VZ Issues: The Saga Continues

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Gluecifer

Member (SA)
Hahah, I'm a patient man! But when I think I'm close to solving a problem, my patience disappears!!
My biggest problem is I get 2 days a week to work on stuff and then everything has to be packed away and started on a fresh the next weekend.
So when I've got a radio apart in a lot of bits I like to make as much progress as possible.

I've got no clue about reading a multimeter, but a friend will be over later today who can show me. I've looked all over the VZ and there isn't the same one anywhere I can see, but today is the first day of my life I've ever paid attention to resistors in way shape or form.

I can get resistors locally, but I greatly apprecite your offer Norm.

The million dollar question is now which ones I should get to test out?

Going off the colours of the other resistors on the board I'm pretty certain it's a red stripe. The brown on the other ones is a much more fauny brown.

One thing I'd like to know, and this is obviously pretty basic stuff, but does a brown resistor with the same colour code do the same thing as a white resistor? Or are do they do all different things based on the main resistor colour?

Like I said, this is all new learning for me, and without your guidance and help I'd still be rooting around through the little hole in the motor with a screw! Really appreciate all this help Norm!



Rock On.
 

Gluecifer

Member (SA)
Ahh Norm! Underneath the PCB!

Checking the underside of the motor PCB there IS another one the same!

dscf3451.jpg



This will make life easier.

One of the round caramel coloured things has a couple of scratches as seen below:

dscf3453.jpg






Rock On.
 

Gluecifer

Member (SA)
I'm going with your theory on the brown band too. The resistors in the motor are a completely different colour cast to the ones on everything else on VZ.



Rock On.
 

Superduper

Moderator
Staff member
:w00t: See, I just KNEW we would find it. All you need to do now is measure that value and you'll know what to stuff in there. Keep in mind that the blue-gray combo will always start with 68--. So the rest is the multiplier. So if you read 703 ohms, don't kill yourself trying to find a 703 ohm resistor. There is some error always introduced through the leads, measuring equipment accuracy, tolerance of the resistor, etc. Whatever the reading you get, the closes 68-- value combo will be the one. So looks like we no longer have to guess. Measure that resistor and put the proper one in there. As for that caramel looking thing -- that looks like a ceramic capacitor.

Well, I said it looks brown because red really looks red but then I'm looking through the filter which is my computer screen. You see the resistor that has 3-red stripe? Now THAT is red. Anyhow, the color code is the only thing that is important to you since I'm virtually certain that the resistor in there is a standard one without special purpose. There are others that are flameproof, fusible, and different compositions such as carbon, wire-wound, metal film, etc. For the purposes of which you need, a standard 1/4watt 5% resistor is all you need. The 5% is indicated by the gold stripe. Since it costs more than 10% (or worse tolerance) resistors, 5% resistors wouldn't normally be used unless they wanted the tolerance to be that precise.

==========

Anyhow, if you replace the resistor and it continues to work exactly like it was BEFORE you broke that resistor, then perhaps it's working properly (the motor anyhow) and you need to focus attention at the actual speed control circuitry, which is on-board. to fix the speed issue.
 

Gluecifer

Member (SA)
I always learn so much from you Norm! It's awesome. And forgive me if my response aren't super intelligent. But I always think that maybe someone else will come along with my level of electronics knowledge and maybe learn something too.

I'll get the value and then order some this week and see how I go.

Should I be concerned about the scratched ceramic capacitor?

As far as how the record player was working before I broke the resistor in the motor it was playing perfectly but just a little slowly. The issue since the resistor broke seem to my untrained eye/ear like it was the speed-governor or something for the consistency of the speed, more so than the actual speed which the pots on the main board control. If that makes sense.

Thanks again Norm, as long as I'm moving onward and upward and not backwards I'm happy!



Rock On.
 

Superduper

Moderator
Staff member
Highly doubtful that the capacitor got damaged from a few external scratches but if you are concerned, you can go ahead and change it. I don't think it's critical -- my suspicions is that that capacitor shunts noise to ground.
 

Lasonic TRC-920

Moderator
Gluecifer said:
I always think that maybe someone else will come along with my level of electronics knowledge and maybe learn something too.

Absolutely,

Great work guys, interesting read....

GOOD LUCK RICK!
:popcorn:
 
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