Sharp SD-AT100 (serv.man7) Service Manual ▷ View online
– 21 –
SD-AT100H
TUNER SECTION
Frequency
Display
Adjusting
Parts
Instrument
Connection
98 MHz
98 MHz
VR1
Input: FM Antenna
(26dB)
Terminal
(EFM)
Output: Headphones
Terminal
fL: Low-range frequency
fC: Middle-range frequency
fH: High-range frequency
fC: Middle-range frequency
fH: High-range frequency
• FM Mute Level
Signal generator: 400 Hz, 22.5 kHz, FM modulated
Signal generator: 400 Hz, 22.5 kHz, FM modulated
Turn the VR1 to set the volume to 26dB.
TEST MODE
When the tuner test mode is set, the initial setting of frequencies
is stored in the preset memory as shown in Table 1. For
details, refer to "8. Tuner test" on page 27.
The frequencies registered by the user will be changed when
the above setting is performed.
is stored in the preset memory as shown in Table 1. For
details, refer to "8. Tuner test" on page 27.
The frequencies registered by the user will be changed when
the above setting is performed.
Preset
Memory
Frequency
FM
Preset
Memory
Frequency
AM
P1
87.50 MHz
P6
522 kHz
P2
108 MHz
P7
1,620 kHz
P3
90.00 MHz
P8
603 kHz
P4
106.00 MHz
P9
1,404 kHz
P5
98.00 MHz
P10
990 kHz
Table 1 Memory setting
Electronic
Voltmeter
Voltmeter
GND
FM Signal
Oscillator
Oscillator
Set
Headphones
Terminal
FM Antenna
Terminal
Terminal
Figure 21-1
Figure 21-2
+
–
Set
AC 230 V
BIA110
Speaker
Output
Electronic
Volteter
VR : 0
Input : AUX
Input : AUX
VRA101
R-CH
Output Offset Adjust
R-CH
Output Offset Adjust
VRA100
L-CH
Output Offset Adjust
L-CH
Output Offset Adjust
1-bit amplifier's output offset voltage adjustment
Adjust VRA100 and VRA101 so that the DC voltage between
speaker terminals + and - is set to 0
speaker terminals + and - is set to 0
±
5 mV.
Figure 21-3
Figure 21-4
DVD/CD SECTION
• Adjustment
Since this DVD/CD system incorporates the following
automatic adjustment 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
performed automatically. Therefore, playback of each disc
can be performed under optimum conditions.
automatic adjustment 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
performed automatically. Therefore, playback of each disc
can be performed under optimum conditions.
VR1
TUNER UNIT
SD-AT100H
– 22 –
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.
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.
on the remote control while the version number is displayed, the unit enters the specified test mode directly.
No.
Display
1
Shipment Test Mode
“1” of ten-key keypad
INITIAL
2
DVD TEST
“2” of ten-key keypad
TONE
3
AMP TEST
“3” of ten-key keypad
AMP
4
KEY TEST
“4” of ten-key keypad
KEY
5
DVD MECHA TEST
“5” of ten-key keypad
MECHA
6
DVD ROM WRITE TEST
“6” of ten-key keypad
DVD ROM
7
TUNER TEST
“7” of ten-key keypad
TUNER
8
ASPM (RDS) TEST
“8” of ten-key keypad
ASPM
Direct Key
Test Mode
∗
In each test mode, “TEST” appears at the top of the FL and that shown under “Display” of the table above at the bottom.
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.)
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.)
• Canceling the test mode
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.
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.
Notes for handling the mechanism unit
Soldering on the
mechanism PWB (two points)
mechanism PWB (two points)
DVD Motor PWB
4X
Flexible PWB
– 23 –
SD-AT100H
1. Shipment Test Mode
Outline:
Initialization of EEPROM in the DVD unit
Function:
The unit is set to “Shipment”. (The state immediately after shipment)
- All the functions and conditions are initialized.
- Clear all of tuner preset memory
- Clock initialization
- Clearing DVD memory
- Resetting DVD memory
- Initialization of DVD mechanism
- Set the DVD mechanism as above.
- Clear all of tuner preset memory
- Clock initialization
- Clearing DVD memory
- Resetting DVD memory
- Initialization of DVD mechanism
- Set the DVD mechanism as above.
Operation: When the unit enters the shipment test mode.
1. “TEST” flashes at the top of the FL, and “INITIAL” at the bottom.
2. When initialization is complete, “COMPLETE” appears in the FL before the unit exits the test mode, and then the
power is turned off. If initialization fails, “INT ERR” appears in FL, and the unit stands by until the POWER key
ispressed.
2. When initialization is complete, “COMPLETE” appears in the FL before the unit exits the test mode, and then the
power is turned off. If initialization fails, “INT ERR” appears in FL, and the unit stands by until the POWER key
ispressed.
