Tektronix 2230 Service Manual

Maintenance—2230 Service
11. Pull the Attenuator, Channel 1 Logic and Channel 2
Logic circuit boards Assembly straight back from the front
of the instrument until the circuit boards interconnecting
pins are disengaged and the switch shafts are clear of
both the Front-Panel circuit board and the two Input Cou
pling switch shafts (located between the front panel and
the subpanel). Then lift out the entire assembly through
the top of the instrument.
12. If removal of Channel 1 Logic and Channel 2 Logic
circuit boards from the assembly is desired, perform the
"Channel 1 Logic and Channel 2 Logic Circuit Boards”
removal procedure steps 6 through 8.
NOTE
When reinstalling the Attenuator, Channel 1 and
Channel 2 Logic circuit boards Assembly, ensure
that the interconnecting pins are aligned with the
Front-Panel circuit board, connectors and that the
two resistors (soldered to the bottom o f the Attenua
tor circuit board) are not touching the Front-Panel
circuit board. Push the Attenuator circuit board for
ward 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.
To reinstall the Attenuator, Channel 1 and Channel 2
Logic circuit boards assembly, perform the reverse of the
preceding steps.
Sweep Reference Circuit Board
The Sweep Reference circuit board can be removed
and reinstalled as follows:
1. Perform the "Storage Circuit Board in Servicing
Position” removal procedure.
2. Disconnect P9410, an seven-wire connector located
behind the SEC/DIV Variable control on the Sweep Refer
ence circuit board.
3. Disconnect P5201, a three-wire connector located
on the right side of the Sweep Reference circuit board.
4. Unsolder the two resistors from the Timing Circuit
board on the right side of the SEC/DIV Variable control.
5. Remove the shaft extension by loosening the
setscrew with a 0.50-hex wrench.
6. Remove the SEC/DIV variable control nut with a
9/16 inch open-end wrench.
7. Remove the Sweep Reference circuit board.
To reinstall the Sweep Reference circuit board, perform
the reverse of the preceding steps.
Timing, Sweep Interface, and Sweep Reference
Circuit Boards Assembly
The Timing, Sweep Interface, and Sweep Reference cir
cuit boards assembly can be removed and reinstalled as
follows:
1. Perform the “ Storage Circuit Board in Servicing
Position” removal procedure.
2. Use a 1/16-inch hex wrench to loosen the set screw
of the SEC/DIV Variable knob. Remove the SEC/DIV Vari
able knob.
3. Set both A and B SEC/DIV knobs to the EXT CLK
position. Use a 1/16-inch hex wrench to loosen the two
set screws that secure the A and B SEC/DIV knob; pull off
the knob from the shaft assembly.
4. Use a 1/16-inch hex wrench to loosen two set
screws securing the A SEC/DIV dial to the shaft assembly.
Remove the dial from the shaft.
5. Disconnect the following connectors from the
assembly, noting their locations for reinstallation reference:
a. P9700, a 10-wire connector located on the right
edge of the Timing circuit board.
b. P9705, an eight-wire connector located at the
rear of the Timing circuit board.
c. P6421, an five-wire connector located on the
Sweep Interface circuit board.
d. P9410, an seven-wire connector located behind
the SEC/DIV Variable control on the Sweep Reference
circuit board.
6. Remove the screw located at the right rear of the
Attenuator circuit board (securing both the Attenuator and
the Timing circuit boards to the Bottom shield).
6-43

Tektronix 2230 Specifications

General

Brand	Tektronix
Model	2230
Category	Test Equipment
Language	English