Remova I Of Covers; Transformer Voltage Selection; Fuses - Racal Instruments 9916 Workshop Manual

REMOVA L OF COVERS
WARNING: DANGEROUS AC VOLTAGES ARE EXPOSED WHEN COVERS ARE
REMOVED WITH AC SUPP LY CONNECTED.
(1 )
5.1 Set the POWER switch to 'off'l switch off the a. c. suppfy at the supply
point and unplug the power lead.
(2) Remove four screws from top and bottom covers.
(3) Remove the rubber pi ugs (located near to the rear end) from both side panels
of the instrument and slacken, by about two turns, the screws revea led.
(4) Grip the rear panel assembly and ease it back from the main case to the
maximum extent avai lable (about
5
mm).
(5) The rear edge of either cover con now be lifted and the cover withdrawn
outwards and rearwards.
(6) To replace the covers reverse the above procedure.
TRANSFORMER VOLTAGE SELECTION
5.2 Ensure the voltage range selected
is
suitable for the local supply. To check the
selection proceed os follows:
- FUSES
(1 )
(2)
(3)
(4)
(5)
(6 )
Unplug the power cable from the supply and remove the top cover (see
paragraph 5.1).
Refer to Fig.5.1 and note the diagram which corresponds to the focal
supp
I
y vol rage.
Connect the
link
and the wires from S52 to
the
transformer tappings os
shown
j~ the
appropriate diagram.
Set 552 to the correct hal f of the selected range.
Ensure that the rear panel label correctly indicates the voltage range
selected..
Replace the top cover.
~
5.3 Check that the power fuse on the rear panel is correctly rated for the supply vol tage
f
as fol lows. The fuse
is
a glass cartridge type, 5 x 20 mm.
9916 Vol.2
Supply Range
188V to 265V
94Vto132
. Fuse Rati ng
125rrA ant i-surge
250rrA anti -surge
Racol-Dcna Part No.
23-0031
23-0043
5-2