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Modei547A
NOTES
1. Reference designations within this assembly are abbreviated. Add assembly number to abbreviation for
complete description.
2. Unless otherwise indicated:
Resistance in ohms;
Capacitance in farads;
Inductance in henries.
3.
"e''
indicates short lead at component end to be placed on
PC
board.
4. Voltage and current measurements taken under the following conditions:
a. Ambient temperature range 65°F to 85°F.
b. Power supply adjusted to give 5.00 Vdc at Test Point
G) .
c.
Trimmer
R21
adjusted to give
4.00
Vdc at Test Point
@ .
5. If a measured value falls slightly out of the specified range it does not necessarily indicate a malfunction.
However, the area might be suspect if the tracer is not working properly.
6. Single line, double line, and boxed values are used at various points on the schematic to give troubleshoot-
ing data. These values are defined as follows:
a. A single line specification, e.g., 1.4-1.6 Vdc indicates measurement to be made at any setting of
SENSITIVITY control.
b. A double line specification, e.g., 31-35 mA indicates measurement to be made with the sensiti-
27-31 mA
vity control in the most sensitive position for the upper value and the least sensitive position for
lower value.
c. A value shown in a box, e.g., \4.8-5.0 Vdcl indicates measurement is to be made with sufficient
stimulus present to light indicator to full brightness.
7. Numbered points, i.e.
8 ,
on the PC board, designate the signal output of block sections on schematic.
Refer to waveforms. lettered points, i.e.,
© ,
on the PC board. indicate de level points.
8. Circuits marked with shaded overlay, i.e., l®R%iJ%fi®; if grounded, and power supply is not
current-limited, could
result in destruction of Q2, Q3, l1 and CR8.
9. The broken lines, i.e.,----, are feedback paths.
10. Heavy black lines, i . e . , - - - - - indicate path of signal flow.
Page 13
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