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-   -   Trying to revive a Goodmans One Ten receiver (https://www.vintage-radio.net/forum/showthread.php?t=171539)

CrazySwede 30th Sep 2020 7:09 am

Trying to revive a Goodmans One Ten receiver
 
4 Attachment(s)
Hi there!
Just won this thing in an online auction here in Sweden for 10 euros.
Have so far just had time to do a quick look through. Lots of dust and some dead bugs, but under the crap it seems to be in pretty good physical shape. Very clean inside though (except for a dead bug jammed in the scale window. Poor thing).

After deciding that nothing looked scary under the hood I plugged it in and got a nice warm scale light but absolutely no sound in the speakers. Tried both A and B speaker connections and radio, aux and phono but just silence. Also worked the input buttons pretty good at no avail. So probably something is wrong electronically. Will start usual troubleshooting looking at fuses and clean contacts and controls. Have the service manuals so can check voltages.
But this being a piece of UK made gear I figured i would pop in here and se if any of you guys have any experience and input that could help me fix this beauty up. Thanks in advance!

David G4EBT 30th Sep 2020 8:53 am

Re: Trying to revive a Goodmans One Ten reciever
 
Welcome to the forum.

I don't recall having seen any Goodmans receivers mentioned on the forum, so can only suggest a few general checks you could carry out to try to narrow down in which sections of the receiver the fault(s) lie. Firstly, it's worth checking at the slider of the volume control (dual gang if stereo) with a signal tracer (or small amplifier) to see if you can hear any tuneable stations on the various wavebands. If so, that would mean that the RF, IF and detector stages are at least working.

As you get no audio to the speakers even when you input audio into the AUX and Phono sockets, it certainly seems like there is a fault/faults in the audio stages. Sometimes such equipment doesn't take kindly to being switched on with no speakers connected or mismatched non-original speakers, causing damaged to the output transistors/ICs.

As you have the manual, as you will know, a good place to start would be voltage checks, but if you're in luck and the RF/IF/Detector stages are indeed working, you could use a signal tracer to follow the audio signal through each stage of the audio section to try to pinpoint the fault.

Hope that might help a bit.

Good luck with it.

chriswood1900 30th Sep 2020 9:43 am

Re: Trying to revive a Goodmans One Ten reciever
 
Welcome to the forum.
The Goodmans 110 was a reasonable effort at producing a modern looking receiver. I owned one for a while and was pleased with its performance.
It has appeared before on the forum where part way down are links to the manuals. https://www.vintage-radio.net/forum/...ad.php?t=46056
Standard repair techniques should work, although it is mainly one large circuit board it is in sections. Check power supplies are present and see if you can hear anything at the tape outputs from the tuner or can produce any sound from the inputs. Don't rule out badly corroded switches and din plugs needing a good clean.
Good Luck

jjl 30th Sep 2020 10:43 am

Re: Trying to revive a Goodmans One Ten reciever
 
If the scale lamps PL2, 3, and 4 are lit, at least the mains fuse is intact. I can't find where these lamps take power from in the service manual, but given that they are 12V types they are probably powered from the +14.3V or -14.3V rail. In which case these supplies must be present.
I'd check the fuses in the +35V and -35V rails to the power amplifiers. Don't be tempted to just replace these if they are blown as they will have failed for a reason - most likely failure of output transistors for either power supply variant or rectifier diodes or smoothing capacitors for the earlier variant.

John

CrazySwede 30th Sep 2020 11:04 am

Re: Trying to revive a Goodmans One Ten reciever
 
2 Attachment(s)
Thanks for responding, guys!
How do I figure out if I have an early or later model?

Have some more pics of the internals here if it may give some clues?

jimmc101 30th Sep 2020 12:25 pm

Re: Trying to revive a Goodmans One Ten reciever
 
The four fuses on the bracket from the mains transformer suggest that yours is a later model. (See the manual I posted in the link above, pt1 page 6 and pt2 page 2).

Good luck with it.

