Yamaha DSP-A5 User manual

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
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.
IMPORTANT:The presentation or sale of this manual to any individual of firm does not constitute
authorization, certification or recognition of any applicable technical capabilities,
or establish a principle-agent relationship of any form.
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
your body may have accumulated by grounding yourself to the ground buss in the unit
(heavy gauge black wires connect to this buss).
IMPORTANT:Turn the unit OFF during disassembly and part replacement. Recheck all work before
you apply power to the unit.
100712
AV AMPLIFIER
DSP-A5
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
■CONTENTS 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

1
DSP-A5
■TO SERVICE PERSONNEL
1. Critical Components information
Components having special characteristics are marked !and must be
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.
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
WALL
OUTLET EQUIPMENT UNDER TEST
AC LEAKAGE
TESTER OR
EQUIVALENT
INSULATING
TABLE
D
V
D
/
L
D
DSP INPUT
MOVIE
THTR 1
MONO MOVIE TV SPORTS DISCO
ROCK HALL
EXT.DEC. INDEX EFFECT
/DTS
SUR.
MOVIE
THTR 2
2
TUNER
3
TAPE/MD
1
CD
5
D-TV
6
VCR
4
DVD/LD
8
CBL/SAT V-AUX
7
PHONO
ENTER >10
+
+
--
+
--
0
A/B/C/D/E
POWER
SELECT
AV
DIR A DIR B
DISC SKIP
PRESET
CHCH
A/B
DISPLAYVCR REC
TEST
MENUTITLE
TV
POWER
TV
SLEEP
VOLUMETV VOL
MUTE
INPUT
STANDBY
POWER
I
SET MENUTIME/LEVEL
RAV210
V42 760 US
--
C
O
D
E
S
E
T
D
V
D
/
L
D
DSP INPUT
MOVIE
THTR 1
MONO MOVIE TV SPORTS DISCO
ROCK HALL
EXT.DEC. INDEX EFFECT
/DTS
SUR.
MOVIE
THTR 2
2
TUNER
3
TAPE/MD
1
CD
5
D-TV
6
VCR
4
DVD/LD
8
CBL/SAT V-AUX
7
PHONO
ENTER >10
+
+
--
+
--
0
A/B/C/D/E
POWER
SELECT
AV
DIR A DIR B
DISC SKIP
PRESET
CHCH
A/B
DISPLAYVCR REC
TEST
MENUTITLE
TV
POWER
TV
SLEEP
VOLUMETV VOL
MUTE
INPUT
STANDBY
POWER
I
SET MENUTIME/LEVEL
RAV211
V42 770 EU
--
C
O
D
E
S
E
T

2
DSP-A5
▼ T model
▼B model
▼G model
▼R model
■REAR PANELS

3
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, 8Ω70W+70W
1kHz, 0.09% THD, 8Ω80W+80W
CENTER
20Hz to 20kHz, 0.06% THD, 8Ω70W
1kHz, 0.09% THD, 8Ω80W
Maximum Power (EIAJ)
R, T models only
MAIN L/R, REAR L/R
1kHz, 10% THD, 8Ω105W+105W
CENTER, 1kHz, 10% THD, 8Ω105W
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, 4Ω110W+110W
CENTER, 1kHz, 0.7% THD, 4Ω110W
IEC Power
G model only
MAIN L/R, 1kHz, 0.06% THD, 8Ω75W+75W
Damping Factor (SPEAKER A)
MAIN L/R, 20Hz to 20kHz, 8Ω80
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=8Ω0.34V/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)
0.06%
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
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 5.1kΩterminated, 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
→ BL (Black model)
•G model
→ BL (Black model) and TI (Titan model)

4
DSP-A5
●DIMENSIONS
Units: mm (inch)
21.5
(7/8")
435(17-1/8")
349.5(13-3/4")
390.5(15-3/8")
130(5-3/32")
151(5-15/16")
19.5
(13/16")
21
(27/32")
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 world-
wide patents issued and pending. "DTS", "DTS
Digital Surround", are trademarks of Digital Theater
Systems, Inc. Copyright 1996 Digital Theater
Systems, inc. All rights reserved.

