19.0
727 TAPE DRIVE TESTER
19.1
GENERAL
1 9 .1 .1
Purpose
The tape drive (727) tester (TDT) is designed to test mechanical and electrical
functions of the Type 727 tape drive. The TDT tests all of the signals coming from
and going to the drive. It supplies power to the drive through the normal power
connector.
1 9 .1 .2
Description
The TDT is about 2- x l T6Tf x 4 f (high) and is mounted on casters. It contains
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.
1 9.1 .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 follow s:
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. The TDT supplies power for both itself and the tape
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.
1 9 .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 perm its testing of all select lines to the tape drive.
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Страница 93: ...039 0035 FIGURE 1 BIT PO SITIO N S O N TAPE CURRENT GENERATOR FIGURE 3c...
Страница 95: ...w PATH OF TAPE THROUGH MACHINE FIGURE 6...
Страница 97: ...SPLIT IDLER ASSEMBLY FIGURE 8...
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Страница 99: ...CLUTCH HOUSING POWDERED IRON AND GRAPHITE MIXTURE FIGURE 10 MAGNETIC CLUTCH...
Страница 100: ...PUSH ROD DIAPHRAGM VACUUM COLUMN SWITCHES FIGURE II...
Страница 101: ...BACKWARD MOTOR CAPSTAN MOTOR FORWARD MOTOR...
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Страница 103: ...140 140...
Страница 107: ...FIGURE 18 HEAD ASSEMBLY A DJUSTM ENTS...
Страница 108: ...TAPE C LEA N ER FIG URE 19...
Страница 109: ...VACUUM COLUMN ADJUSTMENT FIG U RE 22...
Страница 110: ...DRIVE MOTOR PULLEY CAPSTAN DRIVE BELT TENSION FIGURE 23 REAR VIEW S...
Страница 113: ...CONTROL UNIT TAPE DRIVE TESTER FIGURE 28 TAPE DRIVE TESTER CO NN EC TIO N S...
Страница 116: ...FIGURE 32 HIGH SPEED REWIND...
Страница 129: ...A Capstan Out 13 16 iS i Aftr _ V 1 im m 1 W F B Capstan Retracted FIGURE 33 CAPSTAN DRIVE M O TO R 727 MODEL III...
Страница 130: ...Right Capstan Motor Bottom View Sensing Switch Assy Capstan Out FIGURE 34 CAPSTAN SEN SIN G SW ITCHES 727 MODEL III...
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