Author Topic: TC1 lcr-meter transistor-tester fix (Read 198691 times)

amunro · « **Reply #25 on:** October 10, 2019, 06:59:25 am »

Posting an update. So I received some atmegas from China which look like fakes. One of them does not have a circle near pin 1 which is really suspect. Anyhow, ordered one locally from RS Components in the UK, which was pretty reasonable and had free shipping (if I had known that I would have ordered from them). This flashes fine using a USBASP (with the latest firmware); you need to use -B 5 for the slower rate comms with avrdude. I will try the Chinese atmegas with a crystal at some point just to confirm they are fake; if they do work they are not new from Atmel/Microchip! As I was testing the fake atmegas, I used a break out board and just soldered pins 1 thru to 6 to allow the ISP flashing. A nice diagram here https://www.kanda.com/avr-isp-circuits.html of what is required (need a 100nF capacitor and a 10k resistor on the board). Once I flashed the Rs Components atmega I then undersoldered it from the breakout board and onto TC1. Low and behold we have a working TC1.

So to summarize, SV05 had a short pulling the 5V line down; replaced that. Still had a short, but not as bad. I then had the issue as shown in the photo by Bighouse, although my issue was with pins 1 and 2. Lifted pin 27 (AVCC) of the atmega off the board and short gone. Replaced both of these components. Thus I would say if you have the issue as shown with Bighouse you might need a new atmega. Used indman's LCR-TC1 original firmware on yadi.sk (date 9/16/2019).

Hope my hard earned effort helps someone! Was pulling my hair out with the fake atmegas!

Attached a photo of the breakout board patched into a 6 to 10 pin ISP adapter. 10k resistor on the top and 100nF capacitor is a smd soldered on the bottom of the board.

capitainekurck · « **Reply #26 on:** November 13, 2019, 03:36:56 pm »

Hello all

I new on this forum.
I bought one of there tester on ebay.
I receive it today it work 5 or 10 minutes and it fail. i was trying to check some resistor and led to test it (not capacitors) and suddenly it stop to work. it don't turn on any more. The battery is full load. when i push the button to power it on, the screen become white ( it normally black when it power off) and it turn black few seconds after.

Is it the same problem as yours or for you the display stay black ?

regards
L.S.

quinhomvs · « **Reply #27 on:** December 01, 2019, 02:50:52 pm »

Hi , I am from Brazil , my TC1 multtest , reads the components , but when there is no component connected shows the measurement as in the attached figure, someone already had a similar error .

Translate.

madires · « **Reply #28 on:** December 01, 2019, 03:35:45 pm »

That means there's a small current flowing between the probe pins, possibly caused by the SRV05-4.

Del · « **Reply #29 on:** December 27, 2019, 03:58:27 pm »

Hello. I'm sorry, I'm using a translator . Can you share the compiled hex and EEP firmware ? I wanted to update the firmware but broke the tester . Compiled the firmware from MARKUS, the device is working, but there are no functions IR and ZENER diode , . Thank you in advance !

madires · « **Reply #30 on:** December 27, 2019, 05:28:15 pm »

If you like to run the m-firmware please use the settings for the TC-1 listed in the Clones file.

Del · « **Reply #31 on:** December 27, 2019, 05:37:03 pm »

I can't do it . Errors . 324pa processor

madires · « **Reply #32 on:** December 27, 2019, 05:48:30 pm »

Have you set the correct MCU model in the Makefile?

Del · « **Reply #33 on:** December 27, 2019, 06:10:26 pm »

Yes, of course, I was able to collect a simple firmware . The problem is to create config.h . Might not have version 1.34 , but I have tried all 1.34-1.38 . Sorry, but for me it is not quite clear, I do not really understand English , and I work with hardware and not the software part.

Del · « **Reply #34 on:** December 27, 2019, 06:16:59 pm »

Could you at least share the config.h and Makefile and specify version 1.3 x Markus ?

madires · « **Reply #35 on:** December 27, 2019, 06:19:12 pm »

There's a Russian forum: https://vrtp.ru/index.php?showtopic=16451.

