Real Time Clock & Cmos Ram Diagnostics; Real Time Clock Check; Cmos Ram Check; Touch Panel Diagnostics - Sharp UP-5700 Service Manual

3-5. Real time clock & CMOS RAM Diagnostics
RTC and CMOS RAM check is performed.
The following menu is displayed. The highlighted cursor is moved by
the cursor keys (UP and DOWN ) of the AT keyboard. Move the
cursor to the desired item, and press Enter key to execute the se-
lected diagnostics program. When the selected diagnostics program
is completed, the display returns to the menu screen. Pressing Esc
key returns to the service diagnostics menu.
Real time clock & CMOS RAM Diagnostics

Real time clock Check

CMOS RAM Check

1) Real time clock Check
Check content
RTC timer function and RTC clock function are tested.
In RTC timer check, the RTC timer is set so that an interrupt is
generated after 2 sec and check that the interrupt is performed
properly. In RTC clock check, the RTC clock is set to 23:59;58,
31/Dec/1989, and check that the clock shows 0:0:0, 1/Jan/1990
after 2 sec.
Display
Real time clock Check
RTC Timer Check : PASS !!(or ERROR !!)
RTC Clock Check : PASS !!(or ERROR !!)
Terminating method
After the test result is displayed, press Esc key to terminate,
2) CMOS RAM Check
Check content
Read/write check is performed for CMOS-RAM when setting up.
The check procedures are as follows:
i. Test address data is saved to the main memory.
ii. Test data 55H is written to the test address.
iii. Test data and read data are compared, and test data AAH is
written to the test address.
iv. Test data and read data are compared.
v. The saved test data is written to the test area.
vi. The address is incremented until it becomes 3FH.
If POFF interruption is generated during the test, the test is
stopped and the saved data is written to the test area within 50ms.
Display
CMOS-RAM Check
RTC RAM Check : PASS !!(or ERROR !!)
Error Address xxxxxH Write Data xxH Read Data xxH
The error address and the error bit are displayed only when an
error occurs. (When no error occurs, they are not displayed.)
Terminating method
After the test result is displayed, press Esc key to terminate.

3-6. Touch Panel Diagnostics

The touch panel and its controller are checked. Communication with
the controller is performed by 8250 built in the gate array PSC2.
The controller diag check, the touch keypad test, and the linearity test
are performed.
The initial display is as follows:
Touch Panel Diagnostics
Controller Diag Test
Touch Key Pad Test
Line arity

1) Controller Diag Test

Check content
After initializing the controller, the diag command is executed. The
procedures are as follows:
One byte of dummy data (FFh) is sent and waiting of 100ms is
made.
The reset command (80h) is sent and waiting for the end code
(2 bytes: 90h and 00h) from the controller is made.
The diag command (2 bytes: 89h, any one-byte data) is exe-
cuted, and waiting for the end code (3 bytes: 90h, return code,
any one-byte data) is made.
The error display is made with the return code.
To exit from the controller diag test. press Esc key during wait-
ing for the end code response.
Return code
0Ah ROM error
0Bh RAM error
0Ch Panel voltage error
0Dh Reserve
0Eh E
0Fh E
10h E
Display
Controller Diag Test
Pass!!
or ROM Error!! Error!!
RAM Error!! Error!!
PANEL Voltage Error!!
2
E PROM Write Error!!
2
E PROM Read Error!!
2
E PROM SUM Error!!
Terminating method
After the test result is displayed, press Esc key to terminate,
4 – 5
Content
2
PROM write error
2
PROM read error
2
PROM check sum error