JVC KD-R491 Schematic Diagrams page 37

4.2.2 Mode structure
The following table shows the test modes that can be accessed from the different sources in Production Test Mode.
Source
Tuner TUNER Test Mode
USB USB Test Mode
*These mode are able to transit to Version Display Mode at all sources by pressing [RETURN] key until all LCD lights up.
4.2.3 Mode content
Syscon shall display the following information after entering Production Test Mode.
Display content
4.2.4 Special Operation by Key Input
Behaviour
Volume Adjustment to 33
Only during Normal display
(Invalid during Menu)
4.2.5 How to transit to Version Display Mode
Item Operation
Transit to Display
RETURN
Mode
4.2.6 Version Display Mode
Item Operation
All Lights ON/
TEST
Syscom version
display
Stage Setting
Serial No. display
DISP
(Toggle)
iPod IC Mount
Verification Status
Display
(USB models
only)
Pre-out Switch
(1 Pre-out / 2 Pre- EQ
out model only)
SOURCE
Mode release
Transition
Mode release RETURN
Test mode
All lights on (BOTH LCD & LED including dual color switchable)
Set should not be able to power on if sub clock is not functioning.
The display is released when another operation is executed.
Pressing and holding [DISP] key, press [] key for 0.5 seconds.
(Starting to press [DISP] key and [] key at the same time can not be entered into
the mode)
Display content
Display content
S Y S # # – @ @
S T A G E 2 1
S N * * *
i P o d
L / O
(No.MA665<Rev.001>)18/33
Details
Details
Transit to Version Display Mode
(Default status: All Lights ON)
All lights ON
## = File Number
@@@ = Syscon Version Number
@
##: Stage Setting for current hardware
# #
Serial No. Display (8 digits)
Display to support ASCII characters
* * * * *
********: Blank
@@@@@@@@: EEPROM Read Error
## = Blank: Verifying
OK: IC mounted
NG: IC not mounted
**: Non iPod support model
In addition, upon entering this mode, P-CON is
: # # turned ON.
When a result is OK, P-CON is turned off.
Upon exit, P-CON remains OFF.
When a result is NG, P-CON is kept ON condition.
Upon exit, P-CON remains ON.
Switch Pre-out with toggle
S U B . W
Return to Normal mode
Return to Normal mode
Details
Details