Chapter 2. Adjustments; 1-Bit Section; Dvd/Cd Section; Test Mode - Sharp SD-AS10H(S) Service Manual

SD-AS10H
Audio E Market SD-AS10H Service Manual SD-AS10H
CHAPTER 2.
ADJUSTMENTS

[1] 1-bit section

1. 1-bit amplifier's output offset voltage adjustment
Adjustment VRA100, VRA101, VRA200, VRA201, VRA300 and
VRA301 so that the DC voltage between speaker terminals (SO801) +
and - is set to 0 ± 5 mV at AC 230 V.
Set
VR : 0
AC 230 V
Input : AUX
Figure 1 OUTPUT OFFSET LEVEL
1-BIT AMP. PWB
L-CH OUTPUT
ADJUSTMENT
R-CH OUTPUT
ADJUSTMENT
Figure 2 ADJUSTMENT POINTS
Electronic
Voltage
Output:
Speaker Terminal
+
-
SO801
VRA300 VRA301
R-CH OUTPUT L-CH OUTPUT
OFFSET OFFSET
ADJUSTMENT ADJUSTMENT
VRA200 VRA201
R-CH OUTPUT
OFFSET OFFSET
ADJUSTMENT
VRA101 VRA100
L-CH OUTPUT
OFFSET OFFSET
ADJUSTMENT

[2] DVD/CD section

Since this DVD/CD system incorporates the following automatic adjust-
ment functions, readjustment is not needed when replacing the pickup.
Therefore, different PWBs and pickups can be combined freely.
Each time a disc is changed, these adjustments are preformed auto-
matically. Therefore, playback of each disc can be preformed under
optimum conditions.

[3] TEST Mode

1. TEST Mode Functions
1.1. Entering the TEST Mode
Turn off the power, hold down the FUNCTION button and DISC 1 but-
ton and press the POWER button to enter the test menu mode. The
power turns back on in this mode and the ROM version appears on the
LCD by default. See below for other items to be displayed.
When the power turns on, Protect monitoring, AMP and power control
are activated basically in the same way as the normal mode.
Then select a test mode using the VOLUME UP/DOWN buttons and
press the PLAY button to enter. Alternatively, press a direct number
button while the version appears to enter the corresponding mode
directly.
No. TEST MODE
1 FACTORY RESET
2 AMP TEST
3 KEY TEST
4 TUNER TEST
6 MUTE TEST
7 DVD FACTORY
RESET TEST
8 CHANGER AGING
TEST1
9 CHANGER AGING
TEST2
10 CHANGER AGING
TEST3
11 CHANGER AGING
TEST4
12 SYS EEPROM
WRITE
13 AMP EEPROM
WRITE
14 CHANGER
MANUAL TEST
15 DVD UPDATE TEST
(without changer)
16 CH DVD UPDATE
TEST (with changer)
17 ASPM TEST
* OPTION appears in the menu. Make sure to keep it disabled.
* The 8-digit display field in the lower part of the LCD shows items in
"DISPLAY" (see above) according to the test mode.
1.2. Canceling test mode
1. The power turns off unless otherwise specified.
(The RAM clear process is performed only for specified RAMs.)
2. If power supply interruption is detected, the test mode is canceled
and the necessary handling process begins.
2 – 1
DIRECT KEY DISPLAY
STOP INITIAL MENU
FAST FORWARD AMP MENU
REVIEW KEY MENU
TUNER TUNER MENU
MUTE MENU
DVD RESET
MENU
DISC1 CHANGER 1
DISC2 CHANGER 2
CHANGER 3
CHANGER 4
S.EEPROM
MENU
A.EEPROM
MENU
DISC5 CHANGER
MENU
DVD UPD MENU
CH DVD UPD
MENU
DISC4 ASPM MENU