TH215A KENWOOD TH-215A handheld transceiver out-of-band modification: 1. Remove two screws from belt clip 2. Remove 4 screws from back of radio 3. Slide front assembly off 4. Locate set of 4 jumpers: (top front inside) +--------------------------------------+ $ $ $ +--------+ $ $ $ $ $ $ $ $ $ $ +--------+ $ $ $ $ +--------+ $ $ $ $ $ J4: intact $ J4 o---o $ $ $ J3: cut $ J3 o) (o +--------+ $ J2: cut $ J2 o) (o $ J1: cut $ J1 o) (o $ $ $ $ SPKR $ $ $ $ mic $ $ mic $ $ $ +--------------------------------------+ 5. Reassemble radio. 6. Reset microprocessor: Turn radio on while simultaneously pressing both _F_ key and _ENTER_ key. лллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллл Subject: KENWOOD TH-215A TO TNC THE HOOK-UP OF A TH-215A TO MY PAC-COMM TINY 2 TNC WAS VERY EASY. THERE ARE NO COMPONENTS INVOLVED IN THE CONNECTION. ALL YOU NEED ARE TWO PHONE PLUGS: 1 SUB MINI, AND 1 STEREO(3 CONDUCTOR) MINI. BOTH AVAILABLE FROM RADIO SHACK,TWO TO A PACK. IF YOU HAVE A KENWOOD SPEAKER MIKE, THEN THE INSTRUCTION SHEET WILL CONTAIN A DRAWING SHOWING THE BASIC CONNECTING LINES. IF NOT, HERES HOW ITS DONE: THE SUB-MINI IS THE SPEAKER PLUG. THE CENTER PIN GOES TO THE SPEAKER PIN ON THE 5 PIN DIN ON THE TNC, THE SHAFT IS THE GROUND. ON THE MINI STEREO PLUG, YOU DONT USE THE CENTER PIN, JUST THE TWO SHAFT CONNECTIONS. THE SHORT SHAFT GOES TO MIKE, THE LONG SHAFT IS THE PUSH TO TALK......THATS IT, FOUR WIRES TO THE CONNECTOR THAT GOES TO THE TNC PLUG, AND YOURE IN BUSINESS!! ONE VERY VERY IMPORTANT THING-----ALWAYS MAKE SURE THAT ALL BATTERY SAVE FUNCTIONS ON THE HANDY TALKIE ARE OFF. IF IT ISNT, A SLIGHT DELAY IN RECEIVING WILL CAUSE RETRYS FROM THE STATION SENDING TO YOU, AND WILL DELAY PACKET RECEPTION AT YOUR END. PLEASE MAKE CAREFUL NOTE OF THIS. ANY QUESTIONS, REPLY TO K2JOV, HARRY, AT N2ELC-4 BBS IN N.J......GOOD LUCK!! ллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллл th215a.2 144 - 165 TX/RX MOD TO OPEN YOUR TH-205,215,OR 225 ALL YOU HAVE TO DO IS TAKE OUT THE SCREWS ON THE BACK, AND GENTLY OPEN UP THE FRONT OF THE UNIT...LOCATE THE OBVIOUS 4 JUMPER BRIDGES ON THE PC BOARD. THE BRIDGES ARE NUMBERED J-1, J-2, J-3, AND J-4..JUMPER J-3 HAS ALREADY BEEN CUT...CAREFULLY SNIP JUMPERS J-1 AND J-2 AND EVER SO SLIGHTLY SEPERATE THE SNIPPED BRIDGES TO INSURE NO-CONTACT BETWEN THE POINTS.. REASSEMBLE THE UNIT..LOOK AT YOUR INSTRUCTION MANUAL AND RESET THE MICROPROCESSOR..THE MOD WILL NOT WORK UNTIL YOU RESET THE MPU... THE INFO. FOR RESET IS NEAR THE BACK OF THE MANUAL..AFTER THAT THE UNIT IS WIDE OPEN TO OPERATE BETWEEN 144 TO 165...GOOD LUCK ..BILL N6WPG ллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллл TH215.3 Date: 05 May 90 13:41:36 UTC (Sat) From: wa2ise@kd6th.nj.usa (Bob) Message-ID: <25694@KD6TH.NJ.USA> Subject: a TH215 no audio fix Newsgroups: rec.ham-radio Subject: Re: Kenwood TH-215A no audio problem Organization: Hewlett-Packard Co., Corvallis, OR, USA PROBLEM: >In a sample population of about 60 amateurs in this town, three of us >own Kenwood TH-215A HT's, all purchased separately at different times >from different sources.... >ALL THREE have developed an audio problem in the last eight months: >the audio (both from the microphone and from the keypad) simply >disappears at unpredictable intervals. And all three can be "fixed" >by WHACKING the HT with the palm of one's hand--until it happens again. A POSSIBLE FIX: You guys may be in luck, since I fixed mine -- I have the service manual and decided to jump in (I had upgraded the software and you have to pull the unit completely open to do it -- ). Anyway, I was using the rig one day and the next -- no audio -- just a slight noise that appeared to be white noise from the final audio buffer. When