Panasonic SAPM-31 Mini hifi, Tapedeck motor spinning all the time

[lcdcaps1]

Re: Panasonic SAPM-31 Mini hifi, Tapedeck motor spinning all the time

Hi
I can't find them
Can you recommend some other ones please
Thanks

Hi
I have sourced some
I will order them
hopefully they arrived soon

[lcdcaps1]

Re: Panasonic SAPM-31 Mini hifi, Tapedeck motor spinning all the time

Go to EBAY, then type DTA143X, There is a ad for 5pcs X DTA143X 340t-23 The picture shows DTA143XKA
All you need to do is measure the case on the original to know which part to order. They are electrically the same, just the foot print is slightly different.

Q1316 likely shorted do to high current in motor, maybe the mechanism jammed causing the motor to stall and draw excessive current

Hi
I can't find them
Can you recommend some other ones please
Thanks

[R_J]

Re: Panasonic SAPM-31 Mini hifi, Tapedeck motor spinning all the time

Go to EBAY, then type DTA143X, There is a ad for 5pcs X DTA143X 340t-23 The picture shows DTA143XKA
All you need to do is measure the case on the original to know which part to order. They are electrically the same, just the foot print is slightly different.

Q1316 likely shorted do to high current in motor, maybe the mechanism jammed causing the motor to stall and draw excessive current

[lcdcaps1]

Re: Panasonic SAPM-31 Mini hifi, Tapedeck motor spinning all the time

NO, that is a mosfet. Why do you think it is bad????

Thanks.
My thinking is that when q1316 shorted it would have taken out Q1314
Because the emitter and collector shorted on Q1316
If I replace Q1314 and doesn't work it would be handy to have on hand to replace it
Could you advise of some suitable compatinle replacements please that is available on ebay or aliexpress. Thanks
Thanks

[R_J]

Re: Panasonic SAPM-31 Mini hifi, Tapedeck motor spinning all the time

Would this be ok to use as an alternative if needed for q1314
https://cdn.badcaps-static.com/pdfs/...f4c949429a.pdf

Please let me know, all
Thanks

NO, that is a mosfet. Why do you think it is bad????

[lcdcaps1]

Re: Panasonic SAPM-31 Mini hifi, Tapedeck motor spinning all the time

Would this be ok to use as an alternative if needed for q1314
https://cdn.badcaps-static.com/pdfs/...f4c949429a.pdf

Please let me know, all
Thanks

[lcdcaps1]

Re: Panasonic SAPM-31 Mini hifi, Tapedeck motor spinning all the time

Digikey stocks both parts.

I know I only need one but if I order both at the same time I have them on hand just incase

[lcdcaps1]

Re: Panasonic SAPM-31 Mini hifi, Tapedeck motor spinning all the time

Thanks for the reply.
Are there any compatible or alternatives that I can buy from ebay or aliexpress
Digikey I will have buy apps for free shipping
Thanks so much in advance

[R_J]

Re: Panasonic SAPM-31 Mini hifi, Tapedeck motor spinning all the time

Digikey stocks both parts.

[lcdcaps1]

Re: Panasonic SAPM-31 Mini hifi, Tapedeck motor spinning all the time

If Q1316 is shorted e~c that would explain why the motor is on. I would replace it, Q1314 is likely ok.
The KA is larger, you need to measure the original to see which will fit the pads.

Thanks for the reply
I cant find anywhere that sells these
DTA143XKA or DTA143XUA
Can you post some alternatives or compatibles ones
Not sure if some values can be changed
Thanks so much

[R_J]

Re: Panasonic SAPM-31 Mini hifi, Tapedeck motor spinning all the time

If Q1316 is shorted e~c that would explain why the motor is on. I would replace it, Q1314 is likely ok.
The KA is larger, you need to measure the original to see which will fit the pads.

[lcdcaps1]

Re: Panasonic SAPM-31 Mini hifi, Tapedeck motor spinning all the time

From My research i have found the transistor for q1314
it is DTA143XKA or DTA143XUA, depending on package
i cant find these anywhere
which ones can i use as a replacement please
thanks

[lcdcaps1]

Re: Panasonic SAPM-31 Mini hifi, Tapedeck motor spinning all the time

Q310 base is controlled by the logic from the microprocessor. 0 volts on Q310 base means that Q310 is not turned on, so the collector will be high. If you want, short pin2 of cn309 to ground and see if the motor turns off.

These type of tape decks need the motor to be running so that when you press a function, the plunger engages the mechanism WHILE the MOTOR is running. If the motor is not running when you press play nothing will happen.

Tape decks that have levers that you push to engage the mechanism keep the motor off until the mechanism is engaged. This is not how this mechanism works.
The tape motor may turn off after 10min of non use. see if you don't play a tape and let it sit, maybe the microprocessor program will turn it off.

i shorted pin 2 to ground on cn309
the motor did not turn off

[lcdcaps1]

Re: Panasonic SAPM-31 Mini hifi, Tapedeck motor spinning all the time

No. then it is likely Q1316 shorted e~c or Q1314 is bad.

I have see other tape decks that use touch controls for there operation, and they keep the motor running, as that is what makes this type of mechanism work.
If the mechanism engaged before the motor started it would not have the power or momentum to engage the mechanism.

If the motor was not running, when you pressed PLAY there would need to be a delay for the motor to start and get up to speed before the plunger activated the mechanism to engage the tape heads/pinch rollers.

So i measured the emitter and collector on Q1316
i got 0.8 ohms

so how do i know if Q1316 is bad and so is Q1314
i can buy q1316 easily but q1314 is a pain as nothing is coming up

[lcdcaps1]

Re: Panasonic SAPM-31 Mini hifi, Tapedeck motor spinning all the time

They are sometimes refered to as digital transistors, they have internal base bias resistors, look at the number on the part itself.
Measure the internal resistors

Ok so after a lot of cleaning, I managed to get the writing on the transistor
for B1GDCFGH0002
The writing on the chip is
33 07

Can anyone tell me which transistor this is and what replacement will be fine
Thanks

[lcdcaps1]

Re: Panasonic SAPM-31 Mini hifi, Tapedeck motor spinning all the time

They are sometimes refered to as digital transistors, they have internal base bias resistors, look at the number on the part itself.
Measure the internal resistors

Thanks for the reply
I'll have a look but can't read the writing on the part
How would I know for sure if it is Q1316 or Q1314

[R_J]

Re: Panasonic SAPM-31 Mini hifi, Tapedeck motor spinning all the time

They are sometimes refered to as digital transistors, they have internal base bias resistors, look at the number on the part itself.
Measure the internal resistors

[lcdcaps1]

Re: Can't find anything B1GDCFGH0002

It's a transistor I'm guessing for a panasonic stereo

Thanks but need a replacement
Do you know what is an alternative please
Thanks

[Uranium-235]

Re: Can't find anything B1GDCFGH0002

It's a transistor I'm guessing for a panasonic stereo

[lcdcaps1]

Can't find anything B1GDCFGH0002

Hi
I can't find information on B1GDCFGH0002
What would be a suitable replacement please thanks