Elenco Resistor Substitution Box Instrukcja Użytkownika Pobierz pdf (Strona 7)

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r Installation of Knobs without an Ohmmeter

If an ohmmeter is not available, turn both switches

so that the wiper contact is in the position shown in

Figure 5. Start with switch SW1, follow the copper

run on the PC board from the lug in contact with the

wiper to the 470Ω (R7) resistor, to be sure that the

switch is set in the proper position. Align the knob

on the SW1 (Ω) switch to the 470 position, push the

knob onto the shaft. Follow the same procedure for

switch SW2 (KΩ), except follow the copper run to

the 6.8KΩ (R13) resistor. Align the knob on the

SW2 (KΩ) switch to the 6.8 position.

TESTING THE CIRCUIT

SCHEMATIC DIAGRAM

SW1 Ω POSITION

Value Position Meter Reading

10Ω

22Ω

47Ω

100Ω

220Ω

330Ω

470Ω

680Ω

1000Ω

2200Ω

3300Ω

4700Ω

SW2 KΩ POSITION

Value Position Meter Reading

6.8KΩ

10KΩ

22KΩ

33KΩ

47KΩ

68KΩ

100KΩ

220KΩ

330KΩ

470KΩ

680KΩ

1MΩ

Figure 5

Wiper Contact

LugPC Board

The following test is to be made with your meter to determine that the resistors are in their correct circuit

positions. The resistors used in your circuit are gold banded with a tolerance of +

5%. That means that a 10kΩ

resistor could measure between 9,500Ω and 10,500Ω and be correct. Each of the 24 resistance value positions

will be tested and recorded in the chart below.

1 2 3 4 5 6 7 8

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Elenco Resistor Substitution Box Instrukcja Użytkownika Strona 7

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