Sharp PC-E500 - Software Diagnostic Checks; Display Check; Mask ROM Verification; Built-in RAM Check

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10. Check software for servicing
* Check item
(1) Liquid crystal visual check (alternate display)
(2) Mask ROM verify check
(3) Built-in RAM read/write check
(4) 11 pin /O check -
(5) 15 pin VO check
(8) RAM card read/write check
¢ Required tools
Jig UKOGC3020CSZZ: Used for (4) and (5).
* Outline of using method
Before inputting a check software, clear the RAM completely.
When check (6) is executed, the RAM card content is deleted.
Save programs and data before check, if necessary.
<MENU> MENU screen
4: DISP 2: ROM 3: RAM er
4: 11PIN 5: 15PIN 6: CARD
i) Key input
(1) DISP (display) check
@ Key input
(2) Mask ROM check
(3) Key input
(3) Built-in ROM check
en Key input
(4) 11 pin check
(e) Key input
(5) 15 pin check
Key input
(8) RAM card check
Note: To end a check, press the BRK[ON] key.
* Details of each check
(1) DISP (display) check
MENU screen
\a
3 Alternate display
* All symbols light up.
a)
ee Alternate reversion
fe all symbols go off.
\d
MENU screen
PC-E500
(2) Mask ROM check
MENU screen
\@
ROM CHECK (WAIT 6 SEC)
Buzzer (Once)
ROM CHECK (WAIT 6 SEC)
ERROR!
Buzzer
(3 times)
ROM CHECK (WAIT 6 SEC)
EX Ver. 1 (LH5320XH)
ROM CHECK OK!
MENU screen
(3) Built-in RAM check
MENU screen
Buzzer (once)
Buzzer RAM CHECK ERRORI!
(3 times)
RAM CHECK OK!!
MENU screen