5
DSP-A5
■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.
Fig.1
1POWER TRANSFORMER
2P.C.B. POWER (2)
3P.C.B. POWER (7)
(B,G models only)
4P.C.B. MAIN (3)
5P.C.B. POWER (6)
(R,T models only)
6P.C.B. MAIN (4)
7P.C.B. POWER (4)
(R,T models only)
8P.C.B. MAIN (2)
9P.C.B. MAIN (1)
0P.C.B. POWER (3)
AP.C.B. INPUT (1)
BP.C.B. INPUT (4)
CP.C.B. INPUT (3)
DP.C.B. INPUT (2)
EP.C.B. INPUT (5)
FP.C.B. POWER (5)
GP.C.B. MAIN (5)
HP.C.B. OPERATION (3)
IP.C.B. OPERATION (1)
JP.C.B. MAIN (6)
KP.C.B. POWER (1)
LP.C.B. OPERATION (2)
MP.C.B. DSP
■INTERNAL VIEW
Front Panel
Top Cover
11
11
1
11
11
1
22
22
2
33
33
3
33
33
3Knobs

6
DSP-A5
■ 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.
No.
1
2
3
4
5
6
7
8
9
10
12
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
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. VERSION and CHECK SUM
2. MODEL TYPE and DESTINATION
3. EXIT
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
UNIT INFORMATION/
EXIT
REMOTE CONTROL CODE (KEY)
7A–88 ("1" [DSP mode])
11 1. CHECK SUM
MODIFICATION DATA
EEPROM DATA
2. WRITING CONFIRMATION
3. START WRITING
EEPROM WRITING
FUNCTION –––
–––
–––
–––
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])
–––
–––
–––
–––
–––
–––
–––
–––
–––
–––
–––
–––
–––
–––
–––
–––
–––
–––
4. DC PROTECTION
–––
–––
–––
–––
–––
–––
–––
–––
–––
–––
–––

7
DSP-A5
1.
2.
3.
4.
5.
6.
7.
EFFECT LEVEL :
MUTING : OFF
INPUT (VIDEO) : DVD/LD (DVD/LD)
CENTER SPEAKER : LARGE
REAR SPEAKER : LARGE
MAIN SPEAKER : LARGE
LFE/BASS OUT : SWFR
CHANNEL CENTER R SUR L SUR SWFR
LEVEL (dB) 0 0 0 0
C. Start-up display
The protection history information appears on the front panel display.
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, hold down the "PROGRAM " and "EFFECT" keys
simultaneously (Step 1), then press the "STANDBY/ON" key (Step 2).
Sub menu No. 1 of the diagnosis main menu No. 1 will start.
B. Settings for start-up of diagnostic program
The settings used when starting the diagnostic program are as follows.
"EFFECT" key
"STANDBY/ON" key "PROGRAM " key
FRONT PANEL
Step2. Press the "STANDBY/ON" key. Step1. Hold down the "PROGRAM "
and "EFFECT" key simultaneously.

8
DSP-A5
● Protection history
The following examples show how the protection history is displayed:
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.
● 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.
(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.
CHK S UM : X X X X X
IPROTECTION
PS PRT : XX%
DC PRT : XX%

9
DSP-A5
●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.
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.
(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
FRONT PANEL
Main menu Sub-menu
Reverse Forward Reverse Forward
D
V
D
/
L
D
DSP INPUT
MOVIE
THTR 1
MONO MOVIE TV SPORTS DISCO
ROCK HALL
EXT.DEC. INDEX EFFECT
/DTS
SUR.
MOVIE
THTR 2
2
TUNER
3
TAPE/MD
1
CD
5
D-TV
6
VCR
4
DVD/LD
8
CBL/SAT V-AUX
7
PHONO
ENTER >10
0
A/B/C/D/E
5691
12
90
8F
8D
8C
8A
89
8E
8B
88
7A

