[TechAssist] Re: Zenith SD2743, 9-387-6, Tuner muted
- From: "Ray Lones" <rlones@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 16 May 2005 13:06:17 -0400
c1207 just seems to be a 1500 pf cap pin 5 to ground. Pin 5 labled rst.
Reset? IC 1201 seems to be straight deflection. Have you poked around ic
6022 tuner interface?
1 2.5v
2 0
3 0
4 5
5 .2
6 12.3
7 12
8 12.3
9 0
10 31
11 4.9
12 4.9
13 0
14 n/c
15 gnd
16 10.4
17 31.8 current source
18 gnd
Alarie's TV
1300 North Ave.
Burlington, VT.
----- Original Message -----
From: "peter kowalik" <pe.kow@xxxxxxxxxxxx>
To: "Techassist@xxxxxxxxxxxxx" <techassist@xxxxxxxxxxxxx>
Sent: Sunday, May 15, 2005 6:30 PM
Subject: [TechAssist] Zenith SD2743, 9-387-6, Tuner muted
> Hello all, Have set in shop, yes it's an oldie, one of the original
> digital
> sets from Zenith. Main board is a 9- 5xx, predates the 9-700 series of
> digital boards. Originally set came in for intermittent tuner,soldered the
> living snott out of the 2 boards, the main board and the IF and audio
> board.
> Everything seemed to be fine. Couple of weeks later, intermittent tuner
> again. Went over everything again, let play for about a week in shop,
> tapping, rapping and otherwise trying to embarrass set into acting up.
> everything fine, deliver again, worked about 3 weeks this time and , hold
> on, intermittent tuner. Back to the old shop, checking 9-387 board, seemed
> to be int at processor IC, which was socketed. making an assumption
> similar
> to what we experienced a long time ago with Tosh and socketed IC's (int
> sound, pix etc.), removed IC socket. Couldn't insert IC into holes because
> of a cap that was installed into a slot in the board under the socket.
> This
> cap C1207 a 1500 pf cap looked like a piece of board with some print on
> it,
> cracked and fell apart when we tried to remove it. We replaced it with a
> disc cap of the correct value, soldered to the underside of the board.
> From
> that time on we have had a "Tuner Muted" situation, ie no signal, just
> snow.
> Is the physical position of this cap important (against base of IC), is it
> type specific or has anyone run into a Tuner Muted symptom with a 387
> board
> before. Open to suggestions, prefer not to require use of firearms or
> large
> blunt instruments. Set was actually an extremely good set in its day and
> still gave a very good picture when it was working. Thanks to all Peter
> Kowalik pe.kow@xxxxxxxxxxxx keith@xxxxxxxxxxxxxxxx Keiths Stereo
> Burl ON
>
>
>
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