- Fluke 73III fluke repair - 7 Updates
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- NUM 750/760 CRT monitor schematic - 2 Updates
| amdx <nojunk@knology.net>: Dec 20 05:26PM -0600 A couple years ago I bought a Fluke 73III at a yard sale for $20. Such a deal, I thought. Everything seemed good for a short time, then I noticed when the leads were reversed a dc voltage would measure almost double, then the ohms reading was way off. I put the meter to the side and used a different one. Yesterday I found a schematic so I thought I'd look at it. Only found it because I was looking at purchasing a 87V on ebay. First thing, it didn't power up, I thought maybe I had removed the battery. I opened it, the battery is there, but I had trouble getting it to disconnect from the snaps, so I took the board loose to have more room. I then measured the voltage on the PCB, it was 5.5 volts, then I measured at the battery 9.1 volts. hmm. I ended up using diagonals cutters and prying the snap open to get the battery out. There was some corrosion. I installed a new battery connector and battery. All functions now work and are accurate, I have a calibration unit and used it to check the meter every way I could. I guess it was just a battery problem, but I never noticed a low battery indication. I'm happy. |
| M Philbrook <jamie_ka1lpa@charter.net>: Dec 20 07:54PM -0500 In article <n57dan$dci$1@dont-email.me>, nojunk@knology.net says... > I guess it was just a battery problem, but I never noticed a low > battery indication. > I'm happy. Big Pat or a That Aboy! Jamie |
| "pfjw@aol.com" <pfjw@aol.com>: Dec 20 06:10PM -0800 Most Fluke meters have a lifetime warranty. Keep that in mind before doing major surgery. Peter Wieck Melrose Park, PA |
| Jon Elson <elson@pico-systems.com>: Dec 20 08:46PM -0600 amdx wrote: > I guess it was just a battery problem, but I never noticed a low > battery indication. Most other DVMs I've had would read accurately until the digits could no longer be read, LONG after the low-bat indication was on. At least one Fluke I had would start giving totally impossible readings as soon as the low-bat indicator showed. I guess there was less margin on the voltage reference. Kind of disappointing. Jon |
| Jeff Liebermann <jeffl@cruzio.com>: Dec 20 10:45PM -0800 On Sun, 20 Dec 2015 18:10:50 -0800 (PST), "pfjw@aol.com" >Keep that in mind before doing major surgery. >Peter Wieck >Melrose Park, PA Not exactly: <http://www.fluke.com/fluke/iden/support/warranties/> Each Fluke 20*, 70*, 80*, 170 and 180 series DMM will be free from defects in material and workmanship for its lifetime. As used herein, "lifetime" is defined as seven years after Fluke discontinues manufacturing the product, but the warranty period shall be at least ten years from date of purchase. *(Lifetime Warranty applies to products manufactured after October 1996). The Fluke 73 iii shows as discontinued: <http://en-us.fluke.com/products/electrical-testers/fluke-77-iii.html> No dates, so I can't guess(tm) as to it's warranty status. Drivel: I found an old Fluke 8060A true RMS meter at a thrift shop. I fixed it (cleaned the LCD contacts) but now I can't find the three plastic screws that hold the case together. They're under the mess here somewhere. ARGH! -- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
| Phil Allison <pallison49@gmail.com>: Dec 20 10:55PM -0800 Jon Elson wrote: > Fluke I had would start giving totally impossible readings as soon as the > low-bat indicator showed. I guess there was less margin on the voltage > reference. ** My rather old "Fluke 70 Series 2" displays the battery warning symbol at 6.4 volts - but still works fine to less than 5 volts. The LCD display is good down to 2.5V but readings are are crazy. ..... Phil |
| N_Cook <diverse@tcp.co.uk>: Dec 21 09:11AM On 20/12/2015 23:26, amdx wrote: > I guess it was just a battery problem, but I never noticed a low > battery indication. > I'm happy. With my Fluke 77 I've had that, erroneous slightly off values and no low batt symbol, but was due to low battery |
| mmaega@gmail.com: Dec 20 01:53PM -0800 It's 2015, but thanks to this forum i could repair my parents old Panasonic video. I followed the directions of Terry Mohan, i spent only 0.76 EURO and everything went perfectly. Thanks a lot, Terry. |
| sonnichjensen@gmail.com: Dec 20 01:19PM -0800 Hi This also has part number 0216 900 012. An example is here: http://www.ebay.com/itm/0216900012-NUM-750-760-MONITOR-9-MONOCHROME-26-KHz-0216-900-012-USED-WARRANTY-/281536283866 Does anyone know where I can find _any_ documentation on the beast? Preferably a schematic, but a manual might also put some light on it WBR Sonnich |
| Jeff Liebermann <jeffl@cruzio.com>: Dec 20 01:43PM -0800 On Sun, 20 Dec 2015 13:19:09 -0800 (PST), sonnichjensen@gmail.com wrote: >http://www.ebay.com/itm/0216900012-NUM-750-760-MONITOR-9-MONOCHROME-26-KHz-0216-900-012-USED-WARRANTY-/281536283866 >Does anyone know where I can find _any_ documentation on the beast? >Preferably a schematic, but a manual might also put some light on it When I can't find an exact model, I look for something similar, like this: <http://www.omnivisionusa.com/monitors/replacement-crt/crt-monitors/9-inch-monitor-.html> I run into similar monitors on old CNC machine controllers. Most of the time, they're not worth fixing (i.e. burned screen) so I use an LCD retrofit. Some VESA monitors will do 26 KHz. If I must buy a CRT: <http://www.relltubes.com/products/CRTs.html> 26 KHz seems a rather odd horizontal frequency. Any hints as to what equipment is the monitor installed, whether it's NTSC, SECAM, PAL, TTL, VESA, or HDMI, and what you are trying to accomplish? -- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
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