Jim

jjl 30th Sep 2020 12:37 pm

Re: Trying to revive a Goodmans One Ten reciever
 
I see now that the scale lamps are powered from the 12V A.C. available between the 30V and 18V taps on the secondary of the mains transformer. This means that F6 on the later power supply circuit must be intact, but any of the +/- 13.4V and +/- 35V rails may be absent.

John

CrazySwede 30th Sep 2020 6:42 pm

Re: Trying to revive a Goodmans One Ten reciever
 
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A little progress!
Measured continuity over all fuses and the two 18v where open. Fuses were OK but the holders very oxidized. Cleaned them, popped the fuses back and turned it on and we have sound!

...but only static and a lot of popping. Now on to a thorough cleaning of the buttons and potentiometers.

vinrads 30th Sep 2020 7:28 pm

Re: Trying to revive a Goodmans One Ten reciever
 
That sounds promising a good clean of all the controls and switches should have it working , Mick.

Reelman 30th Sep 2020 8:55 pm

Re: Trying to revive a Goodmans One Ten receiver
 
Glad to hear you are making progress. When it is finally up and running there are a couple of points to be aware of: there will be a thump from the speakers when turning on, this is normal if unpleasant. However in the 20+ years I used mine it never damaged the speakers that were connected for the same Length of time. If you don’t like it then switch on to headphones first and then immediately to speakers. The volume control will be noisy by this time and because of a tapping on the track very difficult to find a replacement.

Other than the above mine never had a fault of any description.....

Peter

CrazySwede 1st Oct 2020 7:49 am

Re: Trying to revive a Goodmans One Ten receiver
 
Thanks for input, Peter.
Yup, that thump when powering up had me jumping. Good to read that it is a standard feature :-).

CrazySwede 2nd Oct 2020 2:57 pm

Re: Trying to revive a Goodmans One Ten receiver
 
2 Attachment(s)
Hmm, this puppy may be worse off than I first thought. A good deoxit clean of all breakers and controls have not helped at all.

Some symptoms so far:
- When I turn it on I get a solid thump in both speakers (happens booth on speaker1 and 2)
- I get no audio from AUX or Phono inputs
- Sometime I can get a loud static kind of loud screeching noise when activate L,M or K radio bands.
- When swithing input I get loud pops in the speakers
- When I get the loud noise described above this happens even if volume button is turned off completely.
- No audio in headphones either.

Going to move on now to check voltages.
One question: could the above described behaviour be a sign of that I still have problems with bad contact in the fuse holders that I described above?
On of them have been hard to get to so not sure if I have managed to clean off the corrosion.

Reelman 4th Oct 2020 11:39 am

Re: Trying to revive a Goodmans One Ten receiver
 
One additional problem you need to be aware of is that I think this uses “lockfit” transistors which are known to be unreliable and should be replaced by non-lockfit types. A search of the forum will produce suggested types.
You could try some signal injection directly to the PCB to try and isolate the faulty stage or stages.
Peter

stevehertz 4th Oct 2020 11:50 am

Re: Trying to revive a Goodmans One Ten receiver
 
1 Attachment(s)
There were quite a few Goodmans receivers in different guises, some with built in record decks. The three main (serious!) ones were the Module 90, 'One Ten', and the '150'. I started my hifi career with a Module 90 in 1976 (long gone) and I now have a 150 in my collection of vintage receivers. I am in the process of buying a One Ten from a friend. All models have been featured on here at various times. Out of interest, here's a photo of my restored 150. BTW, I would clean those switches again and with the power off operate them many times. You'd be surprised at how dirty and unresponsive to cleaning they can be sometimes. Best of luck.

Edit. Out of interest, I read or was told in the 70s that a rich Arab Sheikh had bought - I think it was thirty - Goodmans 150s and specified that they were all gold plated. What bits were gold plated I don't know, but anyway, it's a good and somewhat plausible story. I see no reason for someone to make up something so obscure.

david freeman 6th Oct 2020 7:56 pm

Re: Trying to revive a Goodmans One Ten receiver
 
The 150 is a superb sounding receiver.
It was the most powerful British made receiver when introducing in 1975.
Had excellent reviews in the HiFi press.

