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punching the desired pattern. Form the punched
tape into a loop and place on the read head.
2. Tie D1D14F and D1D14G to ground (system dia-
gram 01.80.30.1). The eight input AND will
now be satisfied when reading a IIG II character.
(Tape channels 1, 2, 3, 6, and 7; and channels
4 and 5 tied to ground). The tape pattern with
alternate IIG II and IIELII punches is used to obtain
a data signal every other character.
3. Set up a program loop to read tape as follows:
INSERT; Type 3700501 00300, 4900000.
RELEASE; START; The reader should now be run-
ning the loop of tape.
4. Set scope trigger mode to external minus.
5. Sync scope on lIanded
ll
output at D1D14E on
01.80.30.1.
6. Scope D 1 D 14E and p lace the center of the -S
waveform in the center of the scope face. The
-$
lIanded
ll
output must be at least 2 milliseconds
in duration. Failure to meet this requirement
ind icates an improperly a I igned read mask.
7. A time/div. setting of approximately 509 sec/div.
will spread the -S output waveform across the
scope face.
8. Scope the sync diode output at A4A06C on
02.83.50.1.
(a) Set the timing lamp potentiometer for lOv
across the lamp.
(b) Adjust the timing disk diode potentiometer for
a negative peak of -10v on the timing signal
(adjust the timing lamp if the potentiometer
I imit is reached).
(c) Loosen the two lamp assembly holding screws
and adjust the assembly for a maximum neg-
ative peak. Make sure that the top of the
timing lamp is not touching the drive shaft.
(d) Re-adjust the timing disk diode potentiometer
to set the negative peak to - 12v on the
timing signal (just in saturation).
9. Scope the type sync output pulse at A4A06A and
adjust the lamp assembly so that the fall of the
sync pulse (+S to -S) occurs in the center of the
lIanded
li
output waveform within 0.5 milliseconds
(Center of scope face due to Step 6). Scope
A4A06A and A4A06C alternately to maintain
the negative peak of the diode at -12v while
positioning the sync. The negative peak may be
re-adjusted to -12 with the timing diode potenti-
ometer to facilitate this adjustment. See Figure 4.
3. 13
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