Üdv!
Van egy fluke pm3370 kombiszkópom.A menüben van egy olyan rész ami kódot kér a belépéshez.Nem tudja véletlenül valaki,hogy mi lehet ez a szám?
Köszi!
Tisztelt kolegák,
ilyen FLUKE-val még nem volt szerencsém és segítségre, tanácsra volna szükségem. A szóban forgó multiméter bekapcsolás után bemutatkozik, hogy FLUKE truem RMS multimeter, majd üres képernyőre vált (habár egyszer úgy fagyott le, hogy a képernyőn maradt a bemutatkozási szöveg). Be marad kapcsolva, mert látom a labortápon, hogy cca 50mA-t húz és a zöld nyomógomb alatt világít a LED de onnent tovább semmi. Szétszedés után a kis elem rozsdásodásán kívűl semmi látható sérülést nem találtam nem is hiszem, hogy a kis elem lemerülése ilyen tipusu gondot jelenthetne.
Nyilván software hibára tippelek, habár nem kizárt az is, hogy golyózási problémában szenved mivel a NYÁK túloldalán ott van a proci, meg a perifériái, persze BGA-ban.
Mi itt a megoldás, hogyan lehet ezt a nemes műszert újra életre kelteni.
Üdvözletem
In my case the display of the ScopeMeter was frozen and the keyboard did not respond any more exept the on/off key. This happened always after the ScopeMeter has been switched on for a while. To find the temperature effect, I heated up the different parts of the Digital A1 board with a hair dryer. At some point, the device display stopped working completely and only the backlight was working. This effect was steady and irreversible.
To repair the device, you need the "fluke_92b_96b_99b_105b_servicemanual" provided here in the service manual area.
On page 272 in Figure 9.2b (Digital A1 circuit diagram, part b) the display contrast circuit schematic shows the NPN Transistor V1432 of type BC848C (see also the attached picture). Measuring the Base/Emitter diode showed a low resistance of 100 Ohms in both directions. Replacing that transistor by a NPN transistor of type BC847C solved the problem and the device was working correctly again.
The reason for choosing the BC847C instead of the BC848C are the Vcbo and Vceo of only 30 V of the BC848x series. The BC847x series has a Vcbo of 50 V and a Vceo of 45 V respectively and offers therefore a greater margin. The V1432 is placed between TP431 (LCDPWR, +5 V) and the -30 V connection from Analog Board A2. These conditions are too close to the absolute maximum ratings of the BC848x and are especially for higher temperatures critical.
I have a long list of Workshop proven & used CPU-Emulator -Equipment
with full original-documentation for each part.
I do not know if it is allowed "here", to make such an offer
and because it is a long list of 6-8 different CPU-Emulator-POD's
please contact me via p.m. if any interest.
You will then get a lot of more detailed pictures from the actual packed devices
Attention!
THESE ARE EXPERT DEVICES for Whorkshop and Repair-Technicians
used to read & work with IC's, Schematics and Datasheets (DAILY) !
It's like working with each CPU-Device-PIN
with full Control over its external PCB-World (elctrical & timing & TRI-State),
seen and working like from inside the specific CPU to the external Periphery !!!!!
And this works , regarding DATA- ADRESS- & Control-BUS-Signals
for different interchangeable CPU-POD's with a common handling & usage on this
BASIC FLUKE9010A -Device, with script programmable and Tape Safe/Resore facility.
best regards Norbert