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Article #16396

Re: TV tuner help wanted

#16396
From: Barry Fowler
Date: Tue, 05 Jan 1993 21:12
18 lines
1086 bytes
Yes.

try Howard Sams Schematics 1-800-428-7267.

As for what's wrong with the set, if the raster is just plain blank on
VHF only, it's probably the oscillator (transistor) as there is a common
RF amp. transistor used for both UHF and VHF.  One other remote possibility
is the "B+ voltage" provided to the VHF tuner but in about 12 years of 
repairing TVs, I've seldom seen a fault in this circuit.

When working on VHF tuners, do not move any parts or bend any leads or
it will detune the tuner, perhaps out of the range of its fine tuning.
Keep all leads on replaced components SHORT as you're working in a very
sensitive high frequency circuit.

Have fun,

barry
Technical Details
Message-ID: <7480161@hpfcso.FC.HP.COM>
Path: arc1-ca.pugleaf.net!sparky!uunet!cs.utexas.edu!zaphod.mps.ohio-state.edu!sdd.hp.com!hpscit.sc.hp.com!hplextra!hpfcso!barryf
References: <20580@ucdavis.ucdavis.edu>

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From: barryf@hpfcso.FC.HP.COM (Barry Fowler)
Date: Tue, 5 Jan 1993 21:12:39 GMT
Subject: Re: TV tuner help wanted
Message-ID: <7480161@hpfcso.FC.HP.COM>
Organization: HP Colorado Computer Mfg. Operation
Path: arc1-ca.pugleaf.net!sparky!uunet!cs.utexas.edu!zaphod.mps.ohio-state.edu!sdd.hp.com!hpscit.sc.hp.com!hplextra!hpfcso!barryf
Newsgroups: sci.electronics
References: <20580@ucdavis.ucdavis.edu>
Lines: 19