Projector Screen Motor controller..

[djevlen]

Hello

this is a step-motor controller for a projector screen...to control it I use remote controll..i think it runs on 433 MHZ .

The problem is that the range of the remote control has been reduced from several metres to like 10 cm. I have to hold the remote control literally next to this board in order to issue commands up/down/stop.

Ive ordered new remote and successfully paired it. The problem is the same.

I have basic tools for electronic repairs...but don't know how to diagnose faults... There is no visible damage on the board.

Any help is appreciated.

 

[djevlen]

hi
It seems to be the little trans-receiver.....i heated it up a bit, and it worked.
However i cant find it in internet that exact same chip :
MAX3485
ESA
+413

Any idea how to get one of those or something equivalent ?
Its the +413 part that is no where to be found...

 

[rjenkinsgb]

The 413 is likely the manufacturing date, week 13 of year 4 in the decade.
Most ICs have either a four digit or three digit date code, like the "426" on the ST chip near that.

Any MAX3485 in the correct surface mount package should work fine.

 

[Les Jones]

Here is a link to it on Farnell's website.

Les.

 

[picbits]

Try taking it to a friends house away from where you live. There may be a 433Mhz signal interfering somewhere in your area. We have dead zones in a nearby town where car remotes won't work.

 

[djevlen]

Hi
Already ordered the max3485 like les jones suggested...lets see what happens

 

[djevlen]

I got another remote control which is able to pair with 5 different receivers (model bf-305) which I would prefer to use. On that remote it says 433.32Mhz... On the back of the remote that came with the projector screen it says 868Mhz .

Is there an easy way to rebuid the receiver / step motor controller so that its compatible with the bf-305 remote wich operate on 433.92MHz ?

 

[Nigel Goodwin]

I got another remote control which is able to pair with 5 different receivers (model bf-305) which I would prefer to use. On that remote it says 433.32Mhz... On the back of the remote that came with the projector screen it says 868Mhz .

Is there an easy way to rebuid the receiver / step motor controller so that its compatible with the bf-305 remote wich operate on 433.92MHz ?

No, replace either one of them.