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infinity 3100 issues

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Ex Member
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Aug 23rd, 2008 at 7:51pm  
Hello

I have a 3100 series modem, with a good option files but my modem still not  RX lock .

When i use another modem with the same option file  this one   have RX lock .


I have reload  packages  and option file  but   it stil not lock ,  on it output i have the LNB  18V and   10 MHz .

Someone can tell me please what can i do for it please

thanks
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Ex Member
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Reply #1 - Aug 23rd, 2008 at 10:34pm  
If you are absolutely certain that the same options file works on one and not the other (and they are the same software version), my best guess would be that the DEMOD is bad on modem that will not lock.  

Rationale: the center freq is common on both modems.  If the IF/RF chain is the same (read: you swapped the suspect modem for the good modem and used the same RFT components), then your issue points to hardware issues (on the Rx side of the modem itself).

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« Last Edit: Aug 24th, 2008 at 1:10am by N/A »  
 
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Eric Johnston
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Reply #2 - Aug 23rd, 2008 at 11:18pm  
Are the modem RX F connector socket internal capture springs good ? Check by gently inserting a test length of centre pin wire.  The internal springs may be burned, corroded or physically damaged.  The diameter of F connector centre pin wire is not a specified standard and if larger diameter wire has been used before a new narrower wire may fail to make contact due to spring stretch.   Does a DC voltage appear at the modem RX F socket ?

Was the F plug put in properly ?  Is the centre pin marginally short ?    It should stick out proud of the plug rim by about 1.5mm.   Is the braid reliably connected ?

Did the LNB change temperature and thus LO frequency change also when the modems were swapped ?  Does widening the frequency search range help ?

18V and 10 MHz were mentioned above.  Why ?  Are the options files the same or different in these respects ?  If the LNB 10 MHz reference is on, why ?  Very few LNBs need external 10 MHz reference.  It is possible for PLL LNBs with external references to have intermittent synth lock fault.  Cycle the power several times and try waggling cables and knocking the LNB to see if you can make it fail/work.  Some LNBs will change LO frequency with 13/19 volts.

As Mike says, the receiver/demod may be faulty.

Best regards, Eric
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Ex Member
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Reply #3 - Aug 25th, 2008 at 1:55pm  
Hello
  If we replace the option file and/or package of locked modem with one unlock, is this remove the lock?

  Where the data saved (in the option file or package) whene lock the modem? i.e. if we change the option file or package we eliminate the lock.
  Thanks to all
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Ex Member
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Reply #4 - Aug 25th, 2008 at 7:19pm  
Do not confuse rlock with RX lock.  They are two very different things.
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Ex Member
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Reply #5 - Aug 26th, 2008 at 5:31pm  
Ok good, I talk about rlock?
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