Sherbourn 5/1500A Audio Dropout Fix - AVS Forum
Forum Jump: 
 
Thread Tools
post #1 of 3 Old 02-28-2013, 05:24 PM - Thread Starter
AVS Club Gold
 
bobpaule's Avatar
 
Join Date: Jul 2003
Location: US
Posts: 1,401
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 14 Post(s)
Liked: 25
Hi,

Thought i'd share my experience.

Symptom: random unpredictable audio flickering, then dropouts, then channel cuts off. A turn on the power button, or a restart cures it.

Cause: bad VS-24MB-NR relay, $2.65 at Mousser.

Joe at Sherbourn confirms that at about 10 years these relays fail, testimony to it, i now have 4 out of 5 channels on one of my 2 5/1500As doing it. He strongly advised replacing all relays.

Repair tools:

1. VS-24MB-NR relays.
2. Philips screwdriver, power for removal only.
3. Forceps, very useful for pulling connectors.
4. Pen and paper, you will need to draw a diagram
of the wiring you remove, the back of each board has
seven position connectors.
5. Solder gun, an air rework tool is a blessing, the X-Tronic
6040 station is a Godsent. Desolderging wick to pull extra
solder after old relays removed. Rosin core solder.


The relays are under the two large capacitors behind the
transformers.

Sequence (leave the front and transformers alone):

1. Lay amp on back feet, remove all bottom plate screws, the
modules are now only attached at back. You will have to remove
bottom right foot looking from bottom.
2. Lay it down, remove top plate.
3. Remove back screws holding XLR and RCAs.
4. Remove all connectors, make a map with positions. Not too many, really.
5. Pull gently transformer end of board upward then back until
you remove it completely, always slowing down to remove wires
you may have hooked up. There is room to wiggle as the boards
come lose.
6. Take rework air gun with 2.5mm blower, or soldering tip and heat
over the wick, the old relay will drop out.
7. Put new one in, clamp it to board, solder. Heat the pins, do not melt
solder on gun, nice perfect Hershey kiss droplet identical to factory ones
is a sign of a good contact. Don't worry, if a dumb PCP internist can do it,
you can do it:)

I am now sitting in front of my Signature S8 mismatched (v.1,2,3) system auditioning Warner Japan's release of the Eagles, Hotel California in 5.1 is xxxxing amazing, really. Gone are the dropouts, 3 days now.

My system:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
bobpaule is offline  
Sponsored Links
Advertisement
 
post #2 of 3 Old 12-26-2013, 04:37 PM
Senior Member
 
kbreese's Avatar
 
Join Date: Apr 2005
Location: Long island, NY
Posts: 425
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
Thanks very much for sharing this as I have this same amp and figure it should start happening soon. However it sounds a bit tricky, I wish there were some pictures to go with it. I don't even know what an air rework tool is. Once I fixed my Mitsubishi WS-65813 HDTV by replacing the capacitors so I still have a soldering gun from that. But this sounds much more complicated...

Panasonic 60VT60
Sherwood P-965
Parasound 2X205
Sherbourn 5X200
SVS-12
Polk LSi9's
 

kbreese is offline  
post #3 of 3 Old 08-07-2014, 12:56 PM - Thread Starter
AVS Club Gold
 
bobpaule's Avatar
 
Join Date: Jul 2003
Location: US
Posts: 1,401
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 14 Post(s)
Liked: 25
FYI amps running strong. Bryston 9BSST upgraditis resisted, I believe my next amp will be an additional balanced 2-channel behemoth, dedicated to the XLR stereo off the UD9004 via the CP700.

My system:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
bobpaule is offline  
Reply Receivers, Amps, and Processors

User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page


Forum Jump: 

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