EG&G ORTEC 414A Manuale operativo e di servizio - Pagina 12

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must be disconnected from its position in any system, and
routine diagnostic analysis performed with a test pulse
generator and oscilloscope. It is imperative that testing not
be performed with a source and detector until the amplifier
and logic inputs to the Fast Coincidence unit perform
satisfactorily with the test pulse generator.
The testing instructions in Section 6.1 of this manual and
the circuit description
in
Section 5 should
provide
assistance in locating the region of trouble and in repairing
the malfunction. The guide plate and shield cover can be
completely
removed
from
the
module
to
enable
oscilloscope and voltmeter observations with a minimal
chance of accidentally short-circuiting portions of the
etched board.
The 414A may be returned to ORTEC for repair service at
nominal cost. Our standardized procedure requires that
each repaired instrument receive the same extensive quality
control tests that a new instrument receives. Contact our
Customer
Service
Department, (615) 4824411, for
shipping instructions before returning the instrument.
6.4. TABULATED TEST POINT VOLTAGES
ON ETCHED BOARD
The following voltages are intended to indicate the typical
dc voltages measured on the etched circuit board. The
voltages given here should not be considered as absolute
values, but should be used as an aid in troubleshooting. All
voltages were measured from ground with VTVM having
input impedances of 10
or greater. Voltages are dc
values with no input pulses. Set Resolving Time control to
100 divisions.
Table 6.1. Typical dc Voltages
Test Point
Voltage
Test Point
Voltage
QIC
7.4
Ql4c
1.2
Q2c
1.2
013c
3.8
Q3c
3.8
011c
15.4
019c
7.4
07c
12.0
QiSc
1.2
010b
8.1
Ql7c
3.8
O20e
5.5
Ql5c
7.4
022e
0.9