Tandy 1000 Technical Reference Manual

Tandy 1000
4-4-6. Check and Adjustment of Head Touch
Technical Reference Manual
Note: The adjustment applies to a single sided FDD only.
(A) Equipment
(l) Work disk
(2) Common screwdriver, small size
(3) SKA or user's system
(4) Oscilloscope (not required when the SKA is used)
(5) DC clip on ammeter (not required when the SKA is used)
(6) Locking paint
(B) Adjustment procedure
(1) General method
(a) Connect an oscilloscope to TP9 or TPIO (Differentiation amp.) on the
peBA MFD control.
Oscilloscope range: AC mode, 0.2V
(b) Start the spindle motor and install a work disk.
(c) Set the head to the innermost track.
(d) Repeat the cycle of one write rotation and one read rotation.
Write data should be the fixed pattern of 2F (250KHz of WRITE DATA
frequency) .
(e) Write down the average read level measured during the read operation
of item (d).
- 4049 -

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