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| TC1 lcr-meter transistor-tester fix |
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| acerquax:
.....in the meantime...... I built up your transistor replacement U4. What happens The tester starts with the introduction menue <<<Component Tester>>> <<<LCR-TC1 v1.43m>>> then it is displayed for a short time Testing.... Bat 3.9V VCC 4.98V then >>>switching off What is the functionality of this two transistors? :palm: When I push the button enable goes high (Pin3) ; PD1 (Pin7) goes low; PD2(Pin8) always High as long as I see the introduction menue Thats it... :horse: |
| madires:
What have you set for BAT_LOW? PD1 is the test button input (low active) and PD2 is the power control output (high active). U4's pin 3 (enable) is connected to the boost converter's 'enable' input. When you push the test button Q1 turns on the boost converter via the 'enable' signal. The ATmega is powered and starts running the firmware. One of the first things the firmware does is setting PD2 high. This keeps the 'enable' signal for the boost converter high, regardless of the test button. At the same time PD2 is also used as power source for the button input PD1, generating a high signal when the button isn't pressed. When the button is pressed Q1 turns on and switches Q2 to generate a low signal for PD1. |
| acerquax:
Thx mate... BAT_LOW? :-// no idea what this means, maybe the problem?!! What I measured, no more high at PD2 after the intro, that means for me no more power state locking and therefore no power for the MCU at all. |
| indman:
--- Quote from: madires on October 17, 2023, 05:24:19 pm ---What have you set for BAT_LOW? --- End quote --- Madires, acerquax uses my modified version of m-firmware 1.43ModEn, which is posted on my yandex disk resource. BAT_LOW is set to a threshold of 3300 and that is not the reason for the shutdown. Firmware 1.43Mod is tested by me personally on a similar TC1 clone and also by a very large number of other people and has shown itself to be very reliable and stable. To acerquax: 1.Check again very carefully how well you soldered the new ATMega644 processor and cleaned the flux afterwards! This is the main reason that causes difficulties and problems for the owners of the device. 2.Show me the state of the fuses, which is read by your programmer from ATMega644? To All! The forum has 1 global thread "$20 LCR ESR Transistor checker project" which has many different experienced people participating and reviewing, including our esteemed author madires. So I don't see much point in creating several duplicate new threads with questions like "my TC1 or T7 tester doesn't work, what should I do?". Ask your questions about this project in the global thread and you will be answered quickly. And to look through a dozen new branches with the same questions I personally do not have any desire. |
| acerquax:
Thx indman... :-+ No problem to swing over to the threat you suggested. I didn't managed the fuses at all! I can't find your suggested firmware... :'( [ Attachment Invalid Or Does Not Exist ] :palm: |
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