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Old 04-18-2000, 06:03 PM
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Join Date: Mar 2000
Location: Southampton, NJ
Posts: 126
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

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Old 04-18-2000, 08:51 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
Replacement of the known faulty components and related parts. Then a bench test. Most of the time it is the IC chips that fail.

Donnie Drummonds
1992 500E (very soon I hope
1981 280GE SWB
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Old 04-18-2000, 09:23 PM
Join Date: Jan 2000
Location: Maryland. USA
Posts: 180
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.


S, J.R. Brown
1986 280GE LWB Anthracite
1980 450SEL Champange
1981 Volvo 240DL UPS Brown
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Old 04-18-2000, 09:25 PM
Join Date: Jan 2000
Location: Maryland. USA
Posts: 180
Whoops! My parts where for up through 1980. Don't know about 1985.

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Old 04-19-2000, 02:25 PM
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Join Date: Aug 1999
Location: Saint Helena, CA
Posts: 166
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.


'78 300D

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