This operating manual is the common manual to the FTDX5000, FTDX5000D, and FTDX5000MP. Congratulations on your purchase of the FTDX5000 Yaesu.

I don't have a service manual for your radio, but many devices use the ubiquitous MAX232/SP232 RS-232 Level Shifter IC (and similar) as the intermediary between their internal 3.3/5V TTL logic level signals and the much higher voltages found on a true RS-232 serial port. Because this chip is usually directly exposed to the external serial port pins it can be damaged by a power surge (e.g. Lightning), a severe ground loop condition, or an unusually severe electrostatic discharge event. As such, replacing this interface IC (which may be either through hole or SMD) has a good chance of repairing the board if it was damaged via an event on the external serial port. This may be worth looking into as the IC, if present in your device, only costs a couple dollars and replacing it may save you some time and money versus replacing the entire CAT board.

Click to expand.Good advice. ESD tolerant devices (~ 15 kV) are available from Maxim and other manufacturers. Maxim designed some of these parts for the portable and laptop markets. The Maxim MAX3237E, MAX3380E and MAX3381E are three examples of transceivers that are suited to this task (ESD protection).

Datasheet === IF you can 'Pull Up' the Schematic and Board layout for the C52075701 CNTL board (FTDX 5000 Service Manual), you should be able to identify the likely part driving the DE-9M connector (CAT port). Yaesu FTDX 5000 Technical Supplement (Service Manual, 282 pages, K9ROD repository) --- Using Adobe Acrobat Reader: PAGES 150-161 CNTL Board Analog Devices ADM3202ARU (SMT part) -- part # Q4508 -- Yaesu part # G1094022 This appears to be the IC driving CAT port. THIS PART does have ESD protection.

I know this is an old thread but very interested if you ever got this problem repaired? I suspect I have the same problem on my radio also. This is a second hand radio and I think the previous owner caused physical damage to the CAT port by inserting and removing the plug in an up and down fashion. The port is only held on by solder joints on the board and can be very easy to break as seen from the service manual. I have not opened the radio but suspect this is the problem. Let me know if any others have experienced this problem and what you did to fix.

Thank you & 73. More often than not such damage frequently just breaks any poor solder joints and resoldering the serial port interface will often fix that issue (a simple repair).

If the traces on the board were actually damaged then you may need to run bodge wires to reconnect any damage traces to an undamaged portion of the trace or another pad that carries the same signal in order to restore proper operation. However, it is also possible to get RF (particularly from an unbalanced or nonresinant antenna with an inadequate station RF ground) or a surge from lightning or static buildup on the serial port if it is not galvanicly isolated from the PC it connects to which can damage the RS-232 level shifting IC (often a MAX232, or equivalent, IC) or other upstream logic (as well as potentially damaging the PC). For this reason it is good practice to install isolators between the radio and any connections and electrical paths back to the attached PC which effectively breaks the electrical connection between the radio and PC up to a few thousand volts, high enough to ensure the surge protection you have (hopefully) installed at the feedline entry point to your home to do their job and begin clamping any high voltage or surges entering from your antenna (including induced surges from nearby strikes as well as electrostatic buildup).

Yaesu FTdx-5000 (including D and MP versions) Reviews Summary for Yaesu FTdx-5000 (including D and MP versions) Reviews: 137 Average rating: 4.7/5 MSRP: $5750 (D version) Description: The FT dx 5000 Series HF/50 MHz 200 Watt Transceivers are a new Premium Class of Yaesu radios with 2 Independent Receivers plus many unique options and accessories designed to meet the Performance Requirements of even the most demanding serious Amateur Radio operator. Product is in production. More info: Email Subscription You are not subscribed to this review. You can of the Yaesu FTdx-5000 (including D and MP versions). Page 4 of 14.