Tektronix 453 - Page 78

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Set A TIME/DIV switch to .5 ms. Check
for about five complete cycles/10 divi-
sions
Set the A TIME/DIV switch to 5 ms and
the MAG switch to X 10. Check for
about five complete cycles/ 1 0 divisions
Yes
Set MAG switch to OFF, HORIZ DISPLAY
switch to A INTEN DURING B and the
A SWEEP MODE switch to B STARTS
AFTER DELAY TIME. Pull the DELA YEO
SWEEP knob' and set it to .5 ms. Check
for an intensified portion on the display
Yes
No
No
Check if A
VARIABLE TIME/DIV I No
control is set to CAL
Return A VARIABLE control to N
CAL and check for about five - - .! - 1
complete cycles/ 10 divisions I
Yes Yes :
Check
Horizontal
Amplifier circuit
Check B
unblanking gate at Pin I N
AS on B Sweep board (about 0.3 °
volts peak to peak)
Yes
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Check for a one-kilohertz square-
wave at the 1 kHz CAL connector
with test oscilloscope
Yes
Check A
Sweep Generalor circuit
and Horizontal Amplifier circuit
Check B
Sweep
Generator circuit
No
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Check combined unblanking
TP1047 on Z Axis board.
gate at
Waveform• No
should show an additional positive step
during B sweep time to intensify portion
of trace
Yes
Readjust INTENSITY control
fied
portion is visible
Yes
so intensi-
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_N2_1_ __ - - - - - -~e~k-Z A~A;;;;ITTi~; clr~Utt)
Rotate the DELAY-TIME MULTIPLIER dial I- ~t~n~f~~ ___ _
throughout its range portion does
Check B Sweep Generator (Delay-Pickoff Compara-
tor, Delay Multivibrator, B Sweep Reset Multivibra-
tor and B Sweep Gate stages)
Intensified I portion
moves along trace
not move
Set the HORIZ DISPLAY switch to DE- I No
LAYED SWEEP IBl and position the ris-
Check if B TIME/DIV
VARIABLE I No
control is set to CAL
ing portion of one of the square waves
to the left graticule line. Check for
about five complete cycles/ 10 divisions
Set the B SWEEP MODE switch to TRIG-
GERABLE AFTER DELAY TIME and set
the B SOURCE switch to INT, B COU-
PLING switch
to AC and adjust the B
LEVEL control for a stable display
Stable I display
Yes
Stable
display ~ I
- - - - - - - Check B Trigger Generator circuit
cannot
be obtained
Intensified
Return B TIME/DIV VARIABLE con- No
trol to CAL and check for about - - ,
five
complete cycles/ 10 divisions I
I
Yes I
Check B
Sweep Generator circuit
Set the HORIZ DISPLAY switch to A INTEN portion
DURING B and rotate the DELAY-TIME - - - - - - -d~;-.;;t- - -
MULTIPLIER dial throughout its range move
Check B Trigger Generator Cir-
cuit and Delay Pickoff Comparator
stage
Check
Calibrator
circuit
Apparent trouble may have been due to incorrect
Intensified portion 'jumps' between square waves in display control settings. For a trouble not covered by this
Fig. 4-3. Troubleshooting chart for Type 453.
chart, use the troubleshooting methods in steps
6-8 of the Troubleshooting Techniques
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