measurement and converts it into a digital
32-bits wordwhichisleadtopcb
Pcb MACU2A includes a Wall-sensor, which
indicates the "home position" of the carriage.
cb MACU2A receives 8-channds (A-M)
349-084 Schematic diagram
349-08-P Component layout
lnsrmctions are given in chapter "TESTING
AND ADSUSTING".
None
1.
DETU
Light detectors V1-V8 (Hamamatsu S1227-
)
are connected to component assembly
DETU.
Current from the detectors are
converted into voltage
by
amplifiers Dl and
D2
(LF444).
Each detector have an inverting amplifier,
which upper frequency limit
4,8
kHz
is
determined
by
capacitors Cl-C8 (33 pF) and
resistors
R1-R8
(IM).
ANALOGICAL
Signals
Prom
circuits
Dl
and
D%
are lead
to
circuitD3 (analogical multiplexerLF 13508),
where the detector is chosen
(1
of 8). Choice
is
determined by bits AO-A2, which are lead
from pcb MWSCU2A via connector
XI.
ignal from the multiplexer is lead to adigital
adjustable amplifier formed
by
D/A converter
B5
(AD9533), inverting amplifier D4
(kF441), aansistorV10 (BG337) and resistor
R17 (10K).
Three upper bits GO43 from the
D/A
converter are used to adjustment.
~ompcbMWSCU%AviaconnectorX1
to
the
D/A
converter. Naxmin gain is 8.
Upper frequency limit of circuit
D4
is 4OkUz
(RlO
=
182K, G31
=
22pF). Trimmer
R12
(IOOK) is used for offset adjustment.
Document Release Section Page
3511352-100-X
2.0
3
7
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