Hi,
How to determine the pin number of an IC:
e.g. DIL-8 case:
8 7 6 5
+|-|-|-|+
notch: > |
+|-|-|-|+
1 2 3 4
^
pin no. one
I hope this helps ...
ciscomanvann wrote:
> OK, when I am looking at the IC how do i know which pin is pin 1? I
> found one pin on IC12 that measures +/- 4.7 v but no pin that changes
> on IC13. Hmm
>
> --- In PolySix@yahoogroups.com, Johannes Hausensteiner <jo.synth@c...>
> wrote:
>
>>On KLM-367 check the following:
>>∗ IC12 (TL072) pin1: must be -5V .. +5V according to PW/PWM poti
>> if not, replace IC12
>>∗ IC13 (4558) pin1: must be -5V .. +5V according to PWM SPEED poti
>> if not, replace IC13
>>∗ Set PWM SPEED to slowest and check IC1 (4066)/pin9: must change from
>> minus to plus voltage and back (I dont know the exact values; will
>> be at least -3V..+3V)
>> if not, replace IC20 (LM13600) and/or IC15 (4558)
>>∗ IC1/pin6: must be +5V when WAVEFORM is at PWM position, otherwise 0V.
>> if not, replace IC3 (LM339)
>>∗ IC1/pin8: must be the same as IC1/pin9 when WAVEFORM is at PWM
>> position, if not replace IC1 (4066).
>>∗ TP1 (PW/PWM) near IC12: according to service manual "PW/PWM check
>> and adjustment"
>> if not OK, replace IC20 (LM13600) and/or IC15 (4558)
>>
>>I hope this helps,
>>
>>Johannes
>>
>>
>>ciscomanvann wrote:
>>
>>>Nothing happens. It plays, but the width or pwm does not change. I
>>>have a multimeter, how do i check this stuff out? I dont know a whole
>>>lot about ICs.
>>>
>>>--- In PolySix@yahoogroups.com, The Old Crow <oldcrow@o...> wrote:
>>>
>>>
>>>> First thing to do is set VCO to PW and move the width knob from 0
>>>
>>>to 10
>>>
>>>
>>>>and back to 0 and listen to see if it changes accordingly. Then
>>>
>>>set it to
>>>
>>>
>>>>10 and change the VCO mode to PWM and move the PWM speed knob from
>>>
>>>0 to 10
>>>
>>>
>>>>slowly and note if the cyclic modulation is audible.
>>>>
>>>> If nothing is working then I would imagine either IC20 (LM13600)
>>>
>>>needs
>>>
>>>
>>>>replaced, or the analog switch section IC1C died and IC1 needs
>>>
>>>replaced,
>>>
>>>
>>>>or perhaps the control voltages off deMUX IC19 aren't getting there
>>>
>>>and
>>>
>>>
>>>>IC19, IC12 or IC13 is to blame (least likely though).
>>>>
>>>> Use my schematic as it is much easier to read than the old
>>>
>>>service
>>>
>>>
>>>>manual copy. PWM circuit is on the far right, about 2/3 of the way
>>>
>>>down.
>>>
>>>
>>>>It is marked "PWM MG":
>>>>
>>>>
>>>
>>>http://www.oldcrows.net/~oldcrow/synth/korg/polysix/crowlm367/klm367a_
>>>eagle_schem.gif
>>>
>>>
>>>> Hope this helps,
>>>>
>>>>Crow
>>>>/∗∗/
>>>>
>>>>On Wed, 31 Dec 2003, ciscomanvann wrote:
>>>>
>>>>
>>>>
>>>>>I know this sounds stupid, but how can i tell if the PWM is
>>>
>>>working?
>>>
>>>
>>>>>If it is not, where do I start looking to fix it?
>>>>>Thanks!
>>>
>>>
>>>
>>>PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
>>>
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>>>
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>>>
>>>
>>>
>
>
>
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>
>