Yaesu FT-2500M, Техническое дополнение

Страница: 2 / 67

Contents
I. General Information
Introduction . . . . . . . .
Specifications . . . . . . .
Chip Component Information . .
Circuit Description· . . . . .
Block Diagram . . . . . . . . . .
Interconnection Diagram . . . .
Exploded View & Miscellaneous Parts .
II. Servicing
Case Disassembly & PCB Access
LCD & Control Unit Access
Lithium Backup Battery Replacement
Panel Lamp Replacement
9600 Baud Packet Modification
Channel Display-Only Mode
Alignment ......... .
PLL & Transmitter
.... 1-1
. 1-2
. 1-3
. . 1-7
.. 1-11
... 1-13
. 1-15
. 2-1
2-1
2-1
2-1
2-2
2-4
•
2-5
2-6
PLL
VCV (Varactor Control Voltage) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
PLL
Reference Frequency .................................................. 2-7
Transmitter Output .................................................... 2-7
Transmitter Deviation ................................................... 2-7
Receiver
2-8
Interstage Transformers ......................................... . . ........ 2-8
S-Meter Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Scanner Center Stop ........ . ........................................... 2-8
Squelch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
III. Board Units (Schematics, Layout
&
Parts List)
VCOUnit .. . 3A-1
. .. 3B-1
. . 3C
MAINUnit.
MIC Unit ...
CNTL Unit ..
DISPLAY Unit . . . 3D-1
. 3E-1
IV. Optional Board Units (Schematics, Layout & Parts)
FRC-6 DTMF Paging Unit . . . . .
.
. 4A-1
.. 4B-1
... 4C
FTS-17A CTCSS T one Squelch Unit
MH-26GSJ Microphone
MH-27 ABJ Microphone . . . . . . . .
Cut out the label at the right and place
it behind the clear plastic window in
the spine of the manual binder.
. 4D-1
,-------------------------- ---,
i
FT-2500M
i
I
I
: Technical Supplement :
I
I
L
__________________________
_J