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CASSETTE INTERFACE (CONT.)
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POSSIBLE CAUSES OF TAPE TRANSFER ERRORS
If errors are found during the play or check process, the display will
read "ERROR IN DATA". If this happens, one of the following reasons
might be responsible:
A) The playback volume is too high or too low. Some trial and
error may be required. Generally the best level is as high as
possible before distortion occurs (approximately 3/4 of the way
up). If the playback volume is very low, the DMX will not
acknowledge the data at all.
B) The leader tone is too short. At least three seconds of the
"leader" tone must come between pressing PLAY and the rough sound
of the memory information.
C) The tone control may be set improperly. It is important that
the tone control(s) be set so that neither the high nor the low
frequencies are attenuated.
D) Some cassette recorders invert the phase of the signal in the
process of recording and playing back. If your cassette recorder
NEVER checks or plays data properly, the inverted phase may be the
problem. The software version 2.10 (released in June 1982) enables
inverted data to be read properly by the DMX Cassette Interface.
To set the DMX to read inverted data, hold the "0" button while
pressing CHECK or PLAY. The first digit of the display will show a
"!", indicating that the DMX is expecting inverted data.
E) The playback head azimuth of the tape recorder may be out of
alignment. This will only affect recordings made on other tape
recorders.
F) Tapes recorded on older DMX's (software version 1.00) will not
play on newer units and vice versa (see DMX SOFTWARE REVISIONS,
next page).
G) The Batteries in the cassette machine are too weak.
H) There is a bad spot on the tape.
I) Sometimes tape errors are caused by poor recordings. Set the
recording level manually if possible, and use a LINE or AUX input
if available.
The Cassette Interface is designed to work with portable cassette
recorders having an "Earphone", "Speaker", or "Monitor" output. The
Interface is not designed to work with tape recorders having only a line
level output.
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