CrazySwede 6th Oct 2020 8:42 pm

Re: Trying to revive a Goodmans One Ten receiver
 
Thanks for input!
Have hit the pots and switches with another round of contact cleaning spray (ran out so need to get more) and replaced all fuses. They measured ok but just to be sure they're ok.
But still: only lights and no audio except for a thump on power up and some pops when hitting the switches.
Otherwise same symptoms as I described in an earlier post.
Will get another can of contact cleaner and give it one more try. But if third time is no charm with that method, I need some help to troubleshoot further. I have a multimeter and know the basics about measuring voltages and currents and continuity.
Is there by way to measure if a switch is bad? Any other possible causes that makes this thing quiet?

CrazySwede 7th Oct 2020 7:17 pm

Re: Trying to revive a Goodmans One Ten receiver
 
By the way, would it be possible to pop the buttons off the switches to get better access for the contact cleaning spray from the front side?
Some of them are hard to reach from inside (caps and stuff in the way of the hole in the back of the switches).
But don't want to break anything either...

jamesperrett 7th Oct 2020 10:56 pm

Re: Trying to revive a Goodmans One Ten receiver
 
Sounds like a problem with the preamplifier stages. If it affects both channels I'd look at the power supply first (which appears to be the supply associated with the fuses that you mention earlier). The diagram you posted shows the expected voltages at various points in the circuit so I'd start by checking with your meter that those voltages are as expected.

CrazySwede 8th Oct 2020 8:52 am

Re: Trying to revive a Goodmans One Ten receiver
 
4 Attachment(s)
Thanks for that advice, James!

I have started trying to measure voltages and so far I think they check out. This is the outgoing DC:s after the psu at points 13, 24, 25. But after that I have trouble interpreting the schematics and finding the right points to measure imortant voltages (no markings on the board).
Here“s where my inexperience starts to show :shrug:...

So if someone with more experince could take a peek at the schematics and give me a pointer where the important measure points in the different areas can be found I would very much appreciate it.:thumbsup:

If you tell me at which components to measure I should be able to locate using the layout sheet.

I have attached the servicemanual and the schematics. Also stitch the pages together to make it easier to read.

EDIT: noticed that the forum tool compressed the jpg-images so they may be hard to read. Here“s a shared G-drive folder with the originals.
https://drive.google.com/drive/folde...fX?usp=sharing



But I will also defenitely have to get more contact cleaner and have another go at the switches. Last night while trying more I found at some points/combination of switch presses I got some consistant noise and also a weak audio from the AUX which I had connected to a music source.

jamesperrett 9th Oct 2020 12:02 am

Re: Trying to revive a Goodmans One Ten receiver
 
My next suggestion would be to check the voltage on pins 14 and 7 of IC2 and IC3. Have you tried feeding a signal into the tape socket with the tape monitor switch engaged?

CrazySwede 12th Oct 2020 6:27 pm

Re: Trying to revive a Goodmans One Ten receiver
 
Sorry for slow updating on this. Anyhoo: have dumped another half a can of contact cleaner into the switches but no result.
Tried connecting a signal to tape input but not a sound.
Measured the IC:s as suggested and got:

IC 3
Pin 14: 13,7v
Pin 7: 1,3v

IC 2
Pin 14: 13,6v
Pin 7: 1,3v

This looks not right, right?
Should be +14,3v and -14,3v if I interpret the schematic right?
What now?
Thanks in advance for suggestions for further troubleshooting!

tony brady 12th Oct 2020 6:44 pm

Re: Trying to revive a Goodmans One Ten receiver
 
check the voltage on VT41. the negative voltage on IC2 & 3 is not correct.
the +13.6V is close enough on pin 14

CrazySwede 12th Oct 2020 6:59 pm

Re: Trying to revive a Goodmans One Ten receiver
 
Tony, thank you so much for advice and taking time to help this poor Swede out. Much appreciated! I have closed shop for tonight but will try to get that VT41 voltage checked tomorrow.

jamesperrett 12th Oct 2020 11:29 pm

Re: Trying to revive a Goodmans One Ten receiver
 
As Tony says, check VT41 and, if there are no volts on the collector or emitter, check the voltages on R169 and its associated smoothing capacitor. If the voltages on VT41 look correct you need to look for a broken connection between VT41 and the IC's.

