Maintenance— 2215A Service
NOTE
A t this point, any com ponent on the Front-Panel cir
cuit board m ay be accessed fo r rem oval and replace
ment. Skip to step 11 o f this procedure after
com ponent replacement. If circuit board replacem ent
is intended, continue with the remaining disassembly
steps.
8. Use a vacuum-desoldering tool to unsolder the 39
wire straps from the Main circuit board (connecting to the
Front-Panel circuit board).
9. Remove the Front-Panel circuit board from the instru
ment and clean the wire-strap holes on the Main circuit
board of any remaining solder.
NOTE
If a vacuum-desoldering tool is n ot available, lift each
strap out o f the M ain circuit board as the jo in t is
heated.
To reinstall the Front-Panel circuit board, perform the fol
lowing steps:
10. Insert and resolder the 39 wire straps on the Front-
Panel circuit board into their corresponding holes in the
Main circuit board (unsoldered in step 8).
11. Align the two chassis frame assemblies disassem
bled in step 7, making sure the POWER switch extension-
shaft button is properly placed in the front panel.
12. Reinstall four chassis-frame securing screws, two
screws securing the Main circuit board to the chassis frame,
and one screw securing the delay line to the chassis frame
(removed in step 6, parts b through e).
13. Push the Front-Panel circuit board forward and in
sert the control shafts, push buttons, and three-position
slide switches into their corresponding front-panel holes.
14. Reinstall three screws securing the Front-Panel cir
cuit board to the front-panel (removed in step 6, part a).
15. Resolder the single wire to the PROBE ADJUST
connector and the two wires to the VAR HOLDOFF control
(unsoldered in step 5).
16. Resolder the resistor to the EXT INPUT center con
nector and the wire strap to the EXT INPUT ground lug
(unsoldered in step 4).
17. Replace the front-panel knobs (removed in step 3).
18. Reinstall the Bottom shield, Attenuator, and Timing
circuit-board module (see the preceding reinstallation
procedure).
19. Reinstall the crt (see the "Cathode-Ray Tube"
reinstallation procedure).
Main Circuit Board
All components on the Main circuit board are accessible
either directly or by removing either the crt, the Bottom
shield, Attenuator, Timing circuit-board module, or the
Power-Supply shield. Removal of the Main circuit board is
required only when it is necessary to replace the board with
a new one.
To remove the Main circuit board, perform the following
steps:
1. Disconnect the three-wire B DELAY TIME POSITION
potentiometer connector (P4644) from the Main circuit
board (located in front of the Power-Supply shield).
2. Remove the Alt Sweep circuit board (see “Alt Sweep
Circuit Board” removal procedure).
3. Remove the Power-Supply shield and plastic power-
supply cover (see “Power-Supply Shield" removal
procedure).
4. Unsolder five wires from the Filter circuit board (lead
ing to the Main circuit board).
5. Remove connectors from the Attenuator and Timing
circuit boards, noting their locations for reinstallation
reference.
6. Remove the FOCUS control shaft assembly by pulling
it straight out from the front panel.
6-18
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