Harman Kardon AVR-2550 Service manual

AVR 2550 Audio/VideoReceiver

AVR 2550

Service Manual

Power for the Digital Revolution

®

™

TECHNICAL SPECIFICATIONS

Technical Specifications

Audio Section

Stereo Mode
Continuous Average Power (FTC)

50 Watts per channel, 20Hz–20kHz,
@ < 0.07% THD, both channels driven into 8 ohms

Five-Channel Surround Modes
Power Per Individual Channel

Front L&R channels:
40 Watts per channel,
@ < 0.07% THD, 20Hz–20kHz into 8 ohms

Center channel:
40 Watts, @ < 0.07% THD, 20Hz–20kHz into 8 ohms

Surround channels:
40 Watts per channel,
@ < 0.07% THD, 20Hz–20kHz into 8 ohms

Input Sensitivity/Impedance

Linear (High Level) 200mV/47kohms

Signal-to-Noise Ratio (IHF-A) 95dB

Surround System Adjacent Channel Separation

Analog Decoding 40dB
(Pro Logic, etc.)
Dolby Digital (AC-3) 55dB
DTS 55dB

Frequency Response

@ 1W (+0dB, –3dB) 10Hz–100kHz

High Instantaneous
Current Capability (HCC) ±25 Amps

Transient Intermodulation
Distortion (TIM) Unmeasurable

Rise Time 16 µsec

Slew Rate 40V/µsec

FM Tuner Section

Frequency Range 87.5–108MHz
Usable Sensitivity IHF 1.3 µV/13.2dBf
Signal-to-Noise Ratio Mono/Stereo: 70/65dB (DIN)
Distortion Mono/Stereo: 0.15/0.3%
Stereo Separation 35dB @ 1kHz
Selectivity ±300kHz: 65dB
Image Rejection 80dB
IF Rejection 90dB

AM Tuner Section

Frequency Range 522–1620kHz
Signal-to-Noise Ratio 45dB
Usable Sensitivity Loop: 500µV
Distortion 1kHz, 50% Mod: 0.8%
Selectivity ±9kHz: 30dB

Video Section

Video Format PAL/NTSC
Input Level/Impedance 1Vp-p/75 ohms
Output Level/Impedance 1Vp-p/75 ohms
Video Frequency
Response 10Hz–8MHz (–3dB)

General

Power Requirement AC 220-240V/50Hz
Power Consumption 72W idle, 580W maximum

(2 channels driven)

Dimensions (Max)

Width 440mm
Height 166mm
Depth 365mm
Weight 10.6 kg

Depth measurement includes knobs, buttons and terminal connections.
Height measurement includes feet and chassis.
All features and specifications are subject to change without notice.

Harman Kardon is a registered trademark, and Power for the digital revolution is a
trademark, of Harman International Industries, Inc.

*Manufactured under license from Dolby Laboratories.
“Dolby”, “Pro Logic”, and the Double-D symbol are
trademarks of Dolby Laboratories, Inc.
Confidential Unpublished Works. ©1992–1999 Dolby Laboratories, Inc.
All rights reserved.

†

“DTS” and “DTS Digital Surround” are registered trademarks of

Digital Theater Systems, Inc.

††

UltraStereo is a trademark of UltraStereo Corp.

VMAx is a trademark of Harman International Industries, Inc., and is an
implementation of Cooper Bauck Transaural Stereo under patent license.

Logic 7 is a registered trademark of Lexicon, Inc.

Crystal is a registered trademark of Cirrus Logic Corp.

48 TROUBLESHOOTING GUIDE

TROUBLESHOOTING

SYMPTOM CAUSE SOLUTION

Unit does not function when Main • No AC Power • Make certain AC power cord is plugged into a live outlet
Power Switch is pushed • Check to see whether outlet is switch-controlled

Display lights, but no sound • Intermittent input connections • Make certain that all input and speaker connections are secure
or picture •

Mute is on • Press Mute button

• Volume control is down • Turn up volume control

Unit turns on, but front-panel • Display brightness is turned off • Follow the instructions in the Display Brightness section
display does not light up on page 30 so that the display is set to VFD FULL

No sound from any speaker; • Amplifier is in protection mode • Check speaker wire connections for shorts at receiver and
light around power switch is red due to possible short speaker ends

