Dc Offset Error - Kenwood KDC-BT7539U Service Manual

2. Press the [FNC] key briefl y to make the multi-function
display and press the [
MENU.
When "Security" is displayed, press [ ] key for 1 sec-
ond or longer to enter the security registration mode.
3. Enter codes with the operation knob in the right side
or with the [FM] / [AM] and [
CW rotation of the operation knob, [FM] key: number
up
CCW rotation of the operation knob, [AM] key: number
down
[ ] key : cursor to right
[ ] key : cursor to left
4. After inputting the code, press [ ] key for 3 seconds
or longer which causes "RE-ENTER" to be displayed.
This is for "confi rming" the code. Use the method in
the step 3 to re-enter the code.
5. Then, press [ ] key for 3 seconds or longer, which
will display "APPROVED". This completes the security
code registration
● Purpose
Prevent customer's vehicle speakers damages, burnouts,
and smoking.
Avoid the connected speakers to be burned out, dam-
aged, or to smoke when DC occurs between the audio
power amp. + and - outputs.
● Processing after detection
• System status
• At the detection of DC error, error data is to be saved im-
mediately (E2PROM error log save area).
• Display the error message on the display. The system
shall maintain the current condition, including the opera-
tion. Shut down audio system power supply. Set Mute to
ON.
TEST MODE
] key briefly to enter the
] / [ ] keys.

DC OFFSET ERROR

KDC-BT7539U/BT8041U
/BT8141UY/BT838U
6. Release the test mode. (Refer to "How to clear the test
mode".)
∗ Note: All clear cannot be used to clear the security
code.
• How to clear the programmable security code
(Simple security models)
1. While "_ _ _ _" is being displayed, press [ ] key for 3
seconds or longer while pressing the [AUTO] or [TI] keys.
(This makes the "_ _ _ _" display disappear.)
2. Input "KCAR", using the remote controller.
Press [5] key of the remote controller 2 times (Input for "K")
and press [ ] key.
Press [2] key of the remote controller 3 times (Input for "C")
and press [ ] key.
Press [2] key of the remote controller once (Input for "A")
and press [ ]key.
Press [7] key of the remote controller 2 times (Input for "R")
and press [ ] key.
3. The security is cleared and the unit enters STANDBY
mode.
4. If wrong codes are input, "_ _ _ _" will be displayed
again.
• Although switching between Power OFF and ON (ACC,
BU, and Key operation) is valid, switching from Off to ON
shall be error until the μ-com is reset.
∗ While power-on, even if the IC2VI DCErr output termi-
nal logic recovered to normal level value, the error con-
dition shall continue.
• Prohibit to save the backup/installer memory to E2PROM
(nonvolatile memory).
● Controlling μ-com terminal
• Set Mute for all channels including for pre-out.
• Turn off power IC control system power supply. (Set
AMP-Standby function to valid)
• Set P-Con output to OFF (Logic by which external AMP
unit is turned off).
21