echo:	drake
to:	All
from:	`David Austin`
date:	2004-02-11 17:54:32
subject:	02:[drakelist] Re: Relay not pulling in (TX4C)
From: "David Austin" Subject: [drakelist] Re: Relay not pulling in (TX4C) ----- Original Message ----- From:=20 David">mailto:d.austin{at}minerva.screaming.net">David Austin To: Drakelist">mailto:drakelist{at}www.zerobeat.net">Drakelist Sent: Wednesday, February 11, = 2004 9:28=20 PM Subject: Relay not pulling in=20 (TX4C) Hi all, Another plea for help! I have = replaced relay K1=20 with a 2.5K solenoid as per the updated T4XC circuit, as I discovered = the old=20 relay (old 15k solenoid version) to be open circuit. Of course I = also=20 added the necessary 1.5K resistor in series. All as per advice from = Garey - K4OAH (for which many thanks = Garey). Now, when I go into tune mode, the = relay will not=20 pull in. There is only 30V across the solenoid, and should be nearer = 40V I=20 believe from my calculation (assuming plate resistance =3D = 11.5K). I=20 suspect the VOX control tube is not conducting fully. Voltages (in = Tune mode)=20 on V10 are as follows: Pin 6 plate: = 215v (manual=20 says 170v) Pin 7 grid: -2mV = (manual says=20 -100mV) Pin8 cathode: +880mV (manual = says=20 -660mV) R70 measures spot on = 82ohm Have checked all outputs on AC4 and = these all=20 seem to measure fine. Any thoughts on where to look for = likely problem?=20 Could diodes CR13 or CR14 have blown and if so, what would be effect? = Could=20 anything have been taken out when the solenoid blew (can't see = anything=20 vulnerable) or could the solenoid originally have blown due to failure = of=20 other components in this area? Hoping someone might give some=20 pointers! 73 to all David G4GTP ------=_NextPart_000_0124_01C3F0F2.038203B0-- ---------------------------------------------------------------------- Submissions: drakelist{at}www.zerobeat.net Subscribe: majordomo{at}www.zerobeat.net - subscribe drakelist in body Unsubscribe: majordomo{at}www.zerobeat.net - unsubscribe drakelist in body Hopelessly Lost: majordomo{at}www.zerobeat.net - help in body of message Brought to you courtesy of TLCHost.net http://www.tlchost.net/ ---------------------------------------------------------------------- --- * Origin: The Barter Board Internet Gatway (1:261/1551) SEEN-BY: 633/267 270 @PATH: 261/1551 1352 38 123/500 106/2000 633/267
SOURCE: echomail via fidonet.ozzmosis.com

Subject: Relay not pulling in=20 (TX4C) Hi all, Another plea for help! I have = replaced relay K1=20 with a 2.5K solenoid as per the updated T4XC circuit, as I discovered = the old=20 relay (old 15k solenoid version) to be open circuit. Of course I = also=20 added the necessary 1.5K resistor in series. All as per advice from = Garey - K4OAH (for which many thanks = Garey). Now, when I go into tune mode, the = relay will not=20 pull in. There is only 30V across the solenoid, and should be nearer = 40V I=20 believe from my calculation (assuming plate resistance =3D = 11.5K). I=20 suspect the VOX control tube is not conducting fully. Voltages (in = Tune mode)=20 on V10 are as follows: Pin 6 plate: = 215v (manual=20 says 170v) Pin 7 grid: -2mV = (manual says=20 -100mV) Pin8 cathode: +880mV (manual = says=20 -660mV) R70 measures spot on = 82ohm Have checked all outputs on AC4 and = these all=20 seem to measure fine. Any thoughts on where to look for = likely problem?=20 Could diodes CR13 or CR14 have blown and if so, what would be effect? = Could=20 anything have been taken out when the solenoid blew (can't see = anything=20 vulnerable) or could the solenoid originally have blown due to failure = of=20 other components in this area? Hoping someone might give some=20 pointers! 73 to all David G4GTP ------=_NextPart_000_0124_01C3F0F2.038203B0-- ---------------------------------------------------------------------- Submissions: drakelist{at}www.zerobeat.net Subscribe: majordomo{at}www.zerobeat.net - subscribe drakelist in body Unsubscribe: majordomo{at}www.zerobeat.net - unsubscribe drakelist in body Hopelessly Lost: majordomo{at}www.zerobeat.net - help in body of message Brought to you courtesy of TLCHost.net http://www.tlchost.net/ ---------------------------------------------------------------------- ---