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1.2.3
Pre-Patch Panel Insertion and Removal
To insert the pre-patch panel, align the lugs on the bottom of the pre-patch
panel frame with the slots in the bottom rail of the patch bay (Figure 1.6).
Push the pre-patch panel forward until the lugs on the top of the frame mate
with the slots on the top rail of the patch bay.
Gently slide the pre-patch
panel slightly to the right.
Depress the ENG switch.
(The computer auto-
matically goes into the set pot mode when the ENG switch is depressed.)
The
patch panel drive system faces the pre-patch panel to the right into the locked
position.
Depressing the DIS pushbutton disengages the locking system and forces the pre-
patch panel to the left for removal.
1.2.4
Amplifier Balance
'For accurate computation, the operational amplifier must remain balanced.
The
amplifier must produce a zero output voltage when the combined effects of the
input voltages or the absence of input voltages demand it.
With this ,require-
ment in mind, the amplifiers contain chopper stabilization circuits to minimize
the effect of component drift.
Under normal circumstances, the amplifiers do
not require balancing for several weeks.
However, it is desirable to check
this condition periodically; if an amplifier is found to be unbalanced, an
adjustment is required.
The amplifier balance is checked as follows:
1.2.5
1.
Allow a warm-up of 15 to 30 minutes.
Place the voltmeter
FUNCTION switch in the ABAL position and depress the SP
pushbutton of the MODE switch.
2.
Use the signal selector system to connect the stabilizer
output of each amplifier to the voltmeter.
Select AOO and
proceed in order.
In each case, the voltmeter should reg-
ister a deflection that is less than 1/2. division on the
meter scale.
3.
If an amplifier causes a larger deflection, the amplifier
should be balanced.
The balance controls for amplifiers are
located behind the pre-patch panel on the front block of the
amplifiers (Figure 1.7).
Adjust these controls for a zero
reading on the voltmeter.
Changing Computational Components
In the solution of some problems, it may be necessary to add a computing com-
ponent to the existing complement.
Since some of the module positions are de-
signed to handle more than one type of computing component, a component not
required in the problem investigation may be removed and another unit inserted
in its place.
Figure 1.8 illustrates the various positions of the computing
component in the 580 field area.
The diagram shows which type of computing
component is compatible with each position.
The procedure for replacing a
computing component and changing the pre-patch panel patching block is described
in the following paragraphs.
1-7
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