10
DSP-A5
4. CONTENTS OF DIAGNOSIS FUNCTION
This section describes the contents of the Self Diagnosis Function in detail.
No.1 ANALOG THROUGH
The input is fixed to analog (A/D). There are two sub-menus.
1. MAIN BYPASS
The L/R signals bypass the digital circuit, and are output to the MAIN L/R.
The L/R signals are output without being processed to the CENTER/SUBWOOFER, FRONT L/R and REAR L/R
through the DSP. (Remote control code 7A-88: "1" key [DSP mode])
: This shows that the device is not operating.
2. DSP 0dB
The L/R signals are output without being precessed to the MAIN L/R through the AC3D2av.
The L/R signals are output without being precessed to the CENTER/SUBWOOFER, FRONT L/R and REAR L/R through
the DSP.
: This shows that the device is not operating.
DIR5
CODEC.DAC
AK4526A
YSD917
CODEC.ADC AC3D2av(YSS918)
AK4526A
DECODER
DOLBY DIGITAL
or
PRO LOGIC
or
DTS
1M SRAM
DSP
ANALOG IN
L/R L/R
DAC
AK4324
FRONT R
REAR L
REAR R
CENTER
SUBWOOFER
L/R
L/R
DIGITAL IN
FRONT L
MAIN R
MAIN L
1M SRAM
ANALOG IN
DIGITAL IN
•INPUT : DVD/LD (Analog signal)
(Lch and Rch, 1KHz, –20dBV)
•OUTPUT : SPEAKERS
MAIN L : 24.0 dBV REAR L : 24.0 dBV
MAIN R : 24.0 dBV REAR R : 24.0 dBV
CENTER: 24.0 dBV
•INPUT : DVD/LD (Analog signal)
(Lch and Rch, 1KHz, –20dBV)
•OUTPUT : SPEAKERS
MAIN L : 24.0 dBV REAR L : 24.0 dBV
MAIN R : 24.0 dBV REAR R : 24.0 dBV
CENTER: 24.0 dBV
1MAIN BYPASS
1DSP 0dB
L/R
DIR5
CODEC.DAC
AK4526A
YSD917
CODEC.ADC AC3D2av(YSS918)
AK4526A
DECODER
DOLBY DIGITAL
or
PRO LOGIC
or
DTS
DSP
L/R L/R
DAC
AK4324
FRONT R
REAR L
REAR R
CENTER
SUBWOOFER
L/R
L/R
FRONT L
MAIN R
MAIN L
L/R

11
DSP-A5
No.2 DSP THROUGH
The input is automatically discriminated by signal detection and switched with priorities Coaxial>Optical>Analog.
There are the following three sub-menus.
1. YSS+SRAM
The L/R signals are output without being processed to the MAIN L/R through the AC3D2av.
The L/R signals are output without being processed to the CENTER/SUBWOOFER through the DSP.
The (L+R)/2 signals are output to the FRONT L/R and REAR L/R through the DSP and the SRAM.
When one of the L/R signals is not input, the output level is –6dB. (Remote control code 7A-89:"2" key [DSP mode])
2. YSS M
Same as "2. DSP 0dB" of "No.1 ANALOG THROUGH", except for the input switching.
3. DSP FULL BIT
Same as the above menu, except that the head margin is disabled, and the digital data is output with full bits from
AC3D2av to DAC.
AC3D2av(YSS918)
1M SRAM
DSP
ANALOG IN
L/R
DIGITAL IN
1M SRAM
: This shows that the device is not operating.
L/R
L/R
(L+R)/2
(L+R)/2(L+R)/2
•INPUT : DVD/LD (Analog signal)
(Lch and Rch, 1KHz, –20dBV)
•OUTPUT : SPEAKERS
MAIN L : 24.0 dBV REAR L : 24.0 dBV
MAIN R : 24.0 dBV REAR R : 24.0 dBV
CENTER: 24.0 dBV
•INPUT : DVD/LD (Analog signal)
(Lch and Rch, 1KHz, –20dBV)
•OUTPUT : SPEAKERS
MAIN L : 24.0 dBV REAR L : 24.0 dBV
MAIN R : 24.0 dBV REAR R : 24.0 dBV
CENTER: 24.0 dBV
•INPUT : DVD/LD (Analog signal)
(Lch and Rch, 1KHz, –30dBV)
•OUTPUT : SPEAKERS
MAIN L : 14.0 dBV REAR L : 23.3 dBV
MAIN R : 14.0 dBV REAR R : 23.3 dBV
CENTER: 17.2 dBV
2 YSS+SRAM M
2 YSS M
2DSP FULL BIT
DIR5
CODEC.DAC
AK4526A
YSD917
CODEC.ADC
AK4526A
DECODER
DOLBY DIGITAL
or
PRO LOGIC
or
DTS
DAC
AK4324
FRONT R
REAR L
REAR R
CENTER
SUBWOOFER
FRONT L
MAIN R
MAIN L
L/R
ANALOG IN
DIGITAL IN
DIR5
CODEC.DAC
AK4526A
YSD917
CODEC.ADC AC3D2av(YSS918)
AK4526A
DECODER
DOLBY DIGITAL
or
PRO LOGIC
or
DTS
DSP
L/R L/R
DAC
AK4324
FRONT R
REAR L
REAR R
CENTER
SUBWOOFER
L/R
L/R
FRONT L
MAIN R
MAIN L
L/R

