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Disassembly Nstructions; General Operating Nstructions; Power Supply Board - Texas Instruments SAMS TI-99/4A PHC004A Technical Service Data

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GENERAL OPERATING INSTRU TIONS
POWER UP
When the computer is turned On, the main title screen will be
displayed on the monitor. Press any key and a menu will be
displayed.
The menu choices will be determined by the Solid State Car ­
tridge used. Turn the computer Off when inserting or remov ­
ing a Solid State Cartridge. Refer to the menu and press the
key for the desired function.
For instructions to load and save programs on cassette tape,
refer to "Cassette Operation". Run a basic program by typ ­
ing RUN and press the ENTER key.
Stop a program by
holding down the FCTN key and press the number 4 key. The
computer will return to the basic mode and the program will
be unaffected.
Reset the computer by holding down the
FCTN key and press the = key. The computer will return to
the main title screen and any program in memory will be lost.
ASSETTE OPERATION
Connect the cassette cable to the cassette plug on the rear of
the computer. Connect the plug with the red wire to the Mic
input on the recorder, the plug with the white wire to the Ear ­
phone output on the recorder and the plug with the black wire
to the Remote input on the recorder.
NOTE: The remote control may not work on some recorders.
Set the Tone control on the recorder to Maximum and the
volume control to mid-range. Verify the ALPHA LOCK key, on
the computer, is in the down position and put the computer in
BAS C mode.
Save a program by typing SAVE CS1, press the ENTER key
and follow the instructions that appear on the monitor
screen.
Load a program by typing OLD CS1 , press the ENTER key and
follow the instructions that appear on the monitor screen. f
a program will not load, set the Volume control to a different
level and try loading the program again.
When using two recorders, the recorder connected to the three plug
section of the cable will be CS1 and the recorder connected to the two
plug section will be CS2. CS2 can be used for saving programs or
data only. Save a program on CS2 by typing SAVE CS2, press the
ENTER key and follow the instructions that appear on the monitor.
DISASSEMBLY INSTRU TIONS
ABINET BOTTOM REMOVAL
Remove the On-Off knob. Remove Phillips screws 1 thru 7
(See Figure 1) from the bottom and remove the cabinet bot ­
tom.
POWER SUPPLY BOARD REMOVAL
Remove Phillips screws 7 and 8 (See Figure 2) from the power
supply board. Lift the board up, unplug the cable going to the
main board and remove the power supply board.
4
5
6
7
0
0®®
Figure 1
BOTTOM V EW
MAIN BOARD REMOVAL
Remove Phillips screws 1, 2 and 3 (See Figure 2) holding the
main board. Lift up the main board, unplug the keyboard and
remove the main board.
To remove the shield, remove the two metal clamps (See
Figure 2) and unplug the cartridge plug.
Remove Phillips
screws and nuts 4, 5 and 6 (See Figure 2) and remove the top
and bottom shield.
KEYBOARD REMOVAL
Remove Phillips screws 9 thru 12 (See Figure 2) holding the
keyboard. Unplug the keyboard from the main board and
remove the keyboard.
BOTTOM V EW
12

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