Yamaha DSP-A5 Service Manual

AV AMPLIFIER

DSP-A5

SERVICE MANUAL

IMPORTANT NOTICE

This manual has been provided for the use of authorized YAMAHA Retailers and their service personnel. It has been assumed that basic service procedures inherent to the industry, and more specifically YAMAHA Products, are already known and understood by the users, and have therefore not been restated.

WARNING: Failure to follow appropriate service and safety procedures when servicing this product

IMPORTANT:The presentation or sale of this manual to any individual of firm does not constitute

The data provided is believed to be accurate and applicable to the unit(s) indicated on the cover. The research, engineering, and service departments of YAMAHA are continually striving to improve YAMAHA products. Modifications are, therefore, inevitable and specifications are subject to change without notice or obligation to retrofit. Should any discrepancy appear to exist, please contact the distributor's Service Division.

WARNING: Static discharges can destroy expensive components. Discharge any static electricity

IMPORTANT:Turn the unit OFF during disassembly and part replacement. Recheck all work before

may result in personal injury, destruction of expensive components, and failure of the product to perform as specified. For these reasons, we advise all YAMAHA product owners that any service required should be performed by an authorized YAMAHA Retailer or the appointed service representative.

authorization, certification or recognition of any applicable technical capabilities, or establish a principle-agent relationship of any form.

your body may have accumulated by grounding yourself to the ground buss in the unit (heavy gauge black wires connect to this buss).

you apply power to the unit.

■CONTENTS

TO SERVICE PERSONNEL ........................................... 1

REMOTE CONTROL PANELS....................................... 1

REAR PANELS ............................................................... 2

SPECIFICATIONS.......................................................3~4

INTERNAL VIEW ............................................................ 5

DISASSEMBLY PROCEDURES .................................... 5

SELF DIAGNOSIS FUNCTION ................................ 6~17

FACTORY PRESET ...................................................... 18

100712

AMP ADJUSTMENT ..................................................... 19

IC DATA .................................................................. 20~28

DISPLAY DATA ........................................................... 29

BLOCK DIAGRAM.................................................. 30~31

PRINTED CIRCUIT BOARD ...................................32~47

SCHEMATIC DIAGRAM ......................................... 48~53

PARTS LIST ............................................................54~69

REMOTE CONTROL TRANSMITTER ......................... 70

DSP-A5

■ TO SERVICE PERSONNEL

1. Critical Components information Components having special characteristics are marked replaced with parts having specifications equal to those originally installed.

2. Leakage Current Measurement (For 120V Model only) When service has been completed, it is imperative that you verify that all exposed conductive surfaces are properly insulated from supply circuits. Meter impedance should be equivalent to 1500 ohm shunted by 0.15µF.

•

Leakage current must not exceed 0.5mA.

•

Be sure to test for leakage with the AC plug in both polarities.

•

and must be

WALL

OUTLET

EQUIPMENT

UNDER TEST

INSULATING

TABLE

AC LEAKAGE

TESTER OR

EQUIVALENT

WARNING: CHEMICAL CONTENT NOTICE!

The solder used in the production of this product contains LEAD. In addition, other electrical/electronic and/or plastic (where applicable) components may also contain traces of chemicals found by the California Health and Welfare Agency (and possibly other entities) to cause cancer and/or birth defects or other reproductive harm.

DO NOT PLACE SOLDER, ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH FOR ANY REASON WHATSOEVER!

Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale solder fumes or expose eyes to solder/flux vapor!

If you come in contact with solder or components located inside the enclosure of this product, wash your hands before handling food.

■ REMOTE CONTROL PANELS

▼ R and T models ▼ B and G models

DSP INPUT

/DTS

SUR.

MONO MOVIE

DVD/LD

ROCK HALL

PHONO

EXT.DEC. INDEX

TEST

DIR A DIR B

POWER

RAV210

V429760 US

MOVIE

THTR 2

THTR 1

TUNER3TAPE/MD

TV SPORTS

DISCO

D-TV6VCR

CBL/SAT9V-AUX

EFFECT

ENTER >10

A/B/C/D/E

DISC SKIP

PRESET

DISPLAYVCR REC

A/B

SELECT

MENUTITLE

POWER

SET MENUTIME/LEVEL

STANDBY

POWER

INPUT

SLEEP

VOLUMETV VOL

MUTE

CHCH

DSP INPUT

/DTS

MOVIE

SUR.