• Amplifier is in protection mode • Contact your local Harman Kardon service center, which you can
due to internal problems locate by visiting our Web site at www.harmankardon.com

No sound from surround or • Incorrect surround mode • Select a mode other than Stereo or Dolby 3 Stereo
center speakers • Input is monaural • There is no surround information from mono sources

• Incorrect configuration • Check speaker mode configuratioin

• Stereo or Mono program material • The surround decoder may not create center- or rear-channel

information from nonencoded programs

Unit does not respond to • Weak batteries in remote • Change remote batteries
remote commands • Wrong device selected • Press the AVR selector

• Remote sensor is obscured • Make certain front-panel sensor is visible to remote

or connect remote sensor

Intermittent buzzing in tuner • Local interference • Move unit or antenna away from computers, fluorescent

lights, motors or other electrical appliances

Letters flash in the channel indicator • Digital audio feed paused • Resume play for DVD
display and digital audio stops • Check that Digital Input is selected

AMPLIFIER SECTION BIAS ADJUSTMENT

Measurement condition

. No input signal or volume position is minimum.

Standard value.

. Ideal current = 48mA ( ± 5%)
. Ideal DC Voltage = 21.12mV ( ± 5%)

CUP11517X (MAIN PCB)

CN63

CN62

VR62

VR64

CN64

VR61

CN61

VR63

DC VOLTMETER..............Connect to CN61, CN62, CN63, CN64, CN65

NO. Channel Adjust for

1 Front Left 21.12mV (±5%)

2 Front Right 21.12mV (±5%)

3 Center

4 Surround Left

5 Surround Right

21.12mV (±5%)

21.12mV (±5%)

21.12mV (±5%)

CN65

VR65

Adjustment

VR61

VR62

VR63

VR64

VR65

TRANSISTOR, REGULATOR IC BLOCK DIAGRAM

TO-92M

1. Emitter

2. Collector

3. Base

1. Emitter

2. Collector

3. Base

KTC2874B
KRA107M

2SA1360O
KTD600KG

KTD1302T
KTC3200GR
KTA1271Y

KTA1268GR
KTC3198Y

KSC2785Y
KRC107M

2SC3423O

1. Emitter

2. Collector

3. Base

TO-126

TO-92

123

123

123

1. Base

2. Collector

3. Emitter

KSA614Y

TO-220

123

1. INPUT

2. GND

3. OUTPUT

MC7815C MC7805C

TO-220

123

1. GND

2. INPUT

3. OUTPUT

MCNJM7905 MC7915C

TO-220

123

1. Base

2. Collector

3. Emitter

2SB1647 2SD2560

KTA1024Y KSC2316Y

1. Emitter

2. Collector

3. Base

TO-3P

TO-92L

123

123

TC9482F (ELECTRONIC VOLUME/INPUT) : IC31

NC VSS VDD TEST

2

1

28 27

L-OUTA

L-INA

L-A-GNDA

L-OUTB

L-INB

L-A-GNDB

L-OUTC

L-INC

L-A-GNDC

CS1

GND

10

11

12

13

3

4

5

6

7

8

9

1dB

VR

latch

8dB

VR

latch

1dB

VR

latch

8dB

VR

latch

1dB

VR

latch

8dB

VR

latch

Shift register (32BIT)

Level shift circuit

3 to 7

decoder

4 to 13

decoder

Same as L-ch

Circuit

Strobe generate

circuit

3

4

5

6

7

8

9

10

11

12

13

L-OUTA

L-INA

L-A-GNDA

L-OUTB

L-INB

L-A-GNDB

L-OUTC

L-INC

L-A-GNDC

CS1

GND

CK

14

14

CK

TC9215AF

TC9215AF (TONE CONTROL : IC80)

