SECTION 5
table o# replaceable parts
5-1 GENERAL or additional correspondence being required before
proper part identification is possible.
Any changes in the Table of Replaceable Parts will be
listed on a Production Change sheet at the front of The Model 650A Test Oscillator has been manufactured
this manual. over a span of several years with no major change in
specifications or in basic circuitry. The components
The following parts list may be used to determine re- used, however, have changed. Different tube types and
placement parts for all -hp- Model 650A Test Oscil- other miscellaneous components of higher quality have
been incorporated whenever they become available.
lators. To determine the required replacement part,
refer to the schematic diagrams given in Figures 4-9 The components given in this parts list are those used
or 4-10. Use the circuit reference obtained from the in the latest instruments.
schematic diagram to identify correct component in Some older instruments must be modernized before
the Table of Replaceable Parts. these new parts can be used. Refer to paragraphs 3-9
and 4-4.
To assure receiving the correct replacement part,be It is necessary in some instances to substitute parts
sure to include instrument Model and Serial Numbers in this instrument. These substitutions do not impair
as well as the -hp- Stock Number and Description of
instrument performance. Either the substitute part or
the desired part. Failure to include this information the part specified in the Replaceable Parts Table can
may result in delay due to a wrong part being received be used for replacement purposes.
Circuit - hp- Mfr. * & Mfrs
Ref. Description Stock No. De signation
C1 ABC Capacitor: variable, 603 ppf per section 12- 22 HP
C2 AB Capacitor: variable, air, 535 ppf per section 12-7 HP
c3 Capacitor: variable, ceramic, 5-20 ppf 12-20 L
TS 2 A- N3 00
c4 Capacitor: fixed, mica, .01 pf, *lo%, 300 vdcw 14-23 V
Type w
c5 Capacitor: fixed, mica, 10 ppf, *lo%, 500 vdcw (Part of 15-30 V
range switch assembly (65A-19WH)) Type OXM
C6 Capacitor: fixed, mica, .01 pf, *lo%, 300 vdcw 14-23 V
Type w
c7 This circuit reference not assigned.
C8 Capacitor: fixed, mica, 10 ppf, *lo%, 500 vdcw (Part of 15-30 V
range switch assembly (65A-19WH)) OXM
c9 Capacitor: fixed, mica, .01 pf, *lo%, 300 vdcw 14-23 V
Type w
*See "List of Manufacturers Code Letters For Replaceable Parts Table".
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ACEC