plugging in the speaker mike -- same problem. Touch the TTPAD and get your ears blown away -- I think beep also worked. Kenwood had no knowledge of previous problems. I had to rig-up a jumper ribbon cable so I could lay the rig out for testing and immediately checked the input audio to the volume control. No problem -- but there was nothing coming out the other side. I jumpered the pot (i.e. simulate pot max volume) and my ears were hurting. Upon removal of the pot I found a crack on the ALPS pc board that has the leads mounted to it. Apparently, I must have hit the volume control pot the previous day and cracked the pot trace (again this trace was part of the pot not the rig pcb). I had noticed when I disassembled the unit that there was no nut on the pot to hold it in place (none on the squelch either). The volume pot is right at the edge of the unit and is the most likely knob to get hit. When parts arrived, it came with a nut so I installed it to help prevent this problem in the future -- no problems since. I think the switched volume pot cost $4.95 + $3.00 shipping. I also picked up a set of backcase screws -- very small heads but very long screws to replace my old ones -$.05 - Make sure you have a "good" screwdriver that really fits.) All these problems sound like the same thing. I have never had any problems with my rig, and I bought one of the first ones out. (Hence, the software update to give me the ability to lock out memory channels during scan.) Hope this helps. Greg May gregm@hp-pcd.HP.COM Note: I haven't tried or verified this, proceed at your own risk! WA2ISE % ллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллл TH215.4 Kenwood TH-215A / TH-215E Frequency Modification. _____________________________________________ I'm not quite sure why we all do this, but here's how anyway. In order to increase the frequency coverage of the Kenwood TH-215 Series Handheld Transceivers, a few jumpers inside the radio need to be cut. No retuning is necessary. WARNING: The radio is compact internally; if you do not have the delicate touch of a surgeon, forget this mod or get a radio surgeon friend to do it for you. Tools you will need : #1 Phillips Screwdriver #2 Phillips Screwdriver Diagonal Cutters (Very Small!) Remove the Battery Pack, Antenna and Belt Clip. Remove the 4 small screws in the recesses near the 4 corners of the back of the radio. Do not separate the cases yet! Place radio on a clean soft work surface Face-Up. With the antenna connector facing away from you. Lift the front case of radio STRAIT-UP. When clear of the rear case, rotate the front case to the right and lay it on the work surface Face-Down. Do Not Damage the Flat Cables. KEEP YOUR FINGERS OFF THE ELECTRONICS! Notice the 4 Copper colored jumpers on the surface of the circuit board inside of the front case cover. These are located 1.5 inches "NorthWest" of the center of the speaker. They are numbered J1 thru J4 from the bottom to the top. J3 is already cut on the TH-215A. Remove the jumpers as selected from the table below by cutting through the thin area at the center of the jumper. BE CAREFUL! Reassemble Radio. All memories will be clear and the display will be at the lowest Transmittable Frequency (i.e. 141 or 144). _____________________________________________________________________________ The Operating Frequencies are programmed by cutting jumpers as follows : Jumpers. Transmit Freqs. Receive Freqs. Remarks. No Cuts 144.0 - 145.995 144.0 - 145.995 TH-215E J3 144.0 - 147.995 141.0 - 162.995 TH-215A J3,J1 141.0 - 150.995 141.0 - 162.995 J3,J1,J4 141.0 - 162.995 141.0 - 162.995 Note: J2 has no apparent function, leave it IN. ллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллл