D424 MO Recorder
Date printed: 06.03.02
SW V 1.6
D424 - Circuits E6/3
6.1.4
Desktop Controller
The Desktop Controller 68HC11 (IC61) communicates via the serial SCI
interface with the main processor. It is responsible for the keyboard scan-
ning and the different displays. It boots with an internal boot routine and
subsequently – if required – loads the main program from the 68368 via
the SCSI interface to the RAM which is buffered by a high-capacity elec-
trolytic.
6.1.5
Power Supply
In order to bridge comparatively long power interruptions two large ca-
pacitors (C119, 141) are connected in parallel to the 24 VDC. From this
voltage the +5 V for the logic, the +12 V for the MO drive and ±14 V for
the analog circuits are derived. The ±14 V are electrically separated from
the digital supply. These switched-mode regulators are clocked with twice
the sampling rate. The switching thresholds at the 24 V input for the
power-down signal and the power-on threshold are detected by IC18. RA1
is used to adjust the ±14 V supply.
For the fluorescent display, 4 V
AC
and 50 V
DC
are generated by T10. The
different auxiliary voltages for A/D and D/A converters etc. are regulated
on-board on the corresponding assemblies.
6.1.6
Jumper and DIP Switch Settings
1. Supply Voltage on the Parallel Remote Connector (Pin11):
24 V/max. 300 mA if JP1 and JP2 are linked
5 V/max. 700 mA if JP2 and JP3 are linked
2. Supply Voltage on the Serial Remote Connector (Pin9):
24 V if JP4 and JP5 are linked
n.c. if JP5 and JP6 are linked
3. DIP Switch (DS1)
1
off
Spare
2
off
Spare
3
on
Spare
4
on
Baud rate (off position used for factory tests only)
Содержание D424
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