Real Time Clock Check; Cmos Ram Check; Touch Panel Diagnostics; Controller Diag Test - Sharp UP-5300 Service Manual

1) Real time clock Check

1
Checking 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 checks that the clock shows 0:0:0, 1/Jan/1990
after 2 sec.
2
Display
Real time clock Check
RTC Timer Check : PASS !!(or ERROR !!)
RTC Clock Check : PASS !!(or ERROR !!)
3
Terminating method
After the test result is displayed, press Esc key to terminate and
return to the RTC and CMOS RAM diagnostics menu.

2) CMOS RAM Check

1
Checking content
The read/write check is performed for CMOS-RAM when setting
up. The checking procedure is 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.
2
Display
CMOS-RAM Check
RTC RAM Check : PASS !!(or ERROR !!)
Error Address xxxxxH Write Data xxH
The error address and the error bit are displayed only when an
error occurs. (When no error occurs, they are not displayed.)
3
Terminating method
After the test result is displayed, press Esc key to terminate and
return to the RTC and CMOS RAM diagnostics menu.

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
Read Data xxH

1) Controller Diag Test

1
Checking content
After initializing the controller, the diagnostic command is ex-
ecuted. The procedures are as follows:
•
One byte of dummy data (FFh) is sent and a wait state of
100ms is made.
•
The reset command (80h) is sent and a wait state for the end
code (2 bytes: 90h and 00h) from the controller is made.
•
The diagnostic command (2 bytes: 89h, any one-byte data) is
executed, and a wait state for the end code (3 bytes: 90h,
return code, any one-byte data) is made.
•
If an error occurs the error display is made with the return code.
* To exit from the controller diagnostic test. press the Esc key
during the wait state for the end code response.
Return code
0Ah
0Bh
0Ch
0Dh
0Eh
0Fh
10h
2
Display
Controller Diag Test
Pass!!
or ROM Error!! Error!!
RAM Error!! Error!!
PANEL Voltage Error!!
EPROM Write Error!!
EPROM Read Error!!
EPROM SUM Error!!
3
Terminating method
After the test result is displayed, press the Esc key to terminate
and return to the Touch panel diagnostics menu.
2) Touch Key Pad Test
1
Checking content
The driver function call is used.
is displayed at the four corners of the LCD sequentially.
(In the sequence of upper right, upper left, lower left, lower right.)
When the is touched by the operator, the buzzer sounds
and the screen turns to
2
Display
3
Terminating method
Touch all four or press the Esc key to terminate and return
to the Touch panel diagnostics menu.
4 – 5
Content
ROM error
RAM error
Panel voltage error
Reserve
EPROM write error
EPROM read error
EPROM check sum error
.
Touch Key Pad Test
Touch Cursor !!