THTR 1

TUNER3TAPE/MD

MONO MOVIE

TV SPORTS

D-TV6VCR

DVD/LD

ROCK HALL

CBL/SAT9V-AUX

PHONO

EXT.DEC. INDEX

ENTER >10

A/B/C/D/E

DISC SKIP

PRESET

TEST

DIR A DIR B

SELECT

POWER

STANDBY

POWER

INPUT

SLEEP

MUTE

MOVIE THTR 2

DISCO

EFFECT

CHCH

DISPLAYVCR REC

A/B

MENUTITLE

SET MENUTIME/LEVEL

POWER

VOLUMETV VOL

RAV211

V429770 EU

■ REAR PANELS

▼ R model

▼ T model

DSP-A5

▼ B model

▼ G model

DSP-A5

■ SPECIFICATIONS

■AUDIO SECTION

Minimum RMS Output Power Per Channel

(Power Amp. Section)

MAIN L/R, REAR L/R

20Hz to 20kHz, 0.06% THD, 8Ω 70W+70W 1kHz, 0.09% THD, 8Ω 80W+80W

CENTER

20Hz to 20kHz, 0.06% THD, 8Ω 70W 1kHz, 0.09% THD, 8Ω 80W

Maximum Power (EIAJ)

R, T models only

MAIN L/R, REAR L/R

1kHz, 10% THD, 8Ω 105W+105W

CENTER, 1kHz, 10% THD, 8Ω 105W

Dynamic Power Per Channel (IHF)

MAIN L/R 8/6/4/2Ω

90W+90W/110W+110W/135W+135W/160W+160W

DIN Standard Output Power Per Channel

G model only

MAIN L/R, REAR L/R

1kHz, 0.7% THD, 4Ω 110W+110W

CENTER, 1kHz, 0.7% THD, 4Ω 110W

IEC Power

G model only

MAIN L/R, 1kHz, 0.06% THD, 8Ω 75W+75W

Damping Factor (SPEAKER A)

MAIN L/R, 20Hz to 20kHz, 8Ω 80

Input Sensitivity/Input Impedance

PHONO (MM) 2.5mV/47kΩ CD etc. 150mV/47kΩ MAIN L/R (EXTERNAL DECODER) 150mV/47kΩ CENTER 150mV/40kΩ SURROUND L/R 150mV/40kΩ SUB WOOFER 150mV/40kΩ

Maximum Input Signal Level (1kHz)

PHONO (MM), 0.1% THD 100mV CD etc. (EFFECT ON), 0.5% THD 2.2V

Output Level/Output Impedance

REC OUT 150mV/1.2kΩ PRE OUT 2.1V/1.2KΩ SUB WOOFER (MAIN SP : SMALL) 4V/1.2KΩ

Headphone Jack Rated Output/Impedance

CD etc., Input=1kHz, 150mV, RL=8Ω 0.34V/560Ω

Frequency Response(10Hz to 100kHz)

CD etc., MAIN 0/-3dB

RIAA Equalization Deviation

PHONO (MM) 0±0.5dB

Total Harmonic Distortion(20Hz to 20kHz)

PHONO (MM) to REC OUT (1V) 0.02% CD etc.(EFFECT OFF) to MAIN SP OUT(35W/8Ω)

Signal-to-Noise Ratio(IHF-A Network)

PHONO (MM), Input shorted, REC OUT

R, T models 86dB B, G models 81dB

CD etc,(EFFECT OFF), Input shorted, SP OUT

0.06%

99dB

Residual Noise(IHF-A Network)

MAIN L/R, SP OUT 150µV

Channel Separation(Vol. –30dB, EFFECT OFF)

PHONO, Input shorted, 1kHz/10kHz 60dB/55dB CD etc, Input 5.1kΩ terminated, 1kHz/10kHz

60dB/45dB

Tone Control Characteristics

BASS : Boost/Cut ±10dB(50Hz)

: Turnover Frequency 350Hz

TREBLE : Boost/Cut ±10dB(20kHz)

: Turnover Frequency 3.5kHz

Filter Characteristics

MAIN, REAR SP SMALL : H.P.F. fc=90Hz, 12dB/oct. SUB WOOFER : L.P.F. fc=90Hz, 18dB/oct.

