Tandy 1000 Technical Reference Manual

Tandy 1000
4-5-6. Replacement of PCBA MFD Control (C)
(A)
Tools
(1) Cross point screwdriver, M3
(2) Box screwdriver for hexagon nut, M3
(3) 5KA or user's system
(B) Replacement procedure
Technical Reference Manual
(1) Remove the shield cover (Fig.505, No.44) by removing two fixing screws
(Fig.505, 51).
(2) Remove three fixing screws of the PCBA MFD control (Fig. 505, No.35)
and lift up the PCBA.
(3) Disconnect all of the connectors mounted to the PCBA MFD control and
remove the PCBA.
(4) Install a new PCBA MFD control in the reverse order of items (2) and (3).
(5) Set the straps as they were on the old PCBA.
(6) Check and adjust the asymmetry according to item 4-4-7. (Adjustment is
applied only for the PCBA MFD control with the variable resistor, R5.
(7) Check for the read level according to item 4-4-8.
(8) Check for the resolution according to item 4-4-9.
(9) Check for the track 00 sensor according to item 4-4-11.
(10) Attach the shield cover in the reverse order of item (1).
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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