Tektronix 2215A

Maintenance—2215A Service
To reinstall the Attenuator circuit board, perform the fol
lowing steps:
9. Insert the two VOLTS/DIV switch shafts and the Input
Coupling switch shafts into the front panel holes. Ensure
that the interconnecting pins are aligned with the Front-
Panel circuit board connectors and that the two resistors
(soldered to the bottom of the Attenuator circuit board) do
not touch the Front-Panel circuit board. Push the Attenuator
circuit board forward and, at the same time press the front
end of the board down slightly. Align the two Input Coupling
switch shafts with the front-panel holes by moving either the
Channel 1 or the Channel 2 Input Coupling switch knob.
10. Reinstall two screws and ground strap to the rear of
the Attenuator circuit board (removed in step 7).
11. Replace the top shield and reinstall the four screws
and ground strap from the rear of the attenuator board to
the top shield (removed in step 6).
12. Reconnect three connectors to the Attenuator circuit
board disconnected in step 5.
13. Place the instrument on its side and reinstall two
screws to the subpanel (removed in step 4).
14. Resolder the resistors to the CH 1 and CH 2 input
connectors (disconnected in step 3).
15. Reinstall the two VOLTS/DIV knobs at the positions
noted in step 2.
16. Rotate the two Variable control shafts fully clock
wise to their calibrated detent positions.
17. Reinstall the Variable knobs onto their shafts (with
lettering horizontal and right-side up) and tighten the set
screws.
Timing Circuit Board
To remove the Timing circuit board, perform the following
steps.
1. Use a 1/16-inch Hex-key wrench to loosen the set
screw of the SEC/DIV Variable knob.
2. Lock the A and B SEC/DIV knobs together and note
the position for reinstallation reference. Use a 1/4-inch nut
driver to remove the nut securing the B SEC/DIV knob; pull
off the knob and collet from the shaft assembly.
3. Use a 1/16-inch Hex-key wrench to loosen two set
screws securing the A SEC/DIV dial to the shaft assembly.
4. Remove the following connectors from the Timing cir
cuit board.
a. P9705, an eight-wire connector located at the rear of
the Timing circuit board.
b. P9700, a 10-wire connector located on the right edge
of the Timing circuit board.
5. Remove one screw at the rear of the Attenuator cir
cuit board (securing both the Attenuator and the Timing cir
cuit boards to the Bottom shield).
6. Remove the remaining three screws securing the Tim
ing circuit board to the Bottom shield.
7. Pull the Timing circuit board straight back from the
front of the instrument until the circuit board interconnecting
pins are disengaged and the switch shaft is clear of the
Front-Panel circuit board.
To reinstall the Timing circuit board, perform the follow
ing steps:
8. Insert the SEC/DIV switch shaft through the hole in
the Front-Panel circuit board, ensuring that the intercon
necting pins are aligned with the Front-Panel connectors.
Push the Timing circuit board forward into position.
9. Reinstall three screws securing the Timing circuit
board to the bottom shield (removed in step 6).
10. Reinstall the remaining screw at the rear of the
Attenuator circuit board securing both the Attenuator and
the Timing circuit boards to the bottom shield (removed in
step 5).
11. Reconnect two connectors to the Timing circuit
board (disconnected in step 4).
12. Reinstall the A SEC/DIV dial in the position noted in
step 3 and secure it with two set screws.
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