Note On Replacement Parts - Ramsey Electronics FX-440 Manual

NOTE ON REPLACEMENT PARTS:
If you lose or damage parts during assembly or testing, you may, of
course, order any needed replacement parts by calling, writing or faxing
the Ramsey Electronics, Inc. factory. Some of the more common parts
may also be picked up at Radio Shack or other local parts distributors.
Use EXACT values when replacing parts. Following is a GENERAL guide
to obtaining parts for your transceiver as quickly as possible:
[A): Radio Shack or local electronic parts distributor:
Resistors, electrolytic capacitors, disc capacitors, common NPN or PNP
transistors, zener diodes, switching diodes, voltage regulator (SV),
hookup wire, LED, controls, antenna connector, replacement 1-amp
fuses.
lfil:
Order from RAMSEY ELECTRONICS: Most RF and VHF transistors,
coils, crystals, PIN .diodes, varactor diodes, trimmers, filters and most IC
chips.
[CJ: U1, U3 and U6 are Motorola devices and might be in stock at service
shops featuring Motorola equipment. There are acceptable "standard
replacements" for some of the semiconductors used in the transceiver.
"SK" and "ECG" standard replacements are stocked by local electronics
parts distributors or may be ordered through a Radio Shack store. The
following chart should help you make the most cost-effective choice if
replacement semiconductors are needed:
Part ID
Q1, etc.
012,13,14
Q2, etc.
Q3
Q9
Q8
Signal diodes
D3,D23
D2,D7
D6
D18
D11,D12
VR1
VR2
U1
U2
U3
U4
us
U6
Ref. 48
Type
2N3904
PNP 228256
2SC2570
NE02137
MRF-559
MRF-630
1N4148
88405
8A482
8A389
1
N4002
6.2 V zener
7808
7805
MC3335
LM380
UP8569
LM324
LM358
MC145152
Recommended source
RE= Ramsey, RS= Radio Shack
RS 276-1617
RS276-1604 or 2N3906
ECG10, SK9139, 2N5179, or RE
MRF901 or RE
RE
SD1444 or RE
1 N914, RS276-1620 (pack of 50)
RE
ECG553 or RE
RE
RS276-1102, 1 N4003
RS276-561
ECG964, SK3630 or RE
RS276-1no
RE or Motorola
ECG740A, SK3328 or RE
RE
RS276-1711
ECG928, SK3691 or RE
RE or Motorola
FX-440