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The Harman Kardon

Model TU-940                            

Manual A

AM/FM STEREO DIGITAL RDS TUNER

CONTENTS

LEAKAGE TEST…………………………...…2

SPECIFICATIONS…………………………....3
CONTROL AND FUNCTIONS………………4
BLOCK DIAGRAM……………………………7

DISASSEMBLY PROCEDURES……………8
CIRCUIT DESCRIPTION…………………..13

ALIGNMENT PROCEDURES……………..16

GENERAL UNIT EXPLODED VIEW..…….21

PRINTED CIRCUIT BOARDS…………..…22
ELECTRICAL PARTS LIST……………......24
IC FUNCTIONAL BLOCK DIAGRAM……..32

PACKAGE……………………………………33
WIRING DIAGRAM…………………………35

SCHEMATIC DIAGRAMS………..………..36

                                         

         

harman/kardon

Parts and Service Office

80 Crossways Park West, Woodbury, N.Y. 11797

                                                            Printed in Korea

LOCAL DX

RDS PTY RT CT TA EON TUNED STEREO

MONO TUNING

PRESET

RF LEVEL

STANDBYWIDE

NARROW

CLOCKTIMERON OFF SLEEPAUTOMEMORYSCAN

Power

1

2

3

4

5

6

7

8

9

0

Band

Auto/Man

IF Band

Display

Mode

Memory

TU 940 RDS

Tune/Pst

Pst Scan

Remote sensor

Display

PTY

Direct

Character

Tuning

RF Mode FM Mode

Summary of Contents for TU-940

Page 1: ...AL PARTS LIST 24 IC FUNCTIONAL BLOCK DIAGRAM 32 PACKAGE 33 WIRING DIAGRAM 35 SCHEMATIC DIAGRAMS 36 harman kardon Parts and Service Office 80 Crossways Park West Woodbury N Y 11797 Printed in Korea LOC...

Page 2: ...using Simpson Model 229 Leakage Tester standard equipment item no 21641 RCA model WT 540A or use alternate method as follows plug the power cord directly into a 230 volt AC receptacle do not use an is...

Page 3: ...z 80 dB 65dB AM Suppression 60 dB 50 dB RDS Sensitivity 31 2 6 2 dBf 31 2 6 4 dBf Output Voltage Mono 5006100mV 5006150mV DIMENSIOS W H D 442 92 350 WEIGHT 3 9 Kg POWER SUPPLIES AC 230 V 5 Hz POWER CO...

Page 4: ...display panel contains a large display for station frequency information and RDS data as well as status indicators for various tuner functions and 5 step RF level indicator bars 4 BAND Press to chang...

Page 5: ...lower frequencies will be scanned The tuner will stop at the first station that has acceptable signal strength Turn the knob again in the same direction to tune to the next available station When TUN...

Page 6: ...ations will be muted Press so that the MONO indicator is lit and all stations including all stereo transmissions will be heard in mono NOTE When experiencing weak or noisy reception of a stereo broadc...

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Page 8: ...DISASSEMBLY PROCEDURES 8...

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Page 13: ...13 CIRCUIT DESCRIPTION 1...

Page 14: ...14 2...

Page 15: ...l 36 P37 N C Not used 37 P36 STEREO Input to light STEREO indicator At H it is active 38 P35 TUNED Input to detect station during tuning If L is inputed during tuning tuning stop at that frequency Whe...

Page 16: ...Meter AC Voltmeter DC Voltmeter FM Standard Signal Generator FM SSG Frequency Counter Stereo Modulator Note Remove FM external antenna from terminal when aligning 2 Alignment and Test Points Refer to...

Page 17: ...e 1 Tune the set to 98 MHz 2 Adjust L302 to obtain 0V between TP301 3 reading on the VOM NULL 3 Adjust L200 for a minimum reading on the distortion meter MONO Distortion 4 Repeat adjustments in step 2...