12
DSP-A5
No.3 AC-3/DTS THROUGH
The input is digital signal only. AC-3 (DOLBY DIGITAL) or DTS Digital Surround decoding operation is executed,
according to the input source.
1. STATUS(BINARY FORM)
AC-3 (DOLBY DIGITAL) decoded signals are output to each channel via AC3D2av.
The AC-3 (DOLBY DIGITAL) signal status data will be displayed in the FL display using a binary number.
AC-3 Status Info. : bit 7 6 5 4 3 2 1 0
(Invalid in DTS) 1 0 0 01001
IEC958 digital data bit
IEC958 commercial-use device bit
IEC958 digital format error
Demodulator muting (without RF signal)
1 for audio other than PCM linear audio
1 during red DTS lock
1 during DTS decode OK
1 during AC-3 decode OK
No.4 PRO LOGIC
The submenu is switched between PRO LOGIC (AUTO BALANCE OFF) and EFFECT OFF.
1. CENTER LARGE
The input is automatically discriminated by signal detection and switched with priorities Coaxial>Optical>Analog.
DTS Digital Surround is disabled. The input signals are PRO LOGIC decoded and output.
(Remote control code 7A-8A: "3" key [DSP mode])
2. EFFECT OFF
The input is only for analog signal. The L/R signals bypass the digital circuit and are output to the MAIN L/R.
AC3D2av(YSS918)
DECODER
DOLBY DIGITAL
or
PRO LOGIC
or
DTS
or
DTS
1M SRAM
DSP
ANALOG IN
REAR L
REAR R
CENTER
SUBWOOFER
DIGITAL IN
LS/RSLS/RS
C/LFEC/LFE
AC3D2av(YSS918)
DECODER
DOLBY DIGITAL
or
PRO LOGIC
1M SRAM
DSP
ANALOG IN
C
S
C
SREAR L
REAR R
CENTER
DIGITAL IN
: This shows that the device is not operating.
•INPUT : DVD/LD (Analog signal)
(Lch and Rch, or Lch only, 1KHz, –20dBV)
•OUTPUT : SPEAKERS
(INPUT : Lch and Rch ) (INPUT : Lch only)
MAIN L : –12.5 dBV MAIN L : 24.0 dBV
MAIN R : –12.5 dBV MAIN R : –19.0 dBV
CENTER: 27.0 dBV CENTER : –10.0 dBV
REAR L : –9.0 dBV REAR L : –9.0 dBV
REAR R : –9.0 dBV REAR R : –9.0 dBV
3 ST:10001001
4PROCNTR:LRG
4PRO EFCT:OFF
DIR5
CODEC.DAC
AK4526A
YSD917
CODEC.ADC
AK4526A
DIR5
CODEC.DAC
AK4526A
YSD917
CODEC.ADC
AK4526A
DAC
AK4324 MAIN R
MAIN L
L/R
DAC
AK4324 MAIN R
MAIN L
L/R
bit 7 bit 1

