apply to defects caused by ab
normal conditions of working, accident, misuse, neglect or wear and
Maintenance
MAINTENANCE
In the event of difficulty, or apparent circuit malfunction, it is
advisable to telephone (or telex) the Service Department or your
local sales Engineer or Agent (if overseas) for advice before attemp
ting repairS.
For repairs it is recommended that the complete unit be returned to:
The Service Department,
Farnell Instruments Ltd. ,
Sandbeck Way,
Wetherby, Yorkshire.
LS22 4DH
Tel: 0937 63541 Telex: 557294
London 0ffice,
Farnell Instruments Ltd.,
2 Orley Court,
Greenford Road,
HARROW, Middlesex.
HAl 3QD.
Tel: Ol-864 7433 and 7434
Please
ensure
adequate
care
is
taken
with
packing
and
arrange
insu
rance
cover
against
transit
damage
or
loss.
7
carriage costs incurred may be made.
tear.