Chapter 6. Trouble Shooting - Sharp SL-5500 Service Manual

PC-UM10M

CHAPTER 6. TROUBLE SHOOTING

CONTENTS
1. DOES NOT OPERATE
2. DOES NOT DISPLAY (THERE ARE KEY SOUNDS, BUT NO DIS-
PLAY.)
3. THE FRONT LIGHT DOES NOT TURN ON
4. INPUT OPERATIONS WITH THE TABLET ARE INVALID
5. CANNOT BE DISCHARGED
6. KEY INPUTS ARE INVALID
7. ABNORMAL DISPLAY COLORS
8. SHORT BATTERY LIFE
9. THE CF CARD (SD CARD) IS NOT RECOGNIZED. / WHEN THE
CF CARD IS INSERTED, NO OPERATION IS PERFORMED
Note: 1. When receiving a repair request, explain that user data are
not recovered.
If recovery of user data is strongly requested, try to backup
only the PIM data without warranty.
(For the utility program, use one that is supplied from
Sharp.)
2. Check that the program in the FLASH ROM is what was
released by Sharp.
(If the program has been modified by the user, it may be
out of warranty.)
3. When the machine enters the diag mode, the user data
are destroyed.
When checking with the diag, be sure to confirm the user
whether the user data should be recovered or not in
advance.
If the user data should be recovered, back up the user
data before executing the diag operations.
1. DOES NOT OPERATE
1) Check the operation (with the
user's battery pack.)
Check the battery replacement
switch. Press the ON/OFF key.
Does not
operate.
Connect the AC adapter
and perform procedure 1).
Does not operate.
(LED (A) remains OFF.)
2) Enter the diag mode and press
any key.
No display and
no key sound
Open the set and check
the following:
1) Check the voltage of each power source.
Is VCC3 normal?
Is VCC5 normal?
Is VCC-CORE normal? VCC-CORE=1.8V m 0.18V
2) Check for disconnection of the fuse in each power line.
Fuses to be checked: "F803" "F806" "F805" "F801"
Check conduction with a tester. (Be careful to avoid
contact between the tester probe and the parts.)
*3: Check the figure of AIN0 that is displayed on the lower side of the
diag menu.
If the figure is 1000 or greater, it might be considered that no
battery is inserted.
Replace the battery with new one.
SL-5500 TROUBLE SHOOTING
– 60 –
Return to the user.
Does
(Explain that the power is not
operate.
turned on with the battery
replacement switch at
REPLACE.)
Does operate or
LED (A) turns ON. Explain that the battery is
exhausted, and return to the
LED(A) user.
flashes.
To *3
Key
sound
Refer to [2. Does not display.]
VCC3=3.3V m 0.3V
VCC5=5V m 0.5V
LED (A)