|
|
|
#1
|
||||
|
||||
Inside the box: OM617 Tachometer Amplifier
Hi All,
Its been a while since I've post any of these photos series, figured I'd do one. A few weeks ago a customer of mine asked about repairing a tachometer amplifier for his 617. In the past I've shied away from these because they are somewhat of a pain to do. The whole unit is filled with a liberal amount of silicon. The only way to get to the solder side of the circuit board is to mechanically remove the silicon! I was able to remove much of the silicon and expose the capacitor leads. I found an enormous amount of cold solder joints, a number of them had big holes around them too. I replaced the capacitor and touched up what I could. I tested the unit in my 300SD (stationary) and sent it out to my customer. Unfortunately it only worked for a few miles. It turned out there were more cold solder joints lurking under the silicon that I didn't remove. I had him send it back and this time I cleared out everything and re-flowed everything. Nearly every join on the circuit board was bad! Anyway here are the photos! Not a huge amount but enough to give you an idea of whats going on! Filled in with home high quality hot glue to keep everything in place! Mercedes Diesel Tachometer Amplifier - Album on Imgur
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k |
Bookmarks |
|
|