Pioneer
car audio - DEH-2350UB/XNES, DEH-2350UBG/XNES, DEH-2350UBSW/XNES, DEH-2350UB/XSES,
DEH-2350UB/XNES1
Rated
power source...............14.4 V DC
(allowable voltage range: 12.0 V to 14.4 V DC)
Maximum
power output .......50 W × 4(allowable voltage range: 12.0 V to 14.4 V DC)
Continuous power output ...22 W × 4 (50 Hz to 15 000 Hz, 5 % THD, 4 load, both
channels driven)
Load impedance ......................4 (4 to 8 allowable)
Load impedance ......................4 (4 to 8 allowable)
With
a 2 speaker system, do not connect anything to the speaker leads that are not
connected to speakers.
Power
amp (sold separately)
Error codes
If
a CD memory device is inoperable, or operation of such media is stopped by an
error, the error mode is established and a cause of the error is displayed by
an error code. Indication of error codes is intended to reduce the number of
calls from customers and facilitate failure analysis and repair work in
servicing.
Display method
If “0xFD” error mode is displayed in CD MODE (CD MODE area for display), an error code will be displayed in the MIN (minute display) and SEC (second display) areas,
If “0xFD” error mode is displayed in CD MODE (CD MODE area for display), an error code will be displayed in the MIN (minute display) and SEC (second display) areas,
The
same code is displayed in the MIN and SEC areas.
The TNO area is blank (#0FFH), as it conventionally was.
• Display example of the main unit
Depending on the display capability of LCDs, the display format varies, as shown below. XX denotes an error number.
Note: In a case of an OEM product, the error display format is subject to the specifications used by the equipment manufacturer,
The TNO area is blank (#0FFH), as it conventionally was.
• Display example of the main unit
Depending on the display capability of LCDs, the display format varies, as shown below. XX denotes an error number.
Note: In a case of an OEM product, the error display format is subject to the specifications used by the equipment manufacturer,
•
Indications of error codes are available only during disc operations, because
CD operations are unavailable if a mechanical error is generated.
• If the TOC cannot be read, this is not processed as an error, and operation continues accordingly.
• If you design a new head unit, be sure to use one of the display formats indicated in “Display example of the main unit.”
• If the TOC cannot be read, this is not processed as an error, and operation continues accordingly.
• If you design a new head unit, be sure to use one of the display formats indicated in “Display example of the main unit.”
The
2 high-order digits of an error code denote the main
classification, shown below.
0x: Servo-related errors
1x: Servo-related errors
3x: Servo-related errors
5x: Mechanism-related errors
classification, shown below.
0x: Servo-related errors
1x: Servo-related errors
3x: Servo-related errors
5x: Mechanism-related errors
How to restore from each error is shown below.
0x, 1x and 3x: ACC-OFF then ON, CD-OFF then ON, Disc ejection
5X: ACC-OFF then ON, Disc ejection, Disc reloading.
0x, 1x and 3x: ACC-OFF then ON, CD-OFF then ON, Disc ejection
5X: ACC-OFF then ON, Disc ejection, Disc reloading.
Error codes and connector descriptions
Software update
The software of this product is stored in IC671. Replace IC671 when making the version upgrade
of software.
Service mode: display
test mode
The
information such as the system microcomputer version is checked.
How to enter Test mode
Press
“ 1 ” and “ 3 ” keys simultaneously to start resetting.
Operation key: 1 + 3
Processing: Enter display test mode (2) Switch to next
test mode.
Test items and CD Test mode details
After
the [EJECT] key is pressed keys other than the [EJECT] key should not be
pressed, until disc ejection is complete. When the key [2] or [3] is pressed
during the Focus Search, the power supply should be immediately turned off
(otherwise the lens sticks to Wall, causing the actuator to be damaged).
100TR Jump, the mechanism shall be set to the Tracking Close mode when the key is released.
When the power is turned on/off the gain of the RFAMP is reset to 0 dB. At the same time all the self-adjusting values shall return to the default setting.
Do not do Tracking Servo Close before doing Focus Servo Close. (Because the over current flows)
100TR Jump, the mechanism shall be set to the Tracking Close mode when the key is released.
When the power is turned on/off the gain of the RFAMP is reset to 0 dB. At the same time all the self-adjusting values shall return to the default setting.
Do not do Tracking Servo Close before doing Focus Servo Close. (Because the over current flows)
Disassembly
CD adjustment
Cautions on adjustments
In this product the single voltage (3.3 V) is used for the regulator. The reference voltage is the REFO1 (1.65 V) instead of the GND.
If you should mistakenly short the REFO1 with the GND during adjustment, accurate voltage will not be obtained, and the servo’s misoperation will apply excessive shock to the pickup. To avoid such problems:
a. Do not mix up the REFO1 with the GND when connecting the (-) probe of measuring instruments. Especially on an oscilloscope, avoid connecting the (-) probe for CH1 to the GND.
b. In many cases, measuring instruments have the same potential as that for the (-) probe. Be sure to set the measuring instruments to the floating state.
c. If you have mistakenly connected the REFO1 to the GND, turn off the regulator or the power immediately. Before mounting and removing filters or leads for adjustment, be sure to turn off the regulator.
For stable circuit operation, keep the mechanism operating for about one minute or more after the regulator is turned on.
