Re: [MBZ] Flashing 124 recirc switch light SOLVED!
On Wed, 3 Jan 2007, Jim Cathey wrote: > I tried on a 201 panel. No joy, nor could I use my old > HP 1630D logic analyzer to get anything. The bursts are > too quick, spaced too far apart. Drastically different > time scales, both important to the job. I wonder how well just a "simple" dc504 (tek) in totalize would work? -j.
Re: [MBZ] Flashing 124 recirc switch light SOLVED!
Would these work? http://www.surplussales.com/Meters/MtrImpulse.html Or this one? I envision it in a nice little project box with leads to plug right into the climate control test connector. http://www.skycraftsurplus.com/ index.asp?PageAction=VIEWPROD&ProdID=1001 No, those are all simple counters. I think the correct type of counter has one-shots to determine when it should stop counting pulses (during the dead times) to frame off the digits, and the multiple, possibly multi-digit, codes. I still think it's something that a laptop, or a pda, could do easily, if somebody were interested enough to write a little code. -- Jim
Re: [MBZ] Flashing 124 recirc switch light SOLVED!
A few years back I made an impulse counter with directions and part numbers supplied on one of these lists. IIRC, it worked, but I could not find a code sheet for the SDL. I'll look for it and the instructions, maybe someone could get a use from it. Harry On 1/4/07, Alex Chamberlain <[EMAIL PROTECTED]> wrote: On 1/3/07, Jim Cathey <[EMAIL PROTECTED]> wrote: > > > "impulse counter" - and just what is it counting? Would an > > oscilloscope do as well for manually counting pulses? > > I tried on a 201 panel. No joy, nor could I use my old > HP 1630D logic analyzer to get anything. The bursts are > too quick, spaced too far apart. Drastically different > time scales, both important to the job. > > Mega-sampling via something like a PC parallel port with > simple signal processing might do the job easily, though. Would these work? http://www.surplussales.com/Meters/MtrImpulse.html Or this one? I envision it in a nice little project box with leads to plug right into the climate control test connector. http://www.skycraftsurplus.com/index.asp?PageAction=VIEWPROD&ProdID=1001 Alex Chamberlain '87 300D Turbo '92 Isuzu Trooper ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Flashing 124 recirc switch light SOLVED!
On 1/3/07, Jim Cathey <[EMAIL PROTECTED]> wrote: > "impulse counter" - and just what is it counting? Would an > oscilloscope do as well for manually counting pulses? I tried on a 201 panel. No joy, nor could I use my old HP 1630D logic analyzer to get anything. The bursts are too quick, spaced too far apart. Drastically different time scales, both important to the job. Mega-sampling via something like a PC parallel port with simple signal processing might do the job easily, though. Would these work? http://www.surplussales.com/Meters/MtrImpulse.html Or this one? I envision it in a nice little project box with leads to plug right into the climate control test connector. http://www.skycraftsurplus.com/index.asp?PageAction=VIEWPROD&ProdID=1001 Alex Chamberlain '87 300D Turbo '92 Isuzu Trooper
Re: [MBZ] Flashing 124 recirc switch light SOLVED!
"impulse counter" - and just what is it counting? Would an oscilloscope do as well for manually counting pulses? I tried on a 201 panel. No joy, nor could I use my old HP 1630D logic analyzer to get anything. The bursts are too quick, spaced too far apart. Drastically different time scales, both important to the job. Mega-sampling via something like a PC parallel port with simple signal processing might do the job easily, though. -- Jim
Re: [MBZ] Flashing 124 recirc switch light SOLVED!
On 1/3/07, OK Don <[EMAIL PROTECTED]> wrote: Good find! It "flashes at one Hertz during impulse output." I wonder if the output occurs during the fault condition, or only when using the "impulse counter" to determine the code? My interpretation is the former---the flash alerts you to go hook up the impulse counter to the special terminal behind the battery (somewhere near the Klima relay, I think) and pull the code Where does one get an "impulse counter" - and just what is it counting? Would an oscilloscope do as well for manually counting pulses? I have wondered this as well! It would be nice to get around needing another special M-B tool. I bet Jim C. knows. Alex Chamberlain '87 300D Turbo '92 Isuzu Trooper
Re: [MBZ] Flashing 124 recirc switch light SOLVED!
Good find! It "flashes at one Hertz during impulse output." I wonder if the output occurs during the fault condition, or only when using the "impulse counter" to determine the code? Where does one get an "impulse counter" - and just what is it counting? Would an oscilloscope do as well for manually counting pulses? On 1/2/07, Alex Chamberlain <[EMAIL PROTECTED]> wrote: Somebody (OK Don?) was asking a while back about what the flashing light in the recirc switch on a 300D 2.5 means. Turns out it's not a bug, it's a feature---indicating a stored trouble code in the climate control computer. Check out 83-603.pdf on the FSM CD. Alex Chamberlain -- OK Don, KD5NRO Norman, OK "Even if you're on the right track, you'll get run over if you just sit there." Will Rogers '90 300D, '87 300SDL, '81 240D, '78 450SLC, '97 Ply Grand Voyager
Re: [MBZ] Flashing 124 recirc switch light SOLVED!
I figured it was somthing like that, but I have never had to mess with it. Alex Chamberlain wrote: Somebody (OK Don?) was asking a while back about what the flashing light in the recirc switch on a 300D 2.5 means. Turns out it's not a bug, it's a feature---indicating a stored trouble code in the climate control computer. Check out 83-603.pdf on the FSM CD. Alex Chamberlain '87 300D Turbo '92 Isuzu Trooper ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com -- Kaleb C. Striplin/Claremore, OK (2x) 91 300D 2.5 Turbo, 90 420SEL, 89 560SEL, 87 300SDL, 85 380SE 5.0 Euro, 84 190D 2.2, 81 240D, 76 240D, 76 300D, 72 250C, 69 250 http://www.striplin.net
[MBZ] Flashing 124 recirc switch light SOLVED!
Somebody (OK Don?) was asking a while back about what the flashing light in the recirc switch on a 300D 2.5 means. Turns out it's not a bug, it's a feature---indicating a stored trouble code in the climate control computer. Check out 83-603.pdf on the FSM CD. Alex Chamberlain '87 300D Turbo '92 Isuzu Trooper
