Pedestal Information; Power Transformer Information; Display Filter Removal, Cleaning, Installation - Tektronix 4010 Maintenance Manual

Servicing-4010 Maintenance
(2) Remove the four screws which hold the graticule
mask in place and remove the mask.
(3) Remove two screws from the top-rear of the
keyboard panel.
When re-assembling the power supply, refer to Table 3-1
for cable-connecting information.
TABLE 3-1
Power Supply Plug Reference
(4) Lift the keyboard out as far as the cables will
tJ~vP70-3
pin connector
3 brown on red wires
allow. Then turn the keyboard over. P71-5 pin connector
Pin l-orange on red wire
Pin 2-green on white wire
Pin 3-green on white wire
Pin 4-black on white wire
Pin 5-black on white wire
4 black on red wires
(5) The top surface of the circuit board can be
accessed by removing the six screws which hold the
keyboard assembly to the keyboard panel.
Key caps can be removed by pulling them directly away
from the keyboard.
Keys can be removed by unsoldering the two contacts
which hold them to the circuit board, and lifting them out
of their access slots.
Pedestal Information
Access. Remove the six screws from the front cover and
pull the cover off the front. Note that the line fuse is
located in a holder at the bottom of the cover.
Circuit Card Removal. All cards connected to the
mini-bus portion of the motherboard are held in by
friction. This does not include the first card on the viewer's
left (Deflection Amp and Storage Card). That card is
fastened to the adjacent heat sink (which is silk-screened
with the names of the card adjustments). To remove the
card and the attached heat sink, remove the three screws
which hold the heat sink in place. The screws are accessible
at the back on the outside of the pedestal, second row in
from the edge.
Power Supply Removal. Remove the cables which
connect to the power supply circuit board. Remove the
power plug which is connected to the transformer
assembly.
At the bottom-front within the pedestal, remove the two
screws which fasten the power supply side panels to the
bottom of the pedestal.
On the outside at the back of the pedestal, remove the
two screws on each side of the power supply heat sink.
Withdraw the power supply out the back.
3-4
P72-6 pin connector
-/~P73-3
pin connector
P74-1 pin connector
P75-10 pin connector
P76-3 pin connector
P77-3 pin connector
P78-3 pin connector
P79-3 pin connector
3 black on violet wires
Violet on white wire
8 black wires (1 wire is
white on black on some
instruments)
Pin 1-red wire
Pin 2-orange & green on
red wire
Pin 1-brown on red wire
Pin 2-green on white wire
Pin 3-orange on red wire
2 brown on violet wires
Pin 1-brown on violet wire
Pin 2-black on violet wire
Pin 3-red on white wire
Silicon Grease. Silicon grease is applied to both sides of
the mica insulators used with the following components:
0510, 0515, 0520, CR502, CR503. In addition, silicon
grease is applied between the heat sink and the mounting
plate on 075.
Power Transformer Information
The power transformer (located in the pedestal) can be
wired for use with 115 V or 230 V nominal line voltage,
and can be set for any of three ranges within the nominal
setting.
Instructions for connecting the transformer are con-
tained on the inside of the pedestal front panel and are not
repeated here. Note that the line fuse must also be changed
when shifting between 115 and 230 volt operation.
Instructions for fuse changing are contained on the panel
which covers the transformer assembly.
Display Filter Removal, Cleaning, Installation
Removal. Remove the CRT mask after removing the
four screws from its corners.
®