Tektronix 5441 Instruction Manual page 97

B. REPLACEMENT 3. Replace the light shield.
1. Make sure the soft plastic crt faceplate supports are
in place, then insert the cA into the shield while feeding the
To replace the graticule lights, proceed as follows.
storage-element cable and the anode lead through the slot
and hole in the bottom and rear of the crt shield.
1. Remove the crt bezel assembly.
2. With the crt fully inserted and the shield hardware
loose, mount the bezel assembly into place and tighten the
bezel screws.
2. Pull out the light reflector assembly slightly.
NOTE
3. Replace the burned out light@).
If the crt support ring has come out of the crt shield,
place it over rear of crt and position inside crt shield
4. Replace the light reflector assembly back into its origi-
between crt and crt shield.
nal position.
3. Position the rear of the crt (socket end) so that there
5. Re-install the crt bezel assembly.
is no tilt of the faceplate in relation to the bezel assembly,
then tighten the positioning screws. Check that the four de-
flection crt neck-pin receptacles are centered in the neck
Power Transformer
shield cutout, the" tighten the clamp hardware.
Replace the power transformer only with a direct re-
placement Tektronix transformer. After the transformer has
4. Place the crt base socket onto the crt base pins. Re-
been replaced, check the power supply output voltages and
place the crt base cover on the rear panel. Connect the
the crt operation as outlined in the Operating Information
storage-element cable to the pin connectors on the Storage
section.
circuit board, and connect the deflection leads to the crt
neck pins. Reconnect the crt anode plug to the jack from the
high-voltage circuit board.
Fuses
Table 5-2 gives the rating, location, and function of the
fuses used in this instrument system.
5. Replacing the crt will require partial instrument adjust-
ment. Refer to the Adjustments information in this manual.
Bulbs
To replace the knob-skirt deflection-factor readout bulbs,
proceed as follows:
NOTE
To gain access to bulbs, it may be necessary to re-
move circuit boards and pushbutton switch extension
shafts. Extension shafts are removed and installed by
pulling straight off and pushing straight on.
1. Remove the light shield.
2. Unsolder the defective bulb, and install its
replacement.
Table 5-2
FUSES
REV MAY 1982
Circuit
Number
F300
F800
F410
Rating
120Vac-1.25A
Slow
240 V ac -0.7 A
Slow
0.25 A Fast
0.3 A Slow
Function
Line-Voltage
Input
+200 V
Unreg
supply
+38 V
Unreg
supply
Location
Display unit
rear panel
LV
Power
Supply board
HV
Power
Supply board