HP8594E cal log and linear amp problem

[higgx]

Hello everybody. I'm calibrating my hp8594e. According to the service manual 2-7 an IF test board(Injector board)(P/N 5062-6421) is Required.

 "A 21.4 MHz signal is injected into an IF test board that has been inserted in place of the first resolution bandwidth assembly, A11. The gain of the A14 log amplifier assembly is adjusted by observing the voltage at the AUX VIDEO OUT on the rear panel with a digital multimeter."

The problem is that I can't find any place to buy this board.
Does anyone know how to cal a14 without using IF test board ?
thanks！！