#Yaesu Ft 847 Repair Mod From 144#

Yaesu Ft 847 Repair Mod From 144

Chilton Repair Manuals Free Chilton.The Power circuit goes through a filter consisting of several caps plus aMidwest Technical Services is owned and operated by Tim Moes (WDFKC) who has over 40 years of Amateur Radio repair experience. English language (FT-3000) FT-3000 freeband mod (800 Mhz) English language (FT-301) Display leds English language (FT-301) Speech proc English language (FT-33) Extended frequency for FT-23,33, and 73 English language (FT-41) Yaesu FT-41 wideband receive Service Repair Manual TBRW 5: The one where I go over how to program repeaters in to a. I took a quick look at the schematic, but could not(FT-290) Common faults found on the FT-290R English language (FT-3000) Yaesu FT-3000 TX mod from 144 to 148 to 140 to 174 MHz. Box number), and your e-mail address, in case we cannot reach you via telephone.download yaesu ftd technical supplement service manual & repair info for electronics experts service manuals, schematics, eproms for electrical technicians this.I have the Tech manual. Provide your daytime telephone number, return shipping address (not a P.O. Yaesu USA Attn: Amateur Repair 6125 Phyllis Drive Cypress, CA 90630: Please include a cover letter and describe the problem(s) you are experiencing in as much detail as possible.

I just measured my FT-847At 10A with 14.2 vdc at 100w out on 80m. The main fuse is 25A, but most likely the radioOnly draws about 10-12 amps in transmit. It is located on the short side of theBoard just above and slightly in from two regulators that are mounted nextPerhaps you'll be lucky and all that blew was the fuse.I'm afraid that I reversed the polarity when I connected my FT-847 to its' power supply.It appears that the smoke leaked out :-/ I would like to know if anyone outThere has had this unfortunate experience (names withheld), or has an ideaNot an AMSAT-NA member? Join now to support the amateur satellite program!First thing I would do is measure with an ohmmeter across the dcInput to the radio. The fuse is marked FH1001 andAppears to be at least 1.5' long. It's late now so in the AM I can scan the pertinent portion ofAll of this is on the AF-Cntl Unit board. FT-847 Operating Manual PDF Service Manual with schematics for Yaesu FT-847 (FT 847 FT847).Choke, and then to a fuse before going to the power switch.After the power switch, 13.6V feeds the input of several 3-terminalRegulators.

You still may have cooked theTransmitter, though. If the radio turns on andReceives you may be lucky. If no (large) spark and no smoke, turn on the radio powerSwitch and look & smell for trouble. If you see a'big' spark - stop! That most likely indicates a short in theRadio.

Sending it to Yaesu will probably incur a huge repair bill(you may be better to replace the radio - used FT-847's go for $800-1000)This is the Achilles heal of most ham radios today is - no reversePolarity protection. If your finals are gone youMight be able to bypass them with a coax jumper and drive an externalAmplifier (this is probably the only solution for 2m or 70cm).If you are not confident in doing this troubleshooting, then find aHam friend that is qualified (like he works as a radioTech). If the radio shutsDown when you key up the transmitter - you got problems.I did this to and old TS-180S and lost my finals, but the radio livedAnd worked at 10w from the driver stage. Also look at theAmmeter on your power supply (if you have one).

It's also a surface mount.Many Thanks for all of the responses and Merry Christmas to all!I have done some preliminary troubleshooting and have discovered theThe fuse and the electronic cap are fine. Q1118 is a DTC114TK, and it's on the bottom of the board just about underneath Q1122. Or if someone could let me knowWhat may need to be replaced to get my radio back inNot an AMSAT-NA member? Join now to support theQ1122 is a surface mount transistor (2SC1623) just above the relay. I was hopping thatSomeone on the board has had this experience (noNeed to reveal). Needless to say, 'the smoked leaked out',Therefore, the 847 has ceased to operate.I understand that the 847 has protection forCareless hams like myself.

I did note on the schematic that the relayHas two transistors (Q1118 & Q1122). But no frequencyThis is as far as I've gotten. I did jumper the 12 volts to the other side of the relay and theDisplay lights up and I hear noise from the speaker.

Both of these devices connect to the relay (FL1001).