Taigen V1 - Help needed identifying resistor value.

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Postby Bassetus44 » Thu Nov 25, 2021 9:38 am

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
Attachments
6611C4BF-D34A-4724-9ADC-DEF892E5E388.jpeg
Blown resistor #1

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Postby Jofaur86 » Thu Nov 25, 2021 1:02 pm

:( 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?

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Postby Bassetus44 » Thu Nov 25, 2021 2:03 pm

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! :O

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

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Postby Jofaur86 » Thu Nov 25, 2021 2:03 pm

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

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Postby Jofaur86 » Thu Nov 25, 2021 2:07 pm

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

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Postby Bassetus44 » Thu Nov 25, 2021 7:43 pm

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.
Last edited by Bassetus44 on Thu Nov 25, 2021 11:41 pm, edited 1 time in total.

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Postby Jofaur86 » Thu Nov 25, 2021 10:13 pm

:{ exact, I looked upside down at the diagram
34569930-F15C-492E-BF07-D3D076AEE71B.jpeg
34569930-F15C-492E-BF07-D3D076AEE71B.jpeg (40.79 KiB) Viewed 278 times

B4CB4BE4-C6E6-421B-BCA7-A6C3850C5C9D.jpeg
B4CB4BE4-C6E6-421B-BCA7-A6C3850C5C9D.jpeg (62.64 KiB) Viewed 278 times

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

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Postby Bassetus44 » Fri Nov 26, 2021 8:59 am

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.

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Postby Bassetus44 » Fri Nov 26, 2021 10:11 am

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.
Attachments
A3FD8A9A-4213-4D22-AAE1-CC54C1F709FC.jpeg
WSN to Taigen/Heng Long MFU.#1
A3FD8A9A-4213-4D22-AAE1-CC54C1F709FC.jpeg (85.52 KiB) Viewed 257 times
70F6C354-8147-4FB0-BD88-AE34A42BF91B.jpeg
WSN to Taigen/Heng Long MFU.#2
70F6C354-8147-4FB0-BD88-AE34A42BF91B.jpeg (89.15 KiB) Viewed 257 times

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Postby Jofaur86 » Fri Nov 26, 2021 11:14 am

:D 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
1195FE51-6FAA-4522-9C55-5F9D7A08C481.jpeg (79.38 KiB) Viewed 252 times


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

E820478F-0B06-4332-9769-62CBBA0D5170.jpeg

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Postby Bassetus44 » Sat Nov 27, 2021 4:23 pm

Thank you. I’ll try this out

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Postby Jofaur86 » Sat Nov 27, 2021 6:56 pm

OK, Good evening,
if I read it again, I think I have inverted in the definition, :{ J / K switch and G / H the flash led

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Postby Bassetus44 » Tue Nov 30, 2021 5:29 pm

Good afternoon.

I’ve received and fitted the 2.2 Ohm resister and the MFU appears to be working OK :thumbup:

I wired the 2 microswitch wires and the 2 LED wires as per your schematics and depending on the hull centre 3 connection positions, I get controllable recoil and flash but without self parking in the fully forward return position. This is a much better result, thank you.

Nibbling away at the issues and returning to the hull connector centre 3 pins, I see one of the following depending on the sequence they are connected:-
A) Constant recoil, (even on standby)
B) Constant Elevation motor, (again even on standby), or
C) Incorrect Recoil motor rotation, (with the required direction being anti-clockwise so as not to jam the cam). (Elevation motor direction obviously doesn’t matter).

There has to be a constant negative to one of the three pins making a circuit to a motor on standby?

I’ve sketched out all possible permutations of the 3 wires connecting to the centre 3 pins, [elevation (-) negative, recoil (-) negative & elevation/recoil (+) positive], and I’m working through them.

My logic was that the common positive (+) should connect to the to the positive one of the three pins, but this doesn’t workout.

