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HP8568B battery replacement

Lou Blasco All Messages By This Member #143340 Hi, I have a HP8568B reporting the battery?is low. I have some 8568B manuals from Artek but I can't find anything in them?that looks like battery replacement instructions. I know I have to take a picture or transcribe the calibration measurements before I start. Can someone guide me to the correct document number please? FWIW, this is what I have. 9018-05833.pdf 9018-05834.pdf 9018-05860.pdf 9018-05919.pdf 9018-06816.pdf 85662A-TSM.pdf 85670A-85680B-TRM-V1.pdf 85670A-85680B-TRM-V2.pdf 8568B-IVM.pdf 8568B-PTA-2.pdf 8568B-PTA.pdf Regards Lou VK3ALB
Lou Blasco All Messages By This Member #143341 Never mind, Procedure starts on page 1-13 of the Installation & verification Manual - 8568B-IVM.pdf Regards Lou VK3ALB toggle quoted message Show quoted text On Thu, Apr 11, 2024 at 3:53?PM Lou Blasco via <vk3alb=[email protected]> wrote: Hi, I have a HP8568B reporting the battery?is low. I have some 8568B manuals from Artek but I can't find anything in them?that looks like battery replacement instructions. I know I have to take a picture or transcribe the calibration measurements before I start. Can someone guide me to the correct document number please? FWIW, this is what I have. 9018-05833.pdf 9018-05834.pdf 9018-05860.pdf 9018-05919.pdf 9018-06816.pdf 85662A-TSM.pdf 85670A-85680B-TRM-V1.pdf 85670A-85680B-TRM-V2.pdf 8568B-IVM.pdf 8568B-PTA-2.pdf 8568B-PTA.pdf Regards Lou VK3ALB
Ed Breya All Messages By This Member #143342 I'm not absolutely sure of the details, but as I recall, the 8568A (and 8566A) to "B" conversions changed it from an off-board 3-cell NiCd HP35 calculator-style pack, to a single 3V Li-ion cell soldered right on the (new design) processor board. Some of the info may be missing because of all the big changes involved. There were total swap-outs of the brain system, plus a field-installed A-B upgrade offered around the same time. If you have a "B" of whichever, you should find the backup Li cell on the uP board, in the right-rear board cage compartment of the RF section, viewed from the top, as I recall. Or was it the bottom? The structure is such that the 8566 RF unit is accessed upside down, and I don't recall if the 8568 is the same. I know for sure that whatever the arrangement, the uP board is right next to the GPIB board, so just find that from the outside. It's not obvious from the inside, since there's an Al lid that covers the digital controller boards. Removal of a single screw should release it. Ed
Gianni Becattini Member Profile All Messages By This Member #143344 My had both, but I concluded that the big one (HP-67 style) was not used, so I changed only that on board and it works.
Raymond Domp Frank Member Profile All Messages By This Member #143354 On Thu, Apr 11, 2024 at 10:57 AM, Gianni Becattini wrote: My had both, but I concluded that the big one (HP-67 style) was not used, so I changed only that on board and it works. Hi Gianni, I'm one of the many that have admired your beautiful books from the beginning but haven't posted about that. As regards your above post, I'm not sure what you mean by "both": Two NiCds? BTW, the HP-67 also uses the smaller 3-cell (HP-35 style) battery, the HP-97 (and HP-91) use the bigger, 4-cell type. Raymond
Gianni Becattini Member Profile All Messages By This Member #143450 开云体育 Hi, you make me happy! I am writing them just for myself but is wonderful to know that someone else read and appreciate them! I am not sure about my 8568B and why it had two batteries, but the old one (that calculator style) was not going to anything. Maybe someone changed the board with a new one. Thanks again Gianni toggle quoted message Show quoted text Il giorno 11 apr 2024, alle ore 14:42, Raymond Domp Frank via groups.io <hewpatek@...> ha scritto: On Thu, Apr 11, 2024 at 10:57 AM, Gianni Becattini wrote: My had both, but I concluded that the big one (HP-67 style) was not used, so I changed only that on board and it works. Hi Gianni, I'm one of the many that have admired your beautiful books from the beginning but haven't posted about that. As regards your above post, I'm not sure what you mean by "both": Two NiCds? BTW, the HP-67 also uses the smaller 3-cell (HP-35 style) battery, the HP-97 (and HP-91) use the bigger, 4-cell type. Raymond
Raymond Domp Frank Member Profile All Messages By This Member #143451 > I am not sure about my 8568B and > why it had two batteries > The model 8568A uses the calculator-style battery, the 8568B doesn’t. AFAIK, it has a Li battery on the CPU pcb.? A field upgrade was available and I guess that’s what happened to your 8568B. Raymond
Dave McGuire Member Profile All Messages By This Member #143454 On April 13, 2024 4:24:42 PM "Gianni Becattini via groups.io" <Giovanni.becattini@...> wrote: Hi, you make me happy! I am writing them just for myself but is wonderful to know that someone else read and appreciate them! I read every page! Wonderful stuff. -Dave -- Dave McGuire, AK4HZ New Kensington, PA
Don Bitters All Messages By This Member #143459 Gianini, The reason that you had 2 different batteries in your 8568B (it used to be an A before the B mod), the person that did the mod did not remove the 3 cell battery pack, which he was supposed to do per the B installation note. The only battery used now is on the A15 brd. in the RF section. There are no calibration factors stored in this memory, only user settings are kept alive with this battery. If you run the self correction routine those values may be kept in the battery backed memory., until you run the correction routine again. The attenuator corrections are stored in the EProm that is replaced when you change the attenuator, IIRC it may be A15U8??. Don Bitters

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