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Thanks for the help! My 48 is up and running very well now... Now one more question... If I fast forward or fast spool and press stop, the brakes don't engage till the reels have slow down on their own and it takes much time for the unit to stop. This is most frustrating when I'm using the...

Man, I thought your suggestion might've been off as I'd already tried a few different tapes. One, which is the aforementioned 499 and pretty new, but just for a sanity check, I opened a brand spankin' new reel of 499 and popped it on there... Low and behold. Noise and artifacts/dropouts are...

Hey Guys, I have a Tascam 48 that I just modified. The Record Amp cards have all new electrolytics for the power supply rails and Nichicon Muse ES between signal stages. LME49720 and LME49860s have replaced all the op amps except for the VU meter amps. .1uF decoupling caps have been added from...

What I think has happened is that I have a later model 48 and all of my manual/specs/schematics don't reflect the actual hardware I have. Here is the full blueprint of the Control PCB. The real hardware has several more ICs on it as you can see.

Upon further investigation, I've found that my model of Control PCB is totally different than that of the blueprint in the manual... in fact the resistor parts in the manual only go up to R183, while its completely visible by this image that I have an R186... I'm thinking there is no longer an...

Here's the condition of the unit... dim Spooling LED when in "Spooling" mode and dim Record LED when in "Recording" mode. The Stop and Edit Button LEDs don't even turn on ever. Its hard to tell from the photos but both of these LEDs are about half as bright as the others of the same color on...

Ok, after a couple years of not messing with this issue, I've decided to get my butt back in action to finally figure this issue out! I've measured R41-R43 and all check out fine. R44 on the other hand cannot be found!!! I've attached the schematics and a couple of photos of the Control PCB. I...

Thanks for the idea... I wish I could try on somebody elses machine, but I don't know anybody else who records to tape!:) Maybe a good thing. BUT, I've not run the recorded signal through a scope. I have a computer program scope and my buddy has a real scope. What frequencies should I be looking...

Yes I believe it does. So you might be right about that. Maybe just recapping the bias card?

Hmmm I wonder if it has anything to do with the electrolytic caps on the bias cards, channel cards or even power supply... You'd have to think that after 25 or 30 years these machines aren't going to be up to spec...I got my machine on Ebay and don't really know its history of refurbishments, if...

Yeah, I'm using SM911 too. I didn't notice it as much when I was running Quantegy 499... but I probably didn't have my machine biased the same. I'm using a Tascam 48. I also have been reading about using the 40-50hz tone and biasing for minimum noise. It works really well. I just listen to the...

Hey FSTRAT, did you ever figure out what was happening with those artifacts? I have a tascam 48 and have the exact same situation. Any ideas would be great!!

Will do, thanks for any help you can give. If I can't get it figured out, no biggie... deck still functions perfectly, just very annoying to me that something is not right!

Thanks man, that is very generous of you! Have a good weekend.

So, I bought what I thought was the LED Driver IC from Mouser for U18 on the Control PCB and no luck. Now, I'm thinking it might be U3 which doesn't seem to have a replacement part out there... The part # is MB8243. I didn't seem to see it anywhere in a Google search.

Thank you both for your suggestions! We have fixed it! So, with no success getting the channels to cooperate by lots of button pushing and sweeping with cleaner, I pulled out the cards like Sweetbeats said and reflowed the solder joints on the Channel On buttons and the balance pots.... Put...

I also failed to mention that just touching the on button with the softest of touch will make it cut out or cut back in. A couple of Panning pots on the affected channels also don't pan properly. Could it be something with the proximity of those pots and the on button? Makes no sense to me.

Thank you both for your suggestions. I've tried both options with no success. I think the problem is the on button. Can I deoxit that?

Hey Guys, I'm trying to figure out an issue I'm having with my M-312B board. When I pass a signal through any of channels 3-6, they cut out by tapping on any of the lower buttons(closer to operator) such as the bus select or fader buttons. If I start by passing a signal through and they are...

Update: Thanks for the replys guys... I now think it isn't blown LEDs. I figure this because after plugging in my RC-71 remote and pressing REC to engage record (which it does) the red LED on it doesn't turn on (on the remote). Now, this remote was not plugged in during any of the shorts, and...