Superstar 3900 low light/power issue

A forum for the discussion of matters of a technical nature. All such activities are undertaken at the readers discretion and own risk. If you don't know what you are doing, don't blame us if it all goes wrong!
Post Reply
jellyhead
Regular
Regular
Posts: 14
Joined: 16 Dec 2013, 17:57

Superstar 3900 low light/power issue

Post by jellyhead » 25 May 2019, 02:52

Hi, I brought a 2nd hand 3900 (my second one) and plugged the frequency counter in the back. The lights on the front are really dim and it seems it has a power issue. I then pugged the FC into my st 3900 (which was working ok) and im now getting the same problem!

1) are the Superstar FC's compatible on all 3900 models?
2) Can the FC be repaired?
3) Can anyone advise what the issue could be and is this an easy fix?

Cheers

Jellyhead

User avatar
cb4ever104
Veteran
Veteran
Posts: 4877
Joined: 28 Jul 2011, 21:26
Location: Alicante , España

Re: Superstar 3900 low light/power issue

Post by cb4ever104 » 26 May 2019, 09:00

Hi.

1) I'm pretty sure the external counters are all the same. I think there's about 4 or 5 different brand names , but they look to be all the same.

2) There's a schematic for it , so I'd say yes , although I've never had to try and open one. I'm not at home , so I can't look at mine.

3) Maybe a zenor , or something that's gone ?

Sammy
30TM060
Paul aka "Sammy". (108) PY60 Old Paisley DX Group (RIP Rab Markie)
Ex GM0 , now EA5 .
Handle "Fortune Hunter" back in "the day"
Radios ....? Anything that says "TAIWAN R.O.C" on the back.

User avatar
astradyne
Moderator
Moderator
Posts: 8208
Joined: 14 Jun 2010, 09:28
Location: Dunny On The Wolds
Contact:

Re: Superstar 3900 low light/power issue

Post by astradyne » 26 May 2019, 12:55

cb4ever104 wrote:
26 May 2019, 09:00
Hi.

1) I'm pretty sure the external counters are all the same. I think there's about 4 or 5 different brand names , but they look to be all the same.

2) There's a schematic for it , so I'd say yes , although I've never had to try and open one. I'm not at home , so I can't look at mine.

3) Maybe a zenor , or something that's gone ?

Sammy
Definitely an issue with the counter Sammy. It appears to have caused damage to his radio's.

Jellyhead. Did you own the counter beforehand? Or was it supplied with the second 3900? As Sammy said, they're basically a generic counter available under several different brand names. The only difference being the older model has a red display. Later models have green and blue displays. They're a plug and play unit and will fit all versions of the 3900's. You can also buy a wiring harness (I think Sammy sells them) which can be retrofitted into older radio's.

Anyhow, more investigation is needed. Check the counter thoroughly with a multimeter. Something is obviously wrong with it. If you report back your findings we'll be able to help further.
Never, ever, ever....bloody anything ever!

Far too many radio's to list here. But I do own a legal one...

User avatar
astradyne
Moderator
Moderator
Posts: 8208
Joined: 14 Jun 2010, 09:28
Location: Dunny On The Wolds
Contact:

Re: Superstar 3900 low light/power issue

Post by astradyne » 26 May 2019, 13:02

Here are a few things which may assist you.

http://www.cbtricks.com/radios/galaxy/fc347/index.htm
You do not have the required permissions to view the files attached to this post.
Never, ever, ever....bloody anything ever!

Far too many radio's to list here. But I do own a legal one...

User avatar
cb4ever104
Veteran
Veteran
Posts: 4877
Joined: 28 Jul 2011, 21:26
Location: Alicante , España

Re: Superstar 3900 low light/power issue

Post by cb4ever104 » 26 May 2019, 15:59

Also. Does the DIM button make the display even dimmer ?
30TM060
Paul aka "Sammy". (108) PY60 Old Paisley DX Group (RIP Rab Markie)
Ex GM0 , now EA5 .
Handle "Fortune Hunter" back in "the day"
Radios ....? Anything that says "TAIWAN R.O.C" on the back.

User avatar
13EL121
Super Member
Super Member
Posts: 426
Joined: 16 Sep 2008, 20:55
Call Sign: 13DA121
Location: Germany
Contact:

Re: Superstar 3900 low light/power issue

Post by 13EL121 » 27 May 2019, 05:56

Check voltage regulator on the counter PCB.
And have a look here...

https://youtu.be/rkJjs9tIpew

Post Reply