Agilent Technologies 8590L Service Manual page 273

Troubleshooting the IF Section
Troubleshooting the A15 Motherboard Assembly
Table 5-6 A15 Motherboard Mnemonic Descriptions (Continued)
Mnemonic
HSWP High Sweep
IFA1 IF Attenuation 1
IFA2 IF Attenuation 2
IFA3 IF Attenuation 3
IFA4 IF Attenuation 4
IFA5 IF Attenuation 5
IFG1 IF Gain 1
IFG2 IF Gain 2
IFG3 IF Gain 3
IFG4 IF Gain 4
IFG5 IF Gain 5
IFG6 IF Gain 6
INTERBUS Interbus
IOB0-IOB15 Input/Output Bus
0- Input/Output
Bus 15
LBIO Low Bottom-box
Input/Output
LINE_TRIG Line Trigger
274
Full Name
Provides control for the analyzer display sweep and
retrace. A TTL high starts a sweep and a TTL low
initiates a retrace. This is an open-collector signal.
It should never be driven high.
Control line for 1dB step attenuator on the A12
Amplitude Control assembly.
Control line for the 2 dB step attenuator on the A12
Amplitude Control assembly.
Control line for the 4 dB step attenuator on the A12
Amplitude Control assembly.
Control line for the 8 dB step attenuator on the A12
Amplitude Control assembly.
Control line for the 16 dB step attenuator on the
A12 Amplitude Control assembly.
Control line for the 10 dB step gain on the A12
Amplitude Control assembly.
Control line for the first 20 dB step gain on the A12
Amplitude Control assembly.
Control line for the second 20 dB step gain on the
A12 Amplitude Control assembly.
Temperature-compensated control line for the 10 dB
linear gain on the A14 Log Amplifier assembly.
Temperature-compensated control line for the 10 dB
linear gain on the A14 Log Amplifier assembly.
Temperature-compensated control line for the 20 dB
linear gain on the A14 Log Amplifier assembly.
A communication line between the four slots in the
card cage. It coordinates functions between options
when more than one option is installed in the card
cage.
Input/Output (IO) data lines used between the A16
Processor/Video assembly and related assemblies.
Strobe line for Input/Output (IO) data transfers.
Provides a TTL signal at the power-line frequency
rate. It enables the line-trigger mode on the A16
Processor/Video assembly.
Description
Chapter 5