10. Set the HP 8560A to the following settings:

CENTER FREQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .300 MHz SPAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..lOOMHz

11.If the 1st LO is present, a signal should be displayed at about -10 dBm (approximately f20 MHz from the center frequency). If no signal is displayed and ERR 334 LO AMPL is not present, troubleshoot the A7 LODA. If no signal is displayed and ERR 334 LO AMPL is present, check the All YTO as follows:

Set jumper A14J23 to the TEST position. Set the HP 8560A to the following settings:

C E N T E R F R E Q . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 Hz CF STEP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..300MHz SPAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 Hz

Connect a power meter directly to the output of the All YTO.

Press the HP 8560A’s step-up key and measure the YTO output power at each step. Check that All YTO’s output power is between f9 and +13 dBm.

Set jumper A14J23 to the NORM position and reconnect the All YTO.

12.On the HP 8560A press (-1, ICAL), MORE, FREQ DIAGNOSE, and MAIN ROLLER. Note the Main-Roller Oscillator’s frequency.

Main-Roller Oscillator’s Frequency =

M Hz

 

 

13.Disconnect W32 from A14J501 and connect the output of a signal source to A14J501. Connect a DVM’s positive lead to A14J17 pin 1 and negative lead to A14J17 pin 6. See Figure lo-1.

14.Set the signal source to the following settings:

Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..0 dBm Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Frequency recorded in step 12

15.Tune the source 1 MHz below the Main Roller frequency. The voltage measured on the DVM should be approximately 8.2 Vdc.

16.Tune the source 1 MHz above the Main Roller frequency. The voltage measured on the DVM should be approximately -8.2 Vdc.

17.If the DVM reading does not change, the Al4 Frequency Control assembly is defective. Reconnect W32 to A14J501.

10-4 Synthesizer Section