Harman Kardon TU-940 User Manual

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 RTCT TA EON TUNED STEREOMONO TUNINGPRESET
RF LEVELSTANDBYWIDENARROWCLOCKTIMERONOFFSLEEPAUTOMEMORYSCAN
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

Harman Kardon TU-940 Specifications

General

Brand	Harman Kardon
Model	TU-940
Category	Tuner
Language	English

Summary

Leakage Test

Specifications

Control and Functions

1. Power

Controls unit power on/off.

2. Numeric Keys

Selects preset stations or stores new ones.

3. Fluorescent Display

Displays frequency, RDS data, and status indicators.

4. Band

Switches between FM and AM frequency bands.

5. IF Band (FM Tuning Only)

Adjusts passband for interference from adjacent stations.

6. Display Mode

Changes display brightness or turns it off.

7. Memory

Enters station into preset memory or starts auto-memory function.

8. Tune/P.Set

Controls preset station stepping or normal tuning.

9. P.Set Scan

Scans through preset stations for playback.

10. Tuning

Selects stations and offers automated tuning methods.

11. Character

Allows naming non-RDS stations with letters/numbers.

12. PTY

Selects program type for RDS stations.

13. Direct

Initiates direct frequency entry of stations.

14. Display

Cycles through display information like frequency and RDS.

15. FM Mode

Sets FM reception to Stereo or Mono mode.

16. RF Mode (FM Tuning Only)

Adjusts for RF intermodulation noise.

17. Auto/Manual

Engages automatic tuning system for station scanning.

Block Diagram

Disassembly Procedures

1. Cover Top Removal

Instructions for removing the top cover.

2. Front Panel Assembly Removal

Steps to remove the front panel assembly.

3. PCB2(Front>Removal

Procedure for removing the front PCB (PCB2).

4. PCB3(Power) Removal

Procedure for removing the power PCB (PCB3).

5. PCB1(Main>Removal

Procedure for removing the main PCB (PCB1).

6. Rear Panel Removal

Steps to remove the rear panel.

Circuit Description

1.uPD78044 CPU Pin Configration

Pin configuration for the uPD78044 CPU.

2.CPU Block Diagram

Block diagram of the CPU.

3. Pin Functions

Detailed pin functions for the CPU.

Alignment Procedures

1. Equipment Required

List of tools and equipment for alignment.

2. Alignment and Test Points

Identifies test points for alignment.

FM Section

Alignment procedures for the FM section.

FM Discriminator Adjustment

Procedure for FM discriminator adjustment.

FM Stereo Distortion Adjustment

Procedure for FM stereo distortion adjustment.

FM Tuned Indication Lighting Level Adjustment

Adjusts the "TUNED" indicator lighting level.

FM Signal Level Adjustment

Adjusts RF level bars on display.

FM Stereo Separation Adjustment

Adjusts stereo separation.

AM Section

Alignment procedures for the AM section.

AM VT Adjustment

Adjustment for AM VT.

AM Tracking Adjustment

Adjustment for AM tracking.

AM Tuned Level Adjustment

Adjusts AM TUNED indicator.

AM Signal Level Adjustment

Adjusts AM RF level bars.

Exploded View

Printed Circuit Board (Front)

Printed Circuit Board (Main)

Electrical Parts List

IC Functional Block Diagram

Packing Material

Wiring Diagram

Schematic Diagram (Front)

Schematic Diagram (Main)