13
DSP-A5
1 MAIN:SML 0DB 7A-8B LARGE LARGE SMALL 0dB SWFR L R NONE NONE NONE L+R
2 MAIN:LRG 0DB 7A-8C LARGE LARGE LARGE 0dB SWFR L L NONE NONR NONE NONE
3 MAIN:LRG -10 7A-8D LARGE LARGE LARGE -10dB SWFR L L NONE NONE NONE NONE
4 B:MAIN C:NONE 7A-8E NONE LARGE LARGE 0dB MAIN L L NONE NONE NONE NONE
5 LFE/B:MAIN 7A-8F LARGE LARGE LARGE 0dB MAIN
LFE+FL LFE+FR NONE NONE NONE NONE
6 LFE/B:SWFR 7A-90 LARGE LARGE LARGE 0dB SWFR NONE NONE NONE NONE NONE LFE
7 C:NONE 7A-91 NONE LARGE LARGE 0dB SWFR C+L C+R NONE NONE NONE NONE
8 C:S REAR:S –––SMALL SMALL LARGE 0dB SWFR FL FR C RL RR
C+RL+RR+LFE
9 FRONT MIX 7A-12 LARGE LARGE LARGE 0dB SWFR FL FR NONE NONE NONE NONE
No.5 SPEAKERS SET
The input is automatically discriminated by signal detection and switched with priorities Coaxial>Optical>Analog.
The L/R signals are output to channels specified by the sub-menu without being processed.
There are the following nine sub-menus items. Signal routes of the sub-menu 1-4 are the same as EFFECT OFF.
But MAIN L/R are signals through the digital circuit.
Signal routes of the sub-menu 5-9 are the same as "2. YSS M" of "No. 2 DSP THROUGH".
However, only MAIN L/R are output in the sub-menu 1-4.
SUB MENU
CENTER SP
OUTPUTSETTING
LFE/BASS
MAIN
LEVEL
MAIN
LMAIN
RCENTER REAR L
REAR
R
SUB
WOOFER
MAIN SPREAR SP
REMOTE
CONTROL
CODE
SUB MENU DESCRIPTION
1 MAIN:SML 0DB Verification of the High and low pass filter response and gain in the bass redirection mode.
2 MAIN:LRG 0DB Reference of the sub menu No. 1 and 3.
3 MAIN:LRG -10 Verification of the effect in the main level function.
4 B:MAIN C:NONE Verification of the mixing circuit effect to the main channel.
5 LFE/B:MAIN Verification of the bass mix gain.
6 LFE/B:SWFR Verification of the LFE maximum output.
7 C:NONE Verification of the center mix gain.
8 C:S REAR:S Verification of the high and low pass filter response and gain in the bass redirection mode.
9 FRONT MIX Verification of the front mix gain.
LARGE: Mode in which speakers with high bass-sound playback capability (large unit) are used. Full-range signals present
on the channel are output from the speaker.
SMALL : Mode in which speakers with low bass-sound playback capability (small unit) are used. Low bass signals (below
90Hz) on the channel are mixed into the channel selected by the LFE/BASS setting.
NONE: Mode in which center speaker is not used. The center channel signal is reduced by 3 dB and mixed into MAIN L/R.
LFE/B:MAIN
: Mode in which subwoofer speaker is not used. The LFE channel signal is reduced by 4.5 dB and mixed into
MAIN L/R. But because of the phase difference, the MAIN L/R output is not simply summed.
The analog switches in each sub-menu are set as follows:
Description of the submenu as follows:
5MAIN:SML0dB
5 B:MAIN C:NON
5 C:NONE
5MAIN:LRG0dB
5LFE/B:MAIN
5 C : S REAR : S
5MAIN:LRG-10
5 LFE/B:SWFR
5FRONTMIX

