Tandy 1000 Technical Reference Manual

Tandy 1000
Technical Reference Manual
3
TP5(Read data)
READ DATA
Trigger
(Fig.421) Measurement of asymmetry
(h) If the value in item (f) or (g) is out of the specified range, adjust
according to the following procedure.
The adjustment can be done only for the PCBA versions or the PCBA
revision numbers with the variable resistor R5 on the PCBA MFD control.
No adjustment can be done without R5.
i) Adjust the variable resistor R5 so that the asymmetry takes the
minimum value while repeating IF write and IF read operations
alternately.
ii) For a double sided FOO, repeat the operation in item i) for the
side 0 and the side I heads alternately. The variable resistor
shall be so adjusted that both asymmetry for side I and side 0 heads
take the minimum value.
(i) If the values in items (f) and (g) are out of the specified range
in the PCBA without the variable resistor R5, or if the adjustment
in item (i) cannot be done sUfficiently even if R5 is mounted,
following causes are assumed.
i) Leakage flux density in the environmental condition of the FOO
is high:
If there is some flux source near the FDD such as magnet,
transformer, motor, Brown tube, magnetized iron plate, etc., take
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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