It is our experience here in the Compton service facility that the vast majority of DG-1 problems are not component failure, but cold solder connections on the digital circuit board X54-1160-00.
The second most frequent problem is dirty Molex connectors between the two circuit boards in the DG-1.
Recommended service procedure:
Remove both boards. Using a fine point, low wattage iron (45 or less), and a good quality low flux content solder, carefully resolder all component side connections plus the print throughs containing no components. (There are 18 of these points-only one is not accessible from the top, but is located under IC11 and can be resoldered from the bottom.) Resolder the Molex connectors. There are 9 print-thru's where solder may not have flowed thru to the component side.
Using a good quality tuner cleaner with silicone lubricant, spray both boards Molex connectors and work the pins in and out 3 or 4 times to insure good contact. Rassemble and final check.
Total time on the bench: 20 minutes. We will allow up to 1 hour only if in warranty.
JEB:adr
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