14
DSP-A5
No.6 DISPLAY CHECK
Check program for FL display. The display status will change as follows with sub-menu operation.
signal route is the same as "2. EFFECT OFF" of "No. 4 PRO LOGIC".
A defect of the FL drive port and FL display segments can be detected by using "All segments turn off" and "All
segments turn on".
A short-circuit between adjacent segments can be detected by using "Alternate segments turn on" (lattice form).
No.7 MANUAL TEST
By using the noise generator built into the DSP, a test noise outputs to the channel specified by the sub-menu.
No.8 FACTORY PRESET
The initialization of the back-up RAM, which contains, the DSP program, set menu contents, etc. is reserved
or inhibited. Signal route is the same as "2. EFFECT OFF" of "No.4 PRO LOGIC".
1. INHIBITED: Inhibits initialization of the back-up RAM.
Specify this option protect user set values.
2. RESERVED: Reserve to initialization of the back-up RAM.
(The RAM is actually initialized when power
is turned on next time.) Specify this option
at the factory preset or to reset the RAM.
For the contents of the initialization, see page 18.
The protection data is also reset.
6 VFD CHCK
7TESTALL
7TESTMAINR
7TESTLFE
7TESTMAINL
7 TEST REAR R
7 TEST CENTER
7 TEST REAR L
Initial display All segments turn off All segments turn on (See page 29)
(lattice form)
Alternate segments turn onSoftware Release date display
8PRESET INHI
8 PRESET RSRVD

15
DSP-A5
No.9 AD DATA CHECK
The A/D conversion values of the microcomputer which detects key scan port, protection detection port, etc. are displayed
in % (100%:5V). Signal route is the same as "2. EFFECT OFF" of "No. 4 PRO LOGIC".
The keys on the main unit cannot be operated to detect the values of all keys in the K1/K2 and SI.
Operating the "PROGRAM , "key and turning the rotary encoder ("INPUT SELECTOR" on the main unit) will switch the
sub-menu.
Table 1
AD Value 01525354555657585
SET MENU
PROGRAM
INPUT MODE
NEXT
TAPE/MD MON
/EXT DECODER
EFFECT
K1
K2
–+
9 AD DATA CHK
9 K1 : 100K2 : 100
9SI: 0
9DC: 7
9PS: 30
Cautions:
1. If K1 and K2 are more than ±4% from the reference values, normal operation will not be executed.
2. If DC and PS are outside the normal values, the protection function will operate and power will turn off.
Press the "PROGRAM " key.
K1/K2: Panel key on the main unit.
Initial display.
For return to the PS menu, press the "PROGRAM " key.
(See Table 1.)
Turning the "INPUT SELECTOR".
SI: Tuner signal sensitivity level
For return to the K1/K2 menu, press the "PROGRAM "key.
Press the "PROGRAM " key.
DC: DC protection value
(normal value: 1-13)
For return to the SI menu, press the "PROGRAM "key.
Press the "PROGRAM " key.
PS: Power voltage protection value
(normal value: 23-38)
For return to the DC menu, press the "PROGRAM "key.
For return to the initial display, press the "PROGRAM "key again.