CrazySwede 13th Oct 2020 6:33 pm

Re: Trying to revive a Goodmans One Ten receiver
 
Hi!
Here's some voltages. Hope I got it right :-)...
The transistor measurements are after markings on the PCB.

VT41
E: -1.33
B: -14,3
C: -25.6

VT40
E: 13.6
B: 14.3
C: 23.6

R169
-25.6

C151
24.7

Ē152
-25.6

R167
-18.6
- 14.6
Measured both sides.

So looks like the E-voltace on VT41 is way off or is my thinking off?

tony brady 13th Oct 2020 6:59 pm

Re: Trying to revive a Goodmans One Ten receiver
 
it looks like VT41 is faulty and should be replaced

CrazySwede 13th Oct 2020 8:25 pm

Re: Trying to revive a Goodmans One Ten receiver
 
Thanks! Good have a course of action. According to the parts list in the service manual it's an e5359 transistor. Have done a quick search but failed to find one for sale. Is it no longer manufactured? Any similar transistor that can replace it?

tony brady 13th Oct 2020 8:52 pm

Re: Trying to revive a Goodmans One Ten receiver
 
I think that's a Thorn part number. I don't know what the direct equivalent actually was - what package is it? TO92?

I would fit something like a ZTX753 which are easy to get and more than enough to do the job. just be careful with the pin outs

Chris55000 13th Oct 2020 10:30 pm

Re: Trying to revive a Goodmans One Ten receiver
 
Hi!

Looking at the pinout at the bottom of the power–supply circuit, VT40 and VT41, are plastic transistors of the TO92b type, and you'll find the BC639 (npn, VT40) and BC640 (PNP, VT41) will be ideal to replace the E5358 (npn) and the E5359 (PNP), and will fit the board exactly the same orientation as the original devices.

Please be aware tho', that simple emitter–follower series stabilisers of this type are NOT short–circuit proof, so take great care not to accidentally short–circuit the ±14V lines whilst making tests!

If either transistor fails immediately after replacing it, there could be an i.c. or decoupling capacitor(s) downstream of VT40 or VT41 defective!

Chris Williams

CrazySwede 14th Oct 2020 4:43 am

Re: Trying to revive a Goodmans One Ten receiver
 
Thanks for clearing this up. Yup, BC639 and BC640 seems to be easy to find. Since I will be paying shipment I could just as well order more stuff. Do you see any other suspects that I could add to the shopping list to have at hand if the VT41 is not the problem?

CrazySwede 19th Oct 2020 6:18 pm

Re: Trying to revive a Goodmans One Ten receiver
 
1 Attachment(s)
Hi, I'm back.
Finally got the replacement transistor I ordered.
So took a deep breath, trying not to think of how long it was since the last time I held a soldering iron, and went at it.
Thankfully the Goodmans engineers must have had future hifi restorers with big, clumpsy Swedish hands in mind when laying this board out. Not that hard to access and not to crowded. Phew!
Got the VT41 replacement in place, checked and behold: there was minus voltage on the rail again!

So held my breath and mumbled a quiet prayer through gritted teeth to new and ancient higher powers and pressed power...
Big thump in the speakers and then... MUSIC!

Man it was a long time since Bruce Springsteen (playing on my phone through aux input) sounded this good!

Tested tuner: check! (but the tuning did not like the chilled out workshop and was stuck. Simulating normal indor temp with a hairdryer made it move again)

Phono input: check! An old Link Wray record on the Lenco sounded really nice. The riaa in this thing means business.

