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Author Topic:  **FIXED** My Goodrich Match-Bro Died
Jack Stoner


From:
Inverness, Fl
Post Posted 1 Oct 2016 2:41 am     Reply with quote

My Match-Bro has developed a problem, I'm assuming because of using a dead battery. It was working but output had lowered due to low battery voltage. I installed two new (new unopened package) 9VDC batteries and tested it and no output. I checked the batteries and one of the two new batteries was dead (0 V). I replaced the defective battery and tried it again but still no output in the Guitar (bypass) mode. I switched to Dobro mode and it is howling (oscillating) and I can vary the tone with the Timbre control. I changed the op-amp as it is the only "plug in" component but it didn't make any difference. Nothing else I can do without a schematic.

I e-mailed the new Goodrich company about repair but still waiting for a response.

Sad Sad
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Last edited by Jack Stoner on 16 Oct 2016 6:05 am; edited 1 time in total
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Bill Ferguson


From:
Norcross, GA USA
Post Posted 1 Oct 2016 4:23 am     Reply with quote

Jack,
CALL Kevin at Goodrich. He usually gets in around 9am PST

760-547-1260
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AUTHORIZED GeorgeL's, Goodrich & Telonics Dealer: 1993 Green Emmons D-10 LeGrande w/ Emmons 108 pickups, 2004 Mahogany Carter D-10 w/ Lawrence XR16 pickups, 1989 Zumsteel D-10 w/ Alumitone pickups, Goodrich or Telonics Volume Pedal, George L's Cable & Strings, Peavey Nashville 112 (I have 2), Peavey Session 115 and a Telonics Combo 112
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Jack Stoner


From:
Inverness, Fl
Post Posted 1 Oct 2016 5:10 am     Reply with quote

Bill, I e-mailed them around 9am Friday (California time). I would have expected to get a response.
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Bill Ferguson


From:
Norcross, GA USA
Post Posted 1 Oct 2016 7:03 am     Reply with quote

Jack, Friday is Kevin's busiest day.

that is the day he does all of his packing shipping and billing.

you would get better results if you will call him on Monday
_________________
AUTHORIZED GeorgeL's, Goodrich & Telonics Dealer: 1993 Green Emmons D-10 LeGrande w/ Emmons 108 pickups, 2004 Mahogany Carter D-10 w/ Lawrence XR16 pickups, 1989 Zumsteel D-10 w/ Alumitone pickups, Goodrich or Telonics Volume Pedal, George L's Cable & Strings, Peavey Nashville 112 (I have 2), Peavey Session 115 and a Telonics Combo 112
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kevin ryan


From:
San Marcos, California
Post Posted 1 Oct 2016 8:15 am     Reply with quote

Hey Jack I resent an email I sent to you Friday morning check it out.... Sorry for not getting back sooner. Sometimes the contact form from our website doesn't pop and forward into our mailboxes.. Best to email me here: goodrichvp@gmail.com
Thanks Bill for watching out..!
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Jack Stoner


From:
Inverness, Fl
Post Posted 1 Oct 2016 8:24 am     Reply with quote

Thanks Kevin. I responded to your e-mail.

Here is the e-mail I got from Kevin (great of him to offer to check it out at no cost).

Quote:
Hey Jack, yeah those boxes are tricky to fix.. We do not have any schematics which makes this difficult... Even with schematics these boxes are old and caps dry out, cold solder joints... whatever... I have gotten lucky on a couple of them and not so much on a couple others... Not sure how much help I can be here... You can send it out no charge and I will take a look...
Kevin


I'm going to break out my O'scope and audio signal generator and see if I stumble across something.
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Carl Mesrobian


From:
Salem, Massachusetts, USA
Post Posted 1 Oct 2016 1:15 pm     Reply with quote

Jack Stoner wrote:
...

I'm going to break out my O'scope and audio signal generator and see if I stumble across something...


