Tektronix 485 User Manual

Maintenance—485/R485 Service
c. Remove Sweep board.
d. Remove Inverter board (see Inverter board removal
procedure).
e. Remove shield around the rear portion of the Timing
board.
f. Remove Timing wvitch knobs.
g. Remove the blue rear panel rim.
h. Remove the blue rear panel cover (10 screws).
i. Remove the fan blade.
j. Remove 8 screws holding the Timing board.
k. Tilt outside edge of the board up and carefully lift the
board out of the instrument.
I. To install, reverse the procedure.
TRANSFORMER BOARD REMOVAL.
a. Slide Inverter board out of the way (see Inverter
board removal procedure).
b. Remove the Sweep board.
c. Remove the Power board.
WARNING
A high voltage charge w ill remain on the Post
Accelerating Anode lead after the instrument has
been turned off. When disconnecting the Post
Accelerating lead, pull it out in a manner that it w ill
touch and discharge to the chassis ground im 
mediately after clearing the housing (take care to
avoid discharge to the nearby Vertical Deflection
connections). This procedure must be repeated every
time the Post Accelerating lead is removed. If it is
connected and removed without the instrument being
turned on, it will have accepted a charge from the
Anode Multiplier and w ill again be dangerous when
disconnected.
d. Disconnect the Post Accelerating Anode lead (top
side of instrument). Unclamp the female connection
housing for this lead.
e. Remove plastic shield on rear of the Horizontal
Amplifier board. Remove the two comb connectors from
under the shield and the one in front of the shield.
f. Remove the blue wrap around rear panel rim.
g. Remove the blue rear panel cover (10 screws).
h. Disconnect the three plugs with leads that are
connected to the CRT base socket at the rear of the
oscilloscope.
i. Unclamp the interconnecting lead to the Inverter
board.
j. Remove the Transformer board mounting screws (four
No. 4 screws). This does not include the two No. 6 screws
(transformer mounting).
k. Slide the Transformer board out.
I. To install the Transformer board, reverse this
procedure.
m. Connect all interconnecting leads.
®
REV. APR 1974
4-13

Tektronix 485 Specifications

General

Brand	Tektronix
Model	485
Category	Test Equipment
Language	English