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Maintenance-2336
Service
4. Gently pry up on the rear of the Vert Preamp1L.V.
2. Remove six Phillips-head screws retaining the Sweep/
Power Supply circuit board until the top edge-connector
Horiz Amp/Opt circuit board.
receptacle of J808 disengages from P808 pins on the
Trigger circuit board. Then gently pull the Trigger circuit
board away from the instrument until the bottom edge-
3. Gently pull the circuit board away from the instru-
connector pins of P840, on the Sweep/Horiz Amp/Opt
ment until connectors J871 and J876 (from the A and B
circuit board, disengage from J840.
Timing Switch circuit boards) are disengaged.
5. Remove the Trigger circuit board from the instru-
To reinstall the Sweep/Horiz Amp/Opt circuit board:
ment, taking care not to damage the COUPLING and
SOURCE switch control levers and the pins of P808 and
4. Position the board into place, aligning J871 and J876
P840.
with pins P871 and P876 on the A and B Timing Switch
circuit boards.
To reinstall the Trigger circuit board:
5. Press gently on the Sweep/Horiz Amp/Opt circuit
6. Position
the
board
into
place,
inserting the
board until P871 and P876 are fully engaged with J871 and
COUPLING
and
SOURCE
switch
levers
into their
J876.
respective slots in the front panel and aligning the pins
of P808 with J808 and the pins of P840 with 3840.
6. Reinstall six Phillips-head screws (removed in step 2).
7. Gently press J840 (on the Trigger board) onto the
pins of P840 (on the SweepIHoriz Amp/Opt board); then
7. Reconnect the four cables and connectors that were
press J808 (on the Vert Preamp1L.V. Power Supply board)
disconnected in step 1.
onto the pins of P808 (on the Trigger board).
8. Reinstall four
Phillips-head screws
(removed in
step 3).
Timing Switch Assembly
The Timing Switch assembly i s a unit consisting of the
A and B Timing switches, the VAR potentiometer, the A
9. Tighten nine screws on the Vert Preamp1L.V. Power
~~~i~~ switch circuit board ( ~ 1 7 ) ~
and the
T~~~~~
Supply circuit board (loosened in step
2).
Switch circuit board (A1 6). Replacing a complete Timing
Switch assembly with a new or rebuilt unit is the recom-
mended procedure. However, should it become necessary
lo.
Reconnect the five cables and connectors that were
t o disassemble and repair the assembly, replacement parts
disconnected in step 1.
(as well a s complete replacement units) can be ordered
from your local Tektronix Field Office or representative.
A24-Sweep/Horiz Amp/Opt Circuit Board
Removal and reinstallation of the Sweep/Horiz Amp/
Opt circuit board i s accomplished by the following steps:
1. Place the instrument on its side so that the Sweep/
Horiz AmpIOpt circuit board is accessible and disconnect
the following cables and connectors from the board:
a. P842 (from the Trigger circuit board).
b. P745 (from the Vert Out/H.V. Power Supply circuit
board).
c. P750 (from the B DELAY TIME POSITION control).
d. P751 (the Delta Time Interconnect cable).
The following procedure not only describes removal
and replacement of the Timing Switch assembly a s a
complete unit, but also explains how to disassemble and
reassemble the unit to facilitate repair and cleaning. Both
Figure 6-4 and the exploded view drawings in the "Replace-
able Mechanical Parts" list (Section 10) are useful in
performing switch disassembly and reassembly.
It is recommended that this procedure be read com-
pletely before starting any disassembly.
1. Remove the Vert Preamp1L.V. Power Supply circuit
board using the procedure previously described in this
part of the manual.
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Troubleshooting