BLOCK DIAGRAM

GND 1

OFF 2

3S

10

S

4

11

S

5

12

S

6

20

S

7

21

V

8

ss

16 V

15

S

S

14

S

13

S

12

S

11

10

S

9

S

DD

40

41

42

34

32

31

30

LEVEL SHIFTER

2

1

2

3

4

1

5

6

2

7

8

3

1

2

3

4

1

5

6

2

7

8

3

1

3

4

5
6

7

8
9

10

14 28

11

12
13

27

26

25
24

23
22

21
20

19
18

17
16

15

LATCH CIRCUIT

SHIFT REGISTER

LEVEL SHIFTER

LATCH CIRCUIT

L-S R-S

Vss GND VDD

L-S

L-S

L-S

L-COM

L-S

L-S

L-COM

L-S

L-S

L-COM

ST

R-S

R-S

R-S

R-COM

R-S

R-S

R-COM

R-S

R-S

R-COM

DATA

CK

LEVEL SHIFTER

2

1

2

3

1

4

5

6

2

7

8

3

1

2

3

1

4

5

6

2

7

8

3

1

3

4

5
6

7

8
9

10

14 28

11

12
13

27

26

25
24

23
22

21
20

19
18

17
16

15

LATCH CIRCUIT

SHIFT REGISTER

LEVEL SHIFTER

LATCH CIRCUIT

L-S R-S

Vss GND VDD

L-S

L-S

L-COM

L-S

L-S

L-S

L-COM

L-S

L-S

L-COM

ST

R-S

R-S

R-COM

R-S

R-S

R-S

R-COM

R-S

R-S

R-COM

DATA

CK

TC9164AF (FUNCTION/INPUT) : IC22

BLOCK DIAGRAM

TC9163AF (FUNCTION/INPUT) : IC20

BLOCK DIAGRAM

LEVEL SHIFTER

2

1

2

1

3

4

2

5

6

3

7

4

1

2

1

3

4

2

5

6

3

7

4

1

3

4

5

6

7

8

9

10

14 28

11

12

13

27

26

25

24

23

22

21

20

19

18

17

16

15

LATCH CIRCUIT

SHIFT REGISTER

LEVEL SHIFTER

LATCH CIRCUIT

L-S R-S

Vss GND VDD

L-S

L-COM

L-S

L-S

L-COM

L-S

L-S

L-COM

L-S

L-COM

ST

R-S

R-COM

R-S

R-S

R-COM

R-S

R-S

R-COM

R-S

R-COM

DATA

CK

LEVEL SHIFTER

2

1

2

1

3

4

2

5

6

3

7

4

1

2

1

3

4

2

5

6

3

7

4

1

3

4

5

6

7

8

9

10

14 28

11

12

13

27

26

25

24

23

22

21

20

19

18

17

16

15

LATCH CIRCUIT

SHIFT REGISTER

LEVEL SHIFTER

LATCH CIRCUIT

L-S R-S

Vss GND VDD

L-S

L-COM

L-S

L-S

L-COM

L-S

L-S

L-COM

L-S

L-COM

ST

R-S

R-COM

R-S

R-S

R-COM

R-S

R-S

R-COM

R-S

R-COM

DATA

CK

TC9162AF (FUNCTION/INPUT : IC30)

BLOCK DIAGRAM

TC9162AF (FUNCTION/INPUT : IC30)

BLOCK DIAGRAM

No. 5606-3/13

Top view

PIN ASSIGNMENT (TOP VIEW)

Pin Pin No. Function I/O Handling when unused

V

FL

1, 13 Driver block power supply connection. (Both pins must be connected.) — —

V

DD

60 Logic block power supply connection. Provide a voltage between 4.5 and 5.5 V. — —

V

SS

57 Power supply connection. Connect to the ground. — —

OSCI 59

Oscillator connection. An oscillator circuit is formed by connecting an external resistor

I GND

OSCO 58

and capacitor to these pins.

O OPEN

Display off control input.

BLK 61

BLK = Low (V

SS

) ... Display off. (S1 to S43 and G1 to G11 at VFLlevel.)

I GND

BLK = High (V

DD

) ... Display on.

Note that serial data can be transferred while the display is turned off.

CL 63

DI 64 I GND

CE 62

G1 to G11 2 to 12 Digit outputs. These pins are P-channel open drain outputs with pull-down resistors. O OPEN

S1 to S43 56 to 14

Segment outputs for displaying the display data transferred by serial data input. These pins

O OPEN

are P-channel open drain outputs with pull-down resistors.

