KENWOOD Car stereo - KDC-5090B CD RECEIVER – Test mode – Security codes – Special display for tuner mode – Car audio repair and service

                                                 Category: Car Audio Repair and Service 

Contents of this article 

• How to access Test mode 
• EEPROM security code setting 

KENWOOD KDC-5090B

TEST MODE

How to enter the test mode
While holding the FM and Preset 6 keys, reset the unit.
How to exit from the test mode
While holding the Preset 6 key, reset the unit. (Note) The test mode cannot be terminated by ACC OFF, power OFF or momentary power down.
Initial status in the test mode
# Sources : ALL OFF
# Display : All segments are lit.
# Volume : -10dB (displayed as “30”)
# Loudness : OFF
# CRSC : OFF regardless of the presence of switching function.
# SYSTEM Q : Flat
Special display in Tuner mode
When any of the following messages is displayed in Tuner mode, the F/E may be abnormal.
# “TNE2P NG” : The EEPROM is set to the default (unstable values) because the F/E was shipped without passing through the adjustment process, etc.
# “TNCON NG” : Communication with the F/E is not possible.
Forced switching of K3I
Each press of the Preset 6 key in Tuner mode should switch
K3I from AUTO > Forced Wide > Forced Middle > Forced
Narrow > AUTO.
The initial status is AUTO and the display shows these
modes as follows.
# AUTO : FMA
# Forced Wide : FMW
# Forced Middle : FMM
# Forced Narrow : FMN

Test mode specifications of the CD receiver
# Forced ejection is inhibited in the reset start operation. When the unit is reset while a CD is loaded in it, the CD is not recognized by resetting.

# Each press of the Track Up key jumps to the following track numbers:
No. 9 > No. 15 > No. 10 > No. 11 > No. 12 > No. 13 > No. 14 > No. 9 (The cycle restarts from here.)
# Each press of the Track Down key jumps to the previous track number to the track being played.
Audio-related specifications
# A short press of the Q key initiates the audio adjustment mode.
# Pressing the ✽ key on the remote initiates the audio adjustment mode.
# Continuous holding of a remote control key is inhibited.
# Bass, Middle and Treble are adjusted in 3 steps of Min / Center / Max with the Track Up/Down keys.
# Balance is adjusted in 3 steps of Left Max / Center / Right Max with the Track Up/Down keys.
# Fader is adjusted in 3 steps of Rear Max / Center / Front Max with the Track Up/Down keys.
# HPF is adjusted in 2 steps of Through/220Hz with the Track Up/Down keys.
# LPF is adjusted in 2 steps of Through/120Hz with the Track Up/Down keys.
# Bass f, Bass Q, Bass EXT, Middle f, Middle Q and Treble f are not dealt with by the audio adjustment.
Menu-related specifications
# A short press of the CLK key initiates the Menu mode.
# Pressing the DNPP/SBF key on the remote initiates the Menu mode.
# Continuous holding of a remote control key is inhibited.
# Contrast is adjusted in 3 steps of 0/5/10 and the default is 5.
Backup current measurement
When the unit is reset while ACC is OFF (i.e. by turning Backup ON), the MUTE terminal goes OFF in 2 seconds in place of 15 second. (The panel and CD mechanism are not activated at this time.)

Security-related information Forced Power ON mode (All models)
Even when the security (Mask key) is approved, resetting the unit while holding the ATT and Preset 4 keys makes it possible to turn the power ON for 30 minutes. After 30 minutes have elapsed, it is not possible to return to the previous condition unless the unit is reset again.

Method of registration of the security code after EEPROM (Tuner Unit Ass’y) replacement (Code security model)
1) Enter the test mode. 
2) Press the CLK key to enter the security registration mode.
3) Enter the code using the Preset 1/2/3/4 keys. Example : To enter “3510”
# Press the Preset 1 key 4 times.
# Press the Preset 2 key 6 times.
# Press the Preset 3 key twice.
# Press the Preset 4 key once.
4) Hold down the DISP key for at least 3 seconds and the message, “RE-ENTER” appears, so once again enter the code according to Step 3) above.
5) Press and hold the DISP key for 3 seconds until “APPROVED” is displayed.
6) Exit from the test mode. 
(Note) All Clear is not applicable to the security code of this model.
Method of writing the Mask key while the EEPROM is in the initial status
1) Enter the test mode. 
2) Press the CLK key to enter the Mask key registration mode. “TRANSMIT1” should be displayed now. The display at this time should show “< >” in place of “ [ ] ”.
3) Point the Mask key remote toward the light sensor, and press and hold its key for more than 0.5 second.
4) When “TRANSMIT2” is displayed, press and hold the key on the Mask key remote for more than 0.5 second again. The first and second counter codes are not compared at this time.
5) When “APPROVED” is displayed, the write operation is complete. Now the demonstration mode is initiated and the test mode is terminated.
(Note) In the same way as previous models, if 30 minutes have elapsed with no code written, an error occurs and the power is turned OFF.

Method of initializing the Mask key (How to reset the unit from the Mask key approved condition to the factory condition)
1) Enter the test mode. 
2) “TRANSMIT1” is displayed and the Mask key entry request mode is initiated. The display at this time should show “** ” in place of “ [ ] ”.
3) Press and hold the key on the Master key remote for more than 3 seconds.
4) When “TRANSMIT2” is displayed, press and hold the key on the Master key remote for more than 3 seconds again.
5) When “APPROVED” is displayed, the Mask key is cleared, the demonstration mode is initiated, the test mode is terminated and the unit returns to the factory condition.
Method of clearing all Mask key-related data
1) Enter the test mode.
2) Press the CLK key to enter the Mask key registration mode. “TRANSMIT1” should be displayed now.
3) Point the Master key remote toward the light sensor, and press and hold its key for more than 3 seconds (until the level display shows the full condition).
4) When “TRANSMIT2” is displayed, press and hold the key on the Mask key remote for more than 3 seconds again. If “TRANSMIT1” is displayed in place of “TRANSMIT2”, restart the procedure from step 3).
5) When “APPROVED” is displayed, all security data is cleared and the unit returns to the condition before Mask key writing with the EEPROM in the initial status.