Denon RCD-M39 Service Manual page 39

(15) Connect the RS-232C on the DATA UPDATE KIT and the Serial Port of windows PC with RS-232C cable.
(16) Connect the 7P FFC to the rear panel of the unit from DATA UPDATE KIT.
Caution : A FFC pin has the connection direction.
Refer to the photograph.
For updating the USB microcomputer
(17) Connect the mains cord into the unit.
(18) Press the "Power operation ( X )" button to turn on the unit.
(19) Double click FlashProg_b35.exe, and launch the Flash Programmer again.
(20) The Flash Programmer communicates automatically.
When communication succeeds between a unit and a program, a dialog box saying "Erase All data in this device?
(Y/N)" appears.
Click Yes.
This side is contacts of 7P FFC.
7P FFC
S706-709 LOW
PC
39
S702 5V