Smile
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--carl

"Just because I'm not paranoid doesn't mean they're not out to get me!" --Pat Farrell, Salem, MA
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Jack Stoner


From:
Inverness, Fl
Post Posted 1 Oct 2016 3:08 pm     Reply with quote

I "stumbled" across something.
There are two unknown components that only have one black band on them. One has zero ohms resistance one way and if I reverse the leads it has some resistance. The other one shows zero ohms both ways, although I checked them in the circuit. I need to disconnect one end of each and check again. Blake Hawkins (forumite) who is a retired Broadcast Engineer suspects they could either be some type of fuse or maybe a diode. I e-mailed Kevin and he will check when he gets to the shop Monday to see if he has anything on them.

I'll post the picture here in case someone recognizes what they are. One is next to the red wire (that one reads zero both ways).



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Greg Cutshaw


From:
Corry, PA, USA
Post Posted 1 Oct 2016 3:52 pm     Reply with quote

The ones I have run into are merely used as jumpers, thus the single black band for zero ohms. That way automatic insertion equipment can insert the jumper just like a resistor. I would expect both of these devices on your board to conduct in both directions. Otherwise they are pry defective.


https://en.wikipedia.org/wiki/Zero-ohm_link
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Jack Stoner


From:
Inverness, Fl
Post Posted 2 Oct 2016 2:28 am     Reply with quote

May be according to your link. May be a low current type of jumper as this is where the 18VDC or from the external power supply is connected to the circuit board (red wire). In this case it would sort of act as a fuse.

I'll know more after I get them out of the circuit where I can check them and not be affected by other circuit components.
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Jack Stoner


From:
Inverness, Fl
Post Posted 2 Oct 2016 5:37 am     Reply with quote

As Greg pointed out those are "zero ohm" resistors. Thanks Greg.

However, those are not what I suspected as the problem. So on to other things.
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Greg Cutshaw


From:
Corry, PA, USA
Post Posted 2 Oct 2016 6:29 am     Reply with quote

My Sencore Cricket transistor tester can check those transistors in circuit and also identify them as NPN/PNP for gain as can many other testers. Obviously the decoupling and signal caps can be checked with a meter or bridge starting with the electrolytic ones first. It's tedious but worthwhile to plow through all the components until you find the problem. Let us know what you find!
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Mike Wheeler


From:
Delaware, Ohio, USA
Post Posted 2 Oct 2016 7:17 am     Reply with quote

Jack, those are carbon composition jumpers...and should measure zero ohms in or out of the circuit...any value measured would indicate damage. I'd pull one end loose and re-test.

I suspect you'll find one of them is defective.
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Mike
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Jack Stoner


From:
Inverness, Fl
Post Posted 2 Oct 2016 7:24 am     Reply with quote

Mike, I did remove one end of each of those and then measure.

Greg, all the transistors in the MatchBro (at least the one I have) are all MPSA18 NPN transistors.
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Lee Warren


From:
Nashville, Tennessee, USA
Post Posted 2 Oct 2016 4:38 pm     Reply with quote

Following this thread, as my Matchbro is also acting up.
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Bob Lawrence


From:
Beaver Bank, Nova Scotia, Canada
Post Posted 2 Oct 2016 7:53 pm     Reply with quote

@ Jack Stoner

Just remember you are troubleshooting a EQ circuit .


I think I still have a schematic that I made years ago . It's fairly complete but it has not been checked for accuracy but could put you in the ball park.

Bob
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Jack Stoner


From:
Inverness, Fl
Post Posted 3 Oct 2016 2:25 am     Reply with quote

Anything, even a partial schematic would help. I'm just groping around now, trying to follow the signal path. I suspect voltage (or lack of) caused the problem since it was working until I put in a dead battery.
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Bob Lawrence


From:
Beaver Bank, Nova Scotia, Canada
Post Posted 3 Oct 2016 6:36 am     Reply with quote

Ok geive me a few days to see what I have. I know it's not complete because I borrowed the MatchBro to make the schematic and I had to return it before I could get it all done. ALso, this was back around 2005 so I don't know what I have after a bunch of MS Windows upgrades since then.

Here is a picture of the board I had at the time.