Del · « **Reply #36 on:** December 28, 2019, 03:57:51 pm »

What and in what file should be corrected to freeze occur only once, after pressing the button ? And then the tester should be turned off . And at me the screen is displaced on nekkolko pixels up and to the left, that is it is necessary to shift it down and to the right - as it to consult.

madires · « **Reply #37 on:** December 28, 2019, 04:12:14 pm »

You can use LCD_OFFSET_X and LCD_OFFSET_Y to adjust the display's offset. What do you mean by "freeze"?

Del · « **Reply #38 on:** December 28, 2019, 04:32:16 pm »

Quote from: madires on December 28, 2019, 04:12:14 pm

You can use LCD_OFFSET_X and LCD_OFFSET_Y to adjust the display's offset. What do you mean by "freeze"?

Sorry, I'm using a translator

. freezing is wrong , I meant a single measurement . insert the component into the pad, press the button, see the readings and after 10-20 seconds the device will turn off itself .

LCD_OFFSET_X and LCD_OFFSET_Y to adjust the display's offset - this in what file to edit ? $:-\$

madires · « **Reply #39 on:** December 28, 2019, 10:02:38 pm »

LCD_OFFSET_X and LCD_OFFSET_Y are set in the display section in config_644.h (ATmega 324/644/1284). For a single measurement you would have to modify main() since there's no setting for that.

Del · « **Reply #40 on:** December 30, 2019, 06:45:03 am »

Quote from: madires on December 28, 2019, 10:02:38 pm

config_644.h

SUPER ! everything worked out ! thanks

Quote from: madires on December 28, 2019, 10:02:38 pm

modify main()

This setting is in flash tc1_u4_v0.3.1.hex ?

madires · « **Reply #41 on:** December 30, 2019, 10:28:35 am »

I've meant main() in m-firmware's main.c.

Del · « **Reply #42 on:** December 30, 2019, 12:15:25 pm »

in main.c. -- if (MissedParts >= CYCLE_MAX)

which in config.h

#define CYCLE_DELAY 10000

#define CYCLE_MAX 0

Super ! now the device turns off after 10 seconds, after the 1st measurement

Dronhom · « **Reply #43 on:** January 27, 2020, 06:23:26 am »

Had a previously mentioned problem when the tester always shows around 5 V ghost voltage between 1-2 or 1-3, and the problem couldn't be solved by re-calibration etc. Based on advice here, I took off zener diodes DZ1 and DZ2 - and the problem disappeared! After that I checked DZ1 and found it in good working condition, but DZ2 was short. Thanks to all contributors to this topic for useful information.

klausES · « **Reply #44 on:** March 01, 2020, 01:24:02 pm »

Is it possible to deactivate the automatic switch-off P1-P2 for 15, 20, 25 seconds (25 seconds default) with this tester ?

I would prefer to switch it off manually with the button.
Or at least shutdown on e.g. 60 seconds ?

madires · « **Reply #45 on:** March 01, 2020, 02:42:33 pm »

Yes, by reprogramming U4 and switching to k or m-firmware.

klausES · « **Reply #46 on:** March 01, 2020, 02:50:33 pm »

OK thank you.

To do this, I would first have to deal intensively with this topic. $:-\$
Let's see how much time I can and must invest.

Von Wuellmann · « **Reply #47 on:** March 04, 2020, 08:00:29 pm »

Hi!

I also have a Longruner brand TC1 that has the same problem, this only measures a cell voltage, this 5.04v case Whatever I put in the the thing. Nor can I have it enter calibration mode.

Looking at this same post about the answers, I managed to verify the DZ1 and DZ2 and these work correctly, so I had come to the conclusion that I need to change the atmega324pa. I am from Argentina and it is difficult to get this microcontroller in the market, can there be someone else I can replace? also another query, if I do get to buy 324 fro

Geert · « **Reply #48 on:** March 04, 2020, 09:02:54 pm »

Is there a newer firmware available for the TC1 ?
My tester has version 2.12k

madires · « **Reply #49 on:** March 05, 2020, 09:36:42 am »

Quote from: Von Wuellmann on March 04, 2020, 08:00:29 pm

Looking at this same post about the answers, I managed to verify the DZ1 and DZ2 and these work correctly, so I had come to the conclusion that I need to change the atmega324pa.

Have you tried with DZ1 and DZ2 removed?


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Author Topic: TC1 lcr-meter transistor-tester fix (Read 198691 times)

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