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FLUKE 77 75 73 70 23 21 SERIES II MULTIMETER SM

METER - SERVICE MANUAL
Type: (PDF)
Size
5.9 MB
Page
64
Category
METER
SERVICE MANUAL
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    FLUKE II MULTIMETER 77 75 73 70 23 21 SERIES
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Relevant METER forum topics:
Fluke_9010A Micro-System-Analyzer with various CPU-POD's for sale
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                   
Fluke 8050A DMM Kijelző hiba
Üdv!   Átnézve a netet, nem igazán találtam egyszerű megoldást a javítására.  Kissé összefolyt a kijelzője, több ponton, óvatosan megnyomkodva most lehúzódott a folt az aljába egy sávba. Tulajdonképen most használható lett, ha középen megnyomom akkor a folt eltűnik és tökéletesnek tűnik, de vissza mászik egy sávba .  Van erre valami megoldás, vagy kuka ?
FLUKE PM3384b 100MHz 2-4 bemenetek digitális üzemmódban nem működnek
Sziasztok! A tárgyban nevezett szkóp 2-4 bemenetei nem működnek digitális üzemmódban. A sugár valahol "lent van", épp csak látni lehet az árnyékát. A szkópban lévő digitalizáló kártyán a csatornák 1-3 ,2-4 bemenetenként vannak összefogva. Mérések után úgy néz ki, hogy a jel bemegy a OQ0233 számú (egyedi Philips gyártmány) IC-be, de onnan már nem jön ki tisztes alakban. Ha esetleg valakinek volna ilyen kártyája megmaradva, azt szívesen fogadnám! Köszi a segítséget. Üdv, KN
Fluke ScopeMeter 105B Series II Display frozen / no Display
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.
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