16
DSP-A5
No.10 STATUS INFORMATION FROM DSP
The status data from the DSP block is sequentially displayed in a hexadecimal number.
Signal route is the same as "2. EFFECT OFF" of "No. 4 PRO LOGIC".
[CPU/1]
[CPU/2]
<High Byte>
[Note]
When acmod is beyond 1000B, it is DTS 7.1 signal. And the DSP block will be muted.
The acmod of DTS 2/0 is as 0000B:1+1.
<Low Byte>
[Note]
<High Byte>
<Low Byte> Always “00”
[CHS/1,/2] IEC958 channel status bits 00-31 available from DIR5.
<CHS/1 High Byte> bits 00-07
<CHS/1 Low Byte> bits 08-15
<CHS/2 High Byte> bits 16-23
<CHS/2 Low Byte> bits 24-31
[BI0/1,/2] Displays the bit stream information contained in AC-3(DOLBY DIGITAL)/DTS Digital Surround signal from the first byte.
[BI1-5/1,/2] Displays the bit stream information contained in AC-3(DOLBY DIGITAL) signal from the first byte.
bit7 AC3 KARAOKE bit3 1
bit6 DIR2 LOCKN bit2 0
bit5 DIR2 ERR bit1 DSP is AC3D2 (DTS present)
bit4 AC3D MUTE bit0 RF DEM (Demodulator) present
10 CPU/ 1 00 00
10 CHS/ 2 00 00
10 BI2/1 00 00
10 CPU/ 1 00 00
10 BI0/1 00 00
10 BI2/2 00 00
10 CHS/ 2 00 00
10 BI0/2 00 00
10 BI3/1 00 00
10 BI3/2 00 00 10 BI4/1 00 00 10 BI4/2 00 00
10 BI5/1 00 00 10 BI5/2 00 00
bit7 AC-3 DECODE OK bit3 DEM (Demodulator) MUTE
(without RF signal)
bit6 DTS DECODE OK bit2 IEC958 digital format error
bit5 Red DTS record
(Flashes and lights) bit1 IEC958 commercial-use device bit
bit4 1 for audio other than PCM
linear audio bit0 IEC958 digital data bit
bit7 Mute request bit3 acmod
0000B:1+1 0001B:1/0
0010B:2/0 0011B:3/0
0100B:2/1 0101B:3/1
0110B:2/2 0111B:3/2
1000B:7.1
bit6 fs bit2
bit5
000B:Analog 001B:32kHz
010B:44.1kHz 011B:48kHz
100B:64kHz 101B:88.2kHz
110B:96kHz 111B:undefined
bit1
bit4 bit0
IEC958: Standard to identify the PCM bit stream signal. Digital format error refers to a digital signal with the
sampling frequency undefined (neither 32k,44.1k,48k,64k,88.2k nor 96k). Since the operation of each device
cannot be assured at fs outside specifications, this status handled as the forced analog mode (ignored even if
decoding is OK from the detection terminal level), and the signals from the analog input terminal will be
selected. Bits 4-6 of "CPU/1" will be 000B (Analog), and the microcomputer operates in the same way as with
digital unlocking.
Indicate bit
3210
7654
0 0000
1 0001
2 0010
3 0011
4 0100
5 0101
6 0110
7 0111
8 1000
9 1001
A 1010
B 1011
C 1100
D 1101
E 1110
F1 111
bit 7 6 5 4 3 2 1 0
Indicate 0 0
Low
High

17
DSP-A5
12 RX-V ABGL
The version and the check sum of the microcomputer software are displayed.
A01: Microcomputer software version.
824E: Microcomputer software check sum.
The model type and the destination are displayed.
RX-V: Model type.
DSP-A= DSP-A5
RX-V = RX-V596, HTR-5250
RDS = RX-V596RDS
ABGL: Destination.
J = J model
UC = U and C models
ABGL = A,B,G and L models
R = R and T model
EXIT
No.11 EEPROM WRITING FUNCTION
The check sum value confirmation of EEPROM and data writing.
Signal route is the same as "2. EFFECT OFF" of "No. 4 PRO LOGIC".
No.12 UNIT INFORMATION/EXIT
The version of the microcomputer and the check sum, the model type and the destination are displayed.
Signal route is the same as "2. EFFECT OFF" of "No.4 PRO LOGIC".
By the sub-menu operation, the set exits the self-diagnousis mode and returns to the normal operation mode.
12 A01 824E
M:XXXX: The check sum value is displayed when the microcomputer has ROM
modification data.
0000 is displayed when there is no data.
E:XXXX: The check sum value is displayed when the EEPROM is installed on and
it has the ROM data .
000 is displayed when EEPROM is not mounted on or data is unusual.
If you want to write ROM modification data of the microcomputer into the
EEPROM, change to the next sub-menu.
M: XXXX E : XXXX
Version Check sum
Model type Destination

