Figure 2. Adjustment locations - top view.

TB-9-6625-1947-35 Test Oscillator Hewlett-Packard Models 654A Manual
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TB 9-6625-1947-35

(8) Rotate FREQUENCY dial fully cw. Frequency counter will indicate between

965 and 970 Hz.

(9) Set FREQUENCY dial for a 1 kHz indication on frequency counter. If dial does

not indicate 1, perform (a) through (c) as listed below:

(a) Remove FREQUENCY dial knob and loosen the four retaining screws.

(b) Slip FREQUENCY dial until 1 is aligned with reference marker.

(c)

Tighten retaining screws and install FREQUENCY dial knob (R).

(10) Set FREQUENCY dial to 10.

(11) Readjust S2C2 and S2C8 (fig. 2) alternately until frequency counter indicates

10 kHz and multimeter indicates -350 mV (R).

(12) Set FREQUENCY RANGE switch to X1M and FREQUENCY dial to 10.

(13) Adjust S2C6 and S2Cl2 (fig. 2) for a frequency counter reading between 10.1

and 10.2 MHz, and A2TP2 (fig. 1) for multimeter reading between -0.38 and -0.40 V (R).

(14) Set FREQUENCY dial to 5. If frequency counter does not indicate between

4.935 and 5.065 MHz, go to (15) below. If (15) below is not performed, proceed to (16) below.

(15) Set FREQUENCY DIAL to 10. If frequency counter indication was high, adjust

A2Cl (fig. 1). If frequency counter reading was low, adjust A2Cl (fig. 1) to lower frequency

counter reading and repeat (12) through (14) above (R).