Adjustment - Kenwood TH-D74E Service Manual

4.1 Updating the Firmware
The firmware can be updated using Firmware Updating Program
(s).
Update the firmware according to the procedure displayed in
updating program.
Download the latest updating program from the following URL:
http://www.kenwood.com/i/products/info/amateur/
software_download.html
* The URL may change without notice.
4.2 Required Test Equipment
(1) Stabilized Power Supply
a) The supply voltage can be changed between 3V and
16V and the current is 3A or more.
b) The standard voltage is 13.8V.
(2) DC Ammeter (DC. A)
a) Class 1 ammeter (17 ranges and other features)
b) The full scale can be switched between 300mA and
3A.
c) A cable with low internal loss must be used.
(3) Frequency Counter (f. counter)
a) Frequencies of up to 1GHz or so can be measured.
b) The sensitivity can be changed to 250MHz or below
and measurements are highly stable and accurate
(about 0.2ppm).
(4) Power Meter (terminal type)
a) Measurable frequency: Up to 500MHz
b) Impedance: 50 ohm, unbalanced
c) Measuring range: Full scale of 10W
d) The specified special connection cable must be
used.
(5) RF Voltmeter (RF VM)
a) Measurable frequency: Up to 500MHz or so
(6) Linear Detector
a) Measurable frequency: Up to 500MHz
b) Characteristic is flat and CN is 60dB or more.
(7) Digital Voltmeter (DVM)
a) Voltage range: FS = 18V or so
b) Input resistance: 1M ohm or more
(8) Oscilloscope
a) Measuring range: DC to 30MHz
b) Provides highly accurate measurements for 5 to
25MHz
(9) AF Voltmeter (AF VM)
a) Measurable frequency: 50Hz to 1MHz
b) Maximum sensitivity: 1mV or more
(10) Spectrum Analyzer
a) Measuring range: DC to 1GHz or more
(11) Standard Signal Generator (SSG)
a) Maximum frequency: 500MHz or more
b) Output: -133dBm (0.05μV) to -13dBm (50mV)
c) Output impedance: 50 ohm
(12) Tracking Generator
a) Center frequency: 50kHz to 200MHz
b) Frequency deviation: ±35MHz
c) Output voltage: 100mV or more
(13) Dummy Load
a) 8 ohm, 3W or more
1-28 (No.RA044<Rev.001>)
SECTION 4

ADJUSTMENT

4.3 Service Jig
Battery Jig (W3F-0208-00)
Connect the power cable properly between the battery jig
installed in the transceiver and the power supply, and be sure
output voltage and the power supply polarity prior to switching
the power supply ON, otherwise over voltage and reverse
connection may damage the transceiver, or the power supply or
both.
Note:
When using the battery jig, you must measure the voltage at
the terminals of the battery jig. Otherwise, a slight voltage
drop may occur within the power cable, between the power
supply and the battery jig, especially while the transceiver
transmits.
Schematic diagram
S
-
+
- Terminal +Terminal
+ Terminal(Red) + Terminal(Red)
- Terminal(Black) - Terminal(Black)
+