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2.3.2.2
Power Connector. The DC power connector (J2) is mounted opposite to J1 on the
component side of the PWB. Power connector J2 is a 4-pin AMP PIN 1-480426-0. The recom-
mended mating connector for P2 is AMP PIN 1-480424-0 that uses AMP pi ns PIN 60619-1. The
recommended wire size is No. 18 AWG. Figure 2-5 shows the pin-numbering sequence of J2. The
+5V and +12V power returns are tied together and connected to the chassis at the disk drive.
J2 CONN ECTOR
Figure 2-5. J2 Connector Outline
2.3.2.3
Frame Ground. The Model FDD100-5 Disk Drive must be grounded to the controller to
ensure proper operation and low noise susceptability. The AC ground or neutral wire should be con-
nected to the disk drive frame. A Fast-On tab is provided on the disk drive. This tab is an E.T.C. PIN
3431, and the mating connector is AMP PIN 60972-1. Means for AC coupling only between frame
and logic ground are provided on the main disk drive PWB; however, use of this feature may increase
noise susceptability in the disk drive. Modification is made by removing R53 (1M) from main disk
drive PWB.
2.3.3
TRANSMITTE R CHARACTE RISTICS
The Model FDD100-5 Disk Drive uses an SN7438 IC or equivalent to transmit all control and data
signals. This IC can sink 48 milliamperes at a low level of O.4-volt. Output signals are to be termin-
ated by a 132-0hm resistor network at the controller interface.
2.3.4
RECEIVER CHARACTERISTICS
The Model FDD 100-5 Disk Drive uses an SN7414 IC or equivalent to receive all transmitted signals
from the controller. The input of each receiver is terminated by a resistor network.
2-6
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