Roberts Transistor Radio R200. - UK Vintage Radio Repair and Restoration Discussion Forum

Haggis2506 · 25th Feb 2023, 1:00 pm

Hi all i know everyone has seen this thread a million times,but im in need of help with restoring a roberts r200 radio.Ive replaced all the plessy caps,but the the back side of the board seems to had components missing and there is a resistor on it as well.Could somone be able to look at the inc pictures and tell me if i have missing components the serial is v 105295,thanks again.

Cobaltblue · 25th Feb 2023, 1:08 pm

Hi and welcome to the forum.

If you dont already have the service information it can be obtained here: https://www.service-data.com/product...24/7337/t15724

Cheers

Mike T

Haggis2506 · 25th Feb 2023, 1:37 pm

Nice one Mike i will have a look now

Haggis2506 · 25th Feb 2023, 4:15 pm

thank you for the link, im checking the resistors after replacing the plessy caps.The resistor count is 25 resistors and i seem to have an extra one under the board and one on the ferite rod which are not showing on the circuit diagram.What could be the reason for this? also the speaker wires from the the dial are soldered onto the board,should they not be on the speaker? as there is nothing connected to the speaker,also i noticed the red legs from the af 117s had all been disconnected.I understand the one of the legs if disconnected on the af 117 might help,not sure i will have to check the diagram again but i think it was the shield leg.any idea on these resistors guys,could someone maybe have tried to mod this in any way,i would appreciate any help at all.thanks in advance and sorry for being a pain,im a total beginner .

Andrewausfa · 25th Feb 2023, 5:02 pm

Hi,

No other components on the back of the PCB, just that resistor.

You don't say if the radio works/no sound/draws no current/no voltage on the PCB etc.

Andrew

Haggis2506 · 25th Feb 2023, 5:13 pm

Hi andrew thanks for your response,ive ordered a pp9 battery which should be here soon,but i did hook it up to a small 9v battery from my other meter i dont have any other way to inject voltage atm.i tested the battery leads for contnuity and it was ok it also showed 9v at the other end but nothing just silent.Once my battery arrives i will check the board for inc voltage,thanks again.

ms660 · 25th Feb 2023, 5:35 pm

The component in the ferrite rod photo in Post#4 looks like a capacitor, possibly C4 (20pF) in the third main version.

Lawrence.

60 oldjohn · 25th Feb 2023, 5:47 pm

On the schematic version the op is using it is listed as C3 40pf looks like possibly 42pf to me. Anyway whatever it is it is meant to be there.

I see the schematic I am referring to has been taken down to comply with forum rules.

John.

Haggis2506 · 25th Feb 2023, 6:36 pm

Thanks laurence and john,ive been afk a while.Thanks for that i really wasnt sure about the resistor or capacitor,it obv colour coded like a resistor but i cant make out the colours il post a picture,regardless thanks so much for your help so far,i was wondering if the resistor in the first picture is supposed to be there because im counting 25 resistors on the board as per diagram and there is one on the back of the board and the speaker wires are soldered on to the board as well but there is nothing connecting to the speakers.There is a green and red wire but i believe that for a jack.

music-centre · 25th Feb 2023, 6:46 pm

the speaker wires from the the dial are soldered onto the board,should they not be on the speaker? as there is nothing connected to the speaker

Hi,
Could you put on some pictures of the wiring to the speaker please?

Simon Gittins · 25th Feb 2023, 6:49 pm

The AF117 and similar transistors are often a problem, there are many threads about them; cutting the screen lead may help as in post #2 of this thread:
https://vintage-radio.net/forum/showthread.php?t=162649

Haggis2506 · 25th Feb 2023, 6:59 pm

As far as im aware the the red/green and black and red wires all split,two are for the jack and to should be connected to the speaker i believe.They are not though they are soldered to the board? The red wire is soldered to this resistor and the black as seen just onto the board as well.Thanks again lads really appreciate this

Haggis2506 · 25th Feb 2023, 7:02 pm

Thanks for the link simon i have been reading up on this,i just want to get some sign of life then i guess i can move on to the transistors.Thanks again

music-centre · 25th Feb 2023, 7:03 pm

Quote:

Originally Posted by Haggis2506

thank you for the link, im checking the resistors after replacing the plessy caps.The resistor count is 25 resistors and i seem to have an extra one under the board and one on the ferite rod which are not showing on the circuit diagram.What could be the reason for this? [also the speaker wires from the the dial are soldered onto the board,should they not be on the speaker? as there is nothing connected to the speaker],also i noticed the red legs from the af 117s had all been disconnected.I understand the one of the legs if disconnected on the af 117 might help,not sure i will have to check the diagram again but i think it was the shield leg.any idea on these resistors guys,could someone maybe have tried to mod this in any way,i would appreciate any help at all.thanks in advance and sorry for being a pain,im a total beginner .

HI,
Could you put on some pictures of the wiring to the speaker Please?

