Maintenance—2465B/2467B Service
2.
Set the instrument back into its rear cover with
the CRT facing up. Using a small-bladed
screwdriver, gently pry up on the top cover trim
strip to release it from the top edge of the front
decorative trim
ring.
Remove the four screws from the top edge of
the front decorative trim
ring.
4.
Remove the four screws and the two plastic feet
from the bottom edge of the front decorative
trim
ring.
Using firm outward pressure, pull off the remain-
ing knobs. Note the locations of the knobs with
indicator bars for reference during reinstallation.
4.
On the rear of the assembly, remove the four
screws securing the black variable resistor
holder assembly.
Separate and slide out the above assembly with
attached variable-control shafts. Avoid stressing
the shafts to the side while sliding the assembly
out.
Using firm outward pressure, pull the knobs from
the four controls directly below the CRT (INTEN-
SITY, FOCUS, READOUT INTENSITY, and
SCALE ILLUM).
Slide off the front decorative trim
ring.
The clear
implosion shield is retained by the trim
ring.
Use
care to avoid dislodging the shield accidentally
from its recess in the CRT frame.
Disconnect the ribbon-cable connector (P652)
and the flex-circuit connector (P651) from the
front of the Control Board. Feed the flex-circuit
connector through the slot carefully while sliding
the front panel gently outward.
FRONT-PANEL REMOVAL. Use the following
procedure to further disassemble the Front-Panel circuit
board assembly.
1.
Separate the Front-Panel and variable resistor
holder assembly as described above (if not
already done).
2.
Lift up the circuit board carefully to avoid
dislodging any of the square push buttons from
their switches.
3. Lift off the black plastic switch guide and mount-
ing
ring.
8. Pull out the Front-Panel Circuit Board Assembly.
The following steps describe the further disassembly of
the Front-Panel Assembly once it is removed from the
instrument.
ASSEMBLY SEPARATION. Separation of the pot
holder module from the Front-Panel Board is accomplished
by the following steps:
To reassemble and reinstall the Front-Panel assembly,
perform the reverse of the preceding instructions. When
reinstalling the circuit board, align all push buttons and
LEDs with the black plastic switch guides before installing
and tightening the screws.
A1A11 and A1A12—Channel 1 and Channel 2
Attenuator Assembly Removal
Removal of either the Channel 1 or Channel 2 Attenua-
tor assembly is accomplished by the following steps:
Using a
1/16-inch
Allen wrench, loosen the set
screws in the CH 1 VOLTS/DIV VAR, CH 2
VOLTS/DIV VAR, and A and B SEC/DIV VAR
knobs and remove these three knobs from their
control shafts.
Using a
1/16-inch
Allen wrench, loosen the six
set screws in the CH 1 and CH 2 VOLTS/DIV
knobs, and the SEC/DIV knob. Remove these
three knobs from their control shafts.
1.
Remove the instrument Cabinet as described in
that procedure.
2.
Remove the Front-Panel assembly as described
in that procedure.
3. Remove the two screws holding the Attenuator
support bar and remove the bar.
6-29
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