X-Junk-Score: 0 [] X-Cloudmark-Score: 0 [] X-Cloudmark-Analysis: v=2.3 cv=RZTu9Glv c=1 sm=1 tr=0 a=0T96ifFQf8owWxZMDraBOA==:117 a=cGQ7TKBXo2WrFbAEB0ezgg==:17 a=x7bEGLp0ZPQA:10 a=CKeqCrOqW6IA:10 a=nTHF0DUjJn0A:10 a=7jb5Ww02f8w2sx2gJpYA:9 a=CjuIK1q_8ugA:10 a=ALgm5FUbdm2hU8mrnmQA:9 a=n3BslyFRqc0A:10 a=rls1ZAiwvL0A:10 a=o1OHuDzbAAAA:8 a=Ia-xEzejAAAA:8 a=7g1VtSJxAAAA:8 a=1-bpkf2ilQ6NmTeOXMIA:9 a=Qa1je4BO31QA:10 a=gvSQh4r-fQ0A:10 a=5YQ6H4ZxyGn-KoBYtt8s:22 a=Urk15JJjZg1Xo0ryW_k8:22 a=grOzbf7U_OpcSX4AJOnl:22 From: "Stephen Izett stephen.izett@gmail.com" Received: from mail-pl1-f172.google.com ([209.85.214.172] verified) by logan.com (CommuniGate Pro SMTP 6.2.14) with ESMTPS id 405801 for flyrotary@lancaironline.net; Mon, 22 Jun 2020 22:00:22 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.214.172; envelope-from=stephen.izett@gmail.com Received: by mail-pl1-f172.google.com with SMTP id j4so8442817plk.3 for ; Mon, 22 Jun 2020 19:00:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; 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ICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAg ICAgICAgICAgICAgICAgICAgCiAgICAgICAgICAgICAgICAgICAgICAgICAgIAo8P3hwYWNrZXQg ZW5kPSJ3Ij8+DWVuZHN0cmVhbQ1lbmRvYmoNMyAwIG9iag08PC9BdXRob3IoYmh1Z2hlcykvQ3Jl YXRpb25EYXRlKEQ6MjAyMDAxMzAxMDI0MDBaKS9DcmVhdG9yKFBTY3JpcHQ1LmRsbCBWZXJzaW9u IDUuMi4yKS9Nb2REYXRlKEQ6MjAyMDAxMzEwNjU5MDMrMDgnMDAnKS9Qcm9kdWNlcihHUEwgR2hv c3RzY3JpcHQgOC4xNSkvVGl0bGUoUlYxMCBkYXRhLnhscyk+Pg1lbmRvYmoNeHJlZg0KMCA0DQow MDAwMDAwMDAwIDY1NTM1IGYNCjAwMDAwMDU4MDMgMDAwMDAgbg0KMDAwMDAwNTg1NCAwMDAwMCBu DQowMDAwMDA5Mzc1IDAwMDAwIG4NCnRyYWlsZXINPDwvU2l6ZSA0L0lEWzw2NkE1NUFDNzM4RjE2 QTYyOTMyRUU0RUE3RkQ0NDhEQT48NzdFQkY3RTA4RUYxNEE4MUJFOUQ5QjNDMjk5RTA0RTg+XT4+ DXN0YXJ0eHJlZg0xMTYNJSVFT0YN --Apple-Mail=_27096DC8-6892-4280-9C08-0BDD7E3F4A11 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Steve Izett > On 23 Jun 2020, at 9:22 am, Finn Lassen finn.lassen@verizon.net = wrote: >=20 > Just for the record. > > The 1K resistor and the two 2.7V zener diodes are the CAS input = clamping circuit. >=20 > The rest is for redundant +5V to control panel (mixture voltage being = the critical one). > Vcc3 is J2 pin1 (+5V to control panel). > I just used BAX16 diodes because I had them. Any 100mA (16V reverse = voltage or more) diode will do. > LM78L05 flat side down. Left pin is output. Center pin is ground and = right pin is input. >=20 > > If you want to secure components against vibration make sure you use = Natural Cure Sealant (non -acidic)! > I'm using Dowsil 737 RTV sealant. > The auto parts store RTV is acidic and you don't want your circuit = board damaged (etched) by that. >=20 > Finn >=20 > On 6/17/2020 6:57 PM, Finn Lassen finn.lassen@verizon.net wrote: >> In addition to the CAS input clamping circuit, Tracy also recommends = shorting pins 1 and 3 of D18. The voltage drop across the diode to the = PCM module causes slightly lower mixture and program voltage than the = software was programmed for.=20 >>=20 >> However, if you are powering A and B controllers separately (e.g. = separate fuses or busses), I have a better idea.=20 >> 1) Remove the D18 diodes (just below C45 which they feed).=20 >> 2) Add a LM78L05 (or similar) voltage regulator. After each (A and B) = of the power (L1 and L2) input coils (+ on the big C20 and C21 = capacitors) feed the input of the LM78L05 with a diode. Output of it = goes to J2 pin 2 (or + on C45).=20 >>=20 >> Same principle as powering the PCM from either of the 5V regulators = on the EC3 board, but the 0.7V diode drop now happens before the = regulator, not after the 5V.=20 >>=20 >> CAS input clamping circuit:=20 >> 1) A 1K resistor between J2-5 and J2-15 (CAS input and ground).=20 >> 2) Two 2.7V zener diodes in series, arrows or striped ends (anodes) = connected together. The non-striped ends (cathodes) to J2-5 and J2-15 = respectively (CAS input and ground). (Basically in parallel with the 1K = resistor). If you got the polarity of the zener diodes correct you = should see the signal from the CAS sensor clamped to no more than 0.7 + = 2.7 =3D +-3.4 volts on an oscilloscope.=20 >>=20 >> I now have two bad chips (does not respond to reading or programming = attempts -- do "work" in the EC3). The chip pins used to program the = chip go to the Mode switch on the PCM. J2 pins 22 and 24. One might = consider protection diodes for those pins. Oddly the pins continue = working for Mode switch input, just not for re-programming the chip.=20 >>=20 >> The EC3 board was designed for in-circuit chip re-programming (set = mode switch to zero or disconnect J2). Vpp/MasterClear are on J2 pin 11 = (for A) and pin 1 (for B). PGC on pin 22 and PGD on pin 24. However, = Tracy found that the combined capacitance of the programming pins of two = chips made in circuit programming unreliable. I wonder if it might work = if one could control the speed with which it communicates with the chip?=20= >>=20 >> Finn=20 >>=20 >>=20 >> --=20 >> Homepage: http://www.flyrotary.com/=20 >> Archive and UnSub: = http://mail.lancaironline.net:81/lists/flyrotary/List.html=20 >>=20 >=20 >=20 --Apple-Mail=_27096DC8-6892-4280-9C08-0BDD7E3F4A11--