Posts by jhoyt (archived)
35 total posts31 results
Delayed Relay Circuit (startup board, BM8000)
in General Discussion & Questions · Jan 23, 2010 13:57Quick question, does the 8000 share output boards with the 6000?
Delayed Relay Circuit (startup board, BM8000)
in General Discussion & Questions · Jan 22, 2010 20:35I think the best thing to do is to replace the board. Do you have access to one, or know where to find one? My board is pretty darkened under the row of resistors. And, when I was replacing those resistors, several trace…
Delayed Relay Circuit (startup board, BM8000)
in General Discussion & Questions · Jan 22, 2010 10:39The "blast" would have been pretty neat--except it was on my receiver! I did not replace any of the semiconductors except the predrivers. They looked pretty badly scorched. I'm thinking now a diode might have failed into…
Delayed Relay Circuit (startup board, BM8000)
in General Discussion & Questions · Jan 21, 2010 21:41Well, I got the parts today, and attacked the Startup Board first, putting the new resistors in. Now, I had previously removed the output transistors on the amp board that had blown up, and had disconnected power to that…
Delayed Relay Circuit (startup board, BM8000)
in General Discussion & Questions · Jan 18, 2010 19:34Can I do a resistance test on the transformer secondary? Do I remove the leads going to the rectifier? What about the big lead going to the main filter caps? Thanks! 😐
Delayed Relay Circuit (startup board, BM8000)
in General Discussion & Questions · Jan 18, 2010 09:12I have ordered more output transistors and power resistors. Next step will be installing those sometime later this week, or this coming weekend. Then I hold my breath and switch it on again...
Delayed Relay Circuit (startup board, BM8000)
in General Discussion & Questions · Jan 17, 2010 18:25Well, I figured out a couple important things: 1. The circuit does not match the schematic. The circuit diagram shows the two 5.6 ohm resistors in series , for 11.2 ohms total. The circuit board itself has the resistors …
Delayed Relay Circuit (startup board, BM8000)
in General Discussion & Questions · Jan 17, 2010 11:11Excellent explanation! That's exactly the information I was looking for. Thank you Martin, you're a great help!
New member, new (to me) Beomaster/gram 8000
in General Discussion & Questions · Jan 16, 2010 23:13I started a new thread about the Delayed Relay circuit.
Delayed Relay Circuit (startup board, BM8000)
in General Discussion & Questions · Jan 16, 2010 23:12I'm trying to troubleshoot the Delayed Relay circuit in my Beomaster 8000. Looking at the schematic, it appears that the trigger comes from the secondary windings of the large transformer. But how is the relay R1 to be e…
New member, new (to me) Beomaster/gram 8000
in General Discussion & Questions · Jan 16, 2010 18:25Probing around, here's what I'm getting: Power resistors: ~115VAC across each Large transformer: 0V in, 0V out Small transformer: 115VAC in, 18.5VAC & 5VAC out
New member, new (to me) Beomaster/gram 8000
in General Discussion & Questions · Jan 16, 2010 15:57The startup resistors have been replaced with 5.6 ohm 5W wirewounds, but the output transistors have not been replaced yet. Now, are you talking about the smaller transformer secondary windings? I didn't check them for p…
Help with Beomaster 8000 (digital noise)
in The Workbench · Jan 16, 2010 13:58For a "warmer" sounding opamp, try an OPA2604. I have used both the 2604 and 2134 in a couple modded tuners, and there is definitely a sonic difference. Interestingly, an older tuner (Kenwood KT-7500, heavily modded w/21…
New member, new (to me) Beomaster/gram 8000
in General Discussion & Questions · Jan 16, 2010 13:50Here's what's happening: At startup, RL2 instantly closes. However, RL1 never does. So I have full preamp/control functionality, but there is NO 55V voltage in the system. RL1 never energizes, there is 0V across its term…
Help with Beomaster 8000 (digital noise)
in The Workbench · Jan 15, 2010 21:46Can you tell me what op amps are in the signal path? I'm currently rebuilding a BM8000.
BM8000 beomaster acting up
in The Workbench · Jan 15, 2010 20:52I know this thread is so 2009 , but I wanted to report in that this fixed (so far) a big problem with my BM8000. The wires went in pretty cleanly, and it looks no worse than some other "factory" circuit modifications I'v…
New member, new (to me) Beomaster/gram 8000
in General Discussion & Questions · Jan 15, 2010 17:24Update: this morning I replaced the bad power resistors on the startup board. But the problem is continuing. I've traced it back to the "delayed relay" section of the power supply board (6). Could the receiver be refusin…
New member, new (to me) Beomaster/gram 8000
in General Discussion & Questions · Jan 14, 2010 21:53I discovered something: the two diodes on the startup board test OK (out of circuit, of course). However, the two big power resistors, 5.6 ohm, measure at ~200K! That would certainly explain the lack of power to the tran…
New member, new (to me) Beomaster/gram 8000
in General Discussion & Questions · Jan 14, 2010 15:53Thanks, Martin. I already have the SM, but didn't see the error code matrix before. I just found it. I will definitely check 9IC3, especially in the vicinity of pin 31. The unit works for a while, so I imagine the issue …
New member, new (to me) Beomaster/gram 8000
in General Discussion & Questions · Jan 14, 2010 09:05There are two distinct relay "clicks". I'm not sure how many there are onboard, though. I believe the fuses are good, also. One I visibly checked, the other ohmed at a dead short. I'm thinking something happened on that …