HP (Hewlett-Packard) TM 11-6625-2779-14&P ユーザーズマニュアル
Model 3555B
Section V
Table 5-6. Front Panel Trouble Analysis (Cont'd)
3555B SHOULD INDICATE
SET ACTUALLY
CORRECTIVE
INPUT CONDITIONS
FUNCTION
(RANGE + METER)*
INDICATES
ACTION
LEVEL -30dBm
Change RANGE to -30dBm
-30dBm
±
0.2dBm
LEVEL 40dBm
Change RANGE to 400dBm
-40dBm
±
0.2dBm
LEVEL -500dBm
Change RANGE to -50dBm
-50dBm
±
0.2dBm
LEVEL -60dBm
Change RANGE to -60dBm
-60dBm
±
0.2dBm
LEVEL -70dBm
Change RANGE to -70dBm
-70dBm
±
0.2dBm
LEVEL -80dBm
Change RANGE to -80dBm
-80dBm
±
0.2dBm
LEVEL 0dBm
RANGE to 0dBm
0dBm
INPUT: TMS, TERM
Measure 270mV ac
±
0.2dBm at
AC MON jacks
NG CHECK
75 UNBAL, Connect
75 UNBAL, Connect
RANGE: 0dBm
Adjust oscillator
UNBAL signal
FUNCTION: VF/Nm
level for 0dBm
between tip and ring
600 BAL
on 3555B meter
Change input
Depress NG button
-40dBm
connection. Connect
Change RANGE to 40dBm
signal between tip
and ring and sleeve
and ring and sleeve
*Some meter jitter may
(tip and ring shorted
be experienced, but the
together), ground
reading should be within
lead to sleeve
the tolerance indicated.
c.
Schematics-- The schematic diagrams
contain dc voltage levels and signal levels
for a specified input condition. This will
assist in troubleshooting individual circuits.
contain dc voltage levels and signal levels
for a specified input condition. This will
assist in troubleshooting individual circuits.
5-31.
FRONT PANEL TROUBLESHOOTING.
5-32.
Before attempting to troubleshoot the set, first
determine from the front panel controls exactly which
functions are performing properly and which ones are
not. In this way, many troubles can be isolated to a
specific area and sometimes to a component.
5-33.
functions are performing properly and which ones are
not. In this way, many troubles can be isolated to a
specific area and sometimes to a component.
5-33.
checking out the front panel controls. This table
indicates what the results should be for each check
along with the specified tolerance. A space is provided
to enter your results. If these spaces are completed for
each check, they will be of great assistance in making
further troubleshooting checks. Whenever a
discrepancy exists between your results and those
indicates what the results should be for each check
along with the specified tolerance. A space is provided
to enter your results. If these spaces are completed for
each check, they will be of great assistance in making
further troubleshooting checks. Whenever a
discrepancy exists between your results and those
indicated in column 3, refer to the "corrective action"
column.
column.
NOTE
This table is designed to help locate
catastrophic failures. If your set is
only out of the specified tolerances,
a complete adjustment and
calibration procedure should be
performed as described in Paragraph
5-14.
catastrophic failures. If your set is
only out of the specified tolerances,
a complete adjustment and
calibration procedure should be
performed as described in Paragraph
5-14.
5-34.
FUNCTION TROUBLESHOOTING.
a.
a.
First determine from the Front Panel
Analysis chart (Table 5-6) exactly which
function is defective. Refer to Table 5-7 for
the probable cause of the malfunction in
the FUNCTION switch assembly.
Analysis chart (Table 5-6) exactly which
function is defective. Refer to Table 5-7 for
the probable cause of the malfunction in
the FUNCTION switch assembly.
5-35.
RANGE TROUBLESHOOTING.
5-13