In the test mode, any software protections will not work. Avoid applying any mechanical or electrical shock to the mechanism during adjustment. The RFAGC and RFO signals with a wide frequency range are easy to oscillate. When observing the signals, insert a resistor of 1k ohms in series.
The load and eject operation is not guaranteed with the mechanism upside down. If the mechanism is blocked due to mistaken eject operation, reset the product or turn off and on the ACC to restore it.
In this product the single voltage (3.3 V) is used for the regulator. The reference voltage is the REFO1 (1.65 V) instead of the GND.
If you should mistakenly short the REFO1 with the GND during adjustment, accurate voltage will not be obtained, and the servo’s misoperation will apply excessive shock to the pickup. To avoid such problems:
a. Do not mix up the REFO1 with the GND when connecting the (-) probe of measuring instruments. Especially on an oscilloscope, avoid connecting the (-) probe for CH1 to the GND.
b. In many cases, measuring instruments have the same potential as that for the (-) probe. Be sure to set the measuring instruments to the floating state.
c. If you have mistakenly connected the REFO1 to the GND, turn off the regulator or the power immediately. Before mounting and removing filters or leads for adjustment, be sure to turn off the regulator.
For stable circuit operation, keep the mechanism operating for about one minute or more after the regulator is turned on.
In the test mode, any software protections will not work. Avoid applying any mechanical or electrical shock to the mechanism during adjustment. The RFAGC and RFO signals with a wide frequency range are easy to oscillate. When observing the signals, insert a resistor of 1k ohms in series.
The load and eject operation is not guaranteed with the mechanism upside down. If the mechanism is blocked due to mistaken eject operation, reset the product or turn off and on the ACC to restore it.
Test mode
This mode is used to adjust the CD mechanism module.
To enter the test mode.
[4] + [6] -> BUP + ACC ON
To exit from the test mode.
Turn off the ACC and back up.
Notes:
a. During ejection, do not press any other keys than the EJECT key until the loaded disc is ejected.
b. If you have pressed the key during focus search, turn off the power immediately to protect the actuator from damage caused by the lens stuck.
c. For the TR jump modes except 100TR, the track jump operation will continue even if the key is released.
d. For the CRG move and 100TR jump modes, the tracking loop will be closed at the same time when the key is released.
e. When the power is turned off and on, the jump mode is reset to the single TR (91), the RF amp gain is set to 0 dB, and the auto-adjustment values are reset to the default settings.
This mode is used to adjust the CD mechanism module.
To enter the test mode.
[4] + [6] -> BUP + ACC ON
To exit from the test mode.
Turn off the ACC and back up.
Notes:
a. During ejection, do not press any other keys than the EJECT key until the loaded disc is ejected.
b. If you have pressed the key during focus search, turn off the power immediately to protect the actuator from damage caused by the lens stuck.
c. For the TR jump modes except 100TR, the track jump operation will continue even if the key is released.
d. For the CRG move and 100TR jump modes, the tracking loop will be closed at the same time when the key is released.
e. When the power is turned off and on, the jump mode is reset to the single TR (91), the RF amp gain is set to 0 dB, and the auto-adjustment values are reset to the default settings.
Checking the grating after changing the pickup unit
The
grating angle of the PU unit cannot be adjusted after the PU unit is changed.
The PU unit in the CD mechanism module is adjusted on the production line to
match the CD mechanism module and is thus the best adjusted PU unit for the CD
mechanism module. Changing the PU unit is thus best considered as a last
resort. However, if the PU unit must be changed, the grating should be checked
using the procedure below.
Symptoms of Mal-adjustment:
If the grating is off by a large amount symptoms such as being unable to close tracking, being unable to perform track search operations, or taking a long time for track searching.
If the grating is off by a large amount symptoms such as being unable to close tracking, being unable to perform track search operations, or taking a long time for track searching.
Checking Procedure
1. In test mode, load the disc and switch the 3 V regulator on.
2. Using the right and left buttons, move the PU unit to the innermost track.
3. Press key 3 to close focus, the display should read "91".
1. In test mode, load the disc and switch the 3 V regulator on.
2. Using the right and left buttons, move the PU unit to the innermost track.
3. Press key 3 to close focus, the display should read "91".
Press
key 2 to implement the tracking balance adjustment the display should now read
"81". Press key 3. The display will change, returning to
"81" on the fourth press.
4. As shown in the diagram monitor the LPF outputs using the oscilloscope and check that the phase difference is within 75 .
4. As shown in the diagram monitor the LPF outputs using the oscilloscope and check that the phase difference is within 75 .
5. If the phase difference is determined to be greater than 75 try changing the
PU unit to see if there is any improvement. If, after trying this a number of
times, the grating angle does not become less than 75 then the mechanism should
be judged to be at fault.
Note:
Because of eccentricity in the disc and a slight misalignment of the clamping center the grating waveform may be seen to "wobble" ( the phase difference changes as the disc rotates). The angle specified above indicates the eaverage angle.
Hint
Reloading the disc changes the clamp position and may decrease the "wobble”
Note:
Because of eccentricity in the disc and a slight misalignment of the clamping center the grating waveform may be seen to "wobble" ( the phase difference changes as the disc rotates). The angle specified above indicates the eaverage angle.
Hint
Reloading the disc changes the clamp position and may decrease the "wobble”
