TCS M1 Decoder Installation for HO-Scale Hornby J52 0-6-0. It was performed by Bob Dunstone of Southland, New Zealand.
The Hornby J52 Chassis is held by the two coupling mounting screws and a clip at the rear of the bunker.
Remove the screws, press the clip in and down, continue the movement downwards until the front supports disengage.
With the chassis free proceed to remove the suppressors and the motor leads.
Shorten and heat shrink the white, blue and yellow decoder leads to prevent shorts.
The decoder can be positioned as shown or laid flat on the same section. I found the clearance between the leads and the rear of the smoke box door of the loco was minimal when laid flat and could prevent the chassis from sitting back in position.
Once in position dress the leads of the decoder and carefully solder into position.
This view shows the clips which hold the front of the chassis into the body. There is not a lot of room. It is important with this loco that the chassis fits correctly. I.e. no additional force required to refit the rear clip.
Important Soldering Tip
Please do not use any flux either liquid or paste on the mother board. Over time, the acidic properties of liquid or paste flux will begin eating away at the fiberglass PCB and will damage it. Use only Rosin-core solder or no-clean flux approved for electronics use.
TCS recommends the use of Kester "44" Sn63 Pb37, .015" diameter Rosin-core solder. Kester part number 24-6337-0007.
You can order this solder from the following retailers:
Digikey - PN:KE1110-ND
Techni-Tool - PN:488SO6775
Other solder tips
When stripping wire, only strip a tiny little bit of the insulation. Strip no more then a 1/64 of an inch. When the wire gets tinned with solder, the insulation will shrink back more. Try to not expose any more wire then half the length of the solder pad at most. In no case should solder or exposed wire wire ever be outside the boundary of the the solder pad you are attaching a wire to.
Click here for important information on properly Stripping and Tinning wire