Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help




Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Car Audio and Multimedia

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 09-30-2008, 08:48 PM
pjc pjc is offline
Registered User
 
Join Date: May 2006
Location: Arlington VA
Posts: 275
Hirschmann 6000U power antenna - test/troubleshoot circuit board?

The power antenna in my 1982 300SD is not working, either with the radio on/off button or the dash-mounted up/down switch. I've ruled out the dash switch (harness has power; switch tests fine with an ohmeter). I haven't tested the radio further, but I don't think that's the problem.

At the antenna's 6-pin connector, #3 is ground and #4 is blank (plastic pin). With the radio off and the dash switch in the center position, there is 12V power across #s 1-2 and 1-3.

I removed the unit from the car and opened the cover. With power applied to pin #5, the relay clicks, then clicks back when power is removed. But the motor doesn't operate. On the other hand, if I disconnect the motor leads from the circuit board and apply power directly to them, the motor works fine in both directions and extends and retracts the mast. So the problem is clearly not the motor or mast. Also, the little ratchet gear that opens and closes the three contacts is fine, as are the contacts.

From reading other threads on this topic, I understand the circuit board in these units can fail. Is there a way to troubleshoot the board to pinpoint the problem, and possibly repair it? I'd rather not pay Walter Odemer $110 for a new (or rebuilt) circuit board. BTW, the Hirschmann part number on my board is 720 393.

Any other suggestions would be appreciated.
Reply With Quote
  #2  
Old 09-30-2008, 11:35 PM
Registered User
 
Join Date: May 2006
Location: W. WI
Posts: 307
If you still are in need in three weeks, email me. I might have a board in working order.
Reply With Quote
  #3  
Old 10-09-2008, 10:13 PM
pjc pjc is offline
Registered User
 
Join Date: May 2006
Location: Arlington VA
Posts: 275
Update: Turns out the circuit board is okay. Problem was the mast jamming part way in or out. Replaced the mast and now all is fine.
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

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 On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 08:23 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page