Car Audio System: November 2009

Sony CDX-M850 Stereo Code Entry

Sony CDX-M850

When you switch on the car radio the display will show [ SECURITY CODE INPUT ]
Open the front panel by pressing the left hand button on the fascia.
The display will show [ CODE IN 0000 ]
Press the [ + ] Button until you reach the first digit required then press the [ SEEK ] key to enter
Press the [ + ] Button until you reach the second digit required then press the [ SEEK ] key to enter
Press the [ + ] Button until you reach the third digit required then press the [ SEEK ] key to enter
Press the [ + ] Button until you reach the fourth digit required then press the [ SEEK ] key to enter
The clock will be displayed once finished.

Press the [ SOURCE ] key to switch the radio on.

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Now I will give you some details and characteristics about the Sony cdx m850 mp car radio :Without any buttons or controls to get in the way, the entire front panel becomes an exciting, full-motion fluorescent display with high-resolution graphics. In this mode, you use the supplied wireless remote to make all basic system changes.
Need to fine tune something? Push a button, and the faceplate motors down to reveal a smaller display and a full soft-touch control panel. Access the seven EQ presets and 7-band equalizer of Sony's EQ7 to adjust your sound.
The CDX-M850 will play your CDs, CD-Rs, CD-RWs, and even your long-playing MP3-encoded discs, while the top-of-the-line SSIR-EXA tuner locks in on stations near and far. If you love radio, add Sony's optional XM tuner and go wild with the innovative, diverse programming of XM Satellite Radio
If you need more entertainment the CDX-M850 will also control a Sony disc CD changer and you can hook up yet another source to the auxiliary input. Three sets of preamp outputs send a righteous 4-volt signal to any outboard amps in your system.
Details:

Active Black Panel motorized fold-down faceplate
full-motion fluorescent display
plays CDs, CD-Rs, CD-RWs, and MP3-encoded discs
CD/MD changer controls
EQ7 (7-band equalizer and 7 preset tone curves)
Dynamic Soundstage Organizer
SSIR-EXA tuner
18 FM/12 AM presets
seek tuning
XM Satellite Radio controls (XM subscription, optional Sony XM tuner, and antenna required to receive the satellite radio signal) — service is available only in the lower 48 states, not available in Alaska, Hawaii, or U.S. territories
4-volt front and rear preamp outputs
two 4-volt mono subwoofer outputs
high-pass and low-pass filters
CD text
displays 8 characters of XM Satellite Radio info
auxiliary input
wireless remote
clock
23.2 watts RMS/52 peak x 4 channels
CD frequency response 10-20,000 Hz
CD signal-to-noise ratio 90 dB
FM sensitivity 9 dBf
1-year warranty

If anyone have a problem with one of this SONY Models CDX-M500R , CDX-M600R , CDX-M700R And Possibly CDX-M800R, then hear is the solution :

Your car radio display : "CODE IN" but you can’t enter code from buttons. You need to solder three pins together on the underside of the main PCB to disable the code. These are accessible from under the radio so you don’t have to disassemble the unit. Look for an oversized vent hole below the white label.(view image)

You can also use the IR Remote control : SONY RM-X96 (view table instructions)

On the bottom of the unit is a window with three pair of contacts || || ||

Legend: O = Open Contacts , C = Closed Contacts.

TP3	TP2	TP1	code
O	O	O	Unknown
O	O	C	Unknown
O	C	O	Unknown
O	C	C	sound,mode,att,open (With the remote)
C	O	O	Unknown
C	O	C	menu,enter,mode,open (With the remote)
C	C	O	Unknown
C	C	C	No Code (Code Disabled)