Technical data
NOTE: From this point, the problem is probably one of the
remaining instruments; the 85102, sources, test heads,
the mm-wave controller or their interfaces.
You can use the 8510XF, power-up self tests, running
error messages, a1, a2, b1, and b2 raw channel displays,
troubleshooting LED's, and passed installation data and
displays to help pinpoint the problem to an instrument.
But, with the diagnostic aids that are now available for the
8510XF, the quickest way to isolate a problem to an
instrument is using the technique of instrument sub-
stitution using the diagnostic aids as follows:
To prove that the 85102 is OK, run the built-in 85102
IF/Detector Service Program Number 2. This verifies that
the 85102 is good to an 80% confidence level. It takes
less than a minute to run and pinpoint failures to a board.
If all four channels fail the Unratioed Power Level Tests,
the most likely causes are a failure in the RF or LO Sources
signal going to the Controller test head and associated
cables that effect all four channels (see LO path and RF path).
A Power Supply can also cause these paths to fail.
Remove the GPIB and RF power cables from the 8510XF
system to isolate the sources. Refer to the appropriate source
manual to troubleshoot the 83651B and 83621B. For
8360 series sources use the front panel emulator
08510-60022.
NOTE: Do not try to measure the RF source power in source
#1 in the 8510XF system by disconnecting the RF cable.
Measuring the RF from the source breaks the leveling loop
and causes the source to supply maximum power output.
Instead, try placing a coupler in the RF cable path and
measure the power that way. Consider substituting known
good sources and cables for the suspected sources, if they
are available.
If One, Two, or Three Channels Fail the Unratioed Power Tests.
If the power levels on at least one but not all of the four
channels fail, the most likely cause of failure is the test head
or mm-wave Controller. See E7342A/52A manual for
service procedures for they are manual procedures and can-
not be abbreviated here.
Below describes how test set manual works for the
8510XF. To help narrow the problem to the faulty instrument,
the service adapter and service tools are used to emulate the
operation of the source and test set and check unratioed
power levels into the 85102 IF/Detector.
Run the Service Program using the Test Set GPIB commands
tests. These tests can find approximately 15% of all
E7342A/52A mm-wave Controller failures and requires about
one minute to complete. The digital functionality of the mm-
wave Controller is checked with this test, not the RF paths.
Finally, use the failed unratioed power test to find the bad
path/paths and assembly.
NOTE: Do not perform Test number 5 "Increment Active
Attenuator" in the "Test Set GPIB Commands" menu. The
mm-wave Controller does not contain any attenuators.
(20 minute test)
To prove that the E7342A/52A Millimeter Sub-Systems
are at fault use the part number 85102-60210 5-way
power splitter. This substitutes for the mm-wave controller
test heads and sources and proves whether they are at fault.
Also run the 8510C Service Program Menu number 3.
Finally, perform the RF Source built-in diagnostics and the
E7342A/52A un-ratioed power troubleshooting. Refer
to the Operator's Check , and perform this check to
troubleshoot the un-ratioed power levels. This tests the
RF Sources mm-wave controller and test heads. This
verifies that the RF Source, mm-wave controller and test
heads are operating to a 90% confidence level.
CPU Board Tests (A5) 1
I/O Board and Front Panel Tests (A1, A2, A7) 2
Display Board and CRT Tests (A4, A11) 3
Non-Volatile Memory Board Tests (A6) 4
Return to 8510 Service Program Menu F [,]
85101 Display/Processor
Service Program Menu
1 A5 Processor Eprom
2 A5 Processor Ram
3 A7 Data Bus
4 A4 Display Processor
5 A4 Display Ram
6 A7 Timer/Clock/RS-232
7 A7 Public HP-IB
8 A7 System Bus
9 Interrupt System
10 A5 Multiplier
11 A7 Disk Controller
12 A6 Non-Volatile Memory
13 IF Detector Data
14 Keyboard
15 Run Main Program
16 Memory Operations
17 Rerun Self Test
18 Repeat Test Loop
19 Load Program Disk
20 Record Program Disk
21 Initialize Disk
22 Run Service Program
23 Diagnose a Failure
Main Service Functions Menu
Looping Self Tests
System Commands
Disk Commands
Service Commands
ENTER selection, then press =MARKER
85101 Display/Processor Service Program 1
85102 IF/Dectector Service Program 2
Test Set GPIB Service Program 3
Return to Main Service Functions Menu F[,]
NOTES:
1. Hex digits A thru F are assigned to [G/n], [M/u], [k/m],
[X1], [+/-], and [.] respectively.
2. To make a selection, type the number indicated, then
press =MARKER.
3. The default value on data entry is zero.
8510 Service Program Menu
copyright © Agilent Technologies 1987, 1988, 1990, 1998, 2000
85101 is OK
Prove 85102 is OK
Partial Flowchart
Quick Reference
85102 is OK
If All Four Channels are OK,
the 8510XF is OK and You are Done!
If All Four Channels Fail the
Unratioed Power Level Tests
If One, Two, or Three Channels Fail
the Unratioed Power Tests
E7340
flowcht2.cdr
Rev. 2 4/22/98
8510XF System Service Flow Diagram (Sheet 2of2)
From Sheet 1
5-19/5-20
GPIB
GPIB