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Side
Side "A"
Pins 65 and
66
Bump
Lines
P:ns 67-130
I
Pins 1-64
~
A
Y
~es
130
67 66
65 64
M9 Seg "A"
M9 Seg"B"
M9
Seg "D"
M9 Seg "C"
Side "C"
I
and
3
Sense Lines
6
}
Pins 6-69
X
Drive Lines
72
and 74 Sense
75 and 77 Sense Lines
}
Pins
80-
143
X Drive lines
143
146 and 148 Sense
149 and 151 Sense
154
l
Pins 154-217
( X Drive lines
217
J
220 and 222 Sense Lines
223 and 225 Sense
228
} Pins 228-291
X Drive Lines
291
294 and 296 Sense Lines
FIGURE
60.
PHYSICAL LAYOUT OF M9/M9A PLANES
n
v
I/
1
j
'V
rs:
] [
l!I........
.--
"'V
FIGURE 61. X DRIVE CURRENT
Y Drive Current
An example of good Y current is shown in Figure 62.
The read and write pulses have about the same dura-
tion. Read will have a larger stagger between the
terminator gate turn-on and current turn-on.
FIGURE 62. Y DRIVE CURRENT
Shorted X Drive Line
Figure 63 is a current indication of two drive lines
shorted together.
In
Figures 63 and 64, where all
of storage is cycled, the trace will be very light.
These traces were taken while cycling 1/4 of storage.
S~rt
1
t...
.-
_/j_
[)_
_1
'
r
~
.....
~
~
:v~
FIGURE 63. SHORTED X DRIVE LINE
Open X Drive Line
Figure 64 is a current indication of an open drive
line. To locate a shorted or open drive line on the
array, loop on the failing address. Using a voltage
probe, lightly run the tip down the drive lines on the
array. Approximately a +60-volt level will show on
all the unselected drive lines. When the selected
drive line is reached, a voltage drop indication
occurs. With a short, the voltage indication looks
Service Checks, Adjustment
and
Removal Procedure
(3/71)
85
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