RC Tank Warfare community hobby forum

Hi All,

In the brown stuff again while converting WSN T34 to Taigen V1 MFU. While trying to resolve recoil & led flash, I grabbed a different 8 pin cable without checking the wire sequence, it was wrong and smoked the MFU. Luckily, (I think & hope), it appears that only the one resistor has blown after performing stand in duty as a fuse.
My problem is the failure makes the banding unreadable except for the1st Brown & tolerance Gold 5%. It’s the resistor that sits in front of the 8 pin connector and next to the red, red, gold?, gold.

Can anybody help please with either colour banding or value? I don’t want to fit one of my V3s while stumbling around in the dark

Thx, Andy

Hello, I wouldn't want to be an ominous bird, but if the resistance is in this state, I think there are other things toast ... is it just black? (which means overheating) or cut off? do you have a multimeter for the control?
there are no other traces under the PCB, on the copper tracks, or an exploded component?

Hi, thx for the reply.

The board tracking shows no burning, lifting or over heat. The fan runs, the tracks rotate, the turret rotates & the front light/mg function. The adjacent resistor has continuity. The blackened resistor is blown with no continuity, totally shot. I checked continuity of the components and board with a DVM in the area affected & it appears ok. However, you maybe correct & I’m just kidding myself!

I spent the evening looking for a pcb schematic & photo of the area showing the blown resistor, without success. Rather than just insert any lowish resistor, I’d like to use the correct one.

ATB,
Andy

Hello,
well I just looked, on one of my turntables, the value is identical to the one on the side

and unless I am mistaken, it is the limiting resistors, for the headlights and the machine gun, so wish luck be with you

Thank you for your support. The undamaged resistor works out to be a 2.2 Ohm +/- 5% tolerance. I’ve ordered five from eBay.

The blown resister is adjacent to the 8 pin connector, specifically the centre three pins connecting elevation neg, recoil neg & common positive. I believe the 8 pin multi cable I used shorted a negative pin to the common positive and the resistor was the immediate casualty.

Thanks again.

exact, I looked upside down at the diagram for the connecting cord? in principle, the colors of the cables are identical to the photo above

Yes, the mg/front light & rotation worked from the start. The problem I’ve had is getting the recoil & LED flash to play ball. I’ve swopped around the centre 3 pin in to the hull connector and get either:-a) constant elevation, b) constant recoil & LED on.

I think the problem lays with the connection of the recoil microswitch and flash LED. I’m using the WSN recoil unit with a duralumin barrel I turned up. (The WSN plastic effort was unserviceable after the previous owned introduced it to an un-moveable object!). I’ve read all the posts I can find on the subject and still am too thick to resolve this.

This is the wiring convention I initially followed together with switching round the 3 pin connection:- elevation (-), recoil (-) & common (+). Resulting in constant recoil & LED OR constant elevation.

I’ve sorted this sort of issue before on a Panzer IV, however that used a Taigen combined recoil ‘elevation unit.

Hello,
In view of your photos, for me there is a connection error? indeed it seems that there are common connections with CN2 and CN 3 if I follow your wiring correctly? CN 2 is only intended for Infra Red mushroom and CN 2 specific to flash, whether Led or Xenon here is how plugged into CN3, J / K being the swicht andGH power supply Led flash, hope you will solve your problem