Vintage Ibanez Musician MC-900 Bass Active Electronics Repair
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- เผยแพร่เมื่อ 6 ต.ค. 2024
- In this video we will replace the integrated circuit (IC) on the active electronics module of a vintage Ibanez MC-900 Musician Bass guitar. After testing the components on the module, I had concluded the fault must be with the IC, but after replacing it with an identical part from Texas Instruments (TI MC1458P), I discovered another problem...
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Thank you! I had the exact same problem and without much knowledge of electronics, was able to order a zener diode and replace the defective one. I now have an active MC-900 bass! Excellent video. Thanks again!
Hi - @sbrien or @guitologist ! I just picked up one of these and the person who had it monkey'ed around with it and I'm sure everything is not wired correctly - there's at least one wire dangling loose and the output jack is replaced. If you still own yours, would you be willing to take a couple detailed pictures of the wiring?
Those op amp chips are pretty robust. I use them for my reverb pedals, and my spring reverb drive and recovery circuits. I've never had a bad one yet. I believe the TL072 can be used in place of the one you replaced as well.
that is a lovely bass.I got my son a cort artisan 5 string second hand and cleaned it up.very similar bass.so hard to give it to him once id bonded with it! He loves it
Cool basses. Sting used a fretless one for a time with the Police, as did Adam Clayton in the early days of U2.
Dont forget Patrick Waite (RIP) of Musical Youth and Alex Blake of Lenny White Lifetime!!!
Also Stanley Clarke.
The spec sheets say that the 1458 is the equivalent to a dual 741. If you have messed around with small op amp audio amplifiers you see the 741 used a lot as a pre-amp so it makes sense as it can boost, set up filters, and you can connect tone controls plus more with them. A 741 pre amping a 386 is a very common setup. Cool to see a board like that in a bass guitar.
Hi Carl. Yeah, I thought this was a snazzy board too. Would be an easy little pre to clone. The only problem would be getting the board with those terminals on it. Could be subbed with ribbon cable, I guess, if both male and female ends were replaced.
That one was made in October of 1979.
I used to have a Music Man 120HD. It was supposed to be Leo Fenders updated version of his Tweed Fender Bassman amps. It was about the same size but, had Reverb, Tremelo and a Master Volume on one channel. Also a Mid tone control. It had four 6L6 output tubes and was switchable to use two or all four. This allowed for either 60Watts or 120Watts. Being a tech myself I took it apart only once. Just out of curiosity. The pre-amp and everything thing else was made up of those same 8 pin op-amps that you replaced in this video.
Good deal... at least it's fixed now. I'm still working on "King Louie"... a 100W all tube bass amp... Reveal once it gets up and running.
I'm pretty sure the MC900 only went to 1978 when it was replaced by the MC924 (24 fret version). The month/ year of production can be determined by the serial number. That was probably a D7 as the 1st 2 characters. The 1st letter is the corresponding month. ABCD = Jan Feb Mar Apr of 197x.
That's a rare finish! I always wanted one like that but am very satisfied with my Dark Stain finish !
Personally I've never seen a MC900 from '78 or earlier, but they sure were made in '79 and possibly beyond: I own a MC900 and it's from december 1979 (L79).
EarlDeWijs I actually have a friend’s MC900 made in 78. We bought ours around the same time from 2 different areas of Chicagoland and they both have replacement Bartolini pickups in them. Not 4 months later, we ran into a guy in Guitar Center with the same setup! lol
Nice bass! These tuners are really great with the outer tension adjust collar, however my MC-300 has no room for the tension lock. I suppose the tension shouldn't be likely to vibrate loose on a guitar, though they seem to need the occasional light tweak. The edge connector setup there was very common in the audio equipment I working on in recording studios back then, so my guess is, the system was simply repurposed. You should have little problem finding those boards, or making some up, as that is the same connector as used in the API 500 style System.
Good video!!! Very nice looking bass!!!🎸🎸🎸👍🏼👍🏼👍🏼😊
I agree. extremely well-made, pro-grade bass. My first experience with this model.
Hi Brad, Good repair, nice Bass. IC sockets are always nice for later swapping of DIP's, etc.. Solid State is pretty bullet proof, usually. Be good, C
Hi Cass. I actually have some sockets onhand and did think briefly about putting one in so the chip could be swapped easier in the future, but I was afraid it might be too tall for the standoffs.
The Guitologist Hi Brad, I would never suggest you don't know what your doing, you are quite good at diagnosis & repair, and, you can play really good. I figured the thought occurred to you and that you had your reason's, just a thought as always. IC right on the board works too. Always looking for your new uploads, I really enjoy your videos. Well, enjoy the last couple days of Summer. Take care, C.
The socket idea is a great suggestion! Keep em coming!
Very common chip made originally by National Semiconductor. LM 1458. When other companies make a part, often they change part numbers. Sometimes quite drastically. Dual op amp. They need plus and minus to work, that's what the zeners did.
