- #MOTOROLA R2670 SERVICE MANUAL HOW TO#
- #MOTOROLA R2670 SERVICE MANUAL MANUALS#
- #MOTOROLA R2670 SERVICE MANUAL DOWNLOAD#
Carefully checking not to destroyĪny driving circuit, I did override the control voltage input using an external volatage source, and look here: Input of the VCO (Pin 4) changed its level and the signal at J1 changed frequency. At some frequency setting the range selector
The supply voltage was OK, the control voltage was stuck at one end. Soldering wires and re-seating the board into its box again. Module, I started to check the supply and control voltages of the VCO module, using the same technique of The VCO box, maybe there's more shielding? Looking at the schematic page concerning this part of the high synthesizer The VCO is in its own shielded box inside the shielded box inside the shielded card cage. I had to remove the VCOs shield to gain access to the signals around the VCO module. Next I suspected the VCO module to malfunction, since this is the source of the bad signal. The relevant power supply rails, re-seated the board into the card cage and checked the supply volatages.
In the first place I soldered some wires to Pretty much shielding, the right two SMB connectors carry the 1st GEN LO. Next step: I removed the high synthesizer module from the card cage. Other signals, like the LO SYNTH RF from the low synthesizer module looked fine. Was some signal visible, but not at the expected frequenzy and at least 20dB lower level than expected. Pretty fast I discovered that the high synthesizer module didn't output the 1st GEN LO signal. I found it easy to pull one SMB cable after another and compare the real signal (using the R3131) to the expectation. Looking at the generate mode block diagram: So I needed some point to start the basic diagnosis. Having the manual, the SMB RF cables started to make sense to me: Luckily I was able to borrow such an instrument (an Advantest R3131 9kHz. Your average scope simply won't show anything if you try to follow a 1.7GHz signal. Was easy for me to discover that I'm in the need of some RF instrument (preferably a spectrum analyzer) to do Having this comprehensive information, it For each board there is also a fine description of how it works.
#MOTOROLA R2670 SERVICE MANUAL MANUALS#
Various other old motorola manuals additionally to my needed service manual.Īs it is quite usual with such old equipment, the service manual contained full schematics and parts lists of theīox. Cool service, the DVD arrived some two weeks later and contained
#MOTOROLA R2670 SERVICE MANUAL DOWNLOAD#
I ordered that DVD and got the RLN-4120 manual in advance asĪ download link short after placing the order. Manual compilation on a DVD for a reasonable price. I found an offer from Canada, some kind of ancient Motorola Using this designator with your favourite search engine, Still searching around for the manual, I finally discovered the notation "RLN-4120B" beeing the service manuals Please read his info page and consider supporting this great site. As many of these sites, it is run by a private person, making no profit. In case you're looking for these files, have a look at KO4BBs manual collection: (go to Manuals and search for R2600). In the meantime, the forum mentioned above disappeared. I decided to download these images and keep themįor later experiments, once the unit would be in a more useful working state. I found an internet forum, search for R2600 where people exchangedįirmware and option EEPROM images, which looked interesting to me.
No idea where to start without any knowledge of the signal routing.įinding useful information turned out to be somewhat difficult. Lots of neat SMB cables route lots of unknown RF signals from one RF PCB to another. Opening the box, I was pretty fast persuaded that I'd have to find a service manual before attempting to repair anything: See if I would be able to repair this thing. After a few days, I took the challenge and decided to The unit aside and thinked about scrapping or reselling it. So now I was the proud owner of a pretty useless Radio Test Set, since none of the RF functions worked. Baseband audio analysis worked, using the baseband signal input.A quick check in generate mode showed that there was some kind of a signal at the gen out port, but neither of the expected frequency nor amplitude.When the self calibration finished, there were no error messages and I was able to play around with the various menus and settings.The unit powered up running a quite lengthy self calibration procedure.After receiving and unboxing, I've learned pretty fast, what Its description said something like "I've tested a little bit of the functions, which appear to work, other functionsĪre not plausible to me.
#MOTOROLA R2670 SERVICE MANUAL HOW TO#
Motorola R2600B R2600 Radio Communications Analyzer Repair or how to jump start with RF electronicsįor no particular reason, I bought this particular pretty looking piece of electronics at our favourite electronics scrap yard
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