Maintenance-2225 Service
7.
Pull the AttenuatorITimebase circuit board
7.
Remove the Power Switch extension shaft by
straight back from the front of the instrument
disengaging from power switch and pulling it out
until the attenuator switches are clear of the
through the Front Panel.
Front-Panel circuit board. Then lift out the entire
assembly through the top of the instrument.
8.
Disconnect the following cables from the Front
Panel board (these cables also connect to the
To reinstall the
AttenuatorITimebase circuit board,
front edge of the Main circuit board):
J1, J2, J3,
perform the reverse of the preceding steps.
J4,
J5, and J6.
The Bottom Shield of the
AttenuatorlTimebase circuit
9.
board assembly can be removed by removing the two
screws and nuts located at the front edge of the
board. 10.
Front-Panel Circuit Board
11.
The Front-Panel circuit board can be removed and
reinstalled as follows:
Disconnect J7 from the Front Panel board (cable
also connects to the Attenuator).
Remove the five screws that secure the Front
Panel board to the front chassis, noting their
respective positions.
Withdraw the Front Panel circuit board from the
front chassis taking care not to lose the slider
switch covers.
Perform
the
A~~~~~~~~~~~~~~~~~~
circuit
~~~~d
TO reinstall the Front-Panel circuit board, perform the
Assembly removal procedure.
reverse of the preceding steps.
2.
Remove the knobs from the following control
Main Circuit Board
shafts by pulling them straight out from the front
panel:
All components on the Main circuit board are acces-
sible either directly or by removing either the crt,
a. INTENSITY. Power Transformer or the
AttenuatorlTimebase
circuit board assembly. Removal of the Main circuit
b. Channel 1 and Channel 2 POSITION. board is required only when it is necessary to replace
the circuit board with a new one.
c. TRACE SEP.
The Main circuit board and inner chassis can be
d. COARSE and
FINE Horizontal POSITION removed and reinstalled together as follows:
controls.
e. LEVEL.
WARNING
)
f.
HOLDOFF.
The crt anode lead and the output terminal to
the High-Voltage Multiplier will retain a high-
3. Unsolder both the resistor
(R382) to the EXT
voltage charge after the instrument is turned
INPUT center connector and the wire strap to the
off. To avoid electrical shock, ground the crt
EXT INPUT
OR Z
ground lug.
side of the anode lead to the main instrument
4.
Remove the FOCUS control shaft by pulling it
through the front panel.
5.
Unsolder the resistors and wire straps to the
CH 1 OR X and CH
2
OR
Y
input connectors.
6.
Unsolder the Trace Rotation wires (J987) from
the Front-Panel circuit board (note the connec-
tion locations and wire colors for reinstallation
reference).
chassis.
1. Remove the FOCUS conatrol shaft by pulling it
out through the front panel.
2.
Unsolder W893 from the Main board. The cable
is connected to the Focus pot located on the
rear of the inner chassis.
3. Unsolder W903 from the rear of the Mains Input
board.
REV
APR
1990
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by
ARTEK
MEDIA
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