HP 8559A Operation And Service Manual page 208

5-25. FIRST CONVERTER ADJUSTMENTS (SERIAL PREFIX 2236A) (Cont'd)
Connect frequency counter to analyzer
Jumper A16TP1 DIODE BIAS to Ground. A16TP1 is located on the Motherboard through a hole in the
analyzer side frame.
Adjust front-panel TUNING control for DVM indication of 0.000 Vdc (fully counterclockwise).
Adjust A7R74 3 GHz for frequency counter indication of 3.000 GHz
be achieved, selectable resistor A7R94* can be changed to provide the proper range necessary.
Adjust front-panel TUNING control for DVM indication of - 10.000 Vdc.
Set A7R95 6 GHz F (fine) to approximately midrange (R95 is a 20-turn potentiometer).
Adjust A8R28 6 GHz C (coarse) for a frequency counter indication of 6.000 GHz
Retune front-panel TUNING control for 0.000 Vdc DVM indication and readjust A7R74 3 GHz if neces-
sary for frequency counter indication of 3.000 GHz
Lightly tap the top edge of the A7 Frequency Control board with the handle of a small screwdriver to seat
controls.
Adjust A7R95 6 GHz F (fine) for frequency counter indication of 6.000 GHz
Alternate IF First LO Shift Check
15. Press front-panel ALT IF pushbutton IN to activate alternate IE
Verify YTO frequency shift according to the following table.
FREQUENCY BAND GHz
1 (.Ol-3)
1 (-01-3)
2 (6- 9)
3 (3- 9)
4 (9-15)
5 (6-15)
6 (12.1- 21)
17. Remove jumper from A16TP1 DIODE BIAS to Ground.
ADJUSTMENTS
Input.
1 MHz.
TABLE FIRST LO SHIFT CHECK
FREQUENCY COUNTER INDICATION
ALT IF
Reference (6.000 GHz)
O F F
Reference -1 5 MHz
ON
Reference t15 MHz
ON
ON Reference - 7 . 5 MHz k400 kHz
Reference
ON
Reference - 5 MHz
ON
ON Reference
1 MHz. If this adjustment cannot
2 MHz.
1 MHz.
MHz k300 kHz