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82
~
0 0
0 0 0 0
0 0
0 0 0 0 0 0
0 0 0 0
0
0
0 0 0 0 0
0 0 0 0 0
0 0
0 0 0 0 0 0
0 0 0 0 0 0
452554
00000000
SLT coble terminator wi 11 plug into extender
card on center rows of pins on side opposite
jumpers.
813
Coble Row 8
Cord Row D
FIGURE 82. EXTENDER CARD WIRING: LS TEMPERATURE CHECK
Optimize LS Drive Currents (Shmoo)
For a triple-six supply, execute sequence A. For
a single +6-volt supply, execute sequence B.
Sequence A: To optimize the +6 TC and
+6
VAR
voltage, plot the +6 VAR versus the +6 TC while
running the worst case test program as follows:
1. . With all logic voltages at nominal and the
+6 TC at approximately 4. 5V, vary the +6 VAR
to
the low and high voltage failure points and record
these points on the plot.
2. Increase the +6 TC by
O.
5V and repeat
step 1. Continue to perform steps 1 and 2 until the
+6 TC can no longer be increased without a failure
occurring.
Resistor
0
0 0
0 0 0
0 0
0
0
0 0
452554
0000000
Remove all jumpers from extender cord and replace with
jumper from card row D07 to coble row D07 and resistor
assembly 461614 across coble row 807 to 808.
3, The optimum setting of the +6 VAR and +6
TC voltage is the center of the longest rectangle
that can be drawn inside the plotted curve. (The
sides of the rectangle should be parallel to the X
and Y axes of the plot. ) The minimum rectangle
must be equal to or greater than ±5% of the nominal
setting. The four corners of the rectangle are
checked during preventive maintenance.
Sequence B: To optimize the +6 VAR, plot the +6
VAR versus the +6 TC while running the worst case
test program as follows:
1.
Determine the upper and lower error-free
running limits for the
+6
VAR. The midpoint of
these limits is the operating point.
Service Checks, Adjllltment and Removal Procedure
(3/71)
93
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