Kenwood TS 440 S Service Manual

Page 1

KENWOOD

SERVICE MANUAL

Is-IIns IIIIIIEIIFII'IIIIIII:IIIIII'"5"

HF TRANCEIVER

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RadioAmateur.EU

CONTENTS
SPECIFICATIONS ............................................. 2 PACKING ........... 88
CIRCUIT DESCRIPTION .................................... 4 ADJUSTMENT ............................................... 89
SEMICONDUCTORS ....................................... 27 LEVEL DIAGRAM .......................................... 101
PARTS LIST .................................................. 35 BLOCK DIAGRAM ........................................ 103
PC BOARD SCHEMATIC DIAGRAM OPTION
SWITCH UNIT ........................................... 69 P850 ..................................................... 104
FILTER UNIT ........................................ 7o, 71 PS-430 ................................................... 109
PLL UNIT ............................................ 72, 73 V84 ...................................................... 111
RF UNIT .............................................. 74, 75 SP-43O ................................................... 114
CONTROL UNIT ................................... 76, 77 MB-430 .................................................. 114
DISPLAY UNIT ..................................... 76, 77 AT-44O ................................................... 114
FINAL UNIT ............................................... 78 YK-SBS/SN .............................................. 114
IF UNIT ............................................... 78, 79 YK-88C/CN ...................................... , ....... 114
AT UNIT ................................................... 8O SCHEMATIC DIAGRAM ________________________________ 113

DISASSEMBLY .............................................. 81

Page 101

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PREPARATION

Unless otherwise specified, set the controls as follows.
POWER ............... ON SELECTIVITY ............. AUTO
BAND ................. 14 AGC FAST ................. SLOW
AF ..................... MIN NOTCH SW ............... OFF
FIF ...................... MAX PROC SW .................. OFF
NOTCH ............... CENTER F.LOCK SW ............... OFF
SOUELCH ........... MIN IMHz SW .................. OFF
MIC .................... MIN NB SW ...................... OFF

REQUIRED TEST EQUIPMENT

1.

DC VoItmeter IDC V.M)

1) Input resistance: More than 1M9

2) Voltage range: 1.5 to 1000V AC/DC

NOTE: A high-precision multimeter may be used.
However, accurate reading can not be obtained for high-
impedance circuits.

DC Ammeter

1) Current range: 1.5A, 3A, 20A, High-precision
ammeter may be used.

. RF VTVM (RF V.MI

1) Input impedance: 1M9 and less than 3pF, min.
2) Voltage range: 10mV to 300V
3) Frequency range: 10kHz to 100MHz or greater

AF Voltmeter (AF V.M)

1) Frequency range: 50Hz to 10kHz
2) Input resistance: 1M0 or greater
3) Voltage range: 10mV to 30V

. AF Generator (AG)

1) Frequency range: 200Hz to 5kHz
2) Output: 1mV or less to 1V, low distortion

. AF Dummy Load

1) Impedance: 89
2) Dissipation: 3W or greater

. Oscilloscope (SCOPE)

Requires high sensitivity. and external synchronization
capability.

CAR ................... MIN ATT SW .................... OFF
IF-SHIFT ............. CENTER SEND/REC ................. REC
FUNCTION AUTO ....................... OFF

A/B ............... A AT TUNE ................... OFF
RIT,XIT,SPLIT ...... OFF VOX SW ................... OFF

10.

11.

12.

13.

. Sweep Generator (SWEEP)

1) Center frequency: 50kHz to 90MHz
2) Frequency deviation: MaximumtBSMHz
3) Output voltage: 0.1V or greater

. Standard Signal Generator ISSG)

1) Frequency range: 50kHz to 50MHz

2) Output: -20dB/0.1uV to 120dB/1V

3) Output impedance: 509

4) AM and FM modulation can be possible.
NOTE: Generator must be frequency stable.

Frequency Counter If. counter)

1) Minimum input voltage: 50rnV

2) Frequency range: 50MHz or greater

Noise Generator

Must generate ignition noise containing harmonics be-
yond 30MHz.

RF Dummy Load

1) Impedance: 1509 and 200

2) Dissipation: 150W or greater

Power Meter

1) Impedance: 500
2) Dissipation: 150W cintinuous or greater
3) Frequency limits: 60MHz or greater

89