Laney IRT15H - UK Vintage Radio Repair and Restoration Discussion Forum

joebog1 · 29th Nov 2019, 1:25 am

I am working on a Laney guitar amp. I just wish to post some pics regarding removal of the circuit board.

The two pictures are pretty self explanatory, so to explain why I have posted this is as follows:

The pilot lamps ( two of them ) are soldered into the BOTTOM of the PCB. The (led) lamp itself is hot glued to the chassis. Which is removed first?

The 16 way header is GLUED into the socket!!! at BOTH ends. I guess it makes for a "solid" (sic) connection, but how is it removed??

I have seen some dodgy bodgy "fixes" before but I had to share this one.
Note also the large amount of SMD components!!

Joe

sortedradio · 30th Nov 2019, 10:26 am

Hi Joe,
It looks like hot melt glue. If so, I find brushing the bond with isopropyl alcohol works. It doesn't totally dissolve the glue, but softens it, allowing you to peel it off. It usually takes a couple of applications.

G6Tanuki · 30th Nov 2019, 10:40 am

To my eyes that looks like some quite-sensible and cheap "roadie-proofing"!

Not exactly tour-grade, but good-enough. Amps and cabs have a hard life on the road (beer-cooled amplifiers were a regular thing).

30th Nov 2019, 5:22 pm

Hot melt glue cooled down tends to snap off, pop it in the freezer (if it fits) or outdoors overnight.

McMurdo · 30th Nov 2019, 6:28 pm

I soften hot melt glue with a heat gun on a low setting, allowing stuff to just pull out.

29th Nov 2019, 1:25 am	#1
joebog1 Banned Join Date: Jun 2015 Location: Mareeba, North Queensland, Australia Posts: 2,704	Laney IRT15H I am working on a Laney guitar amp. I just wish to post some pics regarding removal of the circuit board. The two pictures are pretty self explanatory, so to explain why I have posted this is as follows: The pilot lamps ( two of them ) are soldered into the BOTTOM of the PCB. The (led) lamp itself is hot glued to the chassis. Which is removed first? The 16 way header is GLUED into the socket!!! at BOTH ends. I guess it makes for a "solid" (sic) connection, but how is it removed?? I have seen some dodgy bodgy "fixes" before but I had to share this one. Note also the large amount of SMD components!! Joe Attached Thumbnails

30th Nov 2019, 10:26 am	#2
sortedradio Heptode Join Date: Jan 2008 Location: Sheffield, South Yorkshire, UK. Posts: 656	Re: Laney IRT15H Hi Joe, It looks like hot melt glue. If so, I find brushing the bond with isopropyl alcohol works. It doesn't totally dissolve the glue, but softens it, allowing you to peel it off. It usually takes a couple of applications. __________________ Martin BVWS member GQRP Club

30th Nov 2019, 10:40 am	#3
G6Tanuki Dekatron Join Date: Apr 2012 Location: Wiltshire, UK. Posts: 14,005	Re: Laney IRT15H To my eyes that looks like some quite-sensible and cheap "roadie-proofing"! Not exactly tour-grade, but good-enough. Amps and cabs have a hard life on the road (beer-cooled amplifiers were a regular thing).

30th Nov 2019, 5:22 pm	#4
Guest Guest Posts: n/a	Re: Laney IRT15H Hot melt glue cooled down tends to snap off, pop it in the freezer (if it fits) or outdoors overnight.

30th Nov 2019, 6:28 pm	#5
McMurdo Dekatron Join Date: Jun 2009 Location: Staffordshire Moorlands, UK. Posts: 5,273	Re: Laney IRT15H I soften hot melt glue with a heat gun on a low setting, allowing stuff to just pull out. __________________ Kevin