JVC KW-V11E Service Manual page 28

4.3.3.10 Sirius XM CHECK MODE
Mode for check of Sirius XM terminals.
By using the audio output from the internal oscillator of SXV100,
it is possible to check all of the power lines / communication lines
/ audio line.
[L] key: Output to the L Channel voice of the internal oscillator.
Each time the key is pressed, the audio ON → OFF is switched.
[R] key: Output to the R Channel voice of the internal oscillator.
Each time the key is pressed, the audio ON → OFF is switched.
[OK] key / [NG] key: OK display when the audio output has suc-
cessful.
NG display when the audio output has failed.
4.3.3.11 OPENING / ING CUSTOMIZE
Mode for customizing for DOP at the production line.
4.3.3.12 CHANGE INITIAL PARAMETER
Mode for customizing for DOP at the production line.
4.3.3.13 STEERING REMOTE CUSTOMIZE MODE
Mode for customizing for DOP at the production line.
4.4 DC Offset error description
4.4.1 DC Offset detection circuit design
• Purpose:
To prevent breakdown, when occur DC offset between speak-
er output "+" and "-".
• Target:
Detect DC offset, then stop the Power Amp operation and shift
to specified condition.
4.4.2 Possible causes of DC offset at speaker output lines
(1) Mis-connection for Speaker output for example touch to car
body or battery line.
(2) Current leak of coupling capacitor for Power IC input.
(3) Current leak of AC-GND capacitor for Power IC AC-GND.
(4) Capacitor shorted of above parts due to foreign object.
C-tc
Win_TC
4.4.3 Type of checking
4.4.3.1 To detect DC Offset Error
• Mis-connection
- Short any one speaker out line to GND or Vcc
• Capacitor leak
- Parallel 330kΩ to either any one of coupling cap or AC-GND
capacitor (to simulate current leakage of capacitor)
- Shorted either any one of coupling capacitor or AC-GND ca-
pacitor.
4.4.4 Detection Timing chart
2.0sec or more
PWIC_STBY
PWIC_MUTE
AUD_MUTE
(No.MA601<Rev.001>)28/30
E-Vol
C-in
C-in
C-in
C-in
C-ac1 C-ac2
Sw5V
R2
R1
Win_In
C3
R3
DC Error
1.5sec or more
0.7sec or more
0.8sec 1.0sec
Missconnect
Capacitor leak Other (miss detection etc.)
detection period
detection period detection period
Audio Pwr Amp
In 1
In 2
In 3
In 4
AcGnd
Offset Detect
Out
Micon
R4
ADC In
50ms
or more