18
DSP-A5
■FACTORY PRESET
All of the system settings are initially set from the factory as follows.
●INPUT SELECTOR ●EFFECT LEVEL
EFFECT CHANNEL PRESET VALUE
CENTER 0 dB
RIGHT SURROUND 0 dB
LEFT SURROUND 0 dB
SUBWOOFER 0 dB
●DSP PROGRAM
No. PROGRAM SUB-PROGRAM DELAY PRESET VALUE
DOLBY/DTS NORMAL PRO LOGIC : 20ms,
SURROUND ENHANCED DOLBY DIGITAL/DTS DIGITAL SUR : 5ms
MOVIE THEATER SPECTACLE 70mm : 23ms, DGTL/DTS : 15ms
1 SCI-FI 70mm : 20ms, DGTL/DTS : 16ms
MOVIE THEATER ADVENTURE
2 GENERAL
4. MONO MOVIE –49ms
5. TV SPORTS –9ms
6. DISCO –40ms
7. ROCK CONCERT –16ms
8. CONCERT HALL –44ms
1.
2.
3. 70mm : 20ms, DGTL/DTS : 15ms
●
SET MENU
No. SET MENU PRESET VALUE
8. DTS LFE OUT LEVEL DTS LFE 0 dB
7. D. RNG CHOICE D-RANGE : MAX
6. D. D. LFE OUT LEVEL D. D. LFE 0 dB
1. CENTER SP SIZE CENTER SP : LRG(LARGE)
2. REAR SP SIZE REAR SP : LARGE
3. MAIN SP SIZE MAIN SP : LARGE
4. BASS OUT MODE BASS OUT : BOTH
5. M. LVL CHOICE MAIN LVL : NRML (NORMAL)
9. C. DELAY CHANGE CENTER DELAY 0ms
11.
10.
INPUT MODE D-TV TV INPUT : AUTO
MEMORY GUARD MEM. GUARD : OFF
12. INPUT MODE CBL/SAT CBL INPUT : AUTO
INPUT FACTORY PRESET PROGRAM
PHONO CONCERT HALL
CD DISCO
TUNER ROCK CONCERT
ROTARY DVD/LD SCI-FI
ENCODER D-TV TV SPORTS
VCR DOLBY NORMAL
V-AUX DOLBY ENHANCED
CBL/SAT ROCK CONCERT
MONITOR TAPE/MD EFFECT OFF
EXTERNAL EXT. DECODER NONE

19
DSP-A5
Confirmation of Idling Current of Main Amplifier
•Right after power is turned on, confirm that the voltage across the
terminals of R688(Main Lch),R690(Main Rch), R692(Center),
R694(Rear Lch), R696(Rear Rch) are between 0.1mV and 10.0mV.
•If it exceeds 10.0mV, open (cut off) R571 (Main Lch), R577 (Main
Rch), R583 (Center), R589 (Rear Lch), R595 (Rear Rch) and
reconfirm the voltage.
•Confirm that the voltage is 0.20mV ~ 15.0mV after 60 minutes.
■AMP ADJUSTMENT
Note)
•If R571, R577, R583, R589 and
R595 have already been cut off
and idling current does not flow,
reconnect R571, R577, R583,
R589 and R595.
•Q521 ~ Q525 are transistors for
temperature correction.
Apply silicone grease to contact
surface with the heat sink.
R571(Lch)
R577(Rch)
R583(Cch)
R589(RLch)
R595(RRch)
R583
R589
Q525
Q523
Q524
Q522
Q521
R692
R696
R595
MAIN (1)
Front Panel
R577
R571
0.1mV ~ 10.0mV
(DC)
R688(Lch)
R690(Rch)
R692(Cch)
R694(RLch)
R696(RRch)
Cut off
R694
R690
R688
POWER (3)
0.1mV ~ 10.0mV
(DC)