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SONY XR500 - XR800

SONY Model no. CDX-M500R , CDX-M600R , CDX-M700R
And Possibly CDX-M800R
IR Remote : SONY RM-X96
On the bottom of the unit is a window with three pair of contacts || || ||
Legend:
|| = Open Contacts
N = Closed Contacts
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TP3 TP2 TP1 (code)
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|| || || Unknown
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|| || N Unknown
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|| N || Unknown
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|| N N sound,mode,att,open
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N || || Unknown
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N || N menu,enter,mode,open
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N N || Unknown
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N N N No Code (Code Disabled)
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XR-M500 up to 700