Classic I / Classic II, No Internal Sound Mystery

[uniserver]

ok so i have herd reports of people with sound from the head phone jack.

but no sound from the internal speaker. With the Classic 1 and 2.

As we know, With the Classic I/II, the speaker is attached to the A/B.

The plot thickens… Some of the time, People have re-capped the A/B, even though the A/B needed caps… it did not fix the issue.

Still no sound from the internal speaker.

I have yet to experience this personally.

But i know of others that have this issue right now.

So anyway, ended up getting a Classic II last weekend.

Recapped the main board… Recapped the A/B oh yea and it really needed it too!

Finally this dreaded issue had happen to me.

Lookin around, following traces…. What gives all the new caps check out good…

So just for giggles got out the multimeter set the dial to ohms.

ok checked the speaker… Zip nothing, dead open.

So i checked a known working speaker from a parts LCII… It says right on the LC speaker

REGAL

16Ω 0.25 W

TAWAN

and sure enough the meter says 14.6Ω

Close enough for me…

The bad speaker says on it:

AAP

600-0456

Quadtronics

0.2W 63Ω

PROC

Not sure why such the Ohm difference.

Anyways so the bad speaker is riveted to the A/B with some aluminum rivets.

I was able to use my side cutters and squish the rivet, and the speaker came right out.

attached the new one with about 5 dabs little dabs of goop.

So if your classic 1 / 2 has no sound from the internal speaker, check it with your meter.

It may be bad.

 

[techknight]

Careful. The higher impedance means the output circuit is designed with that in mind.

With a lower impedance speaker, the sound will be much louder with higher distortion, However it will cause the output stage to be driven harder, resulting in failure. there has to be a reason why they chose that impedance.

I deal with this every single day in the car audio world, people hooking up 1 ohm loads to 4 ohm stable amplifiers and blowing them up.

 

[Macdrone]

Thank you for your post on the speaker. I am going to check mine now.

 

[uniserver]

maybe there is a dot between 63, witch would make it 6.3? i don't know.

I will say this LC speaker the sound at #7 is LOUD but not distorted, its crisp.

Maybe because of those enhanced sound holes apple drilled into the side I don't know.

Maybe they installed the wrong speaker at the APPLE Philippines Devision and that is why it blew in the first place.

as we all know mistakes do come from the factory.

 

[Ike]

Its really a 68 Ohm speaker, I tested a good one from my Classic I

 

[onlyonemac]

So if one could source a replacement speaker, then it's working again? Perhaps it would be helpful to ask others with the same issue if this could be the cause...

EDIT: To be honest with you, I didn't know you could get such high resistance speakers.

 

[uniserver]

I have many parts machines… the LC speaker works fine. It's the same size and everything.

Sounds fantastic… -- @"7" it might be producing a little louder Volume then the stock one in there…

but the audio is rich and distortion free.

I am thinking that speaker in there is WRONG… that is why it blows in the first place.

 

[techknight]

Unlikely. That would only be true if the original was of a lower impedance than the current replacement.

 

[uniserver]

regardless LOL…

This is not a car audio system, or an audiophiles home entertainment system.

as long as it still makes BEEPS AND BONGS. I'm sure one would be satisfied.

Any typical round (magnetically shielded) computer speaker you glue there is going to work.

will work better then whats already there…. witch is dead.. ( if its dead )

Let's just say the OEM one died because of quality issues… Yeah that sounds good! sure.

 

[techknight]

LOL. Well it looks good from my house.

As long as it works. I just have to take a look at it from an analytical/electronics dork standpoint.

 

[uniserver]

lol dork

 

[techknight]

yea I know it

 

[uniserver]

did you end up sending those 2 se/30 boards back to ur buddy in japan?

 

[techknight]

No. not yet. I need to though.

 

[uniserver]

man your terrible

 

[techknight]

Yea well it sucks working 2 jobs.

 

[uniserver]

well sounds like your keeping the family fed!

 

[techknight]

well sounds like your keeping the family fed!

Its just me. Dont have a family. Both are relatively low-paying jobs (there are no jobs in my area). But just enough to keep the bills paid.

The type of work I am in isnt paycheck-to-paycheck. (Both jobs are contract based jobs). Its work work work, get a lump sum, then work work work again. lol.

Luckily though, job2 is pretty much dead until about middle of january as everyones gone on vacation for the holidays and repairs/requests arnt coming in either. So technically I am only working 1 job right now which is why I have excess time to blow posting on the forum. lol.

 

[unity]

For the record, I have two new Classic II replacement analog boards. They both have 63 ohm 2.5 watt speakers. Can not tell if it should read 6.3, but they appear to be 63.