Section I. INTRODUCTION
1. Scope. This manual lists spares and repair parts that are required for maintenance
of the Dual Trace Oscilloscope,
Tektronix Model SC504. It authorizes the requisitioning and issue of spares and repair parts as indicated by the source
and maintenance codes.
2. General. This repair parts and special tools list (RPSTL) is divided into the following sections:
b. Section II. Repair Parts List. A list of spares and repair parts authorized for use in the performance of
maintenance. The list also includes parts which must be removed for replacement of the authorized parts. Parts lists
are composed of functional groups in numeric sequence, with the parts in each group listed in figure and item number
sequence. Bulk materials are listed in National Stock Number (NSN) sequence.
c. Section III. NSN and Part Number Index. A list, in National Item Identification Number (NIIN) sequence, of all
NSN's appearing in the listings, followed By a list in alphanumeric sequence of all part numbers appearing in the listings.
NSN's and part numbers are cross-referenced to each illustration figure and item number appearance.
3. Explanation of Columns
a. Illustration. This column is divided as follows:
(1) Figure Number. Indicates the figure number of the illustration on which the item is shown.
(2) Item Number. The number used to identify item called out in the illustration.
b Source Maintenance, and Recoverability (SMR) Codes.
(1) Source Code. Source codes indicate the manner of acquiring support items for maintenance, repair,
or overhaul of end items. Source codes are entered in the first and second positions of the Uniform SMR Code
format as follows:
Item procured and stocked for anticipated or known usage.
Item procured and stocked for insurance purpose because essentiality dictates that a minimum quantity be
available in the supply system.
Item procured and stocked and which otherwise would
be coded PA except that it is deteriorative in nature.
Support item, excluding support equipment, procured for initial issue or outfitting and stocked only for
subsequent or additional initial issues or outfittings. Not subject to automatic replenishment.
Support equipment procured and stocked for initial issue or outfitting to specified maintenance repair activities.
Support equipment which will not be stocked but which will be centrally procured on demand.