KA01 and resistor R2



I bought this kit and when going to assemble the parts I see the following error:

Among the components received is a resistance of 68 ohm, which has a very low value compared to the others.

On page 6 of the manual it is indicated that resistance R2 is 68 ohm, but on page 8, in which the complete circuit diagram is shown, it is indicated that R1 = 1,000 ohm, R2 = 390 ohm and R3 = 180 ohm.

Can you tell me what is the correct value of R2?