Tandy 1000 Technical Reference Manual

Tandy 1000
Technical Reference Manual
TP9,TPIO(ADD
Vp-p
(Fig.423) Measurement of average read level (2F)
(g) Confirm that the true value of the read level is within the following
range.
Innermost track read level
1.4Vp-p, Min.
(h) For a double sided FOD, execute items (d) through (g) for the side 0
and the side 1 heads respectively.
(i) If the value in item (g) or (h) is out of the specified range,
following causes are assumed.
i) Inferior disk:
Disk and/or jacket is deformed or damaged. Replace the level disk
with a new one.
ii) Abnormal disk rotational speed:
Check and adjust according to item 4-4-5.
iii) Inferior head touch:
Check and adjust according to item 4-4-6.
iv) Inferior head:
Replace the head carriage Ass'y according to item 4-5-1.
v) Inferior PCBA MFD control:
Replace the PCBA MFD control according to item 4-5-6.
(k) Eject the level disk and release the Invert and ADD modes of the
oscilloscope.
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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