K2 AGC off problem
Locked
 
|
Hi Elecrafters,
When I turn the AGC to off pushing pre/att and agc together, the display reads "off", but the audio mutes and s-meter goes to maximum . I reheated the solderings on U1 C10 and D2. Voltage on U1 pin 2 is 1.44V when agc slow or fast and 0.52V when agc is off The other side of D2 , the /AGC OFF signal is 5.0V when agc slow or fast and 0.004V when agc is off. Anyone an idea ? joe on5ao K2#5237 __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
|
|
Hi Joe:
Sounds exactly like the problem I had with 5196. The problem was fixed by replacing X1 on the Control Board. You will probably find that CtrlBd-U2-1 goes to about 6 volts when you turn the AGC OFF virtually shitting down the IF amplifier. I encourage you to communicate with Gary ([hidden email]) regarding this problem. Yesterday, someone reported a similar problem with a close serial number(s/n5219). 73, Ken K3IU -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of jo benoit Sent: Monday, February 27, 2006 12:00 PM To: elecraft mailman qth Subject: [Elecraft] K2 AGC off problem Hi Elecrafters, When I turn the AGC to off pushing pre/att and agc together, the display reads "off", but the audio mutes and s-meter goes to maximum . I reheated the solderings on U1 C10 and D2. Voltage on U1 pin 2 is 1.44V when agc slow or fast and 0.52V when agc is off The other side of D2 , the /AGC OFF signal is 5.0V when agc slow or fast and 0.004V when agc is off. Anyone an idea ? joe on5ao K2#5237 __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
|
|
Obviously, I meant "shutting" down :-(.
Also, Joe, I should mention that you should check and double check component placement and value as well as check all solder joints. 73, Ken K3IU -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Ken K3IU Sent: Monday, February 27, 2006 1:40 PM To: 'jo benoit'; 'elecraft mailman qth' Subject: RE: [Elecraft] K2 AGC off problem Hi Joe: Sounds exactly like the problem I had with 5196. The problem was fixed by replacing X1 on the Control Board. You will probably find that CtrlBd-U2-1 goes to about 6 volts when you turn the AGC OFF virtually shitting down the IF amplifier. I encourage you to communicate with Gary ([hidden email]) regarding this problem. Yesterday, someone reported a similar problem with a close serial number(s/n5219). 73, Ken K3IU -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of jo benoit Sent: Monday, February 27, 2006 12:00 PM To: elecraft mailman qth Subject: [Elecraft] K2 AGC off problem Hi Elecrafters, When I turn the AGC to off pushing pre/att and agc together, the display reads "off", but the audio mutes and s-meter goes to maximum . I reheated the solderings on U1 C10 and D2. Voltage on U1 pin 2 is 1.44V when agc slow or fast and 0.52V when agc is off The other side of D2 , the /AGC OFF signal is 5.0V when agc slow or fast and 0.004V when agc is off. Anyone an idea ? joe on5ao K2#5237 __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
«
Return to Elecraft
|
1 view|%1 views
| Free forum by Nabble | Edit this page |