Serial data transfer inputs. These pins must be connected to the system microcontroller.
CL: Synchronization clock
DI: Transfer data
CE: Chip enable

BLOCK DIAGRAM

VFD DRIVER IC PIN FUNCTION (LC75725E) : IC74

PIN No. Pin Name I/O Function

1,12,23 +VD1 - Digital Power supply. Normally +2.5v

2,13,24 DGND - Digital Ground

3 AUD3 O SPDIF transmitter output/Digital audio output(N.C)

4 WR I Host write strobe pin(connected to GND with an external resistor)

5 RD I Host parallel output enable pin(pulled up with an external resistor)

6 CS_DA I SPI Serial data input pin

7 CS_CK I Serial control clock input pin

8 EMAD7 I/O

9 EMAD6 I/O

10 EMAD5 I/O

11 EMAD4 I/O Serial data IN/OUTPUT pins(pulled up with an external resistor)

14 EMAD3 I/O

15 EMAD2 I/O

16 EMAD1 I/O

17 EMAD0 I/O

18 CS_CE I Host parallel chip select pin

19 SCDIO(AK_DOUT) O Serial control port data ouput pin

20 INTREQ O Control port interrupt request output pin

21 EXTMEM I/O External Memory Chip Selector(pulled up with an external resistor)

22 SDATAN1(SDI) I PCM audio data input number 1 pin

25 SCLKN1(BICK) I PCM audio input bit clock pin

26 LRCLKN1(LRCK) I PCM audio input sample rate clock pin

27 CMPDAT(SDI) I PCM audio data input number 2 pin

28 CMPCLK(BICK) I PCM audio input bit clock pin

29 CREQ(LRCK) I PCM audio input sample rate clock pin

30 CLKIN(XIN) I Master clock input(used external clock)

31 CLKSEL(GND) I DSP clock mode select pin: connect the GND

32 FILT1 Connects to an external filter for the on-chip phase-locked loop

33 FILT1 Connects to an external filter for the on-chip phase-locked loop

34 +2.5V - Analog Power supply for clock generator . Normally +2.5V

35 AGND - Analog ground supply for clock generator PLL.

36 RESET(CS_RST) I Master reset input pin

37 DBDATA - Reserved pin and should be pulled up with an external resistor.

38 DBCLK - Reserved pin and should be pulled up with an external resistor.

39 AUD2(SDO2) O PCM multi-format digital-audio data ouput2 pin

40 AUD1(SDO1) O PCM multi-format digital-audio data ouput1 pin

41 AUD0(SDO0) O PCM multi-format digital-audio data ouput0 pin

42 LRCLK I Audio output sample rate clock pin

43 SCLK(BICK) I Audio ouput bit clock pin

44 MCLK I Audio master clock output pin

AUDIO DSP (CS493263 - CLG : IC79)

PIN ASSIGNMENT.(CS493263)

(TOP VIEW)

BlOCK DIAGRAM(CS493263)

