Agilent Technologies 4284A Service Manual page 85

Softkey
f1: ' A u t o '
Used to check all groups, and to isolate the faulty board. T h e checking
order is shown in Figure 3-13.
f2: ' P o w e r '
Used to check the power supply group, and to isolate the faulty board in
the power supply group. T h e items checked in the power supply group
are as follows:
• C o o l i n g fan
• O u t p u t dc voltages on the Al board
• N e o n lump on the A13 board
• F u s e s on the Al board
• V O LTA G E SELECTOR switch and Fuse on the rear panel
f3: 'Digital' Used to check the digital group (A7, A20 to A50), and to isolate the faulty
board in the digital group. T h e items checked in the digital group are as
follows:
• P o w e r -on self test
• E a c h performance test for each digital interface
f4: 'Source'
Used to check the source group (A4, A5), and to isolate the faulty board in
the source group. The items checked in the source group are as follows:
• T e s t frequency test
• S i g n a l level/Level monitor test
• D C bias level test
f5: ` V R D '
Used to check the A6 Vector Ratio Detector (VRD). T h e items checked in
the VRD are as follows:
• H p o t Buffer (A3)
• A -D Converter
f6: ` T R D ' Used to check the transducer (TRD), and isolate the faulty board in the
TRD (A2, A3). The items checked in the TRD are as follows:
f8: ' E x i t '
Used to exit this program.
Table 3-14. Main Menu Softkeys
Description
• P r o s e s s amplifier and phase sensitive detector
• 9 0 ° phase shifter on A2
• U N B A L detector on A2
• H p o t buffer on A3
• MODEM/Normalizer on A2
• L c u r gain amplifier on A3
• R a n g e resistor/I sense amplifier on A3
• I -V converter on A3
• B i a s Current Isolation (Active Indactor) on A3
3-42