Table 72. Voltage Measurements

11-6625-255-14/T0

33A1-13-170-1

Table 72. Voltage Measurements

Point of measurement

Normal indication

Isolating procedure

Pin 3 of V8. (fig. 7-6)

+430 volts dc.

If a close reading is not obtained, check V7C, C17 and C37, R84 and

R85, and L1.

Junction of C18D (C38C) and R68. (fig.

+230

volts dc.

If a close reading is not obtained, check C18D and R67,

Junction of R51 and C18B, (fig. 7-6)

+320 volts dc.

If a close reading is not obtained, check C17C, C17D, (C38C),

C18B, R49, R50, and R51.

Pin 8 of V8. (fig. 7-6)

+225 volts dc.

If the indication varies by more than a few volts, adjust R43. If

adjustment of R43 does not correct the reading, check V8, V9,

and V10 and associated circuit components.

7-3. Dc Resistance of Transformers and Coils

a n d resistance checks (figs. 77 and 7-8).

b. Do not use the resistance measurements as

The dc resistance data (table 73 below) is provided

the sole basis for discarding a transformer or coil

as an aid to troubleshooting (sec II). When using the

as defective. Because of rather broad winding

data, observe the following:

tolerances during manufacture, resistance may

a. Before making resistance measurements of the

vary from one transformer or coil to another. The

windings, check to see if abnormal operation is due to

values given in the table are average values. The

a faulty transformer or coil: follow the trouble-

shooting procedures (table 74) and make voltage

Figure 7-1. Spectrum Analyzer TS723A/U chassis,

top view, location of parts.

7-2

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