Maintenance-2225 Service
1
4.
Disengage the following cables from their
respective wire-trap connectors located on the
AttenuatorITimebase board:
a.
J755,
four-wire cable located at rear right
corner of board.
b.
J90,
six-wire cable located at center rear
edge of board.
c.
J30,
four-wire cable located at the left hand
side of the CH
1
attenuator switch.
d.
J80,
four-wire cable located between the
CH
1
and CH
2
attenuator switches.
e.
J701,
six-wire cable located at front right
corner of board.
5.
Turn instrument upside down (bottom of Main
board facing up) with the rear of the instrument
facing you.
6.
Remove the two screws that secure the heatsink
for the vertical output transistors
((2256
and
Q257)
to the rear chassis.
7.
Remove the screw that secures the heatsink for
the power supply transistors
((2950, (2980, Q923
and
(2913)
to the rear chassis.
8.
With the instrument still upside down, rotate it so
that the front is facing you. Unsolder the wire
connected to the Probe Adjust terminal from the
Main board.
9.
Disconnect the following cables from their
respective wire-trap connectors located along
the front edge of the Main board:
J1, J2, J3, J4,
J5,
and
J6.
10.
Remove the three screws that secure the Main
board to the pillars of the
AttenuatorITimebase
assembly.
11.
Remove the four screws that secure the inner
chassis.
I
12.
Remove the grounding nut and screw that
secure the inner chassis to the Mains lnput
circuit board.
The screw and nut which secure the Mains
lnput circuit board to the chassis provide safe-
ty grounding and must be properly replaced
when reinstalling the Mains lnput circuit board
13.
Remove the two screws and nuts that secure the
Main board to the left hand chassis member.
14.
Remove the three screws and nuts that secure
the Main board to the right hand chassis
member.
15.
Lift out Main board and inner chassis.
To reinstall the Main circuit board, perform the
reverse of the preceding steps. When installing the
Main circuit board, ensure that the circuit board is in
the guides at the rear of the chassis.
REV
APR
1990
Scans
by
ARTEK
MEDLQ
=>
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