Page 18: ...SSG output level to 20dB 2 Adjust VR301 to the point that the TUNED indicator begins to illuminate FM Signal Level Adjustment Procedure 1 Tune the set to 98MHz 2 Adjust VR401 and VR402 to light all RF...

Page 19: ...ng L CH Stereo separation R CH Stereo separation IF BAND Switch NORMAL Adjust VR 201 NARROW Adjust VR 202 The separation of both channels should be equal AM SECTION AM VT Adjustment 1 Set to AM 522 kH...

Page 20: ...epeat the above adjustments 1 2 and 3 AM TUNED Level Adjustment Procedure 1 Set AM SSG output level so that antenna input level of the set becomes 800 V 58 dB m 2 Adjustment VR 502 to the point that t...

Page 21: ...21 EXPLODED VIEW...

Page 22: ...22...

Page 23: ...PRINTED CIRCUIT BOARD MAIN 23...

Page 24: ...J 100V 8 9x13 T C221 CCCT J681K 0BB CAPACITOR CERAMIC 680PF K 50V B T C222 CCAT J101K AAB CAPACITOR CERAMIC 100PF K 50V B T C223 CEET J1R0M CI0 CAPACITOR E ALUMINUM 1 0uF M 50V 5x11 T C224 CEET J1R0M...

Page 25: ...CEET JR47M CI0 CAPACITOR E ALUMINUM 0 47uF M 50V 5x11 T C602 CCCT J103Z 0DF CAPACITOR CERAMIC 0 01uF Z 50V F T C603 CEET F470M CI0 CAPACITOR E ALUMINUM 47uF M 25V 5x11 T C604 CCTT J330J 0DC CAPACITOR...

Page 26: ...0 E20 COIL AM OSC AAO046 MW 7mm CAN L503 KIAA 00260 E20 COIL AM IFT AAA 026 7MC K502713N4 KR L504 KIAA 00270 E20 COIL AM IFT B AAA 027 L701 KI0T 4101K 003 COIL INDUCTOR 100uH K LA 40 T L 02 CW101 KNCW...

Page 27: ...5 T R307 RCFT E221J 000 RESISTOR CARBON FILM 220ohm 1 5W 5 T R308 RCFT E471J 000 RESISTOR CARBON FILM 470ohm 1 5W 5 T R309 RCFT E102J 000 RESISTOR CARBON FILM 1Kohm 1 5W 5 T R310 RCFT E103J 000 RESIST...

Page 28: ...223J 000 RESISTOR CARBON FILM 22Kohm 1 5W 5 T R518 RCFT E473J 000 RESISTOR CARBON FILM 47Kohm 1 5W 5 T R519 RCFT E104J 000 RESISTOR CARBON FILM 100Kohm 1 5W 5 T R520 RCFT E102J 000 RESISTOR CARBON FIL...

Page 29: ...22C 472 RESISTOR SEMI FIXED RH063MCS3R 4 7Kohm VR401 VFEB A022C 103 RESISTOR SEMI FIXED RH063MC14R 10Kohm VR402 VFEB A022C 103 RESISTOR SEMI FIXED RH063MC14R 10Kohm VR501 VFEB A022C 104 RESISTOR SEMI...

Page 30: ...M 270ohm 1 5W 5 T R937 RCFT E472J 000 RESISTOR CARBON FILM 4 7Kohm 1 5W 5 T R938 RCFT E473J 000 RESISTOR CARBON FILM 47Kohm 1 5W 5 T R939 RCFT E682J 000 RESISTOR CARBON FILM 6 8Kohm 1 5W 5 T R940 RCFT...

Page 31: ...2V 50mA SW920 SWTA 00220 060 SWITCH TACT SKHV10910 A 12V 50mA SW921 SWTA 00220 060 SWITCH TACT SKHV10910 A 12V 50mA SW922 SWTA 00220 060 SWITCH TACT SKHV10910 A 12V 50mA SW923 SWTA 00220 060 SWITCH TA...

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