4 Mar
2015
4 Mar
'15
9:37 p.m.
On Wed, Mar 4, 2015 at 4:23 PM, Stephen Lafferty <steve at tronola.com> wrote:
PS: The revision letter can be found in the lower
right-hand corner of the
DEC schematics that I have.
Note that the schematic revision (CS) and the corresponding etch
revision often do not match. A particular etch can have different
levels of ECO corresponding to different schematic revisions, and a
particular schematic revision might correspond to both an older etch
with ECOs and a newer etc without ECOs (or with fewer ECOs). The
schematic revision is supposed to be stamped on the board or handle,
and updated if ECOs are applied in the field, but they're not always
marked correctly.
The field maintenance print sets often, but not always, have a table
listing the correspondences.