JVC KW-AVX810J Service Manual page 32

4.6.4 Service mode 4
Keep this state more 2 seconds
while continuing pressing the
[MENU or TP/PTY] button, [VOLUME +]
button and TOUCH PANEL [DOWN]
button sequentially.
Screen indication
SERVICE MODE 4
RDS S MODE
MONITOR S MODE
HD RADIO S MODE
1-32 (No.MA403<Rev.001>)
Exchanging it operate s menu of a service mode with the [UP] button
and [DOWN] button. Operate choice of a menu with a [PLAY/PAUSE] button.
RDS S MODE
RDS service mode
MONITOR S MODE
R/W CHROMA
DATA CLEAR
HD RADIO S MODE
It is displayed in HD Radio unit connection.
*See "Monitor adjustment" for details.
CHROMA DATA read/write
Clear of CHROMA DATA (return to an initial value)