Sharp SD-AS10, Service Manual

Page: 12 / 188

SD-AS10
2 – 6
13. Aging Mode 4 (Drum cam test)
During stand-by press DISC1+FPOWER button.
Then press DISC4 button.
Button:
PLAY, STOP, POWER
Other button invalid.
All remocon button invalid.
Changer LED function as normal.
V/H sw function as normal.
DRUM CAM error detect function as normal.
1. If press STOP button, aging process stop and counter display as
last number.
2. If press PLAY button, counter reset to “00000”and aging process
start from first process.
3. If press POWER button, cancel test mode, then power off process.
4. If error occur, aging process stop, counter display as last number
and display error.
14. CH DVD Update TEST Mode (with changer)
1) The power turns on with the DVD function active and DVD unit
start-up process performed.
2) Set at DISC1. Only EJECT and PLAY button valid.
3) Insert the update disc and press PLAY button. When PLAY button
is pressed, system micom side will send 0 x 87 command.
4) Wait for 0 x 40 status from ESS side.
5) After received 0 x 40 status, send 0 x 87 command.
At this time TR code is fix to 0 means that only POWER button is
valid.
6) During updating the OSD (TV display) will show WRITE/ERASE
frequently and lastly DONE displayed.
Meaning the DVD update process is complete.
7) Next, press POWER button. The POWER code is sent to ESS to
turn off DVD unit only. At the same time DISC1 will eject.
8) After 1 sec. DVD unit turn off, it will turn on again to performed fac-
tory reset process.
9) The process is same as DVD FACTRY RESET test, display on
LCD.
10)When DVD Ver: xxxxx, AC OFF the set.
If the process is incomplete the ERROR will be display.
[4] Description on the Circuits of the 1-Bit
Unit (See the wiring diagrams on pages 6-
21, 6-22.)
1. Input Part
Signals input from BIA201 are input to the AD conversion IC (ICA100,
ICA200 and ICA300) coupled by “CA100, CA200 and CA300” and
“CA101, CA201 and CA301”.
2. Modulation 1-Bit Converter
Signals input to the AD conversion ICs (ICA100, ICA200 and ICA300)
are converted into 1-bit signals for differential output. For detailed
description of the conversion into 1-bit signals, refer to the Technical
Manual for SM-SX100 already published.
3. Low Pass Filter Circuit
The 1-bit signals switched at the output ICs (ICA101, ICA102, ICA201,
ICA202, ICA301 and ICA302) are converted into analog signals by
passing through the low pass filter consisting of LA104 to LA107,
LA204 to LA207, LA304 to LA307 and CA114 to CA117, CA214 to
CA217, CA314 to CA317.
The property of low pass filter is flat up to 20 kHz and attenuated at
approx. 40 kHz by approx. 3 dB.
4. Dynamic Feedback Circuit
The 1-bit signals switched at the output ICs (ICA101, ICA102, ICA201,
ICA202, ICA301 and ICA302) are amplified between plus power and
GND.
By resistive division, the 1-bit signals pass through 75 k
Ω
of NF resis-
tance (RA155 to RA158, RA255 to RA258, RA355 to RA358) and are
fed back to the AD conversion IC (ICA100, ICA200, ICA300). P-P volt-
age at this time is approx. 5 V.
*Counter display:
Test name.
Counter.
Error. Only if error occur.
No
(All character is in 5x7)
Yes
*Process continue unless
press STOP button.
*Default "00000".
After "99999" go to "00000".
AGING4
00000
ERROR CARRY
PLAY
button
D1 Play position
Check V/H sw
D5 LD/EJ position
D1 Play Position
Counter up
Wait 1sec
Start
Changer Initial Process
(Counter display)