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car audio philips business rds 'PHONE'displayed

 
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wibowo_tri



Joined: 03 Feb 2008
Posts: 2
PostPosted: Mon Feb 04, 2008 11:56 pm    Post subject: car audio philips business rds 'PHONE'displayed Reply with quote
hi,anybody can help me?
my friend give me his unknown code car audio,and many thx to tmcu [you are g8!]
the problem now,on display screen, come out 'PHONE'
and there is nothing i can do to on the radio nor cassete Sad
i check the pin out, for pin 4 [telephone muting] is not connected,it has 6,6 vdc.
my firend said,if 'PHONE' displayed,pin 4 is connected,so why??

some body help pls...
thx for advance
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torbjorn



Joined: 07 Jun 2007
Posts: 370
Location: Sweden
PostPosted: Tue Feb 05, 2008 8:47 am    Post subject: Reply with quote
Perhaps, the car stereo's internal circuitry connected to the phone muting pin is defective in some way. For example, because of an external wrong connection or short circuit, or due to ESD damage. Check out the service manual and schematic for the unit to see if this can give any clues. If there is any complex IC directly connected to this pin, check out its datasheet too.
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wibowo_tri



Joined: 03 Feb 2008
Posts: 2
PostPosted: Tue Feb 05, 2008 11:54 pm    Post subject: Reply with quote
torbjorn wrote:
Perhaps, the car stereo's internal circuitry connected to the phone muting pin is defective in some way. For example, because of an external wrong connection or short circuit, or due to ESD damage. Check out the service manual and schematic for the unit to see if this can give any clues. If there is any complex IC directly connected to this pin, check out its datasheet too.


thx torbjorn,
unfortunately i,ve no schematic diagram for it nor in this forum,so i cannot examine or solve it,but i'll try more
if someone has,plz give me...
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be_cek
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PostPosted: Mon Feb 11, 2008 8:58 pm    Post subject: Re: Reply with quote
wibowo_tri wrote:
torbjorn wrote:
Perhaps, the car stereo's internal circuitry connected to the phone muting pin is defective in some way. For example, because of an external wrong connection or short circuit, or due to ESD damage. Check out the service manual and schematic for the unit to see if this can give any clues. If there is any complex IC directly connected to this pin, check out its datasheet too.


thx torbjorn,
unfortunately i,ve no schematic diagram for it nor in this forum,so i cannot examine or solve it,but i'll try more
if someone has,plz give me...


Hii..have u solved the problem yet ?!
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