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[BobF]

HELP please

Does any one out there use a Sanwa Gemini II radio controll system please.

I got one from Andy, but have a connection query.

(Andy you may know!)

The very vague instructions for the transmitter, state the plug system is 'Z type plug' and that using the old style battery plug will destroy the transmitter as the pos and neg wires are reversed.
The problem is that the receiver also has the Z type plug label on it, so would fitting a battery supply of the old style connector also burn out the receiver.
Also in last years Ripmax catalogue, the Sanwa servo page lists two versions of each servo, standard or Z type.

As I did not get any servo's with this set, I can't check back the wiring there either.

My Mtroniks esc says on the instructions that the plug is wired for Sanwa, and it does fit, but I don't want to blow up the receiver by using the suck it and see method.

Any comments will be appreciated.
Bob.

[Ian Robins]

Hi Bob,
You could take the case off of the reciever as normally,
all the pos pins are connected, and
all the neg pins are connected.
The signal pins are always un connected.
Also I think you are right the pos and neg are reversed but also I am not sure.
I remember taking a rx case off and pos and neg were labelled but it was a while ago.
Has you rx a black or blue case.
Good luck
Ro88o

[Ian Robins]

Hi bob,
Is the radio 40mhz.
is the battery socket 2 or 3 pin. Generally 2 pin always wired the same.
cause the google results show 40mhz, if so have you a rx battery pack and a servo spare as I think you would do no harm by plugging system together
but what do I know
Ro88o

[BobF]

Hi ro88o,

Thanks for your reply.

The set is 40 mhz
It has a blue case
The battery socket is three pin
The right hand pins are common to each other
The centre pins are common to each other
The battery socket says B/DSC (DSC)?
I have opened the case, and there are no helpfull markings.

The thing that strikes me most about this radio, is the almost complete lack of instructions.
Yes it does tell you what to do, but only if you understand what the abbreviation's stand for or what effect altering things will have. Fortunately we have a club meeting tomorrow so there will be someone there to explain the various codes to me (Fingers crossed)

eg  D/R   EPA  ARC  MODEL  SUB-T  REV  BATT. OK so I understand most of this, but on the box it says ideal upgrade from entry level gear. So one would assume a fairly new modeller would be buying this equipment.

Cheers Bob

[malcolmfrary]

If you look at the printed board for the RX, you can follow the connections around.  Somewhere near the power pins will be an electrolytic capacitor, and these are marked + and -.  A magnifying glass will be useful, and a good memory as you cant lok at both sides at the same time.  The power pin connected to the - will be the - of the supply.  Sanwa had their own ideas about pin allocation, so caution is always worthwhile.

[BobF]

Hi Malcolm,

Just given that a try, but can't find anything with + -  signs on.

Components the size of a grain of sugar with 204 and other numbers on but thats all.

There are two large round bits sticking up on the front of the board with a blob of red and green paint on, but cant follow where they go as they cover the board.

Thanks anyway.

Bob

[BobF]

OK chaps,

All sorted.

Did a bit of sideways thinking and came up with this answer.

Offer the transmitter plug up to the receiver. It will only fit one way as normal, which puts the neg to the right and the pos in the middle. Take deep breath and connect esc to the rx. and turn it all on. No smoke good sign, twiddle levers, still no smoke still good sign, rudder turns motor spins.

Now sitting here typing this, and realise what a lucky chap I have just been.
There is no BEC fitted to this receiver, so good job I didn't push the transmitter plug all the way in as it is 9 . 6 volt battery.

Thanks to you for your help
Bob

[malcolmfrary]

Modern technology!!
Glad you got sorted in spite of my offereing.
Looks like this is a post-individual device from Sanwa.

[BobF]

I'm now really baffled as to these new 'Z' plugs. Ive had a couple of Sanwa sets for around six or seven years, and the receiver and servo plugs  and wiring are the same as this new one. The only difference may be in the transmitter as I've never charged my batteries in situ. So it may be that the nicad pack in the transmitter is all that has changed. I just hate not knowing.

Thanks again
 Bob