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Franklin D10, Telonics (E9)True Tone(C6) pickups, Fender Steel King , Evans (FET 500LV), Nashville 400, amp's, Telonics FP100 volume pedal, PodXT(effects only), Boss RV3(delay & reverb),Steel Guitar Black Box,Bill Lawrence cables, Walker Seat,Peterson Flip Tuner, IVL Steel Rider, IK Multimedia IRig Pro DUO for recording.
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Bob Lawrence


From:
Beaver Bank, Nova Scotia, Canada
Post Posted 3 Oct 2016 7:25 am     Matchbro Schematic Reply with quote

Here is the paper version of the schematic I drew . I also made a version with computer software around the same time. But! like I mentioned earlier I had to give the Matchbro unit (that I borrowed), back before I could finish the project. Therefore, I had to make the drawings from pictures and had no way to verify anything. Sad


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Bob Lawrence


From:
Beaver Bank, Nova Scotia, Canada
Post Posted 3 Oct 2016 7:54 am     Reply with quote

============================================
Op Amp:
Motorola MC34182P Low Power, High Slew Rate, Wide Bandwidth, JFET Input Operational Amplifier.
=============================================
Transistor : J113 = NTE469
Industry Number : J113
NTE Device Number: NTE469
JFET-N-CHAN CHOPPER/SW, TO-92

============================================
Transistor: MPSA18
NTE Device Number: NTE47
T-NPN,SI LO NOISE AMP,TO-92
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Franklin D10, Telonics (E9)True Tone(C6) pickups, Fender Steel King , Evans (FET 500LV), Nashville 400, amp's, Telonics FP100 volume pedal, PodXT(effects only), Boss RV3(delay & reverb),Steel Guitar Black Box,Bill Lawrence cables, Walker Seat,Peterson Flip Tuner, IVL Steel Rider, IK Multimedia IRig Pro DUO for recording.


Last edited by Bob Lawrence on 3 Oct 2016 7:57 am; edited 1 time in total
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Bob Lawrence


From:
Beaver Bank, Nova Scotia, Canada
Post Posted 3 Oct 2016 7:56 am     Reply with quote

@Jack Stoner

re:Greg, all the transistors in the MatchBro (at least the one I have) are all MPSA18 NPN transistors.


The board I borrowed had 2 J113 JFET's

Transistor : J113 = NTE469
Industry Number : J113
NTE Device Number: NTE469
JFET-N-CHAN CHOPPER/SW, TO-92
_________________
Franklin D10, Telonics (E9)True Tone(C6) pickups, Fender Steel King , Evans (FET 500LV), Nashville 400, amp's, Telonics FP100 volume pedal, PodXT(effects only), Boss RV3(delay & reverb),Steel Guitar Black Box,Bill Lawrence cables, Walker Seat,Peterson Flip Tuner, IVL Steel Rider, IK Multimedia IRig Pro DUO for recording.
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Bob Lawrence


From:
Beaver Bank, Nova Scotia, Canada
Post Posted 3 Oct 2016 8:11 am     Reply with quote

Data Sheet : MC34182P

http://pdf1.alldatasheet.com/datasheet-pdf/view/12085/ONSEMI/MC34182P.html
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Franklin D10, Telonics (E9)True Tone(C6) pickups, Fender Steel King , Evans (FET 500LV), Nashville 400, amp's, Telonics FP100 volume pedal, PodXT(effects only), Boss RV3(delay & reverb),Steel Guitar Black Box,Bill Lawrence cables, Walker Seat,Peterson Flip Tuner, IVL Steel Rider, IK Multimedia IRig Pro DUO for recording.
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Bob Lawrence


From:
Beaver Bank, Nova Scotia, Canada
Post Posted 3 Oct 2016 8:16 am     Reply with quote

Components - Board View



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Jack Stoner


From:
Inverness, Fl
Post Posted 3 Oct 2016 9:19 am     Reply with quote

WOW!

The one you had isn't exactly the same - but very close and will really help.

One thing I notice is yours only had one "zero ohms" resistor where mine has two.

Thanks again for all the help.
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Lee Baucum


From:
McAllen, Texas (Extreme South) The Final Frontier
Post Posted 3 Oct 2016 9:38 am     Reply with quote

Good luck to you, Jack. I hope we don't read about your Match-Bro in the "Gone Home" section of the Forum!

Razz

Lee, from South Texas
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