Vintage GE clock radio not powering on

Reply

  #1  
Old 10-27-16, 11:08 PM
Member
Thread Starter
Join Date: Dec 2006
Location: usa
Posts: 1,367
Vintage GE clock radio not powering on

I have a vintage GE clock radio. No model number just date code 2643M. The only thing that comes on when plugged in is the 2 dots in the middle that seperate the hours from the minutes and the alarm on dot. Other than that nothing else works. None of the digits come on so can't even set the time. No sound in either AM or FM mode. Im thinking the transformer is bad but how do I test. The info on the transformer is 25A018 and it says tamradio on the side of the transformer. Other numbers are 166B2357-15 and M8640. What kind of transformer is it? is a step down or a step up? is it a AC to DC? You got the 2 black wires from the power cord come in and are soldered to the board. Then you got 2 red wires that go into the transformer. Then on the other side of the transformer you got 1 green and 1 yellow wire that go into the board. I assume the Red wires are the 120 A/C from the mains coming in from the board and then the yellow and green are the output side. I want to know what kind of transformer it is so I know what to put the multi meter on. The board that the transformer is mounted on says REV-6 289E0402.

 
Sponsored Links
  #2  
Old 10-28-16, 12:40 AM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 51,376
Upvotes Received: 206
Something is lighting on the display..... the transformer is good.
The yellow/green leads of the xfrmr should measure around 10-15 VAC.

What is the DC voltage listed on the red cap ? What does the DC voltage measure as ?
What is the DC voltage listed on the pink cap ? What does the DC voltage measure as ?
What is the number on the orange transistor ?
What is the number on the purple transistor ?
What is the number on the yellow transistor ?

Name:  13bf7698-7efd-4738-b744-9a0d994bc43a_zpsla43f53s.jpg~original.jpg
Views: 178
Size:  50.9 KB
 
  #3  
Old 10-28-16, 11:25 PM
Member
Thread Starter
Join Date: Dec 2006
Location: usa
Posts: 1,367
RED capacitor doesn't want to give me a reading or it reads 0.03UF and the rating on the cap is 470UF 16V but no voltage read. The Pink one is rated at 1000UF but it reads around 880-870UF. It keeps going down and voltage is 16V but nothing on meter voltage wise. This is with the caps removed from the board. All 3 black transistors are 3 prong they are all labeled 6002 -012 T 639. I can't get any ohm reading on the 3 transistors.
 

Last edited by flirty1; 10-28-16 at 11:47 PM.
  #4  
Old 10-31-16, 09:36 PM
Member
Thread Starter
Join Date: Dec 2006
Location: usa
Posts: 1,367
UPDATE I was finally able to get a reading on the 3 transistors. I had to put the meter on the diode setting and all three read in the upper 600s to the low 700s so they check out. Found another cap that is out of tolerance. It's a 10uf 35v and it's reading 7.80uf. Got caps ordered. Will replace these first and see what happens.
 
  #5  
Old 11-01-16, 07:20 AM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 51,376
Upvotes Received: 206
I was looking for a DC voltage reading on the caps with the unit plugged in.
Those caps rarely went bad in those units.

Did you confirm the AC voltage on the yellow and green transformer secondary leads ?
 
  #6  
Old 11-05-16, 10:22 PM
Member
Thread Starter
Join Date: Dec 2006
Location: usa
Posts: 1,367
I got it working again. I replaced the 3 bad capacitors and it fully works again and so far it is holding the time.
 
  #7  
Old 11-06-16, 12:27 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 51,376
Upvotes Received: 206
I'll be the problem was poor soldering and you located it around the cap area.

Good job!
 
Reply

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
Display Modes