RH pod not working

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Re: RH pod not working

Postby Tuga2112 » Wed 05.12.2018, 14:13

mikecg wrote:Are you testing both the diodes and resistors on the board or isolating them by disconnecting one leg from the board?

i tested initially everything on the board.
if the reading was not the expected reading i lifted the legs to confirm.
in my board, only 1 diode needed to be lifted in order to test correctly.
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Re: RH pod not working

Postby Brit-Car-Nut » Wed 05.12.2018, 14:24

Tuga2112 wrote:
i do not advice removing the transistor, i would recommend disconnecting it. which can be done using sharp snippers

By this, do you mean in the end that you left the old transistor in place and laid the replacement over the top of it as in the picture? Or is that just the final test phase before removing the defective one and properly attaching the new one to the heat sink?

Those are power transistors and they get very hot while operating. They need to be properly attached to the heat sink area or they will self destruct fairly quickly.
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Re: RH pod not working

Postby Tuga2112 » Wed 05.12.2018, 20:20

Brit-Car-Nut wrote:By this, do you mean in the end that you left the old transistor in place and laid the replacement over the top of it as in the picture? Or is that just the final test phase before removing the defective one and properly attaching the new one to the heat sink?

Those are power transistors and they get very hot while operating. They need to be properly attached to the heat sink area or they will self destruct fairly quickly.


I left the old transistor where it stood, for 2 reasons.
the first being the fact the rivet that holds it in place is tricky to remove without risking damaging the PCB
the second reason is because the replacement transistor is rated higher current and voltage as well as lower heat dissipation and wider working temperature range

the transistor only powers up for a few seconds so, it should work fine for a long time given the ratings and workload.
I had it now fitted for 3 or more weeks with daily use (its night time here both on my way to work and back) without any problems.

I will report if it fails.

the biggest consern i have about the transistor is that its glued on top of the old one with pretty long connector legs. i fear it will fail due to trepidation of the car/engine breaking loose the soldering joints.
1991 elan se
1991 elan se project
91 MR2 Turbo (import) project
94 Celica GT4 (Import)
94 4Runner
98 Celica SR

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Re: RH pod not working

Postby mikecg » Fri 11.01.2019, 19:39

Hi Tuga, Happy New Year I finally got round to checking the components on the pc b and have one resistor which i have read as Brown Black Blue Gold (no 1 on my scruffy attachment) which should be 10m ohm but with one leg removed is reading 11.45 m ohm which is a bit out of tolerance but is it enough to worry?.

I also spotted that one of the wire additions to the board was now not attached to to transistor that has blown also on the diagram . I have now repaired this .

Can I either purchase one of your spare transistors or can you point me in the direction of the model and supplier where you got yours.

Thanks Mike
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Re: RH pod not working

Postby GeoffSmith » Fri 11.01.2019, 20:59

João, firstly well done for fixing it but you MUST drill out the old rivet and fit a nut and bolt with a washer on the bottom. It is only a double sided board so there is nothing you can damage if you drill it out carefully.

Originally, I was going to say:
As well as the potential thermal and vibration problems above, the tab is connected to the drain (centre) connection and is the main current path through the device (shown thick red & blue in the annotated picture below) - without this connection, the current is flowing through the narrower track highlighted red which may well burn out.

Image

but I've had a better look and there is a wire link from the relay to the centre pin so it doesn't look like there is a path through the tab.
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Re: RH pod not working

Postby GeoffSmith » Fri 11.01.2019, 21:09

Mike, although 11.45MΩ is outside the limits for a 10MΩ±5% resistor, I reckon it's near enough as it's only used in the timing circuit.
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Re: RH pod not working

Postby Tuga2112 » Fri 11.01.2019, 21:54

GeoffSmith wrote:Mike, although 11.45MΩ is outside the limits for a 10MΩ±5% resistor, I reckon it's near enough as it's only used in the timing circuit.

I Agree with Geoff's accessment of the resistor. (for whatever my ignorant opinion is worth)

on your previous comment Geoff.

GeoffSmith wrote:but you MUST drill out the old rivet and fit a nut and bolt with a washer on the bottom. It is only a double sided board so there is nothing you can damage if you drill it out carefully.

my consern with drilling is mainly the fear of cracking the board (which would cut the working connections).
at the moment, my intention is to folow the "if it aint broke, dont fix it" mantra. IF it fails, i will re-open the box and address the failure, for the moment, i will be touching wood and enjoy the ride. (tbh its a very minor fault, since the pods still work manually)

GeoffSmith wrote:but I've had a better look and there is a wire link from the relay to the centre pin so it doesn't look like there is a path through the tab.

that is correct. the tab where the rivet sits is an open circuit (i was surprised as well, as i was expecting it to be a ground )

mikecg wrote:Can I either purchase one of your spare transistors or can you point me in the direction of the model and supplier where you got yours.

i have 1 spare (i mean. i have 9, but 4 of them are already commitioned for a project that, if successfull, i will be bragging about by the end of the month :-D and other 4 will be used on a second copy of same circuit )
they are ST (brand) "p60nf06" model N CHannel transistors
i got mine of ebay. https://www.ebay.co.uk/itm/123558164761 ... 3558164761
posting will cost at least 58p. plus adding the envelope cost, your better off just ordering them from ebay as well.

they are pretty cheap when ordered in bulk (see this listing) as long as your willing to wait a month for them to arrive from china.

in fact, i am likely to order another set of 10 in the near future.
1991 elan se
1991 elan se project
91 MR2 Turbo (import) project
94 Celica GT4 (Import)
94 4Runner
98 Celica SR

too many projects. not enough sunny days :(
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Re: RH pod not working

Postby mikecg » Sat 12.01.2019, 20:11

Thanks guys I have ordered some . Oi will try the piggy back option initially to prove whether I have solved the fault and then look at the posts to see if I just continue with this option as has Tuga .
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Re: RH pod not working

Postby GeoffSmith » Sat 12.01.2019, 22:32

Drill the bottom of the rivet with a countersinking bit until you start drilling into the FR4, apply soldering iron and it will fall away top and bottom.
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