Tandy 1000 Technical Reference Manual

Tandy 1000
4-4-11. Check and Adjustment of Track 00 Sensor
(A) Equipment
(1) Common screwdriver, M3
(2) Work disk
(3) Alignment disk
(4) SKA or user's system
(5) Oscilloscope (or digital voltmeter)
(6) Locking paint
(B) Check and adjustment procedure
(1) General method
Technical Reference Manual
(a) Use two channels of an oscilloscope and connect them as follows:
i) The 1st channel: STEP interface signal (pin No.20) or PCBA MFD
control U4, pin 5.
ii) The 2nd channel: PCBA MFD control TPI (Track 00 sensor).
IV range
iii) External trigger: DIRECTION SELECT interface signal (pin No.lS)
or PCBA MFD control U4, pin 11.
(+) trigger
(b) Start the spindle motor and install a work disk.
(c) Make the head move to track 00.
(d) Confirm that the timings tA and tB of the Track 00 sensor signal (TPl)
is within the following range when the DIRECTION SELECT (trigger
signal) and the STEP signal (6ms interval) as shown in Fig.427 is
supplied.
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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