11
Circuit Description
Control Circuitry
Microprocessor Circuit
The microprocessor circuit, which is composed of CPU
IC Q4004 (HD64F2345) and EEPROM IC Q4004 (ATC64N-
10S1), performs various types of processing, such as con-
trol signals, serial I/O, A/D conversion, dial counter cir-
cuit control, key input, and display functions.
The EEPROM memorizes various parameters and settings
(transmission frequency range, transmission output con-
trol) and carrier points according to the transceiver ver-
sion and the contents of memory channels.
Reset Circuit
The reset circuit consists mainly of PANEL Unit ICs Q4014
(PST3445), Q4015 (2SC4154E), Q4011 (2SA1602A), Q4016
(2SC4154E), and Q4010 (2SA1602A), and associated ca-
pacitors and resistors. This circuit controls the power-
down input port, CPU reset input, keyer CPU, and re-
lated circuits.
Dial Counter Circuit
The dial counter circuit consists of Main Dial and SEL (Se-
lector) Knob. This circuit detects a two-phase pulse hav-
ing a phase difference of 90 degrees and delivers it to CPU
IC Q4006 .
Serial Data Communication Circuit
The Serial Data Communication Circuit consists of ICs
Q4008, Q4009, Q4010, etc. on the PANEL-Unit. These ICs
distribute a set of serial data (Data/Clock/Strobe) gener-
ated by CPU to various devices, such as CAR-DDS, REF-
DDS, E.VOL, D/A, or Shift-Register for controlling ana-
log switching , band switching, VCO selection, etc. Serial
data communication is clock synchronous for the above
purposes, whereas the serial data is transferred to an asyn-
chronous signal for the CAT system for external computer
control of the transceiver).
Various types of data, such as operating frequency, mode,
and display data, are processed by CPU IC Q4004 .
The CAT (external computer control) signals are converted
to RS232 interface standard levels by the optional CAT
Interface Cable (CT-62).
Key Matrix Circuit
The key matrix circuit consists of PANEL Unit diodes
D4001-D4003 and D4006 (all IMN10) and the panel key
switches arranged on the matrix. When a key is pressed,
this circuit reads the input data for processing by the CPU.
Analog-Digital Converter Circuitry
Forward and reflected voltage, ALC, DISC, S-meter, etc.
metering options are selected by MAIN Unit IC Q1073
(BU4053BCF) and are fed to the A/D port of CPU IC Q4004
for conversion into digital values to be processed prior to
display on the LCD. The individual voltages, converted
into digital values, are displayed as PO, SWR, ALC, VCC,
and S-meter indications on the LCD panel.
LED Drive Circuit
The LED drive circuit consists of PANEL Unit transistors
Q4018 and Q4019 (both 2SC1623) and the LEDs. This cir-
cuitry drives (turns on/off) the appropriate LEDs.
LCD Circuit
Data processed by the CPU IC is sent as parallel data to
LCD Unit DS4001 .
CTCSS Tone Generator Circuit
The CTCSS tone generator circuit consists mainly of CPU
IC Q4004 and active filter IC Q1094 (NJM2902).
Electronic Keyer Circuit
The electronic keyer circuit consists of CPU IC Q4004.
When the CW mode is selected, this circuit controls the
generation of Morse characters.
Summary of Contents for FT-817
Page 5: ...5 Block Diagram ...
Page 6: ...6 Block Diagram Note ...
Page 12: ...12 Circuit Description Note ...
Page 22: ...22 Alignment Note ...
Page 23: ...23 Interconnection Diagram ...
Page 24: ...24 Interconnection Diagram Note ...
Page 26: ...26 MAIN Unit Note ...
Page 30: ...30 MAIN Unit Lot 30 Note ...
Page 34: ...34 MAIN Unit Lot 32 Note ...
Page 65: ...65 REF UNIT 90 mVrms ...
Page 66: ...66 REF UNIT 2SC4400 NA Q5001 5002 Side B Side A ...
Page 67: ...67 REF UNIT Lot 41 90 mVrms ...
Page 68: ...68 REF UNIT Lot 41 2SC4400 NA Q5001 5002 Side B Side A ...
Page 70: ...70 REF Unit Note ...
Page 71: ...71 PA Unit Circuit Diagram 200 mVp p 850 mVp p 2 2 Vp p 500 mVp p 10 0 Vp p TX 14 0 MHz 5 W ...
Page 72: ...72 FINAL Unit Circuit Diagram 20 Vp p 22 Vp p 5 Vp p 5 Vp p TX 14 0 MHz 5 W ...
Page 76: ...76 FINAL Unit Circuit Diagram 20 Vp p 22 Vp p 5 Vp p 5 Vp p TX 14 0 MHz 5 W ...
Page 88: ...88 PA Unit Final Unit Note ...
Page 98: ...98 PANEL Unit Note ...
Page 101: ...101 ...