ATB

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Postby Bassetus44 » Tue Nov 30, 2021 6:05 pm

Update:

With the tank turned on but on standby, I’ve just put a multimeter on the centre three pins of the 8 pin hull block with the following result;

* The common Positive (+) pin is the pin next to the M/G, front light three (3) pin plug (the BROWN wire on the 8 pin connector cable).
* The Negative (-) makes a circuit with the positive delivering circa 7.5 volts. ( the YELLOW wire on the 8 pin connector cable).
* The final pin (next to the turret rotation two (2) pin plug), does not complete a circuit in standby mode. (The BLUE wire on the 8 pin connector cable).

This is the same result I had before the resistor blew, so unless the Taigen MFU V1 was faulty before it was installed, i can’t understand what is occurring. It’s worth noting that the MFU was/is new and has not been run before.

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Postby Jofaur86 » Tue Nov 30, 2021 8:33 pm

great if it works :D joint photo with colors and voltage on the different pads. Indeed the common is 7.2 volts and Brown. For recoil it is normal on a BB shooting system, there is a solution to remedy it , but the best is to replace by an Asiatam mechanism
FE41949E-CFA8-4CA1-ADE4-045E9D9D0200.jpeg

A52123A0-93ED-464F-8FEC-F17EA0A11039.jpeg

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Postby Jofaur86 » Tue Nov 30, 2021 11:08 pm


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Postby Bassetus44 » Wed Dec 01, 2021 11:53 am

Thank you for your continued efforts to educate a mechanical engineer :haha: I have difficulty reading some of the notes, but I follow the colours fine.

I have used an Asiatam/Taigen recoil/elevation unit previously in a PzKpfw IV last year. However the WSM is different, being similar to an airsoft unit. It only has 2 motor wires & the 2 wires from the 3 pole microswitch.

Mechanically the recoil is simple, with the motor driving the gearbox to rotate a cam that pushes a pin inserted through the barrel back end, surrounded by a coil spring. The cam rotates, the barrel is forced back by the spring, the cam continues to rotate pushing the barrel forward to compress the spring and close the microswitch. It is much simpler than the one shown in rcuniverse.com.
Attachments
B6EDE957-FA2A-4E5F-8C7F-0BA4E02EC3E8.jpeg
Right hand side - microswitch #1
B6EDE957-FA2A-4E5F-8C7F-0BA4E02EC3E8.jpeg (89.22 KiB) Viewed 98 times
A68CB2A1-19F0-444A-844A-316D352147D5.jpeg
Left Hand side - motor #2
A68CB2A1-19F0-444A-844A-316D352147D5.jpeg (73.43 KiB) Viewed 98 times
71F11A5F-BD5A-4204-9ABC-0C0E489AE21A.jpeg
Overhead view
71F11A5F-BD5A-4204-9ABC-0C0E489AE21A.jpeg (87.13 KiB) Viewed 98 times
C8E83D83-FCF6-454F-8CB2-381451536F2B.jpeg
Left Hand - motor #1
C8E83D83-FCF6-454F-8CB2-381451536F2B.jpeg (83.53 KiB) Viewed 98 times

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Postby Jofaur86 » Wed Dec 01, 2021 2:37 pm

Can you explain your concern with the cannon to me again? please, because maybe not everything understands ?? and confused with other concerns !!! I have a friend who has transformed this type of system with the addition of a micro switch? on the mechanics of the cannon .... Go ask him what he did? see if corresponds to your concerns

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Postby Jofaur86 » Wed Dec 01, 2021 2:48 pm

Merci pour vos efforts continus pour éduquer un ingénieur en mécanique. :haha: J'ai du mal à lire certaines des notes, mais je suis bien les couleurs.
:O oh my, just try to help according to my modest knowledge, for the electrical part I'm not worried, for the mechanics? much less, and more I who would need lessons !!! for understanding? I'm sorry, because I use Google translation, my English lessons far, very far behind me :(

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Postby Bassetus44 » Wed Dec 01, 2021 3:19 pm

My French is poor, just school boy from 11 years old. 50+ years ago. My mother spoke fluent French and despaired of me. Your understanding is très Bon

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