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Post by jordax on Jun 4, 2016 8:41:35 GMT -5
Hi all.
This will be my first attempt at repair something of this scale. Went out and got myself a magnum 2006 solder station for the finer word.
I read the thread on the SR807, and was wondering if the parts will be the same as my Q6061 and Q6051 are also shorted out.
I used the diode beep test on my DMM. Q6011 seems fine, but R6101 and other white 3 prong resistors show inconsistent readings although they say R22K on the front. No markings on the transistors.
Any help will be appreciated.
Regards
Jordax
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Post by mastertech on Jun 5, 2016 9:02:22 GMT -5
These parts are from the FR channel. Part numbers are as follows:
Q6061 = MP130S
Q6051 = NM130S
R6101 = 0.22 ohm, 3 watt
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Post by jordax on Jun 5, 2016 10:32:29 GMT -5
Thanks, I will check tomorrow if I can source the transistors. Are there alternatives to those?
What DMM reading should I get between centre pin and side pins on the resistors?
Much appreciated.
P.S. Is it possible that the short, shown on the transistor legs, can be caused by something else on the circuit, or are those 2 transistors definitely wasted? I'd hate to cut perfectly good transistors which I might struggle to find.
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Post by mastertech on Jun 5, 2016 11:01:11 GMT -5
There are always alternatives but you should usually try to source the same replacements first.
I am assuming these are dual emitter resistors so you should have 0.22 ohms from the center to either outer pin.
A short reading on a component can always be possibly caused by another component. When ever you encounter a short reading you must remove the component and retest to verify. I would not cut.
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Post by jordax on Jun 5, 2016 11:08:17 GMT -5
Good advice, I will start disassembly tonight and keep you posted.
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Post by jordax on Jun 5, 2016 15:19:23 GMT -5
I had a closer look after removing the transistors. They do have markings and they do measure shorts all round.
Q6051 = Toshiba C5198 O905
Q6061 = Toshiba A1941 O905
R6101 = open on one side and 0.9 ohm on the other. (probably the cause of broken transistors?)
All other similar resistors reads 0.9 ohm on each side.
Any other components I should inspect closer?
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Post by mastertech on Jun 5, 2016 17:15:30 GMT -5
I have attached an image of all the parts that should also be tested in that channel. After done with testing, if you remove all the bad parts you can try operating the unit and see if it stays on. But it must be assembled to test run.  |
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Post by jordax on Jun 6, 2016 3:06:39 GMT -5
Thanks for the diagram.
I have found one other broken component.
R6071 = 100ohm (1/4w)
Now, to find the components... Living where I do will make this very challenging.
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Post by mastertech on Jun 6, 2016 8:48:47 GMT -5
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Post by jordax on Jun 7, 2016 1:28:39 GMT -5
Thanks, but most do not ship here.
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