JVC KD-R491 Schematic Diagrams page 38

4.2.7 Tuner Test Mode Specification
The following display shall be indicated according to the TUNER status.
Status
TUNER IC
Communication Error
T
RDS Specified
data reception
R
Item Operation
TUNER IC display EQ
*Not applicable and no function for HD and DAB models
4.2.8 USB Test Mode Specification
Applicable for iPod model only.
Status
iPod IC Mount Verification Status
Display
Display content
U N C O N N
D S T E S T
Display content
A T 2 * *
Display content
i P o d
(No.MA665<Rev.001>)19/33
Communication to TUNER IC not available
(indicated unless the mode is in Clock Display Mode).
G
Turn OFF P-CON forcibly if PS=RDS TEST is received.
P-CON recovers with Power OFF/ON.
Display TUNER IC version
'AT2 ********' is eg "AtomIC2 57V1B101" indicating
"AtomIC2 TEF6657V1B 1.01"
Display HD BBP(IDM) firmware version.
* * * * * * @: (E)ngineering or (C)ommercial Release
#: Major Version number
%%%: Minor version number
**: Customize version number
## = Blank: Verifying
NG: IC not mounted
**: Non iPod support model
Upon source change to USB source or USB
device plug in:
Verifying: Show "iPod: ##"
NG: Always show "iPod: NG" even during "NO
DEVICE" or playback.
**: Always show "iPod: **" even during "NO
DEVICE"
: # # OK: Change back to nomal display ("NO DE-
VICE / normal playback display).
In addition, upon enter to this mode, P-CON is
turned ON.
When a judgment result is OK, P-CON is
turned off.
Upon exit, P-CON still remain OFF.
When a judgment result is NG, P-CON is kept
ON condition.
Upon exit, P-CON still remain ON.
Details
Details
Details