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4. Enable ROS retry by removing ground from
01C-E3C4Dll.
5. Using a 10 x 1 probe (with ground probe} on
the "CH 1 input, " scope either:
a. 01C-E2IAG05 if 5801515 card has five
modules.
b. 01C-E2IAG07 if 5801515 card has six
modules (EC 259398 or later).
6. Set up the scope to single sweep on a 0. 5-volt
negative shift. See following section for procedure.
7. Load and run ROS ripple; see "ROS Ripple
Test." Machines with EC 259860 or later must
ground 01C-E3C2Bl0 for this procedure only.
8. Ready the single sweep on the scope.
9. For a one-minute period after step 8 was
executed, determine whether or not the scope
triggered.
a.
If
the scope was not triggered, skip to
step 13.
b.
If
the scope was triggered, go to step 10.
10. Rotate the lower pot counterclockwi-se four
turns.
11. Ready the single sweep.
12. While running ROS ripple, determine whether
or not the scope still triggers during a one-minute
period after step 11.
a.
If
it does not, go to step 13.
b.
If
it does, repeat steps 10-12 until it no
longer does, then go to step 13.
13. Ready the single sweep.
14. Rotate the top pot clockwise until the scope
triggers occasionally during a one-minute interval
on a half-volt negative shift.
15. Set up the scope to single sweep on a 1. 0-
volt negative shift.
16. Ready the single sweep.
17.
If
the scope does not trigger for a one-minute
period at this setting, the ROS retry adjustment is
complete.
If
the scope triggers, rotate the top pot
1/4 turn counterclockwise. Repeat this step until
the following conditions are met:
a. The scope triggers occasionally on a 0. 5-
volt negative shift.
b. The scope does not trigger when set for a
one-volt negative shift.
Setting Up Single Sweep
1. Set the A and B time/div and delay time knob
to
O.
1 second scale.
2. Set the mode knob on CH 1 and the trigger knob
on CH 1 only.
3. Set A TRIGGERING as follows:
a. Source -- Internal
b. Coupling -- DC
c. Slope - Minus
96
(3/71)
Model 50 FFMM
d. Set LEVEL CONTROL to 0 position and
HF STAB all the way clockwise.
4. Set A SWEEP MODE to SINGLE SWEEP.
5. Set HORIZ DISPLAY to A and MAG to OFF.
6. Set the volts/div CH 1 knob to 50 MV and the
three-way switch below it to the ground position.
7. Rotate the position knob fully clockwise.
8. Press the reset pushbutton and make sure the
light comes on.
9. Rotate the position knob slowly counterclock-
wise until the reset light goes off.
10. The light is to be set to go off either 1 cm
below
th~
top horizontal graticule (0. 5-volt setting)
or 2 cm below the top horizontal graticule
(1.
0-
volt setting).
a. If the light went off above this point,
rotate the level control slightly counter-
clockwise and repeat steps 7-10 until the
scope fires at the right point.
Go
to step
11.
b.
If
the light went off below the reference
point, rotate the level control slightly
clockwise and repeat steps 7-10 until the
scope fires at the right point.
11. Move the three-way switch below the volts/
div CH 1 knob from the ground position to the DC
position.
12. Set the A sweep mode switch to the auto
trigger position.
13. Position the trace on the top horizontal grati-
cule.
14. Move the A sweep mode switch back to the
single sweep position.
15. Press the reset pushbutton and make sure the
light comes on.
I
ROS Waveforms
Figure 89 shows typical waveforms for normal ROS
operation.
These waveforms are not to be used as
reference for levels, transition times, or pulse
widths, but rather as a general indication of a nor-
mally functioning ROS unit.
ROS Parity Errors
To check ROS parity error circuits, ROS repeat on
one of three ROS words.
ROS Repeat
FD5
FD6
FD7
Error
0-30
31-55
56-89
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