HP 8560E - Figure 2-13 TAM Connector Pin Locations; Procedure

92 Chapter2
Adjustment Procedures
8. First LO Distribution Amplifier Adjustment
Procedure
1. Press LINE to turn the spectrum analyzer off and disconnect the line
cord. Remove the cover and fold down the A15 RF and A14
Frequency Control assemblies.
2. Move the jumper on A2J12 from the WR PROT to the WR ENA
position. The jumper is on the edge of the A2 board assembly and
can be moved without folding the board down.
3. Reconnect the line cord and turn on the spectrum analyzer.
4. Set the HP 8560E/EC controls as follows:
Center frequency ...................................... 1.45 GHz
Span ............................................................. 0 Hz
5. On the HP 8560E/EC, press
CAL, MORE 1 OF 2, SERVICE CAL
DATA, LO LEVELS, and INT LO LEVEL.
6. Use the knob or key pad to enter the value 32. This sets the LO
power to a low level.
7. To set the gate bias, connect the positive lead of the DVM to A14J18
pin 15 and the negative lead to A14J18 pin 6. See Figure 2-13 on
page 92 for a pin location drawing.
Figure 2-13 TAM Connector Pin Locations
8. On the HP 8560E/EC, press
LO GATE LEVEL.
9. Note the Gate Bias voltage printed on the A7 LO distribution amp
label. Use the knob or keypad to change the displayed DAC value so
the DVM reading is equal to the label voltage, ±10 mV.
10.To set the low band sense voltage, connect the positive lead of the
DVM to A14J18 pin 13 and the negative lead to A14J18 pin 6.
11.On the HP 8560E/EC press INT LO LEVEL. The message DRIVE FOR
BAND# 0 will be displayed.
12.Note the Sense voltage printed on the A7 LO distribution amp label.
Use the knob or keypad, and press enter, to change the displayed
DAC value so the DVM reading is equal to the label voltage, ±5 mV.
13.Record the DAC value: