johannes, check mail..;) --- In PolySix@yahoogroups.com, Johannes Hausensteiner <johau@...> wrote: > > Hi, > > I am afraid I cannot help you with the noise remotely. The Polysix is > quite noisy. Most of it comes from the BBD circuits of the KLM-368 > board. You might take the signal directly from CN14 of KLM-366. This > is the pure synthesizer signal, before going through the KLM-368 > effects board. > > ARP: > It might be that ARP On/Off button does not work. You could try with > the lid open to make a temporary short across the button contacts > with a pair of pliers or a wire. These buttons wear out. > > Good luck! > > Johannes > > > On 2012-12-05 18:57, Arp Duex wrote: > > see comments. > > > > > > ________________________________ > > From: Johannes Hausensteiner <johau@...> > > To: PolySix@yahoogroups.com > > Sent: Wednesday, December 5, 2012 7:24 PM > > Subject: Re: [PolySix] Re: klm 367 board > > > > > > > > Hi, > > > > 1) Noise: > > - Does the noise change after you play (a) key(s)? > > - I have seen somewhere instructions for making an electric shield > > between the KLM-368 and KLM-369 boards. Maybe this woiuld help. > > > > > > //nope.. noise is there.. disapearing and reapearing in no regular > > fashion. at least i could determine any pattern. > > > > 2) Arpeggiator: > > - How does it behave when you are saying "it is dead"? > > - Does the ARP On/Off button LED work as expected? > > - Does the LED flash according to the speed setting? > > - The ARP trigger signal is routed through the rear panel "ARP Trig In" > > jack. This is a "normalized" jack, maybe the contacts are dirty; or > > one of the connections is bad on KLM-366, KLM-371. > > > > > > // led is flashing but when hittin the arp button it remains off. > > i'll check the jack. > > > > Good luck! > > > > Johannes > > > > On 2012-12-05 15:33, Arp Duex wrote: > >> Hi, > >> > >> > >> Yes. Found the guidelines for calibrating them. The noise on output puzzles me. Sometimes appear / sometimes disappear for no apparent reason. > >> > >> Arpegiator still dead. > >> > >> > >> I will continue the troubleshooting tommrow. Now I need a beer. > >> > >> > >> Thanks guys > >> Razvan > >> > >> > >> > >> ________________________________ > >> From: tonezone020 <swamp.gigs@...> > >> To: PolySix@yahoogroups.com > >> Sent: Wednesday, December 5, 2012 4:06 PM > >> Subject: [PolySix] Re: klm 367 board > >> > >> > >> > >> Hi, > >> > >> Guidelines for calibrating each voice are in the service manual... > >> > >> T > >> > >> --- In PolySix@yahoogroups.com, "arpm234" <arpm234@> wrote: > >>> > >>> Hey Johannes, > >>> > >>> Thanks a lot for the ideas. I've tested this morning the RESET signal of the main cpu and whatever i did, there were constantly 4.6 v there so by following the schematics I noticed it linked to the comparator IC5, LM393 which was bad in a way that pin 7 (output) and pin 8 (vcc) were internally shorted. > >>> > >>> Replaced that and everything came to live. Including keyboard and tones. > >>> > >>> NOW, There are still things to figure out. > >>> > >>> 1. Arpeggiator not working. > >>> 2. There is a noise around 22khz at output, like a self resonant thing like an old tube while functioning or like a camera flash when charging. very annoying. > >>> 3. each and every voice may need calibrating as each one is different in volume, pitch or filter. are there any guidelines for this? > >>> > >>> thanks again. > >>> > >>> Razvan > >>> > >>> --- In PolySix@yahoogroups.com, Johannes Hausensteiner <johau@> wrote: > >>>> > >>>> Hi Razvan, > >>>> > >>>> I think there are two different problemes: > >>>> - KLM367 CPU not starting > >>>> - KLM366 Key Assigner behaving wierd > >>>> > >>>> First thing ist to make the KLM-367 CPU start reliable. Check the power > >>>> supply for correct voltages and perform the reset circuit adjustment > >>>> procedure given in the service manual. > >>>> The test pulse at TP4 *is* in 20msec intervals. The pulse itself is > >>>> very short. > >>>> Check the resonator frequency at IC22 (CPU) pin 3. It should be ca 6MHz. > >>>> > >>>> Second: The KLM-366 has a test mode as well. "It is started by jumpering > >>>> pins DB7 and P17 using a diode (cathode towards DB7) on the 8049 > >>>> processor on the KLM-366 circuit board (this can be done on the > >>>> keyboard connector CN04). In this mode the CV DAC is set to generate > >>>> 0V, 2.5V, or 5V depending on the position of the OCTAVE switch (16' > >>>> results in 0V, etc.)". > >>>> You can check this voltage at KLM366/IC9/pin1. > >>>> Check the reset signal. KLM-366 is in reset when switching to Tape > >>>> Interface mode. Check the resonator frequency. It should be like on > >>>> KLM-367 6MHz at CPU pin 3. > >>>> > >>>> Do the buttons behave normally? (Porbably not...) > >>>> The BANK, MANUAL, and PROGRAM buttons operate on the KLM-367 Programmer > >>>> CPU, whereas the ARP, HOLD, UNISON, CHORD MEM, and POLY buttons operate > >>>> on the KLM-366 CPU. > >>>> > >>>> Good luck, > >>>> > >>>> Johannes > >>>> > >>>> > >>>> > >>>> On 2012-12-04 20:27, arpm234 wrote: > >>>>> nobody ? > >>>>> > >>>>> --- In PolySix@yahoogroups.com, "arpm234" <arpm234@> wrote: > >>>>>> > >>>>>> Hello, > >>>>>> > >>>>>> I've did some tests today and here;s what i found: > >>>>>> > >>>>>> TO CONFIRM: cpu seems to be working fine since i was able to see the clock on TP4 on osciloscope. Strege thing that somebody mentioned the gap should be 20 ms and i meassured 10ms. Is this ok ? Also the TP2 spot looks ok - The multiplexed signal from the pots it is there. > >>>>>> > >>>>>> PROBLEM: there cpu starts randomnly. A few power off - power on cycles are necesary to get the clock there. I this this is related of the bad 4 x 74ls75 found on the control panel board. Two of these latches seem to be dead. > >>>>>> > >>>>>> PROBLEM: Altoought there is sound presend, and lfo, cutoff, and all the other pots are working, the sound is non interupted, very loud and at a rather high pitch. voice 6, 5, 4 diode leds are light up, and the sound resemnbles like a few vco beeing active. the other 3 leds, for voice 1, 2, 3 are off. touching the keyboard changes the pitch slighly but then resumes the state before. I'm suspecting the latches: 74ls75 > >>>>>> > >>>>>> QUESTION: how to test the key assigner cpu ? Is there a method simillar to the uC found on KLM 367 ? > >>>>>> > >>>>>> Thanks for support guys. > >>>>>> > >>>>>> Razvan > >>>>>> > >>>>> > >>>>> > >>>>> > >>>>> > >>>>> ------------------------------------ > >>>>> > >>>>> Yahoo! Groups Links > >>>>> > >>>>> > >>>>> > >>>>> > >>>> > >>> > >> > >> > >> > >> > >> [Non-text portions of this message have been removed] > >> > >> > >> > >> ------------------------------------ > >> > >> Yahoo! Groups Links > >> > >> > >> > >> > > > > > > > > [Non-text portions of this message have been removed] > > > > > > > > ------------------------------------ > > > > Yahoo! Groups Links > > > > > > > > >
Message
Re: klm 367 board
2012-12-05 by arpm234