SU-HTB520EB, SU-HTB520EG, SB-HWA520EB, SB-HWA520EG, SC-HTB520EB, SC-HTB520EG, SU-HTB520EGK, SB-HWA520EGK - Panasonic Audio Service Manual (repair manual). Page 18

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This mode can be used during servicing.
1 : Checking the region/model.
2 : Checking the Main micro-p & HDMI micro-p firmware version.
3 : Wireless pairing.
4 : Wireless RF channel selection.
Here are the procedures to enter into service mode:
Step 1 : Power-up the main unit.
Step 2 : Press & hold [VOL-] on main unit, follow by [SUB-] & [SUB+] on remote control.
Note : All decorder LED (Dolby D, DTS, AAC/PCM) will blink 4 times followed by TV blinking. At this TV blinking, main uit is 

This unit is equipped with service mode function for:

Legend:
“O” means LED ON
“X” means LED OFF
“*” means LED blinking

Here are the procedures to check the region and main firmware version:
Step 1 : Power-up the main unit.
Step 2 : Enter into service mode. (Refer to Section 6.2 for the procedures).
Step 3 : Press [VOL+] on main unit one time to check for the region. (Refer to table 6-2 for information on the LED indication).
Step 4 : Press [VOL+] on main unit two time to check for the main micro-p firmware version no. (Refer to table 6-2 for information on
the LED indication).

Table 6-2

The region bit no. is to indicate the destination for model. (Refer to table 6-3 for more information).

Table 6-3

Press [VOL+] button on main 
unit for one time

*

X

Region Bit 2

Region bit 1

Region bit 0

Press [VOL+] button on main 
unit for two times

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

X

X

O

Europe

X

X

X

Oceania, Asia, South/Central 

America

X

O

X

JAPAN

O

X

X

US/Canada