Nine of ten buyers inspecting a used Heidelberg Speedmaster SM102 or CD102 crawl into the cylinders to read the lines and rock the gears for sound, then wave off the CPC ink remote control — the very thing that decides how fast the press gets up to colour. A lit screen proves nothing: the console generation, whether all thirty-two zones still move, and how accurate the presets are, are the bills you pay every day after you take it home. Every Speedmaster unit is divided into thirty-two ink zones, each driven by a small motor with a feedback potentiometer that turns the fountain blade.
- Check the generation first: the CPC1-02 appeared on the Speedmaster M in 1984 and by the CPC1-04 it networked with plate scanners; at Drupa 1995 Heidelberg launched the CP2000 centre console, folding ink control, plate reading and colour measurement into one touchscreen.
- Generation must match machine age: a console that doesn't fit the press age usually means a built-up or swapped unit — clear the provenance before you talk price.
- Schematics are dated monthly: the SM102 CPC1-04 set splits into two windows (1998.11–2000.11 and 2000.11–2002.05) and the CD102 has its own 1999 edition; later CP2000 schematics are split just as finely (1999.01.18, 2002.10.01, 2003.04.01 breakpoints), so boards must match the revision.
- The zone motors wear out: a worn potentiometer track drifts the preset, a sticking brush freezes a zone, and backlash in the worm lets the number and the gap disagree.
- Ask where presets come from: scanned at the plate reader or fed straight from prepress CIP3 data decides whether you can reproduce them yourself.
Why it earns its keep: a row of micro-motors in the ink fountain
The core of CPC is a line of small motors behind the thirty-two zones of each unit: the console sends a number, the motor turns the blade to open or close the gap, and a feedback potentiometer reports the actual opening back. By the 1994 CPC1-04 it could already take plate-scanner coverage and turn it into presets, and make-ready paper and time came down. The 1995 CP2000 went further, folding ink remote, plate reading and measurement into one screen and even eating prepress CIP3 data directly. Thirty-two independently closed-loop zones are exactly where a used press shows whether its mechanics and electronics still agree.
Three steps to force the CPC out of hiding
First, run a plus/minus step test on every zone and watch for instant response and odd noise — any zone that lags flags a motor or drive fault. Second, spot-check zones against the actual fountain gap; a wide gap means blade or potentiometer wear. Third, pull out the on-board schematics and check the revision against the build date — a mismatched console turns every later fault-find into a dead end. Pass all three and the ink control has truly been tested.
Conclusion: Half the price gap on a used Speedmaster hides in the ink control. A hard console generation, a matching schematic revision and live zone action make a press worth restarting; sign on a lit screen alone and you will pay in wasted sheets every day.
