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X-Gate Decode-02 Active
B1M4J07 (MB071)
0. 2 us/cm; 2v/cm
Y-Gate Decode-02 Active
B1M6J07 (MB051)
0. 2 us/cm; 2v/cm
X-Write Driver-03 Active
Bl N4J05 (MB101)
0. 2 us/cm; 2v/cm
X-Reod Driver-02 Adive
B1N4G02 (MB141)
0.2 us/cm; 2v/cm
FIGURE 76.
MAIN STORAGE GATE AND DRIVER PATTERNS-
WAVEFORMS
method gives an approximate area of best operation,
but the final setting should be done by running a
shmoo and moving the strobes to improve operation.
The chart in Figure 78 shows the strobe for each
segment and bit. With the aid of the chart, adjust
the strobes for best operation,
M-9
Seg
Strobe A
Strobe B
A-B
Bits
9-17
Bits 0-8
Bits 27-35
Bits .18-26
C-0
Bits
0-8
Bits 9-17
Bits 18-26
Bits
27-3.~
FIGURE 78. STROBE FOR EACH SEGMENT AND BIT
Terminator Gate
Scope Picture When Rippling Memory
(M8091)
+60v
Turn On
Legend:
CD
t"ormol drive turn-off.
®
&
Q)
Weak drivers turn off.
©
Distorted pulse shapes can cause intermittent
problems that ore difficult to analyze.
FIGURE 77. MAIN STORAGE DRIVER FAILURES - WAVEFORMS
Turn Off
If
a bit is droppng when the XY voltage is
lowered, try moving the strobe associated with that
bit and segment ear lier,
This usually helps the
operation of that bit.
If
a bit is picking when the
XY voltage is raised, move the strobe associated
with that bit and segment later. The strobe turn-
off placement has little effect unless moved a great
distance (75-100 ns).
M9A Differences
Drive currents are to be measured on the wires to
the Cl board from pins listed in the following table.
Bits 0 thru 17
Bits 18 thru 35
X Read
B1M2G03
B1G6G03
X Write
B1M2J04
B1G6J04
Y Read
B1M2B12
B1G6B12
Y Write
B1M2D12
B1G6D12
Service Checks, Adjustment and Removal Procedure
(3/71)
89
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