Tektronix 2230 Service Manual

Maintenance—2230 Service
7. Remove the three securing screws from the Timing
circuit board (the screws are located at the right front
comer, left front side by the SEC/DIV switch shaft, and at
the right rear corner of the circuit board).
NOTE
The insulator on the left rear corner of the Timing
circuit board may be loose, if the insulator is loose,
remove and save it for the reinstallment of the Tim
ing circuit board.
8. Pull the Timing circuit board straight back from the
front of the instrument until the circuit board interconnect
ing pins are disengaged and the switch shaft is clear of
the Front-Panel circuit board.
9. If removal of Sweep Reference circuit board from
the assembly is desired, perform the "Sweep Reference
Circuit Board” removal procedure steps 3 through 7.
NOTE
Ensure that the Timing circuit board interconnecting
pins are aligned to the Front-Panel circuit board con
nectors before reinstallation.
To reinstall the Timing, Sweep Interface, and Sweep
Reference circuit boards assembly, perform the reverse of
the preceding steps.
SWEEP INTERFACE CIRCUIT BOARD SEPARATION.
To remove the Sweep Interface circuit board from the Tim
ing circuit board perform the following steps.
1. Use a vacuum-desoldering tool to unsolder the 22-
wire strap W1304 from the Sweep Interface to the Timing
circuit board.
2. Remove the Sweep Interface circuit board and clean
the wire-strap holes in the Timing circuit board.
To reinstall the Sweep Interface circuit board, perform
the reverse of the preceding steps.
Bottom Shield, Attenuator and Timing Circuit
Boards Assembly
The Bottom Shield, Attenuator, and Timing circuit
boards assembly can be removed and reinstalled as
follows:
1. Place the instrument upside down and remove the
three screws and one spacer post securing the Bottom
shield to the Main circuit board.
2. Perform steps 1 through 9 of the "Attenuator,
Channel 1 Logic and Channel 2 Logic Circuit Board"
removal procedure.
3. Perform steps 2 through 5 of the “Timing, Sweep
Interface, and Sweep Reference Circuit Boards" removal
procedure.
4. Pull the Bottom shield, along with the attached cir
cuit boards straight back from the front of the instrument
until the interconnecting pins on the circuit boards are
disengaged and the switch shafts are clear of the holes in
the Front-Panel circuit board; then lift out the entire
assembly through the top of the instrument.
5. If accessibility to the bottom of either the Attenuator
or the Timing circuit board is desired, refer to step 10 of
the “ Attenuator, and Channel 1 and Channel 2 Logic Cir
cuit Boards Assembly" removal procedure and to step 7
of the “Timing, Sweep Interface, and Sweep Reference
Circuit Boards Assembly” removal procedure.
To reinstall the Bottom Shield, Attenuator, and Timing
circuit boards assembly, perform the reverse of the
preceding steps.
Front-Panel Circuit Board
The Front-Panel circuit board can be removed and rein
stalled as follows:
1. Perform the "Storage Circuit Board in Servicing
Position" removal procedure.
2. Perform the "Support Chassis” removal procedure.
3. Perform the "Cathode-Ray Tube" removal
procedure.
4. Perform the "Bottom shield, Attenuator and Timing
Circuit Boards Assembly” removal procedure.
5. Remove the knobs from the following control shafts
by pulling them straight out from the front panel:
a. Channel 1 and Channel 2 POSITION.
b. A/B SWP SEP.
c. Horizontal POSITION.
d. B TRIGGER LEVEL.
6-44

Tektronix 2230 Specifications

General

Brand	Tektronix
Model	2230
Category	Test Equipment
Language	English