HP 740B Operating And Service Manual page 71

Model HOB
SECTION
REPLACEABLE
VI
PARTS
Section VI
6-1. INTRODUCTION.
6-2. This section contains information for ordering
replacement parts. Table 6-1 lists the mechanical
parts shown in Figure 6-1; Table 6-2 lists the electrical
components and miscellaneous parts. Table 6-1 lists
parts in numerical order of their reference designators
and indicates the description, -hp- part number and
total quantity of each part. Attaching hardware for
each mechanical part is listed with that part. Table
6-2 lists the electrical components in alpha-numeric
order of their reference designators and indicates the
description and -hp- part number of each part, and
provides the following:
a. Total quantity used in the instrument (TQ
column). The total quantity is given the first
time the part number appears.
b. Typical manufacturer ofthe part in a five-digit
code. (See Appendix A for list of manufacturers).
c. Manufacturers part number.
6-3. Miscellaneous parts are listed at the end of
Table 6-2.
6-4. ORDERING INFORMATION.
6-5. To obtain replacement parts, address order
or inquiry toyour local Hewlett-Packard Field Office.
(See Appendix B for list of office locations. ) Identify
parts by their Hewlett-Packard part numbers. Include
instrument model and serial numbers.
6-6. NON-LISTED PARTS.
6-7. To obtain a part that is not listed, include:
a. Instrument model and serial numbers.
b. Description of the part.
c. Function and location of the part.
DESIGNATORS
A
B
BT
C
CR
DL
DS
E
= assembly
:;:: motor
= battery
= capacitor
= diode
= delay line
= lamp
= misc electronic part
F
FL
HR
IC
J
K
L
M
= fuse
= filter
= heater
= integrated circuit
= jack
= relay
= inductor
= meter
MP
P
Q
QCR
R
RT
S
T
= mechanical part
= plug
= transistor
= transistor-diode
= resistor
= thermistor
= switch
= transformer
TC
V
w
X
XDS
XF
Z
= thermocouple
:;:: vacuum tube, neon
bulb, photocel!, etc.
= cable
= socket
= lampholder
= fuseholder
= network
ABBREVIATIONS
Ag
= silver ill = inside diameter ns
Al :;:: aluminum
impg = impregnated
A = ampere (s)
incd :;:: incandescent nsr
Au = gold
ins = insulation (ed)
C = capacitor
kO
= kilohm (s) = 10+
3
ohms
0
cer :;:: ceramic
coef = coefficient kHz = kilohertz = 10+
3
hertz
obd
COm :;:: common
OD
comp = composition
L
= inductor
conn = connection lin = linear taper
p
log = logarithmic taper
pc
dep = deposited
DPDT = double-pole double- = milli = 10- 3
pF
throw
m
DPST = double-pole single- rnA = milliampere (s) = 10-
3
piv
throw
amperes +6
plo
MHz = megahertz = 10 hertz pos
elect = electrolytic MO
= megohm (s) = 10+ 6 ohms
poly
encap ='encapsulated
met Urn = metal film pot
mfr = manufacturer p-p
F
= farad (s)
mtg
= mounting -3
ppm
FET
= field effect transistor
mV = millivolt (s) = 10 volts prec
fxd = fixed
II-
= micro = 10- 6
-6
GaAs = gallium arsenide
.II-V
= microvolt (s) = 10 volts
GHz
= gigahertz = 10+ 9 hertz
my = Mylar
®
gd
= guard (ed)
nA
= nanoampere (s) = 10- 9
R
Ge
:;:: germanium
amperes Rh
grd = ground (ed)
NC
= normally closed
rms
Ne
:;:: neon
rot
H = henr\, (ies) NO = normally open
Hg
:;:: mercury
NPO
= negative positive zero
Se
Hz = hertz (cycle (s) per (zero temperature co- sect
second) efficient) Si
®
Dupont de Nemours
01794-1
= nanosecond (s) = 10-
9
sl = slide
seconds SPDT = single-pole double-
= not separately replace- throw
able SPST = single-pole single-
throw
= ohm (s)
Ta = tantalum
= order by description
TC = temperature coefficient
= outside diameter
Ti0
2
= titanium dioxide
= peak
tog = toggle
= printed circuit
tol
= tolerance
= picofarad (s) = 10-
12 trim ;:; trimmer
farads
TSTR = transistor
= peak inverse voltage V = volt (s)
= part of vacw = alternating current
= position (s) working voltage
= polystyrene var = variable
= potentiometer vdcw = direct current working
= peak-to-peak
voltage
= parts per million
= precision (temperature W
= watt (s)
coefficient, long term
wi
= with
stability, and/or tol- wiv
= working inverse voltage
erance)
wlo
= without
ww
:;:: wirewound
= resistor
* = optimum value selected
= rhodium
at factory, average
= root-mean-square
value shown (part may
= rotary
be omitted)
= selenium ** = no standard type num-
= section (s)
ber assigned (selected
= silicon
or special type)
6-1