Operating instructions

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Connect oscilloscope
to be used (7700,
7800 or 7900 series
Tektronix
oscilloscope) to correct
power source .
Turn power on . Set vertical
mode switch
to
left- Set horizontal mode
switch to B .
Set B trigger
source switch to left
vent .
Install 7887
in B horiz compartment
.
Install 7000-series
amplifier unit in the
left vert
compartment . Set 71387
triggering for P-P
AUTO, with AC
coupling from the internal
source . Set
7887 MAG
to IN and TIME/DIV
switch
tto
1 ms .
Trace displayed
Connect
the calibrator output
to the

Unstable display
amplifier input
. Set calibrator
and
amplifier controls
for a 2 division cnt
TRIG'D Indicator
display . Rotate 71387 trigger
LEVEL,
knob .

~ . . off
¬ TRIG'D indicator
on and display
I stable
Timing correct
Apply
time marks to the input
of the~ ; --
amplifier
unit and check timing at
several
i settings of
the 71387 TIME/DIV
switch
Check TIME/DIV
readout display .

Readout incorrect
Timing
and
readout display
correct
Rotate
ACQUIRE-STOP DELAY control
clockwise . The
intensified zone should
begin at left edge of
screen and move to
the right .
71387 n 7854 mainframe
B Horiz
compartment .
No stored
display
busy light remains
on (ADS doesn't
Display BOTH stored and
realtime . Set'

complete(
AQS
Clock/AQR mode
switch to ~-
internal , Press ADS .

,
If trouble
still persists after
completion of
tees in
chart, see steps 6
and 7
Troubleshooting
Techniques in
this
section .
No trace
i displayed
TRIG'D
Press oscilloscope o

ederandroute

indicator on
B intensity
control
Rotate
trigger
LEVEL
knob
TROUBLESHOOTING
CHART INSTRUCTIONS
:
1
Proceed down the left side of
chart until the instrument
does not perform as
indicated . Then proceed to the right
as the
symptom(s) indicates .
2 . Follow the path(s) of
symptoms until a shaded
block is reached . The
shaded block indicates the
circuit(s) that may cause instrument
malfunction . Refer
to
the
Theory of Operation
section for a detailed
discussion of the circuit(s)
.
NOTE
The upper case titles in
shaded blocks are the same
titles as used in the
Theory of Operation section
and on
tabs in the diagrams
section .
2788-55
G1
7 .
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