So good old Goodmans is back from the dead! Now onto a proper cleanup and some new lamps.
Since I was paying more shipment than value of the transistors I also added on the order replacement capacitors for the big blue Erie supply reservoir caps (C144, C145).
Should I replace those or leave them in? The seem to be in good shape.
Any other preemptive actions to take to steer clear of future trouble?
I know a full recap probably would be advisable, but I m kind of a "if it ain't broken don't fix it"-guy

But all and all, I'm a happy camper right now.
And to you gentlemen who has adviced me in troubleshooting I owe a big thank you! ...and a pint or two if and when we cross paths!

Here's a video with "proof of life":

https://drive.google.com/folderview?...BmRmgzMFp2_R-B

tony brady 20th Oct 2020 8:04 am

Re: Trying to revive a Goodmans One Ten receiver
 
that looks really nice in white and a good result to get it working!

as you have the supply capacitors you may as well change them anyway observing correct polarity when you fit the new ones. those Erie caps are 45 years old at least and they can often leak from the vent.

other than changing any callins ( black) electrolytics ( if fitted) I would not do a full recap. do not be tempted to change any capacitors in the tuner section anyway ( except electrolytics) otherwise you will have to re-align the RF & IF stages and that requires test gear

really if it's working ok leave it alone and enjoy it as it is

CrazySwede 20th Oct 2020 10:43 am

Re: Trying to revive a Goodmans One Ten receiver
 
1 Attachment(s)
Thanks for advice. Ok, think I'll just replace the big Erie's as a starter.
But not entirely sure about the polarity on these guys. Cannot find any clear markings (maybe hidden under the clamps?). But am I guessing right that the red wires are terminated on a positive lead and the black is negative?

tony brady 20th Oct 2020 10:57 am

Re: Trying to revive a Goodmans One Ten receiver
 
one cap is for the positive supply and one for the negative. The red wire should be the positive supply. the black wire should be the negative. the tinned wire going from one cap to the other is the 0V.

there should be a red marking on the end of the cap painted on the rivet for the positive tag. be careful though as the cap on the negative line will have the red terminal connected to the 0V wire with the black wire connected to the -V terminal

CrazySwede 20th Oct 2020 11:06 am

Re: Trying to revive a Goodmans One Ten receiver
 
Ahh, so that what those red dots on the caps mean :-).
But as long as I match the red dotted tags on the old capacitors to positive marked tags on the new ones I am goood?

chriswood1900 20th Oct 2020 11:08 am

Re: Trying to revive a Goodmans One Ten receiver
 
In your picture the RH cap is red + pos green - neg, on the LH side Green is + and the black -, if I remember correctly Erie caps used a coloured dot on the terminal to denote polarity.

CrazySwede 20th Oct 2020 11:27 am

Re: Trying to revive a Goodmans One Ten receiver
 
Thanks, I think I got it now :)

turretslug 20th Oct 2020 2:30 pm

Re: Trying to revive a Goodmans One Ten receiver
 
When you come to unsolder/remove the original capacitors, check with a voltmeter to make sure that they are absolutely discharged- depending on the circuit design and the condition of the capacitors, charge can linger for a surprisingly long time after switch off. Even if they only measure a few volts some time after disconnecting power, they can still deliver a hefty current spike if soldering iron or cutters short to something and that can kill semiconductors all over the place.

A painful and embarrassing lesson that sticks in the mind....

CrazySwede 20th Oct 2020 2:58 pm

Re: Trying to revive a Goodmans One Ten receiver
 
Thank“s for the heads up about that. Will handle them and the iron with care.

Nickthedentist 20th Oct 2020 3:41 pm

Re: Trying to revive a Goodmans One Ten receiver
 
Well done for getting this lovely thing going again. I wonder how many ended up in Sweden? Was Goodmans well known there in the 1970s and earlier? Note that the "Goodmans" name that appears on cheap Chinese TVs etc. nowadays is nothing to do with the original company.

I rescued one a few years ago as it was going to be dumped, having been replaced with a little Philips micro system. It worked very well, though the controls always tended to crackle. I gave it away in the end to somebody whose own one had been destroyed in a flood.