"INITIAL" display
I
I
N
T
I
A
L
M
O
C
P
L
E
T
E
"COMPLETE" display
SD-AT100H
– 24 –
2. DVD Test Mode
Outline:
The key code of the test mode 1 is transmitted to the DVD unit to start up the test mode. Hereafter, the system
microcomputer only sends the key code to the DVD unit. Although operations of the main unit can be commenced
in the same manner as the DVD/CD functions, nothing has to be controlled except for monitor output. Therefore,
the sound is always mute, and the SP relay of each channel is always off, too.
As the CD cover must be kept closed with a disc inserted before entering the test mode, opening and closing
operations are not required, either. (In this test mode, no opening or closing operation is required.)
The FL display shows “DVD TEST” while in the test mode, and turns off all the other segments.
microcomputer only sends the key code to the DVD unit. Although operations of the main unit can be commenced
in the same manner as the DVD/CD functions, nothing has to be controlled except for monitor output. Therefore,
the sound is always mute, and the SP relay of each channel is always off, too.
As the CD cover must be kept closed with a disc inserted before entering the test mode, opening and closing
operations are not required, either. (In this test mode, no opening or closing operation is required.)
The FL display shows “DVD TEST” while in the test mode, and turns off all the other segments.
Function:
1. Start up the test mode in the same manner as the DVD/CD functions, and also start the DVD unit in the normal
operation. The display shows “DVD TEST” through this test mode, and turns off all the other segments.
2. All the other function may be started in the normal operation. Leave the mute ON since no sound is to be emitted,
and the SP relay of each channel OFF.
3. After the DVD unit is started, the key code (F1h) of the test mode 1 is transmitted in the form of the communication
data.
4. If the status data of Byte No. 24 is set to 0Fh, the system microcomputer will communicate with the DVD unit as
usual. However, the communication data from the DVD unit does not have to be checked. The microcomputer
accepts the only keys described in the table below, and sends the key code to the DVD unit.
(No opening or closing operation is required.)
5. “COMPLETE” is displayed by pressing the POWER key, and the system microcomputer is reset and restarted
to cancel this test mode.
operation. The display shows “DVD TEST” through this test mode, and turns off all the other segments.
2. All the other function may be started in the normal operation. Leave the mute ON since no sound is to be emitted,
and the SP relay of each channel OFF.
3. After the DVD unit is started, the key code (F1h) of the test mode 1 is transmitted in the form of the communication
data.
4. If the status data of Byte No. 24 is set to 0Fh, the system microcomputer will communicate with the DVD unit as
usual. However, the communication data from the DVD unit does not have to be checked. The microcomputer
accepts the only keys described in the table below, and sends the key code to the DVD unit.
(No opening or closing operation is required.)
5. “COMPLETE” is displayed by pressing the POWER key, and the system microcomputer is reset and restarted
to cancel this test mode.
[Acceptable keys and key codes transmitted to the unit in DVD test mode]
Transmit Key Code
Key Name
Name
Note
HEX Value
PLAY/PAUS
Play
26h
In the normal operation mode, Play or Pause key code is
transmitted after checking the DVD status data. In test this mode,
however, always Play key code is transmitted.
Stop
Stop
27h
In the normal operation mode, Stop or Open/Close key code is
transmitted after checking the DVD status data. In this test mode,
however, always Stop key code is transmitted.
STOP
Stop
27h
(REMOTE CONTROL)
OPEN/CLOSE
Open/Close
24H
The key code is transmitted to the DVD unit in the same manner
as the normal operation, and the CD cover is controlled by the
Tray Open/Close command from the DVD unit.
SKIP UP/CUE
Skip+
2Ch
In this test mode, always Skip+/Next key code is transmitted.
SKIP DOWN/REV
Skip-
2Bh
In this test mode, always Skip-/Pver key code is transmitted.
P-MODE
Repeat
32h
In this test mode, always Repeat key code is transmitted.
A-B
A-B Repeat
49h
PROGRAM
Program
20h
CLEAR
Clear
20h
1 key
1
01h
2 Key
2
02h
3 Key
3
03h
4 Key
4
04h
5 Key
5
05h
6 Key
6
06h
7 Key
7
07h
8 Key
8
08h
9 Key
9
09h
0 Key
0
0Ah
ENTER
Enter
70h
Keys described in the table above are used in this test mode. However, even if one of the following keys for DVD is pressed,
the corresponding key code will be transmitted as well:
ON SCREEN, DISPLAY, CUE, REVIEW, Cursor Up/Down/Left/Right, RETURN, ZOOM, MENU TOP-MENU, PLAY
CONTROL, SUBTITLE, ANGLE, SOUND, DVD MENU, GAMMA, SUPER PICTURE, SLOW>, STILL>, DIRECT
the corresponding key code will be transmitted as well:
ON SCREEN, DISPLAY, CUE, REVIEW, Cursor Up/Down/Left/Right, RETURN, ZOOM, MENU TOP-MENU, PLAY
CONTROL, SUBTITLE, ANGLE, SOUND, DVD MENU, GAMMA, SUPER PICTURE, SLOW>, STILL>, DIRECT
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