Here is an ERR upgrade to a Lionel PA-1 from 1997. I was amazed when I saw the motors used on this. 2 Large Mabuchi 545 motors direct mount to the truck. No motor mount. This must have been a transition engine. It uses the old LCRU 2 but modified with no motor driver section, with a DCDR at the back to drive the motors. This also just had Signal Sounds.
So, I added the remote coupler to the front. Standard MTH PS-1 one can work. I than used a CCM to replace the DCDR. So now we had Cruise and remote coupler. Worked fine. Next was adding Rail Sounds.
Turns out the B unit sounds for this is a RS 3.0 with specific sounds. First thing I noticed is that this is not like the RS 4.0 board. Similar, but this uses 2 386 audio amps just like the RS2.5 platform. This also used the early heavily heat sunk power supply. I tried this RS board on the powered Sound Mother Board and it did not work. So I tried a RS 4.0 board in the unit and it worked. At that point I realized the RS 3.0 is not compatible with the Powered Mother board.
Having previously moved lesser chips RS 2.0 into Higher RS boards and have them work, I moved the chips to the RS 4.0 PCB. Worked, now had full RailSounds and cruise. Time to test under TMCC.
No Joy. Sounds started in conventional, lost cruise function. So I added the booster circuit and tried to use it to boost both the RS board and the CCM. Still no joy. So I unplugged cruise and got the RS to work in TMCC mod. So I think the LCRU just can not drive all this. Granted I used a low gain transistor to boost the signal. Could have tried two, but thought that was too complicate.
So shifted to the proven ERR Cruise CDR with the RS chip in the RS 4.0 PCB and all worked fine.
This engine should be a monster puller with these two motors. Super coasting with the flywheels too. Pictures show the LCRU (which is modified to provide phasing to the DCDR) and the Cruise M. Cruise CDR was an easy fit right in place of the LCRU. G