Sharp SD-AS10, Руководство по обслуживанию

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SD-AS10
2 – 1
Audio SD-AS10 Service Manual SD-AS10 Market E 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 120 V.
[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.
* 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.
Figure 1 OUTPUT OFFSET LEVEL
Figure 2 ADJUSTMENT POINTS
Electronic
Voltage
SO801
AC 120 V
Set
Output:
Speaker Terminal
+
-
VR : 0
Input : AUX
VRA300 VRA301
VRA200 VRA201
VRA101 VRA100
1-BIT AMP. PWB
L-CH OUTPUT
OFFSET
ADJUSTMENT
L-CH OUTPUT
OFFSET
ADJUSTMENT
L-CH OUTPUT
OFFSET
ADJUSTMENT
R-CH OUTPUT
OFFSET
ADJUSTMENT
R-CH OUTPUT
OFFSET
ADJUSTMENT
R-CH OUTPUT
OFFSET
ADJUSTMENT
No. TEST MODE DIRECT KEY DISPLAY
1 FACTRY Test Mode STOP INITIAL MENU
2 AMP TEST FAST FORWARD AMP MENU
3 KEY TEST REVIEW KEY MENU
4 TUNER TEST TUNER TUNER MENU
6 MUTE TEST FUNCTION MUTE MENU
7 DVD FACTORY
RESET TEST EJECT DVD RESET
MENU
8 CHANGER AGING
TEST1 DISC1 CHANGER 1
9 CHANGER AGING
TEST2 DISC2 CHANGER 2
10 CHANGER AGING
TEST3 DISC3 CHANGER 3
11 CHANGER AGING
TEST4 CHANGER 4
12 SYS EEPROM
WRITE S.EEPROM
MENU
13 AMP EEPROM
WRITE A.EEPROM
MENU
14 CHANGER
MANUAL TEST DISC5 CHANGER
MENU
15 DVD UPDATE TEST
(without changer) DVD UPD MENU
16 CH DVD UPDATE
TEST (with changer) CH DVD UPD
MENU