Service manual

CD-DV999W/CD-DV777W
2 – 2
[3] DVD/CD section
1. DVD SECTION
• Adjustment
Since this DVD 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 performed
automatically. Therefore, playback of each disc can be performed
under optimum conditions.
Items adjusted automatically
1) Offset adjustment (The offset voltage between the head amplifier
output and the VREF reference voltage is compensated inside the
IC.)
* Focus offset adjustment
* Tracking offset adjustment
2) Tracking balance adjustment
3) Gain adjustment (The gain is compensated inside the IC so that the
loop gain at the gain crossover frequency will be 0 dB.)
* Focus gain adjustment
* Tracking gain adjustment
DVD/CD Error code description
*'CHECKING'
If Error is detected, 'CHECKING' will be displayed instead of 'ER-
CD**'. 'ER-CD**' display will only be displayed when error had been
detected for the 5th times.
[4] TEST Mode
1. TEST Mode Functions
1.1. Entering the TEST Mode
While holding down both the button and the X-BUSS button of the
main unit from the power-off state, press the POWER button to enter
the Test Menu Mode.
1.2. Test mode processing
• When entering the TEST Mode, the ROM version are displayed as
follows.
Version on the FL display: UD***** (****: Version No.)
1.3. TEST Mode button
• Press direct designation button during the version display to enter
the specified TEST Mode as shown below.
TEST MODE
1.4. Canceling TEST Mode
1. Press the POWER button in each TEST Mode to display
“CLEARAL” except SHIPPING TEST. Then reset and start.(Clear
RAM.)
2. It is necessary to play-off the A/C cord after “FINISHED” is dis-
played on the FL for SHIPPING TEST
2. Shipping TEST Mode
2.1. Outline
• ID command for initialization is sent to the DVD unit and E2PROM
in the unit is initialized.
• System Microcomputer and DVD changer initializerd
2.2. TEST Mode Operation
When entering the Shipping TEST Mode:
1. “WAIT” is displayed on the FL display.
2. “FINISHED” shall be kept displaying after Initiation is completed.
Manually play off the A/C cord to get out of the TEST Mode.
When lnitialization is failed, “INIT ERR” remains to be shown on the
FL display until play off the A/C cord.
2.3. Supplementary Note
1. When entering this TEST Mode, it is prohibited to press any key
until the above processing is completed.
3. DVD TEST Mode
3.1. Outline
• To send key codes of the TEST Mode 1 to the DVD unit to start the
TEST Mode.
• Thereafter the system’s microcomputer only sends key codes to
the DVD unit.
• The main unit operation is started in the same way as the normal
startup of the DVD/CD Function.
• Only monitor (video) output is normally controlled. “MUTE ON”
remained.
• During this TEST Mode, “DVD TEST” is shown on the FL display
and change to “DVD ****” (****: DVD version).
(Display is shown by OSD. Main unit display not available.)
3.2. TEST Mode Operation
1. The TEST Mode is started in the same way as the normal startup of
the DVD/CD Function. Then the DVD unit is normally started. Dur-
ing the TEST Mode, “DVD****” is continuously displayed.
Error Explanation
10* CAM error. Can't detect CAM switch when CAM is moving.
11* When it detect cam operation error during initialize pro-
cess.
20* TRAY error. Can't detect TRAY switch when TRAY is mov-
ing.
21* When it detect TRAY operation error during initialize pro-
cess.
30 When it change to DVD/CD function, DVD cannot read ini-
tial data.
No. TEST Mode Direct Designation Button
1 SHIPPING TEST open/close
2 DVD TEST DVD/CD
3 DVD DISPLAY TEST disc 2