Fixing Alpine-3554

[ben_lesmana]

Hello,

I would think 1 regulator is evaporated, and also 2 mid sized caps. So chain of events are: Capacitor failing, exploded, regulator failed, heating and explode the area?

I keep wondering how it can get so much energy to evaporate that much area. The left over are black hardened gel (?) Hard to describe, on the heat sink.

Would anyone have a high-res picture of that area? Front side and backside? Im still considering whether I have enough experience to fix something like this.

Thanks everyone,
Ben

 

[Perry Babin]

I don't think your capacitors exploded unless you spent a lot of time cleaning up the area. When electrolytic capacitors explode, it looks like the mess in the attached photo.

That gel is likely melted epoxy resin.

 

[jol50]

The 3555 hole is from the rails. The rails go right through there on traces to the regulators. The bars take power over the top for the amp, but the traces burn to each other and roast the board there. The transistors start it for whatever reason, the caps were fine in mine. Most small caps blow and nothing much is left.

 

[hottub]

Alpine 3554 Schematic

Hi

Has anybody managed to come across a circuit diagram for this yet? 🙂

regards

mark

 

[Perry Babin]

Email me.

babin_perry@yahoo.com

 

[bjdd]

please has someone got circuit diagram for dap600 i changed outputs used 2n3773 and 2n2955 external current is good and heavy

 

[404Amps]

ALPINE 3554 REPAIR

Hello All,
I'm replacing ps transistors in an old school alpine 3554, and having problems locating enough of the original SANKEN d1065 units. I actually have 4 of these amps.

Can anyone suggest a source for the D1065 transistors, or maybe a close match substitution. I was looking at the Fairchild KSC5047TU as replacements. Will these work? Do I need to change the resistor values?

Any and all comments are welcome. I'm trying to put together an oldschool/new school SQL system using the ALPINES, and maybe a PUNCH 1000. Also considering a D-Class amp on subs.

 

[seankane]

15pcs 2SD1065 Original Pulled Sanyo NPN Silicon Epitaxial Transistor D1065 | eBay

There quite a few of the D1065 on ebay.

 

[404Amps]

Thnx SK, I looked at those. I was concerned that all would not be date code matched. I called the company for the listing and they confirmed my suspicions. They also tried to change the price per unit when I askes if I could order 20 pc. At that point I just dropped the call.

 

[404Amps]

I called Digi-key, and their tech support recommended TIP3055g's, IIRC. Any thoughts on this as a substitute?

 

[Perry Babin]

The 3055 is likely too slow. The following part (Mouser) may work:
512-FJA13009TU

You should be aware that there is a significant problem with counterfeit parts on eBay. When you find a supplier with a large stock of NOS parts or new parts for a transistor that was discontinued 10+ years ago, you should be suspicious.

 

[jol50]

Littlediode says they have them. I bought hard to find stuff there like STK ICs and worked fine, but I know little about them otherwise. They used to sell on ebay too. Anyone know anything about them?

 

[404Amps]

@ PB, do you think by substituting the bjt's will this affect the sound quality of the amp?

 

[Perry Babin]

I'm not sure if you're asking me. If you are... If the substitutes are a suitable replacement, there will be no difference in sound. You won't know until you try them.

 

[ninoslav]

I have problem with left(white connector) chanels, I have not output. Problem is in preamplifier section. Can somebody send me a circuit diagram of this amp? My email is raskovicninoslav@gmail.com. Thank you in advance!