UBI EasyCoder 601 XP – Service Manual Ed. 1
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Chapter 15 CPU Board
Electronic Key Circuit (P34), cont'd.
Since the communication between the RISC processor and the key
circuit is comparatively slow, the content of the key circuit is copied
to DRAM at startup and used from there. At power off, the content
is read back to the key circuit, provided there is time enough. Thus,
there is a small risk that new data may be lost, before it has been
saved back to the key circuit. The original data in the key circuit will
not be damaged, if the read-back process should fail.
Slave Processor (IC305)
The slave processor contains an A/D converter and controls the
RTC interface, and the bar code wand interface (also see chapter
15.4).
RS 232 Driver (IC304)
The RS 232C driver circuit is socket-mounted to allow replacement
if damaged. Part No. 1-956016-00.
LTS Emitter Strap (P55)
This strap decides the intensity level of the label-taken sensor (LTS)
emitter (also see chapter 10):
Jumper fitted:
High intensity
No Jumper:
Low intensity
LTS Potentiometer (WR51)
This potentiometer decides the sensitivity of the receiver in the
label-taken sensor (also see chapter 10).
Ribbon End Sensor Strap (P56)
This strap decides the intensity level of the ribbon end sensor emitter
(also see chapter 7.4):
Jumper fitted:
High intensity
No Jumper:
Low intensity
Ribbon End Potentiometer (WR52)
This potentiometer decides the sensitivity of the receiver in the
ribbon end sensor (also see chapter 7.4).
Debug Strap (P13)
This strap is used for debugging and program development and
must always be fitted with a jumper during normal operation.
15.2 Circuits and
Straps,
cont'd.