Haggis2506 · 25th Feb 2023, 7:08 pm

Yes music centre ive just made a post,i think admin is just approving it

Sideband · 25th Feb 2023, 7:36 pm

If there are no wires connected to the speaker, you won't get any sound! I'd sort those out first otherwise you'll get nowhere.

Haggis2506 · 25th Feb 2023, 7:46 pm

yes sideband,the wires from the volume control i thought go straight to the speaker? but they are soldered onto the board,i did make a post with photos,just awaiting approval

Haggis2506 · 25th Feb 2023, 8:00 pm

There are 4 wires coming from the dial and 2 i believe are for a jack,Green and red.The black and the red and black are for the speaker,here i see the red and black attached to the board,the red and green are free atm as i have the unit to pieces.thanks again for all the help.

ms660 · 25th Feb 2023, 8:22 pm

Quote:

Originally Posted by Haggis2506

The red and black wire speakers

They look like the wires from the volume control, the extra resistor on the track side of the board could be the one mentioned in the Trader sheet which was connected between the junction of X2,C23 and R8,R14.

Lawrence.

Haggis2506 · 25th Feb 2023, 8:41 pm

Oh great ms660,sorry to be a noob but where are the actual wires for the speakers? in all pictures i see they are red and black,thanks again.

25th Feb 2023, 1:00 pm	#1
Haggis2506 Triode Join Date: Feb 2023 Location: Stoke-on-Trent, Staffordshire, UK. Posts: 27	Roberts Transistor Radio R200. Hi all i know everyone has seen this thread a million times,but im in need of help with restoring a roberts r200 radio.Ive replaced all the plessy caps,but the the back side of the board seems to had components missing and there is a resistor on it as well.Could somone be able to look at the inc pictures and tell me if i have missing components the serial is v 105295,thanks again. Attached Thumbnails

25th Feb 2023, 1:37 pm	#3
Haggis2506 Triode Join Date: Feb 2023 Location: Stoke-on-Trent, Staffordshire, UK. Posts: 27	Re: Roberts Transister radio r 200 Nice one Mike i will have a look now

25th Feb 2023, 5:02 pm	#5
Andrewausfa Octode Join Date: Dec 2010 Location: St Ives, Cambridgeshire, UK. Posts: 1,180	Re: Roberts Transister radio r 200 Hi, No other components on the back of the PCB, just that resistor. You don't say if the radio works/no sound/draws no current/no voltage on the PCB etc. Andrew __________________ Invisible airwaves crackle with life. Or they should do. BVWS Member

25th Feb 2023, 5:13 pm	#6
Haggis2506 Triode Join Date: Feb 2023 Location: Stoke-on-Trent, Staffordshire, UK. Posts: 27	Re: Roberts Transister radio r 200 Hi andrew thanks for your response,ive ordered a pp9 battery which should be here soon,but i did hook it up to a small 9v battery from my other meter i dont have any other way to inject voltage atm.i tested the battery leads for contnuity and it was ok it also showed 9v at the other end but nothing just silent.Once my battery arrives i will check the board for inc voltage,thanks again. Last edited by Haggis2506; 25th Feb 2023 at 5:27 pm.

25th Feb 2023, 5:35 pm	#7
ms660 Dekatron Join Date: Apr 2011 Location: Cornwall, UK. Posts: 13,454	Re: Roberts Transister radio r 200 The component in the ferrite rod photo in Post#4 looks like a capacitor, possibly C4 (20pF) in the third main version. Lawrence. Last edited by ms660; 25th Feb 2023 at 5:37 pm. Reason: extra info

25th Feb 2023, 1:08 pm	#2
Cobaltblue Moderator Join Date: Dec 2010 Location: Exeter, Devon and Poole, Dorset UK. Posts: 6,879	Re: Roberts Transister radio r 200 Hi and welcome to the forum. If you dont already have the service information it can be obtained here: https://www.service-data.com/product...24/7337/t15724 Cheers Mike T __________________ Invisible airwaves crackle with life or at least they used to Mike T BVWS member. www.cossor.co.uk

25th Feb 2023, 4:15 pm	#4
Haggis2506 Triode Join Date: Feb 2023 Location: Stoke-on-Trent, Staffordshire, UK. Posts: 27	Re: Roberts Transister radio r 200 thank you for the link, im checking the resistors after replacing the plessy caps.The resistor count is 25 resistors and i seem to have an extra one under the board and one on the ferite rod which are not showing on the circuit diagram.What could be the reason for this? also the speaker wires from the the dial are soldered onto the board,should they not be on the speaker? as there is nothing connected to the speaker,also i noticed the red legs from the af 117s had all been disconnected.I understand the one of the legs if disconnected on the af 117 might help,not sure i will have to check the diagram again but i think it was the shield leg.any idea on these resistors guys,could someone maybe have tried to mod this in any way,i would appreciate any help at all.thanks in advance and sorry for being a pain,im a total beginner . Attached Thumbnails Last edited by Cobaltblue; 25th Feb 2023 at 5:23 pm. Reason: Rule compliance B8

25th Feb 2023, 5:47 pm	#8
60 oldjohn Dekatron Join Date: Dec 2004 Location: East Yorkshire, UK. Posts: 3,989	Re: Roberts Transister radio r 200 On the schematic version the op is using it is listed as C3 40pf looks like possibly 42pf to me. Anyway whatever it is it is meant to be there. I see the schematic I am referring to has been taken down to comply with forum rules. John. __________________ My favourite text message "I'll be there in five minutes, if not read again" Last edited by 60 oldjohn; 25th Feb 2023 at 5:53 pm.

