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| Keithley 2306 Dual Battery Simulator Repair (maybe) |
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| Smokey:
One more post here to thank everyone that posted ideas, and helped troubleshoot. You guys are the best! |
| Smokey:
Grrr..... Saga continues... This power supply has been acting up again. It's been need to warm up for a couple minutes for the internal display to work. Once it's warm it will work fine when you power cycle it... at least it was doing that. Now the internal display won't come on even after it's been running..... The external display still works though so I know the unit is powered up and working. I'm going to replace the MC34064 voltage monitor chip on the internal display board, and I'll see if that fixes it. Parts ordered. |
| ottobad:
Hello, I have a Keithley 2306 and it suddenly appeared INITIALIZING ... and that's all it does. I took it apart and measured internal source , its source outputs 12VDC, after that the LM2940 outputs 5VDC, and then if I measure TP 101,102,103...nothing. On the CR102, rectifier bridge, I have nothing on the alternative and nothing on the DC, as well as the next module. I measured on SRAM and 2.5VDC comes in... what should I measure or where should I start? Thank you and sorry if I disturbed you. |
| Kean:
--- Quote from: ottobad on July 14, 2023, 01:50:47 pm ---Hello, I have a Keithley 2306 and it suddenly appeared INITIALIZING ... and that's all it does. I took it apart and measured internal source , its source outputs 12VDC, after that the LM2940 outputs 5VDC, and then if I measure TP 101,102,103...nothing. On the CR102, rectifier bridge, I have nothing on the alternative and nothing on the DC, as well as the next module. I measured on SRAM and 2.5VDC comes in... what should I measure or where should I start? Thank you and sorry if I disturbed you. --- End quote --- I think you need to enable the channel before voltages will appear on those test points. If it is stuck on INITIALIZING then I guess you cannot do that. If the main 5V voltage looks OK, then per the above post #10 the SRAM chip could be the culprit. You mention 2.5V on the SRAM, but I think it should be powered from 5V rail. What pin did you measure 2.5V? I bought mine on eBay knowing it may have similar issues, but so far it has been fine after I recalibrated it. |
| ottobad:
It stuck on INITIALIZING, also no service manual on internet, anyone have it here? I measure SRAM chip on pin 32Vcc and pin 16, i have around 2.5Vdc. Do you know who supply voltage to sram chip? I will order from Ebay the SRAM chip....Being a RAM, does something need to be written, copied from the old one? Thank you for reply. |
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