| Author |
Message |
    
Stanley
| | Posted on Wednesday, March 19, 2003 - 4:53 pm: | 
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Hi. I have one of those radios that I think is referred to as a Superstar Grant. It looks like your typical President Grant, except that it has a low/mid/high band switch, and am/fm/ssb modes.
The modifications for the Superstar 3900 seems to be the same for this radio, right down to the talkback one. But I can't seem to find D75 for the 2-way clarifier mod. I found R135, but not that darn diode! I figured it would be close R135, but the doesn't seem to be the case. I have no schematics to go by either. Can anyone help? Also, would a 5.6uH inductor give it more range? Thanks! |
Slowride
New member
Username: Slowride
Post Number: 1
Registered: 1-2005
| | Posted on Tuesday, March 22, 2005 - 5:11 am: |
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Problem with unlocking clarifier,I have a Superstar 3900 and I can't D75.I did the rest of the mod but wheres D75. It says its near VR15,I can't find that either. Is the mod wrong?? Or am I just blind. |
Joey
New member
Username: Joey
Post Number: 3
Registered: 2-2004
| | Posted on Saturday, March 26, 2005 - 2:42 pm: |
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I'm having the same probelm with my radio. I cannot find the D75. I got everything else. Just can't find the Diode. Hopefully somebody can help me in the right direction. |
Patzerozero
Advanced Member
Username: Patzerozero
Post Number: 616
Registered: 7-2004
| | Posted on Saturday, March 26, 2005 - 5:06 pm: |
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it may be underneath a big glob of wax. pick away at it carefully...don't have 1 here to look at, if nobody can get you info, i'll see if i have board layout somewhere. |
Joey
New member
Username: Joey
Post Number: 4
Registered: 2-2004
| | Posted on Sunday, March 27, 2005 - 7:40 am: |
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I already melted the wax. Still not there. If somebody with the same radio can tell me where it is or where it is near that would be great. |
2600
Advanced Member
Username: 2600
Post Number: 519
Registered: 7-2002
| | Posted on Sunday, March 27, 2005 - 11:28 pm: |
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For the Superstar 3900, I show a EPT3600-14 circuit board. No D75 to fool with on this one.
First remove D38. It's at the front edge of the circuit board right next to VR21.
VR21 is the one visible in this pic. R141 is changed to feed the "Fine" clarifier all the time, rather from the receive-only source as it comes. Here are VR21 and R141. You don't need to remove R141, just unsolder and (gently) pull the the long end lead wire from the hole.
There is an empty, unmarked hole in the pc board immediately to the rear of the hole you just pulled the long lead of R141 out of. Clear the solder from that hole. Insert the free end of R141 into this hole, and solder.
There are other ways to do the same thing on dozens of radios that use this pc board. This one is the simplest. The fewer things get disturbed, the less chance of accidentally disturbing something you didn't mean to.
73
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