To remove the DR7 (display) board remove the electrical connectors plugged in to the top side, the single screw, and unplug the coax and the wire that run to the High Pass Filter module. Hint: mark the hole that the coax feeds through with a marker, and leave the grommet on the wire with a knot tied in the wire so you don't lose it (don't ask how I know that). Then, starting from rear edge, work the DR7 up at an angle until all the connectors are free and pull it backwards until it clears the front panel. A classic PC slot cover is an ideal tool for this.
A more gentle but also more involved way to free the DR7 is to follow the procedure in the back of the service manual to gain access to the PTO. This will allow you to lift the DR7 straight up.
You can find instructions for a board puller for the circuit boards here:
This tool will fit into the small holes near the top edges of the boards.
Clean the connector male pins and sockets with your non-contaminating solvent of choice and follow up with a drop of DeOxit or equivalent (NOT spray). Installation is the reverse of removal. When re-installing the card cage cover shields all screws must be present, snug but NOT over-tightened.
Note that the coax connectors are a little odd. The center conductor of the coax is the "pin" and it slides into a tiny socket soldered to the board.
I am sure others will chime in with more tips.
73
-Jim
NU0C
On Thu, 08 Feb 2024 19:36:46 -0800
"Bill NZ0T" <nz0tham@...> wrote:
Could somebody please point me towards a prodcedure for removing and cleaning the circuit boards?? I assume I will need to removw the display board to get to all the boards so I need to know how to do that too.? I have spent about an hour looking around on the internet and haven't found what I need yet and there is nothing in the service manual.
73, Bill NZ0T
--
73
-Jim
NU0C
Jim Shorney