Adjustment - Kenwood TK-80 Service Manual

Required Test Equipment
1. Stabilized Power Supply
1) The supply voltage can be changed between 5V and
18V, and the current is 30A or more.
2) The standard voltage is 13.6V.
2. DC Ammeter
1) Class 1 ammeter (17 ranges and other features).
2) The full scale can be set to either 3A or 30A.
3) A cable of less internal loss must be used.
3. Frequency Counter (f. counter)
1) Frequencies of up to 1GHz or so can be measured.
2) The sensitivity can be changed to 500MHz or below,
and measurements are highly stable and accurate
(0.2ppm or so).
4. Power Meter
1) Measurable frequency : Up to 500MHz
2) Impedance : 50Ω, unbalanced
3) Measuring range : Full scale of 150W or so
4) A standard cable (5D2W 1m) must be used.
5. RF VTVM (RF V.M)
1) Measurable frequency : Up to 500Hz or so
6. Digital Voltmeter (D.V.M)
1) Voltage range : FS = 18V or so
2) Input resistance : 1MΩ or more
7. Oscilloscope
1) Measuring range : DC to 100MHz
2) Provides highly accurate measurements for 5 to
25MHz.
8. AF Voltmeter (AF V.M)
1) Measurable frequency : 50Hz to 1MHz
2) Maximum sensitivity : 1mV or more
9. AF Generator (AG)
1) Frequency range : 200Hz to 5kHz
2) Output : 1mV or less to 1V, low distortion
10. Spectrum Analyzer
1) Measuring range : DC to 1GHz or more
11. Standard Signal Generator (SSG)
1) Maximum frequency : 500MHz or more
2) Output : –20dB/0.1µV to 120dB/1V
3) Output impedance : 50Ω
12. Tracking Generator
1) Center frequency : 50kHz to 500MHz
2) Frequency deviation : ± 35MHz
3) Output voltage : 100mV or more
13. Dummy Load (DM)
1) AF Dummy 4Ω, 5W or more
2) RF Dummy 150Ω, 150W or more
14. Directional Coupler
• Use a non-conductive rod such as a Bakelite rod for
adjustment (especially of trimmers and coils).
• To protect the SSG, do not send out signals while ad-
justing the receiving unit.
• The indicated SSG output levels are for maximum out-
put.
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ADJUSTMENT

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Service Adjustment Mode
1. Function
1) Service adjustment mode is only to set the adjustment
items displayed in the service adjustment mode menu.
2) Adjusted data is all stored in the EEPROM.
3) The EEPROM is only renewed when MENU No. 39 is en-
tered and writing done by means of [MODE] or [DATA].
2. Setting
1) [POWER] ON while holding [SCAN] and [DATA].
2) Use [DIAL] to select the MENU No.
3) Set the data using [MODE] or [DATA].
4) MENU No. 39 writes data to the EEPROM.
"RUN" is displayed while writing.
"GOOD" is displayed when writing has been successfully
completed.
"ERROR" is displayed when a writing error occurs.
(At this time, press [MODE] or [DATA] once again.)
5) This function is turned off by turning [POWER] OFF.
NOTE:
When repairing X53-3570-21 board, you may find the
shortness of the flat cable makes checking the unit difficult.
We provide the E37-0572-05 (for control unit) and the E37-
0573-05 (for AT) cables as servicing parts which you may or-
der as necessary.
3. Adjustment mode menu (Menu No. 00~39)
No.
00 Checksum display
01 100W (MAX) power setting, RF meter 100W point intake
02 50W (HI) power setting, RF meter 50W point intake
03 25W (MID) power setting, RF meter 25W point intake
04 15W (LO) power setting, RF meter 15W point intake
05 12.5W (HI) power setting, RF meter 12.5W point intake
06 Power setting during AT
07 6.25W (MID) power setting, RF meter 6.25W point intake
08 3.75W (LO) power setting, RF meter 3.75W point intake
09 100W power setting TX gain, RF meter 100W point intake
10 50W power setting TX gain, RF meter 50W point intake
11 25W power setting TX gain, RF meter 25W point intake
12 TX gain setting during 15W, RF meter 15W point intake
13 TX gain setting during AT
14 TX gain setting during 25W
15 TX gain setting during 12.5W
16 TX gain setting during 6.25W
17 TX gain setting during 3.75W
18 SSB microphone sensitivity setting
19 AM microphone sensitivity setting
TK-80
Contents
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