VD1

DGND1

AUDATA3, XMT958
WR,DS,EMWR,GPIO10
RD,R/W,EMOE,GPIO11

A1,SCDIN

A0,SCCLK

DATA7,EMAD7,GPIO7

DATA6,EMAD6,GPIO6
DATA5,EMAD5,GPIO5
DATA4,EMAD4,GPIO4

VD2

DGND2

DATA3,EMAD3,GPIO3
DATA2,EMAD2,GPIO2

DATA1,EMAD1,GPIO1
DATA0,EMAD0,GPIO0

CS

SCDIO,SCDOUT,PSEL,GPIO9

ABOOT,INTREQ

EXTMEM,GPIO8

SDATAN1

7
8
9
10
11
12
13
14
15
16
17

6 5 4 3 2 1 44 43 42 41 40

CS493XXX-CLG

44-pin PLCC

Top View

18 19 20 21 22 23 24 25 26 27 28

MCLK
SCLK

LRCLK
AUDATA0

AUDATA1
AUDATA2

DC

39
38
37
36
35
34
33
32
31
30
29

DD
RESET
AGND

VA

FILT1
FILT2

CLKSEL
CLKIN

CMPREQ,LRCLKN2
CMPCLK,SCLKN2

CMPDAT,SCLKN2,RCV958
LRCLKN1

SCLKN1,STCCLK2
DGND3

VD3

DATA7:0,

EMAD7:0,

GPIO7:0

Controller

RAM Input

PLL

CMPDAT
SDATAN2

CMPCLK
SCLKN2

CMPREQ
LRCLKN2

SCLKN1
STCCLK2

LRCLKN1
SDATAN1

CLKIN

CLKSEL

RESET

Compressed

Data Input

Interface

Digital

Audio

Input

Interface

Clock Manager

Framer

Shifter

Input

Buffer

Buffer

CS

RD,

R/W,

EMWR,

EMOE,

GPIO10

GPIO11

DSP Processing

RAM

Program

Memory

ROM

Program

Memory

WR,

DR,

SCDIO,

SCDOUT,

PSEL,

GPIO9

Parallel or Serial Host Interface

24-Bit

RAM
Data

Memory

ROM

Data

Memory

STC

A0,

SCCLK

Output

A1,

SCDIN

RAM

Buffer

A800T

INTERQ

EXTMEM.

GPIO8

Output

Formatter

DD
DC

MCLK

SCLK

LRCLK

AUDA

XMT95

FILTD FILTS VA AGND DGND(3:1) VD(3:1)

CM2054C

Ise Electronics Corporation

:Grid Assignment

G10 G9 G8 G7 G6 G5 G4 G3 G2 G1

S16

S18

S22

S15

S21

S15

Sheet 4/5

Scale 3:1
Unit : mm

S16

S10

S3

S7

S14

S1

S17

S3

S5

S1

S7

S4

S6

S2

S14

S12

S16

S13

S10

S15

S11

S4

S3 S9

S7 S13

S13

S11
S8

S5

S2

G3-G10 G2 G1

S12

S9

S6

S4

S19

S10

S1

S12S6

Sheet 5/5

CM2054C

S1
S2
S3
S4
S5
S6
S7
S8

S9
S10
S11
S12
S13
S14
S15
S16
S17
S18
S19
S20
S21
S22
S23
S24

LFE

SBL

S10

S12
S13
SBR
S15
S16

S18
S19

S21
S22

NIGHT

:Anode & Grid Assignment

G1
S1

S3
S4
SL
S6
S7

S9

SR

R

C

L

G2 G3 G4 G5 G6 G7 G8 G9 G10
S1

S2
S3
S4
S5
S6
S7

S10
S11
S12
S13
S14
S15
S16

PRESET

SLEEP
MULTI

S1
S2
S3
S4
S5
S6
S7
S8

S9
S10
S11
S12
S13
S14
S15
S16

dB

ST
MEM
KHz
MHz

LOGIC 7

C
M

S10
S11
S12
S13
S14
S15
S16

TUNED

VMAx

S1
S2
S3
S4
S5
S6
S7
S8
S9

N
F

S1
S2
S3
S4
S5
S6
S7
S8

S9
S10
S11
S12
S13
S14
S15
S16

TA

AUTO

DSP

S1
S2
S3
S4
S5
S6
S7
S8

S9
S10
S11
S12
S13
S14
S15
S16

RDS
OSD

S1
S2
S3
S4
S5
S6
S7
S8

S9
S10
S11
S12
S13
S14
S15
S16
S17

ANALOG

3

ST

S1
S2
S3
S4
S5
S6
S7
S8

S9
S10
S11
S12
S13
S14
S15
S16

COAX

1
2
3

Ise Electronics Corporation

S1
S2
S3
S4
S5
S6
S7
S8

S9
S10
S11
S12
S13
S14
S15
S16

OPT

1
2
3

S1
S2
S3
S4
S5
S6
S7
S8

S9
S10
S11
S12
S13
S14
S15
S16

DTS

D

HDCD

MP3
PCM PL D

PIN ASSIGNMENT

Pin No.

Assignment F2 NP NL S24 S23 S22 S21 S20 S19 S18 S17 S16 S15 S14 S13 S12 S11 S10 S9 S8 S7 S6 S5 S4 S3 S2

Pin No.

Assignment NL NL NL NL G10 G9 G8 G7 G6 G5 G4 G3 G2 G1 NL NP F1

F1,F2:Filament G1-G10:Grid S1-S24:Anode NP:No Pin NL:No Lead

NL

(F2)

S1

12345678910111213141516171819

NL

(F1)

202122232425262728293031323334353637383940414243444546