25th Feb 2023, 6:36 pm	#9
Haggis2506 Triode Join Date: Feb 2023 Location: Stoke-on-Trent, Staffordshire, UK. Posts: 27	Re: Roberts Transister radio r 200 Thanks laurence and john,ive been afk a while.Thanks for that i really wasnt sure about the resistor or capacitor,it obv colour coded like a resistor but i cant make out the colours il post a picture,regardless thanks so much for your help so far,i was wondering if the resistor in the first picture is supposed to be there because im counting 25 resistors on the board as per diagram and there is one on the back of the board and the speaker wires are soldered on to the board as well but there is nothing connecting to the speakers.There is a green and red wire but i believe that for a jack.

25th Feb 2023, 6:46 pm	#10
music-centre Heptode Join Date: Sep 2007 Location: Brentwood, Essex, UK. Posts: 687	Re: Roberts Transister radio r 200 the speaker wires from the the dial are soldered onto the board,should they not be on the speaker? as there is nothing connected to the speaker Hi, Could you put on some pictures of the wiring to the speaker please?

25th Feb 2023, 6:49 pm	#11
Simon Gittins Heptode Join Date: Jan 2006 Location: Cornwall, UK. Posts: 506	Re: Roberts Transister radio r 200 The AF117 and similar transistors are often a problem, there are many threads about them; cutting the screen lead may help as in post #2 of this thread: https://vintage-radio.net/forum/showthread.php?t=162649

25th Feb 2023, 6:59 pm	#12
Haggis2506 Triode Join Date: Feb 2023 Location: Stoke-on-Trent, Staffordshire, UK. Posts: 27	Re: Roberts Transister radio r 200 As far as im aware the the red/green and black and red wires all split,two are for the jack and to should be connected to the speaker i believe.They are not though they are soldered to the board? The red wire is soldered to this resistor and the black as seen just onto the board as well.Thanks again lads really appreciate this Attached Thumbnails

25th Feb 2023, 7:02 pm	#13
Haggis2506 Triode Join Date: Feb 2023 Location: Stoke-on-Trent, Staffordshire, UK. Posts: 27	Re: Roberts Transister radio r 200 Thanks for the link simon i have been reading up on this,i just want to get some sign of life then i guess i can move on to the transistors.Thanks again

25th Feb 2023, 7:08 pm	#15
Haggis2506 Triode Join Date: Feb 2023 Location: Stoke-on-Trent, Staffordshire, UK. Posts: 27	Re: Roberts Transister radio r 200 Yes music centre ive just made a post,i think admin is just approving it

25th Feb 2023, 7:36 pm	#16
Sideband Dekatron Join Date: Oct 2003 Location: Croydon, Surrey, UK. Posts: 7,580	Re: Roberts Transister radio r 200 If there are no wires connected to the speaker, you won't get any sound! I'd sort those out first otherwise you'll get nowhere. __________________ There are lots of brilliant keyboard players and then there is Rick Wakeman.....

25th Feb 2023, 7:46 pm	#17
Haggis2506 Triode Join Date: Feb 2023 Location: Stoke-on-Trent, Staffordshire, UK. Posts: 27	Re: Roberts Transister radio r 200 yes sideband,the wires from the volume control i thought go straight to the speaker? but they are soldered onto the board,i did make a post with photos,just awaiting approval

25th Feb 2023, 8:00 pm	#18
Haggis2506 Triode Join Date: Feb 2023 Location: Stoke-on-Trent, Staffordshire, UK. Posts: 27	Re: Roberts Transister radio r 200 There are 4 wires coming from the dial and 2 i believe are for a jack,Green and red.The black and the red and black are for the speaker,here i see the red and black attached to the board,the red and green are free atm as i have the unit to pieces.thanks again for all the help. Attached Thumbnails Last edited by Haggis2506; 25th Feb 2023 at 8:22 pm.

25th Feb 2023, 8:41 pm	#20
Haggis2506 Triode Join Date: Feb 2023 Location: Stoke-on-Trent, Staffordshire, UK. Posts: 27	Re: Roberts Transister radio r 200 Oh great ms660,sorry to be a noob but where are the actual wires for the speakers? in all pictures i see they are red and black,thanks again.