Tektronix 5110, Instruction Manual

Page: 44 / 128

Maintenance-5110
3. In Table 4-2, select the desired regulating range for
the nominal line voltage that will operate the oscilloscope.
For that voltage, note the recommended primary-tap pins
from Table 4-2 (note L, M, or H).
Table 4-2
REGULATING RANGE AND FUSE DATA
Primary Tap
Pins Selected
Regulating Range
120-V Nominal
(Brown Plug)
240-V Nominal
(Red Plug)
L (low)
100 V±10%
200 V ±10%
M (medium)
110 V±10%
220 V ±10%
H (high, typical setting) 120 V ±10% 240 V±10%
Line Fuse 1.6 A slow-blow 1 A slow-blow
4. In the instrument, select the proper line-voltage
selector block (see Fig. 4-1 for line-selector block
locations). Select the brown block for 120-volt operation
or select the red block for 240-volt operation. Install the
block on the row of primary-tap pins noted from Table 4-2
in the previous step (either L, M, or H).
Damage to tne instrument may result if the line­
selector block is used incorrectly (e.g., if the 120-volt
Fig. 4-1. Locations of the line-selector blocks on the LV Power
Supply circuit board.
block is used and the instrument is then connected
to 240-volt power).
5. Install the unused block on the unused line-selector
block pins (see Fig. 4-1 for pin location).
6. Remove the line fuse from the fuse holder and check
for the correct rating. Replace it with one having the
correct rating, if necessary. Refer to Table 4-2 for linefuse
information.
NOTE
An unused line fuse, intended for the line-voltage
source for which the oscilloscope was not set when
shipped from the factory, is clipped to the LVPower
Supply circuit board (see Fig. 4-1). Return the
resultant unused fuse to the unused fuse clips.
7. If appropriate, change the line-cord plug to match
the power source receptacle or use a suitable adapter.
8. Change the nominal line-voltage information
recorded on the rear panel. Use a non-abrasive eraser to
remove previous data, and mark on the new data with a
pencil.
9. Replace the bottom cabinet panel and apply power
to the oscilloscope.
INSTRUMENT CONVERSION
The oscilloscope can be separated into two parts; a
power supply/ampiifier module, and a display module.
These can be fastened together stacked or side by side;
this permits operation as a bench oscilloscope, or in a
standard 19-inch rack. The two modules can quickly be
converted from a bench model to a rackmount model, or
vice versa. Field conversion kits, including the necessary
parts, and instructions are available from Tektronix, Inc.
NOTE
Before attempting to operate the oscilloscope after
an instrument conversion, be sure the module wiring
interconnections are correct. If display modules
have been changed, check that the correct auxiliary
board is installed in the socket on the piug-in
interface board.
4-2