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-   -   What is a rebuilt cruise control module consist of? (http://www.peachparts.com/shopforum/tech-help/7167-what-rebuilt-cruise-control-module-consist.html)

zachv 04-18-2000 07:03 PM

I am having my father(electrical engineer) take apart the cruise module and check all conections, but I am wondering what a rebuild actually consists of. Thanks for the help.

Zach V.
'85 300D

Benzmac 04-18-2000 09:51 PM

Replacement of the known faulty components and related parts. Then a bench test. Most of the time it is the IC chips that fail.

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Benzmac:
Donnie Drummonds
1992 500E (very soon I hope :)
1981 280GE SWB
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM

JRBrown 04-18-2000 10:23 PM

I've come across a couple of DITY techniques:

1. resolder all connections using a high grade electronics flux and then clean using deionized water and use compressed air to blow dry.

2. Replace the LM-2901 comparator chip and the DUAL gate N-channel FET. Both are available at Radio Shack.

3. Buy a rebuild from this board (that's my choice).

Best of Luck. And let us know how it works out. and what you all found.

J.R.

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S, J.R. Brown
1986 280GE LWB Anthracite
1980 450SEL Champange
1981 Volvo 240DL UPS Brown

JRBrown 04-18-2000 10:25 PM

Whoops! My parts where for up through 1980. Don't know about 1985.
Sorry.

J.R.

Luke 04-19-2000 03:25 PM

The cruise control for the '85 (and I think back to '81) uses a digital counter scheme. I am not familiar with the particulars, but I have seen the innards, and am sure of that much, judging by the parts used, etc... My original post a couple of months ago dealt with the earlier analog version, as found on my '78 and others. It uses an LM-2901, and a Cap/FET for storage of the set speed. The "newer" version probably uses TTL and a flip flop to store the set speed as a digital number. If your dad is over 35 years old, it may bring back waves of collegiate nostalgia. Good luck.

Luke

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'78 300D


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