HP 3400A Service Manual

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Table 5-6. Troubleshooting Procedure
Action
PASSES: Proceed to (2)
FAILS: Proceed to (@)
PASSES: Proceed to ®
FAILS: Proceed to ®
PASSES: Proceed t0(8)
FAILS: Proceed to (3)
PASSES: Proceed to @
FAILS: Proceed to @)
PASSES: Proceed to (if)
FAILS: Proceed to Q@)
PASSES: Proceed to (2)
FAILS: Proceed to @)
GOO O8 © © ®@ CF
OYO@® ©
(x)
@)
Precedurs
Creck tor a detective U6C2.
The A6 assembly ts probably working correctiy. Make
sure tne meter assembly M) and associated circuitry are
good.
Measure the ac signal at the output of impedance con-
verter A2 (negative side of C205). The reading snould
be approximatety .96mV RMS.
Measure the ac signal at the input of tne video amplifrer
A4 (positive side of C402). Tne reading should be
approximately .95mV RMS
Measure the ac signal at tne base of O404. The read-
ing should be approximateiy 155mV RMS
Measure the ac signal at tne negative side C427. The
reading shosid be approximately 32mV RMS.
Cneck tor a detective C413 and C415
Cneck tor detective 0404, 0405, 0406 ana associated
circuttry. Also check the thermocoupies (see paragraph
5-34).
Measure the ac signal at-tne emitter of 0402. Reading
snouid pe 1.85mV RMS
Cneck 0401 a Q402 e:rcunry
Cneck 0403 circuitry
Creck second attenuator circurtry A3.
Measure tne ac signal at the input to impedance con-
vener, pin 7 on A2 board. Tne reading should be
apsroximately }mV RMS.
Creck tne impedance converter or power supply. See
Tabie 5-4 for specifications on power supply.
Check tne input attenuator circuitry
Actian
PASSES: Proceed to (Q))
FAILS: Proceed to (11)
PASSES: Proceed to (15)
FAILS Proceed to (2)
PASSES: Proceed to (It)
FAILS: Proceed to @)
PASSES: Proceed to @)
FAILS: Proceed to @)
PASSES: Proceed to
FAILS: Proceed to @)
PASSES: Proceed to (4)
FAILS: Proceed to @)
5-13

HP 3400A Specifications

General

Brand	HP
Model	3400A
Category	Measuring Instruments
Language	English