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8. PARTS LIST AND CIRCUIT
DIAGFIAMS
8-1.
8.2.
8.3.
8.4.
8.5.
8.6.
Numbering
An identif ication number bet+7een
207
and
303
is assigned to
each module. The designation of a component or terminal incl.udes
this nulber as a pref ix - e]canple:
207R3 (resistor R3 on mdule
207 ), or 207-12 (temiaal No.12 oa module.
207 ).
Switches
Switches with stops are §houn in the extreme anticlockwise position.
the BANI) switch is shorn in the BANI) K position.
Switch wafer No. 1 is the wafer nearest to the front panel, and
the front side of a wafer is the side facing the froat panel.
Terminals
Locat:ions of teminals appear from the component location drawings.
On the circuit diagrams, each terminal is identified by a number
and in nose cases by all explanatory text. In addition to this, the
number of tbe nodule and [erninal Co which the lead is connected
is indicated (exanple:
244 -12). trhere ititerconnections consist
of coaxial cableg only the nuihber of the teminal i6 given to which
the inner conductor of the cat}le is cormected.
Voltages
Typical DC voltages are indicated on the circuit diagrams next to
the points ta which they refer and are marked with a "V''.
Typical logic levels are indicated in a bracket (LOW/HIGH) on the
circuit diagrans riexc to the point to which they refer and are narked
uich a ''v''.
Typical AC voltages are likewise indicated oti the circuit diagrams.
They are narked vich "Vpp" or "nvpp`'.
For meaguring conditiot)a See Chapt:er 7,
Test Points
Location of test points is shorn on the conponeat locatiotl dravitlgs.
Typical voltage ac each test point is indicated on the circuit dia-
8ran.
bolE
1anacioh
8.6.1.
Logic circuits:
A smll circle at an external input meaa8 Chat tbe gpecific iapuc
is active LOW, i.e. it produces the desired function in coajunccion
with other inputs if its voltage is the lover of the two logic le-
vels in the system; otherwise the specif ic itlput is HIGH
8-1
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