When handling chips, I like to use a ground strap to avoid static electricity from damaging input transistors, particularly Mosfet gate inputs.
I got the same model and the active EQ sounds very noisy - i can hear it a bit with yours? Is it a shielding issue?
Sweet bass Brad I thought you would of been in there at the end with your Les Claypool esk chops and all aye haha! I've always wanted a higher end Yamaha Broad bass they have that similar construction and finish without the active electronics.
Bwahahaha. How awesome would that have been? Just slap out some funk on it at the end. Nice tip on the Yamahas. There are definitely a lot of really great bass options from 80s Japan. They were making fabulous stuff.
Have you tried these CL pedals i've heard about ? .....
I have an older budget Ibanez bass that has an active bass boost. It's a full-scale instrument with both P and Jazz pickups, each with its own volume control, and it has plenty of low-end, so I never use the active bass boost. Unfortunately, you can only turn the active bass boost all the way down, you can't bypass it completely, so I have to keep batteries in it even though I'm using it like a passive bass. I want to just rip it out, since I got it used for like 300 bucks and I doubt I'll ever sell it. Eventually I will get around to it.....
Having a buffered output is not a bad thing on a bass ;-)
It doesn't have any negative effect on the tone that I know of, but the active electronics are ALWAYS sucking juice out of the battery, whether I'm playing the bass or not, whether there's a cable plugged in or not. The only way to not have it always "on" is to disconnect the battery when I am done playing it, and that requires leaving the battery compartment open and I can't remember to do it every time, so I will sometimes come back to record another track and go to reconnect the battery (because it won't pass ANY signal without the active circuit getting juice) and discover that I forgot to DISconnect it and now the battery is dead or close enough to dead to sound like shit. It's another thing to have to worry about changing batteries on and buying batteries for, when I never actually use the bass boost. I also go bass-compression-amp or bass-compression-line in when I'm recording direct, so a buffer stage up front isn't necessary, and I am not even sure this works as one. I haven't seen a schematic for it or even looked at the guts.
To my knowledge all acive circuits are low impedence on the output side - buffered.
What was the value of the zener diode?
Mate its a 1N4742, 12 volt zener diode. Readily available from most electronics shops.
Ibanez make some of the best guitars and basses, love em. I love all guitars tbh. Unless they are Gibsons :P Just kidding
What - no setup?
I would be mad if that was my bass, you changed the chip and it wasn't even that. I have been into electronics for 25 years and I would never do that to a client, change parts when they don't need to be. I mean everyone makes mistakes I know, but you do this all the time so mistakes should be slim to none. I am not hating just stating a point, so no worries its all good :)
Why on earth would you be 'mad'? It's the exact same chip. Made by the same company, even. It's an IC, not like I went from a germanium transistor to a silicone or something. I usually won't touch this stuff, but his bandmate is a tube amp customer, and the only other people he could find within a couple hours' drive to work on this were in Indianapolis.
This channel is "The Guitologist" Not "Er Guitars" I'm not aware of a Luthier's/electronics expert book of business process and/or ethics that list guidelines on how to approach repairs, upgrades or mods....
Well, the customer was told everything that was done, and this video was provided so he could see precisely what was done, if he was interested (a service not many other techs would dream of providing for their customers.) He was happy.
If this was someone's vintage effects pedal that had some special esoteric chip not produced anymore, or if it had all these germanium transistors that are hard to get, I might have double and triple checked every other component before ordering a new IC, even though that would run up the labor cost. In fact, I probably wouldn't even take on that job in the first place. In this case, the part is common, so common in fact, they are only $.50 per chip, and there is no difference between the old part and the new part, and in my experience with ICs, they can and do fail, and they are hard to test in circuit. Ordering the part and just popping it in was, I still think, the right approach in this case. I had tested everything else that could be tested in circuit and somehow I didn't catch the bad diode. I swear I checked it, or at least thought I did. It was an honest mistake I'm not that ashamed of making. It always seems to be the other techs who get mad about this kind of stuff. The customers usually just want their shit to work again.
Agree with your reply... I'm an Ibanez player and collector, active participant in the Ibanez Collectors Forum, nobody would argue that the integrity or vintage aspect of this instrument was modified because you switched out a 50 cent, and DUPLICATE chip. At some point to make an instrument play (as it was designed and intended) your hand is sometimes forced to use newer parts since original stuff is no longer available. In the case of this musician bass, you replaced a part that is still available and it changes ZERO in the tone or playing of this bass. Mistake or not that little chip was insignificant. One of my 30 guitars is a 1976 Gibson S-1, extremely complicated wiring/switching electronics. In order to restore mine, the tech had to use newer parts including wiring. it did nothing to reduce the value.....
I think this was a case of someone not really paying attention to the video or not understanding what was going on,,,,,,