First preliminary tests with the data logging issue:
- Holding long the REL button does not bring anything on display.
- At startup there is a moment where all the LCD annunciators are on, there is nothing that I can see that suggest any kind of PC link or data logging.
- Looking closer on the PCB around EEPROM there was some rework stuff done, a resistor (WP ?!?) seems to have been removed.
This post will be edited after scoping the test points and/or if I can read the EEPROM.
EDIT1: these are the test points scoping results:
Pt1.7 - Beautiful buzzer signal, 'cause this is so much need
Pt1.0 - Some signal ONLY when pressing once REL, it looks like some very shot spikes with 30ms spacing, RIGOL's anemic RS-232 decoder is not avle to do anything with it.
Pt1.1 - Solid one.
The bloody buzzer produces a 200mV signal mirroring on the power supply, probavly the consumtion is enormous, but the electricians want loud buzzers.
Now, I can unsolder and read the EEPROM as well as trying to do the modifications in the previous PDF, please tell me seriously if it is worh doing.
Cheers,
DC1MC