Check List - Tandy 102 Service Manual

Check List
After completing all repairs and adjustments, check all functions according to the Test Program as
shown below. A model 100 diagnostics tape available through Radio Shack can also be used.
Before beginning the checking, initialize the RAM contents by performing a cold start. Refer to "(4)
Reset function test".
(1) Buzzer and LCD check (in BASIC mode)
10 FOR 1 = 0 TO 255
20 PRINT CHRS (1);
30 NEXT 1
40 END
After 1 beep and the LCD display clears, all characters are displayed.
(2) Clock test (in BASIC mode)
(a) Setting the year, month, date, day, hour, minute and second:
Year, month, date setting: Date$ = "MM/DD/YY"
Day setting: DAY$ _ "day" (example: Sunday = SUN)
Hour, minute, second setting: TIME$="HH: MM: SS"
(b) Confirmation of set data
Return to the menu by executing the MENU command. Then, check to be sure that the
calendar data changes to set data.
(3) Key board test
Refer to the character code table in Appendix B and check that all keys can be input.
(4) Reset function test (memory protection test)
(a) Warm start
Press the RESET switch on the rear of the case or switch the POWER switch to ON, and
check that initialization is made. Also check that the saved USER files are not erased.
(b) Cold start
While pressing the CTRL and PAUSE keys, press the RESET switch and check that all USER
files are erased.
(5) Printer interface test (in BASIC mode)
Input the characters to be printed out on the LCD display. When the hard copy key PRINT is
pressed, the displayed characters will all be printed out.
(6) Casse
tt
e interface test (in BASIC mode)
Input a suitable program, save it on cassette (by CSAVE "file name"), and then read out the
saved program (by CLOAD "file name") and check it.
(7) RS-232C and MODEM tests.
Prepare two units and make the tests while referring to the section on communications in the
Operation Manual.