Operating instructions

A2-TRIGGER CIRCUIT BOARD . Toremove the circuit
board :
1 . Remove
3
inter-board multi-pin
connectors (see Fig . 4-
3
for identification) .
2 . Remove 2 screws from circuit board .
3 . Lift rear of circuit board away from frame and
slide
board to the rear until pushbutton switches are clear
of
the front panel .
4 . Note wire color on single-conductor shielded cables
(see Fig . 4-8) and connector to which each is attached .
5 .
Disconnect cables from back
of
circuit
board .
To replace the circuit board, reverse the order
of removal
.
Figure 4-8 . Coaxial end-lead connector assembly .
Maintenance-- 71387
A4-CLOCK CIRCUIT
BOARD . To remove the circuit
board :
1 . Note color of multi-pin connectors (see F ig

4-4 for
identification) and P numbers to which each attach .
Disconnect all multi-pin connectors from board .
2 . Remove 4 inter-board multi-pin connectors shown in
Figure 4-9 . See Figure 4-3 for identification .
3 . Remove 4 screws that secure circuit board as shown
in Figure 4-9 .
4 . Lift
rear of circuit board away from the frame and slide
board to the rear until pushbutton switches are
clear of
front panel .
5 . Disconnect coaxial end-lead connector from bottom of
board
(see
Fig . 4-8 for
identification) . Remove board from
instrument .
6 . Remove remaining 5 screws
to detach aluminium
shield .
7
. To replace circuit
board, reverse order of removal .
Al-INTERFACE CIRCUIT BOARD . To remove circuit
board :
1 . Remove
Trigger
and Clock circuit boards using
procedures
given previously .
2 . Set TIME/DIV knob to 2 ms position and VARIABLE
TIME/DIV
knob
to
expose the set screw .
3 . With hex-key wrench, loosen set screws in both knobs .
Remove knobs from shafts .
4 .
Note color of
multi-pin
connectors (see
Fig
4-4 for
identification) and P numbers to which each connect .
Disconnect
all multi-pin connectorsfrom
board .
5 . Remove 4 screws that secure gray plastic rear panel
to
instrument frame .
6 . Remove 6 screws that secure perimeter of board to
instrument frame
7 . Remove Interface circuit board through rear of
instrument .
To install the Interface circuit board :
1 . Guide TIME/DIV switch shaft through hole in
front-
panel .
2 . Install 6 screws that secure perimeter of board to
instrument frame .