FOREWORD 
For convenience and 
ease 
of  use,  information on Model 3720A Spectrum Display 
has been presented in two publications: 
.OPERATING  MANUAL 
hp 
Part Number 03720-95000 
(Microfiche 03720-95025) 
Foreword 
.SERVICE  MANUAL 
hp 
Part Number 03720-95001 
(Microfiche 03720-95026) 
HOW  TO  ORDER 
To  order  the  above  publications  contact  the  nearest  Hewlett-Packard Sales  and 
Service  Office (addresses 
at 
the  rear  of this manual). Give the 
hp 
Part Number of 
the publication and the complete model  number, name and serial number of the in- 
strument. 
SERVICE  MANUAL CONTENT 
Section 
I 
contains General  Servicing  Instructions and 
a 
Description of Controls 
and Indicators. 
Section 
Section 
Section 
I 
gives  information  on  Parts  Identification,  Maintenance  and  Repair 
Procedu res. 
II 
contains 
a 
list of Replaceable Parts for the 3720A. 
V 
gives the 3721A/3720A System Troubleshooting Procedure. 
Section 
V  contains  the  Functional  Diagram,  Assembly  Location  Diagrams  and 
Assembly  Packages  including  Schematic  and  Component  Location. 
MICROFICHE 
rhese publications are also available in 6in 
x 
4in microfiche form. Each sheet contains 
up to 60 pages,  maximum,  of 
text 
and  illustrations. Order 
as 
above,  quoting the 
appropriate hpmicrofiche part number. 
ii 
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