Taigen V1 - Help needed identifying resistor value.

[Bassetus44]

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

[Jofaur86]

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?

[Bassetus44]

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

[Jofaur86]

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

[Jofaur86]

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

[Bassetus44]

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.

[Jofaur86]

exact, I looked upside down at the diagram

34569930-F15C-492E-BF07-D3D076AEE71B.jpeg (40.79 KiB) Viewed 3363 times

B4CB4BE4-C6E6-421B-BCA7-A6C3850C5C9D.jpeg (62.64 KiB) Viewed 3363 times

for the connecting cord? in principle, the colors of the cables are identical to the photo above

[Bassetus44]

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.

[Bassetus44]

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.

[Jofaur86]

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

1195FE51-6FAA-4522-9C55-5F9D7A08C481.jpeg (79.38 KiB) Viewed 3337 times

here is how plugged into CN3, J / K being the swicht andGH power supply Led flash, hope you will solve your problem