■VIDEO SECTION Video Signal Type

R model NTSC/PAL T, B, G models PAL

Video Signal Level 1Vp-p/75Ω S-Video Signal Level Y:1Vp-p/75Ω,C:0.286Vp-p/75Ω Maximum Input Level 1.5Vp-p Signal-to-Noise Ratio 50dB Monitor Output Frequency Response(–3dB) 5Hz~10MHz

■GENERAL Power Supply

R model AC110/120/220/240V, 50/60Hz T model AC220V, 50Hz B, G models AC230V, 50Hz

Power Consumption

R, T models 310W B, G models 300W

Standby Power Consumption

B, G models 0.89W

Maximum Power Consumption

R model only

5CH Simultaneous output, 10% THD 510W

AC Outlet

R, T models, Switched x 3 100W max(Total) B model, Switched x 1 100W max G model, Switched x 2 100W max(Total)

Dimensions(W x H x D) 435 x 151 x 390.5mm

(17-1/8" x 5-15/16" x 15-3/8")

Weight 11.2kg(24Ibs. 11 oz) Accessories Remote Control Transmitter x 1

Battery (size "AAA", "R03") x 4

* Specifications subject to change without notice.

R ......... General model B ......... British model

T.......... China model G ......... European model

R,T models→ GD (Gold model)

•

B model

•

G model

•

→

BL (Black model)

→

BL (Black model) and TI (Titan model)

● DIMENSIONS

WARNING

Do not change the IMPEDANCE SELECTOR switch setting while the power to this unit is on, otherwise this unit may be damaged.

IMPEDANCE SELECTOR

Manufactured under license from Dolby Laboratories. "DOLBY", "AC-3", "PRO LOGIC", and the double-D symbol are trademarks of Dolby Laboratories. Confidential unpublished works. ©1992-1997 Dolby Laboratories. All rights reserved.

Manufactured under license from Digital Theater Systems, Inc. US Pat. No. 5,451,942 and other worldwide patents issued and pending. "DTS", "DTS Digital Surround", are trademarks of Digital Theater Systems, Inc. Copyright 1996 Digital Theater Systems, inc. All rights reserved.

21.5

(7/8")

390.5(15-3/8")

349.5(13-3/4")

19.5 (13/16")

DSP-A5

435(17-1/8")

130(5-3/32")

151(5-15/16")

(27/32")

Units: mm (inch)

DSP-A5

■ INTERNAL VIEW

1 POWER TRANSFORMER 2 P.C.B. POWER (2) 3 P.C.B. POWER (7)

(B,G models only)

4 P.C.B. MAIN (3) 5 P.C.B. POWER (6)

(R,T models only)

6 P.C.B. MAIN (4) 7 P.C.B. POWER (4)

(R,T models only)

8 P.C.B. MAIN (2) 9 P.C.B. MAIN (1) 0 P.C.B. POWER (3) A P.C.B. INPUT (1) B P.C.B. INPUT (4) C P.C.B. INPUT (3) D P.C.B. INPUT (2) E P.C.B. INPUT (5) F P.C.B. POWER (5) G P.C.B. MAIN (5) H P.C.B. OPERATION (3) I P.C.B. OPERATION (1) J P.C.B. MAIN (6) K P.C.B. POWER (1) L P.C.B. OPERATION (2) M P.C.B. DSP

■ DISASSEMBLY PROCEDURES

(Remove parts in disassembly order as numbered.)

1. Removal of Top Cover

Remove 4 screws (1) and 4 screws (2) in Fig. 1.

2. Removal of Front Panel

a. Remove 5 knobs. b. Remove 6 screws (3) in Fig. 1.

