Tandy 1000 Technical Reference Manual

Tandy 1000
TPl tA: 3.1 ~ 5.4msec
TPl tB: 0 ~ 5.Bmsec
Technical Reference Manual
(e) If the value in item (d) is out of the specified range, adjust the
position of the track 00 sensor according to the following procedure.
i) Loosen the fixing screw of the track 00 stopper (see Fig.429 and
shift the stopper in the step-out direction (make apart from the
rear side of the head carriage) .
ii) Connect an oscilloscope to TP9 or TPIO (Differentiation amp.)
of the PCB A MFD control.
Oscilloscope range: AC mode, 0.2V, 20msec
iii) Install an alignment disk. The track alignment should be adjusted
correctly according to item 4-4-10.
iv) Make the head move to the position where the lobe pattern as in
Fig.425 can be observed.
v) Remove the alignment disk.
vi) Step out the head for 16 tracks' space. (The head moves to track
00) .
vii) Change the connection of the oscilloscope as item (a).
viii) Loosen the fixing screws of the track 00 sensor (see Fig.42B)
and move the sensor a little so that the timing tA in Fig.427 falls
within the following range.
Adjusting target of TPl tA: 3.4 ~ 4.6msec
ix) Repeat the adjustment of the track 00 sensor position so that the
value in item viii) satisfy the specification when the screw has
been tightened with the specified torque.
x) Apply a drop of locking paint on the fixing screw head.
xi) Adjust the track 00 stopper according to item 4-4-12.
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Tandy 1000 Specifications

General

Processor	Intel 8088
Processor Speed	4.77 MHz
RAM	128 KB (expandable to 640 KB)
Operating System	MS-DOS 2.11
Manufacturer	Tandy Corporation
Release Year	1984
Storage	Single or double 5.25" floppy disk drive (360 KB), optional hard drive
Sound	Tandy 3-voice sound
Ports	Parallel, Serial
Graphics	CGA (Color Graphics Adapter)
Graphics Modes	320x200, 640x200