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not sure that helps. That's an XA not XB and doesn't appear o have the same plastic cup.

I believe I did try oil first but can lan an try again. Do you have a c lose up pic of where that cup is sitting exactly? The issue with mine is you can't push it Below the level of the plinth and when AT the level of the plinth it definitely is not in a position to turn

The tonearm on this table is not swinging as freely side to side as I think it should. As a result, when it hits a scratch the record repeats in that section. There is a little plastic white "cup" or "sleeve" that the base of the tonearm goes through. When this sleeve is flush with the base, it...

Update - I purchased another PCB 4 relay board on the bay stated to be in fully working condition and swapped the original out. No change. Same issue on all channels. Since the odds of 8 relays all being bad are slim to none, the issue must be elsewhere...

Have a problem with Sync mode. Regardless of input channel used, I get random problem with the input signal level not making good connection. (guitar on Mic input, with Mic Att switch set, system, set to record with Pause on, SYNC mode engaged, function switch for that channel engaged) If I...

I know it hit the base.collector pair, spark, then fuse blew. If I had easy access to the bottom like most receivers that have a removable bottom plate, I probably would bite the bullet and send off for a $10 replacement and in a couple weeks hopefully be back in business to start debugging...

I didn't catch the bolded lines until a poster informed me. I had already taken voltage readings at every single point where the schematic listed the values. They were either the same or close (where close, they were the same across both channels, so regardless of the reading found, I deemed...

Left channel is working fine. Yes I did compare channels with sine wave Dual channel scope) and voltages. The schematic I posted showed the differences. Perhaps not ALL the differences in the whole circuit, as I just spot checked a few points at that time, but clearly the problem areas with the...

Sorry - I am still learning. "output offset"? Where is that measured?

Ah - Which ones do you recommend doing first (e.g. most likely culprits)

The older original one had become completely unglued at the frame, both at the surround and the spider. I glued that last night with carefully centered of coil etc and hope to retest that today. Would it be a fair assumption that perhaps the same happened to the other cab and whoever did the...

Hi Craig - I believe I have done that (at least those marked on the schematic) and I noted differences in red.

I have a pair of cabs. Serial numbers are close, but not matched. (36372 and 36376) but woofers are completely different. One is clearly and old AR woofer, and stamped as such on the frame, cloth surround etc. The other "may" be an AR woofer, but I can't find any "ar" markings to confirm...

Thanks I didn't catch those darker lines. -29v on the emitters of Qm6/Qm8. 0.7v on the emitters of Q2/Q4. Same values on the other channel so those are good. The tracing starting at Q2 confirmed what I had already posted in the schematic above with the red dots and voltages. Signal gets...

ASO? What is that? Yes I had confirmed preamp output sounds fin (both a rec out and the two line into power amp board)

Heavy audible distortion in power section when playing music, right channel and fairly lower output then left output volume. Confirmed with a pure sign wave and oscilloscope as well at a couple red dot locations shown below. Bad voltage readings shown in red. 1) Trying to understand the audio...

Unfortunately those platters aren't cheap to buy and "try". I've set a watch for one though. I'm pretty certain the tape head is fine though. Asked a few sellers that had them to measure the resistance and they get the same value. So that leaves either the circuitry or the platter strip

On power on, the speaker/protection relay normally turns on/connects just fine and all is well (no load) However, and I haven;t figured out the exact timing. I can turn this on/off multiple times in rapid succession without issue but some timing (that I haven't clued into just yet) every once in...

Mag strip looks to be fully intact, no cuts/breaks damage etc. Did a light clean as well. Head was already pretty close. I moved as far forward as would allow without touching but no change. (also tried moving back). In circuit, I see about 470 ohms across the terminals of the head.

Motor playing at 3-4 times normal speed (regardless of 33/45) Known issue with this model? Anything to check/measure?

Just an update on my progress. It was definitely some kind of parts failure on the mpx board. Since I never got anyone to assist me with a circuit level debug (which is what the original post was all about) I was lucky enough to have another 990 lying about with more major problems then this...

Well I did a cleaning on those boards with no impact to the issue. However, I did find a green cap on the mute board with one of it's legs up. Odd because there was no indication of solder on it, the hole was clean with no solder around it either (other them the general trace). Once I solder...

The speaker connections are two screws

Pair of speakers. I don't think homemade, given the bevel on front. Most people wouldn't do that I think It would just be flat . Cabinets measure 21x16x11 1/4 Better pic. Covers don't come off. Back has to be unscrewed and I don't have/own them

I'm familiar with all the advent series - definitely not that brand. Unfortunately, i don't have access to the speaker itself.