Top Cover

Knobs

Front Panel

Fig.1

■

SELF DIAGNOSIS FUNCTION

1. PURPOSE AND OPERATION

The DSP-A5 has a Self Diagnosis Function to locate a faulty part, if any, by inspecting and taking measurements.

There are 12 main items in the diagnostic menu and have sub-menu items as listed below.

DSP-A5

No.

3 4

MAIN MENU

ANALOG THROUGH

DSP THROUGH

AC–3/DTS THROUGH PRO LOGIC

SPEAKERS SET

DISPLAY CHECK (EFFECT OFF)

MANUAL TEST

FACTORY PRESET

AD DATA CHECK

STATUS INFORMATION FROM DSP

EEPROM WRITING FUNCTION

UNIT INFORMATION/ EXIT

SUB-MENU

1. MAIN BYPASS

2. DSP 0dB

1. YSS+SRAM M

2. YSS M

3. DSP FULL BIT

1. STATUS (BINARY FORM)

1. CENTER LARGE

2. EFFECT OFF

1. MAIN : SMALL 0dB

2. MAIN : LARGE 0dB

3. MAIN : LARGE –10dB

4. LFE/BASS : MAIN CENTER : NONE

5. LFE/BASS : MAIN

6. LFE/BASS : SUBWOOFER

7. CENTER : NONE

8. CENTER : SMALL REAR : SMALL

9. FRONT MIX

1. (EFFECT OFF)

2. ALL SEGMENTS TURN OFF

3. ALL SEGMENTS TURN ON

4. ALTERNATE SEGMENTS TURN ON

5. SOFTWARE RELEASE DATE

1. ALL

2. MAIN L

3. CENTER

4. MAIN R

5. REAR R

6. REAR L

7. LFE

1. INHIBIT (Inhibit Memory Initialize)

2. RESERVED (Reserve Memory Initialize)

1. – – –

2. KEY1, KEY2

3. TUNER SIGNAL LEVEL

4. DC PROTECTION

5. PS PROTECTION

1./2. DSP STATUS (1)/(2)

3./4. CHANNEL STATUS (1)/(2)

5./6. BSI0 (1)/(2)

7./8. BSI1 (1)/(2)

9./10. BSI2 (1)/(2)

11./12. BSI3 (1)/(2)

13./14. BSI4 (1)/(2)

15./16. BSI5 (1)/(2)

1. CHECK SUM

MODIFICATION DATA EEPROM DATA

2. WRITING CONFIRMATION

3. START WRITING

1. VERSION and CHECK SUM

2. MODEL TYPE and DESTINATION

3. EXIT

REMOTE CONTROL CODE (KEY)

7A–88 ("1" [DSP mode]) – – –

7A–89 ("2" [DSP mode])

– – – – – –

– – – 7A–8A ("3" [DSP mode])

– – –

7A–8B ("4" [DSP mode]) 7A–8C ("5" [DSP mode]) 7A–8D ("6" [DSP mode]) 7A–8E ("7" [DSP mode])

7A–8F ("8" [DSP mode]) 7A–90 ("9" [DSP mode]) 7A–91 ("0" [DSP mode]) – – –

7A-12 ("ENTER" [DSP mode]) 7A-56 (">10" [DSP mode])

– – – – – – – – – – – –

– – – – – – – – – – – – – – – – – – – – –

– – – – – –

– – – – – – – – – – – – – – –

– – – – – – – – – – – – – – – – – – – – – – – –

– – –

– – – – – –

– – – – – – – – –

DSP-A5

2. BEGINNING AND CANCELLATION

(1) Starting up the function and the display

After starting up, main menu No.1 is selected.

A. How to start diagnostic program

Using the front panel keys of the main unit

Plug in the AC power cord. With the Power OFF,

simultaneously (Step 1), then press the "STANDBY/ON" key (Step 2).

Sub menu No. 1 of the diagnosis main menu No. 1 will start.

FRONT PANEL

hold down the "PROGRAM " and "EFFECT" keys

"STANDBY/ON" key

"EFFECT" key

Step2. Press the "STANDBY/ON" key. Step1. Hold down the "PROGRAM "

and "EFFECT" key simultaneously.