I also had a Module 80 receiver with inbuilt GL-75 turntable once, which I was very fond of. The One-Ten was often found with the later GL-85 built in: https://www.picclickimg.com/d/l400/p...GL-85-with.jpg

Or sometimes a Garrard:
https://www.picclickimg.com/d/l400/p...rrard-Zero.jpg

N.

CrazySwede 20th Oct 2020 8:45 pm

Re: Trying to revive a Goodmans One Ten receiver
 
1 Attachment(s)
Hi!
I think Goodmans recievers are pretty rare over here. Never saw one before I bought this one. Thanks for sharing those nice pictures by the way.

Well tonight I replaced the reservoir capacitors with Nichicons of same capacitance. Not my finest hour with the soldering iron (still waiting for that one... :) ) but both the One Ten and yours truly survived the operation.

But man, new caps are really small compared to the seventies stuff. Had to makeshift a bushings solution for the new ones to fit the clamps.


Now onto the bulbs. Guess the service manual will have the specs for them listed.

CrazySwede 21st Oct 2020 12:35 pm

Re: Trying to revive a Goodmans One Ten receiver
 
1 Attachment(s)
Hmm, finding the right bulbs here in sweden was a bit harder than expected. My normal go-to webshop could not identify modern equivalent lamps for the scale and indicators when I sent them the parts number from the SM.

Do any of you guys happen to know what lamps to get and from where (that ships internationally if abroad)?

music-centre 21st Oct 2020 2:40 pm

Re: Trying to revive a Goodmans One Ten receiver
 
There is RS Components, 104-878 look ok for the 12v ones and 104-597 for the 14v ones? packs of 10 though and do check if they are suitable as I only had a quick look.
Steve.

CrazySwede 21st Oct 2020 5:46 pm

Re: Trying to revive a Goodmans One Ten receiver
 
Thanks Steve!
Yup, those seems to work. will order promptly.

CrazySwede 22nd Oct 2020 4:56 am

Re: Trying to revive a Goodmans One Ten receiver
 
On this matter: is there any way to access and change the stereo light and tuning gauge light from the inside or does the front have to come off?

CrazySwede 26th Oct 2020 7:45 pm

Re: Trying to revive a Goodmans One Ten receiver
 
1 Attachment(s)
While waiting for some lamps to show up, I did a bit of cleanup and oiled the cabinet. Turned out quite ok.
And of course I couldn't stop myself from hooking it up to my main system when I had indoors in the warmth (getting a bit chilly in the outhouse where the workshop is).
It really liked being hooked up to its fellow Brit, the Garrard Zero 100 :).

Rocking som CCR:
https://drive.google.com/file/d/10pL...w?usp=drivesdk


Attachment 218949

Nickthedentist 26th Oct 2020 8:49 pm

Re: Trying to revive a Goodmans One Ten receiver
 
That looks lovely!

Radio Wrangler 26th Oct 2020 8:59 pm

Re: Trying to revive a Goodmans One Ten receiver
 
They are a good looker, aren't they? That slide-rule tuning scale !

David

CrazySwede 26th Oct 2020 9:42 pm

Re: Trying to revive a Goodmans One Ten receiver
 
1 Attachment(s)
Yup, it's a classy looking piece of kit for sure!
But speaking about the tuning scale, this has an issue I hope you can assist me to sort out.
The tuning will only move to the right and not easily. Not at all to the left. Knob turns but not the scale indicator. Seems as if the variable capacitor gets stuck.
I thought this was caused by working in a chilled out outhouse and carefully applying heat with a hairdryer on the variable capacitor made it work.
Thought it would sort itself out coming into a warm house but problem persists.
The capacitors mount is a bit crooked, don't know if this is the cause and can be fixed.
Or is this old lubrication somewhere jamming moving parts?
Attachment 218953

Radio Wrangler 26th Oct 2020 11:47 pm

Re: Trying to revive a Goodmans One Ten receiver
 
The capacitor looks skewed on its mountings. That might indicate something wrong.

The slide bearings for the pointer in some sets can wear and grab a bit in one direction only.

FM tuning is done by that pot on the end of the variable capacitor. It tunes varactor diodes.

David


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