Read Sharp UP-5900 (serv.man8) Service Manual online
UP-5900VS
DIAGNOSTICS SPECIFICATIONS
4 – 3
3-4. ROM DIAGNOSTICS
The BIOS ROM, is tested.
1) BIOS ROM CHECK
1
Checking content
The BIOS ROM version is displayed.
2
Display
3
Terminating method
After the test result is displayed, press Esc key to terminate and
return to the service diagnostics menu.
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
the cursor keys (UP
2
and DOWN
4
) of the PS2 keyboard. Move the
cursor to the desired item, and then press the Enter key to execute the
selected diagnostics program. When the selected diagnostics program
is completed. Pressing the Esc key again returns to the service diag-
is completed. Pressing the Esc key again returns to the service diag-
nostics menu.
1) REAL TIME CLOCK CHECK
1
Checking content
RTC timer function and RTC clock function are tested.
2
Display
3
Terminating method
After the test result is displayed, press the 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 the CMOS-RAM when setting
up. The checking procedure is as follows:
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
The error address and 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 the Esc key to terminate and
return to the RTC and CMOS RAM diagnostics menu.
3-6. KEY PAD DIAGNOSTICS
1) KEY PAD CHECK
The UP-C30PK key test is performed. In the UP-C30PK, keys are
detected by matrix scan of KBC (M38802M270).
detected by matrix scan of KBC (M38802M270).
1
Display
BIOS ROM Check
Version - ROM : SHPUP****
The version is displayed.
Real time clock & CMOS RAM Diagnostics
Real time clock Check
CMOS RAM Check
Real time clock Check
RTC Timer Check : PASS !!(or ERROR !!)
RTC Clock Check : PASS !!(or ERROR !!)
CMOS-RAM Check
RTC RAM Check : PASS !!(or ERROR !!)
Error Address xxxxxH Write Data xxH Read Data xxH
Key Pad Diagnostics
ESC
When this is pressed, the buzzer sounds
and the color changes.
and the color changes.
Press ESC key to exit.
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