Nolannniah
Active Member
Hi all,
This is my first post, and did some extensive reading and followed a few posts instructions. There are some very knowledgeable people here at AK.
I’ll start from the top:
Had no sound and no relay engagement, did some troubleshooting.
Removed the PPs, after, I could not get good steady readings on them. Tested one at a time-Voltage vs. shorts etc…Found that one of the packs were bad. To double check, I reinstalled the “good” one. Got relay pop and output. SO, ordered new ones. Very hard to find from a good source, I might add-still don’t know if mine are up to par yet. Have not tried to push them above 10w yet…Then I noticed that my 2 channel meters were not producing the same output and was slightly noticeable in the speakers. Read up a little more-did the DC adjustments/readings checked at 10, 30 and 60 intervals, then checked again in 2 hours. Good there, but still have the slight power level drop. I hooked up an external input to listen to some music (via RCA cables). When, I switched over to Tape Monitor, heard a loud POP through the speakers. Ok, no big deal (came across a “how to” post on cleaning procedures on switches and stuff), read up, followed instructions and cleaned all. Then went to try it all again. Have the same issue. Cleaned a second time, had the same results.
Steps I have taken: Re-soldered switch joints, switched inputs (RCA source), switched RCA cables (cleaned in and outside of the RCA inputs on the unit), switched speaker ports (A & B), AND still have same issue. This is no doubt what caused one of the packs to blow. When this happens (if volume is turned down or slightly up-no difference), it causes the meter reading needle to almost “tap-out” on the other side (when this happens relay disengaged then back on). If I slowly guide the switch to the other position, all works well. Just when you flip the switch down/up (like you would do for normal operation-I’m not slamming them down/up), it does this. I have noticed when it flips down/up a little harder the pop sound is noticeably louder. This issue occurs on all flip switches (except the Loudness one)-Mode (Stereo/mono), Tape 1 & 2, Low Filter, and FM Muting switches.
Also would like to note that the 3 in a row transistors w/heat sinks (Q25, Q19 & Q20), they were all touched up with new solder. Although, Q20 (the one closest to the front of the unit) is the one getting pretty warm vs. the rear one (and looks like it has been for a while-not from my repair I’ve been working on). Also, the resistor (R323, 2.4kOhm @1W) in front of Q20 is getting pretty warm as well. I am measuring roughly 140+ degrees Fahrenheit on both. Is this normal? The other ones are cool to the touch.
Sounds like I have a ground problem or a bad connection somewhere. Kind of at a loss now, cause don’t I really don’t know where to start troubleshooting from here…I am guessing that is dealing with a preamp-voltage from somewhere that causes this to happen. Am I wrong? Ideas? Anybody have this issue before?
I replaced both PPs and the .22kOhms for both. They were different. One side had the original style (with two) and the other the one with 3 pins (the 2 in one model).
I have had this receiver for about 20+ years now. Sorry to the owner of the pic I stole.
Thanks in advanced-
This is my first post, and did some extensive reading and followed a few posts instructions. There are some very knowledgeable people here at AK.
I’ll start from the top:
Had no sound and no relay engagement, did some troubleshooting.
Removed the PPs, after, I could not get good steady readings on them. Tested one at a time-Voltage vs. shorts etc…Found that one of the packs were bad. To double check, I reinstalled the “good” one. Got relay pop and output. SO, ordered new ones. Very hard to find from a good source, I might add-still don’t know if mine are up to par yet. Have not tried to push them above 10w yet…Then I noticed that my 2 channel meters were not producing the same output and was slightly noticeable in the speakers. Read up a little more-did the DC adjustments/readings checked at 10, 30 and 60 intervals, then checked again in 2 hours. Good there, but still have the slight power level drop. I hooked up an external input to listen to some music (via RCA cables). When, I switched over to Tape Monitor, heard a loud POP through the speakers. Ok, no big deal (came across a “how to” post on cleaning procedures on switches and stuff), read up, followed instructions and cleaned all. Then went to try it all again. Have the same issue. Cleaned a second time, had the same results.
Steps I have taken: Re-soldered switch joints, switched inputs (RCA source), switched RCA cables (cleaned in and outside of the RCA inputs on the unit), switched speaker ports (A & B), AND still have same issue. This is no doubt what caused one of the packs to blow. When this happens (if volume is turned down or slightly up-no difference), it causes the meter reading needle to almost “tap-out” on the other side (when this happens relay disengaged then back on). If I slowly guide the switch to the other position, all works well. Just when you flip the switch down/up (like you would do for normal operation-I’m not slamming them down/up), it does this. I have noticed when it flips down/up a little harder the pop sound is noticeably louder. This issue occurs on all flip switches (except the Loudness one)-Mode (Stereo/mono), Tape 1 & 2, Low Filter, and FM Muting switches.
Also would like to note that the 3 in a row transistors w/heat sinks (Q25, Q19 & Q20), they were all touched up with new solder. Although, Q20 (the one closest to the front of the unit) is the one getting pretty warm vs. the rear one (and looks like it has been for a while-not from my repair I’ve been working on). Also, the resistor (R323, 2.4kOhm @1W) in front of Q20 is getting pretty warm as well. I am measuring roughly 140+ degrees Fahrenheit on both. Is this normal? The other ones are cool to the touch.
Sounds like I have a ground problem or a bad connection somewhere. Kind of at a loss now, cause don’t I really don’t know where to start troubleshooting from here…I am guessing that is dealing with a preamp-voltage from somewhere that causes this to happen. Am I wrong? Ideas? Anybody have this issue before?
I replaced both PPs and the .22kOhms for both. They were different. One side had the original style (with two) and the other the one with 3 pins (the 2 in one model).
I have had this receiver for about 20+ years now. Sorry to the owner of the pic I stole.
Thanks in advanced-