Page 2 of 2 FirstFirst 12
Results 36 to 38 of 38

Thread: Peavey XR 696F - I made a booboo

  1. #36
    Member
    Join Date
    Nov 2018
    Location
    United Kingdom
    Posts
    166
    Thumbs Up/Down
    Received: 44/0
    Given: 154/0
    Rep Power
    2
    Quote Originally Posted by g1 View Post
    This is very strange. Resistors almost never short. Is it's body marked as a 100K resistor?
    It was an SMD marked 104, I double checked with a magnifying glass in case my eyes were lying to me!

    1 Not allowed! Not allowed!

  2. #37
    Lifetime Member Enzo's Avatar
    Join Date
    May 2006
    Location
    Lansing, Michigan, USA
    Posts
    32,010
    Thumbs Up/Down
    Received: 1,810/7
    Given: 0/0
    Rep Power
    55
    R110/116 are not there as a voltage divider per se, they are bleeder/balance resistors for the stacked filter caps, C110/115. The resistors make sure the voltage is equally shared between the two caps.

    At Q103 you show the 86v rail turning into 48v at the collector, and then at the base it is both 48 and 86v. Obviously this is in error. The collector should have the full 86v as they are wired together. 48v on the base seems right, as it is set by the two 24v zeners in series. 34v output is very low.

    In my 65 years of soldering, I do not recall a shorted resistor. I guess it makes more sense in an SM part.

    2 Not allowed! Not allowed!
    Education is what you're left with after you have forgotten what you have learned.

  3. #38
    Member
    Join Date
    Nov 2018
    Location
    United Kingdom
    Posts
    166
    Thumbs Up/Down
    Received: 44/0
    Given: 154/0
    Rep Power
    2
    Quote Originally Posted by Enzo View Post
    R110/116 are not there as a voltage divider per se, they are bleeder/balance resistors for the stacked filter caps, C110/115. The resistors make sure the voltage is equally shared between the two caps.

    At Q103 you show the 86v rail turning into 48v at the collector, and then at the base it is both 48 and 86v. Obviously this is in error. The collector should have the full 86v as they are wired together. 48v on the base seems right, as it is set by the two 24v zeners in series. 34v output is very low.

    In my 65 years of soldering, I do not recall a shorted resistor. I guess it makes more sense in an SM part.
    Once I've had a decent nights sleep I'll go over all the measurements again. I'll take Q103 out so I can get a good look at the tracks running under it to see where they go as its possible I've crossed paths trying to follow them, maybe I should take measurements with Q103 removed. Looking over my notes I don't seem to have "ticked" Q103 as replaced, seven others have a tick but not that one, so best I take it and be sure!

    0 Not allowed! Not allowed!

Thread Information

Users Browsing this Thread

There are currently 4 users browsing this thread. (0 members and 4 guests)

Similar Threads

  1. Replies: 36
    Last Post: 12-22-2016, 10:13 PM
  2. Peavey XR-696F Powered Mixer - Strange Noises
    By misterc57 in forum Other Amps
    Replies: 7
    Last Post: 12-11-2014, 02:39 AM
  3. Peavey XR-696F (XR696F) Powered Mixer
    By misterc57 in forum Schematic Requests
    Replies: 3
    Last Post: 11-15-2014, 02:38 PM
  4. diode rectifier in a 5f2-a princeton - did I booboo?
    By mort in forum Debugging Your Build
    Replies: 10
    Last Post: 07-22-2014, 05:48 AM
  5. Peavey Delta Blues - No Sound - All Tubes Glow - Powered "On", Made a "Hum", and died
    By Renegade44 in forum Maintenance, Troubleshooting & Repair
    Replies: 15
    Last Post: 12-15-2009, 06:24 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •