HP 54520 Series Service Manual page 87

PERFORM SIGNAL TESTS ON ALL
CHANNELS.
NOTE WHICH CHANNELS FAIL.
To troubleshoot the instrument
CHART 6A
REPLACE FAULTY
ATTENUATOR. PUT GOOD
(SEE ATTENUATOR TROUBLE—
SHOOTING. )
SWAP FATLING
CHANNEL ATTENUATOR
WITH A GOOD ONE
54504808
BE SURE DEFAULT CALS ARE
LOADED (CHART 1)
PERFORM GLICK TEST ON ALL
CHANNELS. NOTE WHICH
CHANNELS FAIL. (SEE
ATTENUATOR TROUBLESHOOTING)
00
ANY CHANNELS
FAIL?
SWAP FAILING
CHANNEL ATTENUATOR
WITH A GOOD ONE
TEST ON THE
TWO SWAPPED
CHANNELS:
MEASURE INPUT IMPEDANCE
OF EACH CHANNEL .
{SEE INPUT RESISTANCE
PERFORMANCE TEST SECTION 3)
5@ OHM
PERFORM SIGNAL
TEST ON THE
TWO SWAPPED
CHANNELS:
PERFORM CLICK
ATTENUATOR INTO
ORIGINAL CHANNEL
REPLACE MAIN
ASSEMBLY
GO TO CHART 1
SAME ATTENUATOR NO
REPLACE FAULTY
ATTENUATOR. PUT GOOD
ATTENUATOR INTO ITS
ORIGINAL CHANNEL
AND 1M OHM
?
REPLACE
ATTENUATOR
MEASURE EXT
TRIG. IMPEDANCE
{CHAN MENU-EXT}
5@ CHM No
REPLACE MAIN
AND 1M OHM
?
YES
atone GO TO CHART 1
Trouble Isolation Chart for Attenuators
ASSEMBLY
GO TO CHART 1
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