|Gemini-2 and Gemini-1 Telescope Mount Controller|
|There is a new Question and Answer Wiki section where you can ask searchable questions.|
|Recommend Gemini-1 PCB mods to extend battery life/
|This mod is from the Gemini_Users group
Gemini's SRAM is not only used to store user catalogues and the observation
logs, but also an amount of parameters and matrices used for the modelling
algorithm. So it has a size of 128 kByte and is accessed (also for writing)
very often, far exceeding size and reprogramming life time of an EEPROM.
Normally, the Li CR2032 battery should last at least one year and should
keep the SRAM content safe and the RTC running. If CMOS Resets occur after
some minutes even with a fresh battery or battery lifetime is significantly
shorter than one year, I recommend the following patch for the electronically
1) Buy a small 39k resistor (with wires, not SMD)
2) Solder it between pin 2 (the second from above at the left side)
and pin 9 (the downmost at the left side) of the EPSON real time clock
chip labeled U2. The left side of the RTC is next to the SRAM chip U9.
You can do this on the component side or the soldering side of the board.
Power Gemini on/off. Wait. The CMOS resets should be gone.
3) Remove R38 to save Li battery power. Check again.
I've tested this modification with three different boards, one of them had
CMOS Resets. All work fine.
|This site is not for profit and sells nothing and asks for no money for any help it provides. This site is here to help fellow Gemini-2 and Gemini-1 owners. This Web Site is not associated with Losmandy-Hollywood General Machining Inc. or any of their employees and never has been. There is no guarantee that all the information is correct, but strives to provide the best information possible. The use of any information is at your own risk. The webmaster is an unpaid beta tester, and tries to work with other beta testers, and René the writer of the firmware.|
|Hit counter by http://digits.net|
|Your use of any information on this site is at your own risk.|
|copyright© - 2016-2011 Thomas Hilton -
Gemini-2 and Gemini is a registered trade names of Hollywood General Machining Inc.