Circuit Board Removal And Replacement; Magnetic Latch Relays - Tektronix DC 5010 Anleitung

Circuit Board Removal and Replacement
Qualified service personnel will find the DC 501 0 instru-
ment cover and board removal quite simple using the follow-
ing procedure. Refer to Fig. 5-1 and the Parts Location
Grids in the pullout pages.
1. Remove the two side covers (four 114 turn fasteners).
2. Remove the top and back covers (may be easily re-
moved as a single unit).
Remove the top cover screws (2).
Remove the back cover 311 6" hex. bullet connec-
tors (2). Remove the screw that secures the GPlB
board to the back cover.
Carefully pull the covers up and back to remove.
3. To remove the Digital board and GPlB board (re-
moved as a single unit).
Repeat steps 1 and 2 above.
Remove the bottom cover screw that secures the
Digital board.
Disconnect the connector, P I 61 1 (J161 I), from
the Auxiliary board.
Carefully remove the Digital and interconnected
GPlB boards.
4. To remove the GPlB board from the Digital board.
a. Remove the screws (2) that secure the GPlB
board to the Digital board.
b. Separate the two boards taking care not to dam-
age the interconnector pins.
5. To remove the Analog board or the Auxiliary board
(these boards are interconnected and must be removed
together).
Repeat steps 1 and 2 above.
Remove the 9/16" nuts (2) from the front-panel
Channel A and B bnc input connectors.
Remove the bottom cover screws (2) securing
both the Analog and Auxiliary boards.
Disconnect the two connectors, P I 201 (J1201)
and P I 130 (J1130), from the Analog board.
,
-
Disconnect the connectors, P I 500 (J1500) and
P I 61 1 (J161 I), from the Auxiliary board.
Carefully pull the interconnected boards away
from the connector (front panel back) using a gen-
tle up and down rocking motion. Allow sufficient
clearance for the input connectors through the
front panel.
Gently pull the two boards apart, taking care not
to damage the interface connector pins. Often it
is easier to begin at one end of the board and
separate the connectors one at a time.
NOTE
With the Analog board out of the instrument, the
Channel
A
and B bnc connectors are subject to
damage. Care should be taken to prevent
breaking the bnc solder connection.
6. To remove the Display board. (Use the following to
access the seven-segment LEDS and annunciator LEDS)
procedure.
Repeat steps 1 through 5 above.
Disconnect the single-pin connector, P I 321.
Remove the screws (4) that secure the Display
board to the front panel (back).
Carefully remove the Display board, pulling up
and away from the bottom and lifting out.
replace the circuit boards, reverse the above
Magnetic Latch Relays
To prevent damage to these relays, do not remove them
from the Analog circuit board unless absolutely necessary. If
the relay contacts become noisy or the relay fails to operate,
remove the relay from the circuit board. The relays may be
individually removed. Remove the two relay hold down
screws located on the rear of the Analog board and carefully
remove the relay.
Clean the circuit board contacts with a small brush and
isopropyl alcohol. Do not use any solvent that may attack
polycarbonates such as hydrocarbon chlorides, ketones,
_
_
esters, etc. Do not use a cotton swab as small cotton fila-
ments may remain on the contact area.