Sharp SD-AT100H Service Manual page 22

SD-AT100H
Notes for handling the mechanism unit
Since the pickup semiconductor laser can easily damaged by
the static electricity, handle the mechanism unit with care.
To prevent damage by the static electricity during
transportation, the LD terminals are short-circuited at 2 points
on the PWB. Unsolder them by a soldering iron after
completing the connection. When you return the mechanism
unit, solder the terminals again.
TEST MODE
• Shifting to the test mode
If the POWER key on the main unit is pressed while the PLAY and VOLUME UP keys are held down in the power off state, the
unit enters the test menu mode. "AT100" is displayed at the top of the FL, and "Ver. ∗∗∗∗" (∗∗∗∗ shows version No.) at the bottom.
Then, press the VOLUME UP or DOWN key to select the test mode, and determine it with the PLAY key. If direct keys are pressed
on the remote control while the version number is displayed, the unit enters the specified test mode directly.
No.
1 Shipment Test Mode
2 DVD TEST
3 AMP TEST
4 KEY TEST
5 DVD MECHA TEST
6 DVD ROM WRITE TEST
7 TUNER TEST
8 ASPM (RDS) TEST
∗ In each test mode, "TEST" appears at the top of the FL and that shown under "Display" of the table above at the bottom.
• Canceling the test mode
Pressing the POWER key in the test mode will display COMPLETE for 1 second, and then cancels the test mode.
2. If the power failure occurs in each test mode, cancel the test mode and perform an operation to recover the electricity.
(To reset the unit after the electricity resumes, be sure to write in irregular data for RAM check.)
Flexible PWB
Test Mode
Soldering on the
mechanism PWB (two points)
DVD Motor PWB
Direct Key
"1" of ten-key keypad
"2" of ten-key keypad
"3" of ten-key keypad
"4" of ten-key keypad
"5" of ten-key keypad
"6" of ten-key keypad
"7" of ten-key keypad
"8" of ten-key keypad
– 22 –
Display
INITIAL
TONE
AMP
KEY
MECHA
DVD ROM
TUNER
ASPM