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19.1
GENERAL
19.1 .1
Purpose
The tape drive (727) tester (TDT) is designed to test mechanical and electrical
functions of the Type 727 tape drive.
and going to the drive.
connector.
19.1 .2
Description
The TDT is about 2- x l T 6T f x 4 f (high) and is mounted on casters.
one pluggable unit, an attached 121 signal cable terminated by a summary punch
connector, a manual control plug, a power supply, a switch panel, and other asso
ciated circuitry.
The TDT is supplied with a 12T power cable.
19.1.3
Power Supply
Power for the TDT is supplied through a four-prong three-phase line cord con
nector. The AC input requirements are 60 cycle, 3 phase, 208 volts ± 10%, 15 amps.
Sequencing for the phases is as follows:
Phase 1 (power connector pin 1) becom es positive maximum before.
Phase 2 (power connector pin 2) becom es positive maximum before.
Phase 3 (power connector pin 3) becom es positive maximum.
When turning on the AC, wait 30 seconds to allow filaments to heat before turn
ing on the DC.
The DC switches may be turned on in any order as they are in series
on the AC side of the power supply; all the DC com es up at the same time.
1 9 .1 .4
Power Arrangements
There are three methods of connecting the power when using the TDT (Figure 28):
1.
The normal method.
drive,
2.
The TDT supplies its own power but the control unit supplies the power for
the drive.
3.
The control unit supplies power for both the drive and the TDT.
19.2
PURPOSE OF SWITCHES AND HUBS
Refer to Figure 29.
19.2 .1
Switches
Address Select.
This switch has 11 positions (0 to 9), corresponding to the dial
switch on the tape drive unit, and an OFF position. If the tape drive address selector
switch is set to the same address as the TDT address switch, it is selected by the TDT
and the select light is turned on. This permits testing of all select lines to the tape drive.
19.0
727 TAPE DRIVE TESTER
The TDT tests all of the signals coming from
It supplies power to the drive through the normal power
The TDT supplies power for both itself and the tape
79
It contains
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