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How to test Grado SR60s to determine if driver, cable, or plug is the problem? - Page 2

post #16 of 21
Thread Starter 

mol,

 

When I set up my cheap Harbor Freight meter so it read 31.5 on the good driver, the bad driver just showed 1.  No zeroes or decimal points.  Just 1.

 

poormxdad

post #17 of 21

poormxdad,

 

I don't have the same meter, but if it is anything like mine and set to 200 ohm range, a reading of one ohm should read 1.0 with precision to one tenth (especially since the good driver shows 31.5).

When the probes are not touching anything does it also just display a 1? Mine does.

If so it seems to me that the driver has a break (not a short) somewhere in the voicecoil or the wire from the coil to the pads. I don' t have experience or knowledge about repairing headphone drivers, but I would imagine that it would be pretty difficult since the wires are so thin and are usually coated with enamel making them very difficult to work with.

post #18 of 21
Quote:
Originally Posted by poormxdad View Post

No zeroes or decimal points.  Just 1.

Oh snap!

There is a difference between "1" / "1.0" and "1." on a multimeters display.

1.0 = 1ohm (common probe/cable resistance on cheap meters)
1. = no conductivity

Cutting cables is not necessary in this case, except for desoldering the (broken) driver...

I regard to unwinding the drivers of headphones, I've done that and succeeded at it. I had the exact same defect on a 30mm driver, the wire was broken inside the driver. I carefully desoldered and opened the driver, then unwinded a bit of the EXTREMELY thin enameled wire which was routed at the side of the membrane (not the coil!). Resoldered everything and it worked but the impedance changed 1.5ohms which is quite a lot in 32ohm headphones (like the grados). Imho this resulted in a slight channel imbalance but I haven't had time to repeat the procedure on the other driver.

I'm not sure how easy Grado drivers are to source but you could just replace the driver. (After possibly breaking it in a repair attempt smily_headphones1.gif )
post #19 of 21
Thread Starter 

Just to be clear, that " . " was the period at the end of the sentence, not a decimal point.

 

The bad driver just read   " 1 " .

 

poormxdad

post #20 of 21
Different multimeters display this differently. My favourite meter displays "1." but my other meters might just show "1", I haven't paid attention to that.
Simple question. What does it display when you hold the probes in the air?
Edited by UnknownAX - 5/12/14 at 3:21pm
post #21 of 21
Thread Starter 
Quote:
Originally Posted by UnknownAX View Post

Simple question. What does it display when you hold the probes in the air?

 

My phone number...

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