B. Settings for start-up of diagnostic program

The settings used when starting the diagnostic program are as follows.

EFFECT LEVEL :

CHANNEL CENTER R SUR L SUR SWFR LEVEL (dB) 0 0 0 0

"PROGRAM " key

MUTING : OFF

INPUT (VIDEO) : DVD/LD (DVD/LD)

CENTER SPEAKER : LARGE

REAR SPEAKER : LARGE

MAIN SPEAKER : LARGE

LFE/BASS OUT : SWFR

C. Start-up display

The protection history information appears on the front panel display.

● FL display at start-up of diagnostic program

When the diagnostic program has started, the check sum of the main microcomputer or the protection history (*1) is displayed. If the protection function has been activated in the past, the type and voltage value are displayed. After a few seconds the diagnosis function menu will appear.

(*1) If a faulty condition is detected such as excessive current, a bad power supply or excessive amplifier DC offset, the Power will be switched OFF automatically.

Note) For the voltages of the power and DC protection functions, see the diagnosis main menu No. 9, which will be

described later. The protection history will be cleared when "RESERVED" is selected in the diagnosis main menu No. 8 and FACTORY PRESET is engaged.

● Protection history

The following examples show how the protection history is displayed:

DSP-A5

CHK S UM : X X X X X

IPROTECTION

PS PRT : XX%

DC PRT : XX%

Appears when the protection function has not been activated. Displayed the check sum (4-digit, hexadecimal) and the version (one letter) of the main microcomputer.

Appears when the current protection function has been activated. When power is turned on in an abnormal condition, the power relay will come on, protection will operate immediately, and power will turn off.

Appears when the power supply protection function has been activated. For the % value, the voltage at that point is shown by 5V/100%. When power is turned on in an abnormal condition, power will turn off after half a second.

Appears when the power amp DC protection function has been activated. For the % value, the voltage at that point is shown by 5V/100%. When power is turned on in an abnormal condition, power will turn off after two seconds.

(2) Exiting method

The diagnosis function can be exited by any of the following procedures. Take care with the setting of backup memory initialization menu (diagnosis No. 8) when releasing the diagnosis function.

1. Select sub-menu No. 3 "EXIT" of the diagnosis main menu No. 12.

2. Press the "STANDBY/ON" key on the main unit or "STANDBY" key on the remote control to turn Power OFF.

DSP-A5

3. OPERATION AND DISPLAY WHEN STARTING DIAGNOSIS FUNCTION

(1) Selection of diagnostic menu

The diagnostic menu and the sub-menu can be selected by using the front panel keys of the main unit or the remote control unit.

● Selection by using the front panel keys of the main unit

The main menu can be changed cyclically by using the "SET MENU –/+" keys, and the sub-menu, by using the "PROGRAM / " keys. The " " key will increase the main or sub-menu number.

FRONT PANEL

Reverse Forward Reverse Forward

Main menu Sub-menu

● Selection by using the remote control unit

The remote control codes in the menu list (see right column on page 8) correspond to the DSP program, test and effect keys. See the figure on the right.

DSP INPUT

(2) Other functions available while diagnosis function is active

Listed below are the other functions available while the diagnosis function is active.

• Selection of the input (include TAPE MONITOR/EXTERNAL DECODER)

• Effect level control (CENTER, REAR, SUBWOOFER)

• Master volume control

• Muting on/off

• Power on/off

(3) Diagnosis default status

When not otherwise specified, default settings and values in each menu are as follows:

• SPEAKERS : All "LARGE"

• Electronic Volumes : All "0dB"

• DYNAMIC RANGE : MAX

• LFE LEVEL : 0dB (–10dB in AC-3(DOLBY DIGITAL))

• CENTER DELAY : 0ms

/DTS

MOVIE

SUR.

THTR 1

TUNER3TAPE/MD

MONO MOVIE

TV SPORTS

DVD/LD

ROCK HALL

CBL/SAT9V-AUX

PHONO

EXT.DEC. INDEX

A/B/C/D/E

MOVIE

THTR 2

DISCO

D-TV6VCR

EFFECT

ENTER >10

8A 8C

8D 8F

90 12

5691

+ 21 hidden pages