Kenwood KDC105, Kenwood KDC126, Kenwood KDC126S – factory reset, service mode and adjustments, circuit diagram

How to enter test mode
While holding the FM key and preset 6 key and reset the unit.  All display segments light up when the test mode is entered.
How to exit from test mode
Reset the unit.
Turning ACC off, power off, momentary power down or panel detaching does not terminate the test mode.

Test mode specifications of CD receiver
* Pressing the Track Up key skip to tracks in the following sequence:
No.9  No.15  No.10  No.11  No.12  No.13  No.14
 No.9 (repeats the cycle)
* Pressing the Track Down key skip to the track immediately before the track being played.
* Pressing Preset 1 key skip to track No. 28.
* Forced ejection is not provided.

Audio functions
* Pressing the AUDIO key or the “*” key on the remote controller initiates the Audio adjustment mode.
* In the Audio adjustment mode, the Seek Up/Down keys on the remote controller can only be pressed shortly. (They cannot be held depressed.)
* The volume is -10dB (which is displayed as “30”).
* LOUDNESS is OFF.
* The Bass/Treble Up/Down and Balance/Fader Up/Down buttons function as full-boost/full-cut and full-front/full-rear respectively.

Menu mode (for 14segment model)
* Pressing the CLK or the DNPP key on the remote controller initiates the Menu mode.
* In the Menu mode, the Seek Up/Down keys on the remote controller can only be pressed shortly. (They cannot be held depressed.)
* With the models incorporating RDS, the first operation in the menu becomes local seek.

Version and operating hours display
* The following table shows the key operations and resulting display information.

* Holding Preset 3 while the operating hour information is displayed clears it.
* Holding Preset 5 while the ejection count information is displayed clears it.

Adjustment Mode

 Adjustable items

1 : Stereo Decoder Sub address : 9

2 : Configuration Sub address : D

3 : Stereo decoder Adjustment Sub address : E

4 : Hi-Cut Sub address : C

5 : Field strength control Sub address : B

* Default values

If they are not written in the EEPROM, the default values specified are set in IC10.

Circuit diagram [Schematic] (Click on the pictures to magnify)

Adjustment procedure

1. Enter the IC10 Adjustment mode by resetting the unit while holding preset 3 key + preset 6 key.

2. Select the TUNER source by pressing SRC.

3. When the adjustment mode is entered, the display shows 2-digit hex number.

4. When preset 1~5 is recalled, the setting values corresponding to the pressed number are displayed. (The displayed values are those in the RAM.)

5. Vary each setting value using |<< and >>| key.

6. Store the values in the corresponding preset number.

7. The settings can be performed individually for each item.  (It is not required to store all the values together.)

8. After storing the values, reset the unit to exit from the adjustment mode. The values set in the EEPROM will be read during the resetting.

9. When the band is switched, there may be cases in which the preset number being displayed does not coincide with the stored setting value. To check this, be sure to recall the

preset number after you switch the band.

Notes
1. The items that are not stored will be set to the default values.
2. Once a value is stored in memory, the value will always be used later.
(It is not allowed to modify the setting values by switching the destination type.)