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Hallo, the culprit was the transistor leaking. The transistor analyzer gave me it working but with a very low Hfe (~18).
Anyway I replaced caps (they still OK) and cleaned the pcb with a fiberglass brush.
Hopefully, you replaced all the small (size) electrolytic capacitors, as they will all eventually fail!
I have question for your question #1. Are you saying that when pin#10 of the MC14538 goes to ground when the retract limit is made , pin 10 is at 3.6vdc?
Pin # 13 of the MC14538 is pulled high (7.5vdc) thru the resistor network just to the right of the LA6324
Here's a timing diagram on retract of various pins on the MC (14538) and the LA (6324).
Also the charging of MC oin 13 on retract.
Dear mojorizing, my answer to your first question is no; the issue I notice is that the pin 10 does not go at 3.6v when the speed decrease and the spoiler should start the "auto retract" phase. The logic to me seems to be that when motor is running, 3.6V are applied to the related end_run pin and used to feel when the switch is shorted.
When motors is not running pin 10 and 9 are 0V, they become input for the +3.6 is supplied by the internal manual override switch fed by pin 11.
Very intersting the timing diagram of signals, thank you for sharing.
Herbie
This thread over-complicates the operation of the spoiler ECU!
As an example of simplicity, pins 9 & 10 are used for manual up/down ops via pin 11, and are used to stop (ground 9/10) the auto up/down travel,
during vehicle movement based on the pin 12 speed signal.
Speaking of complicity, Eric Franz has a good Youtube channel called "Eric Franz" It's all about his 964. His latest project is putting an ESP32 in series with the speed signal and before with the spoiler module to change the retract/extend speeds
I did the resistor mod also. Spoiler now goes up at 64 MPH but for some strange reason it stopped going down automatically. I have to manually lower it. I assume that some other component on the board failed while we were swapping the resistor.
I have a question.about the analogic version of the controller.
After analyzing the schematica, and verifyng with a real unit, I assume that when the "auto down" part is working the spoiler retracts until the down switch is grounded. If the down switch fails the 2nd monostable turns the motor off after the time defined by 47uF condenser (about 20 seconds).
BUT the other travel: when spoiler goes extending, if it does not hit the upswitch after sometime the warning light goes on, but the motor kept always on, am I right? This could ruin the motor, the only protection against burning should be the varistor, isn't it?
Or is there a function that when warning light goes on disenergize the motor?
Thank you
Yes, there is a thermal fuse to protect the motor
regards
Hans
There's a specific timer which limits the up-motor power. If the module is repaired properly, that's one of the final operational tests!
The thermal fuse (thermistor) is the LAST protection.
There's a specific timer which limits the up-motor power. If the module is repaired properly, that's one of the final operational tests!
The thermal fuse (thermistor) is the LAST protection.
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