> Thanx all for your tips !!! I had so many responses. One ham told me > about a grounding problem. A printwire connecting to the - in the > power connector was broken. It is very simple to test. I connected the - > of the powersource to the grounding point of the tranciever an > it worked :-) now i only have to bypass the broken printwire. > > Many thanks to all !!! > > Arjan Bekkema. > PE1NNQ > > > > --- In FT817@yahoogroups.com, kc3vo@a... wrote: Cables "neatly bundled and tie wrapped" MAY have prevented the cable attached to the radio from flexing, resulting in too much pressure on the power connector, causing it ti break internally, or loose contact at the board solder interface. BEFORE you try to remove/replace ANY parts, take a voltage measurement at the internal power connector, with internal batteries removed, and external power applied, to see where your problem is. You do NOT want to damage the multi-layer P.C. board by GUESSING and "easter egg hunting"--be CERTAIN that a component is actually defective BEFORE you attempt to remove/replace it, as damage to the board can result in a VERY expensive situation! (it is LIKELY that you have a cracked solder joint, in the vicinity of the external power connector, due to physical stress.) re-do your wiring/packing to eliminate undue pressure/tension on the external connector/wire.------------------ - -----73, KC3VO-Bob ============================================================================= http://www.dierobben.com/users/bekkema/Ham/power_fix.htm 817 Power Fix Hello, After building my backpack rack I experienced a strange problem. The radio would not except external power. Internal power (battery) was no problem. I posted this message on the FT-817 group forum (groups.yahoo.com) Hello, Thanks for reading this message. I own a FT-817 for 3 months now, I was a very happy owner and made lots of nice contacts with the FT- 817 until yesterday. I made a wooden frame for my backpack to do some walkabout. After mounting all the hardware (FT-817 & Z-11 & Gel power pack 7,5 AH & ATX Walkabout) and triple checks I was ready for a field trip. When I tried to operate the radio, the radio was dead. :-( Here is how I connected the lot: Power pack --> Fuse --> FT-817 \--> Fuse --> Z-11 The fuse was a 3,15AF glass fuse in only the plus lead for the FT-817 and a 1AF glass fuse for the Z-11. When I got home I was able to do some testing. The Z-11 worked fine. Both fuses are ok. The 12V power got to the FT-817 connector. And still the FT-817 was dead. The I tried the battery compartment. Inserting some battery's then the FT-817 worked again :-). Has anyone had the same problem? Time to look at the schematics of the main unit (lower right corner): I think (I had no time to verify) that D1085 (RB051L-40) is RIP. This looks like the only possibility to me before the battery power joins the line. I hope there is some one that can verify this, before I order this part. How is this possible? I was working on a gel powered pack (max 12,3 V) I have tested the pack lots of times. All cables are neatly bundled and ty-rapt to prevent movement. All power connectors are insulated. What can I do to prevent this in the future? Thanks for reading, I hope you can help me Bernard responded with the best tip: The connection between the V- and Mass could be broken. Easy to test. Just place a wire between the V- of the power supply and the grounding terminal of the tranciever. And it worked!!! What is the problem: Some how the grounding wire between C1453 and C1452 was broken. (I think it was part of a short circuit when inserting the connector). With a bit of solder tin and a small tip iron I made a tin bridge from the condensator to the - of the connector. Be very careful with this. Solder at a low temperature and watch out for the other components and print wires. The FT-817 works as before !!! This is how I solved this problem. I can not and will not garantee that this will also work for you (if you have the same problem). Do not do this until you are sure what you are doing and take your time to do it. ============================================================================= ============================================================================= ============================================================================= ============================================================================= ============================================================================= ============================================================================= ============================================================================= ============================================================================= ============================================================================= ============================================================================= ============================================================================= ============================================================================= ============================================================================= ============================================================================= ============================================================================= ============================================================================= ============================================================================= =============================================================================