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AX-M9000
SERVICE MANUAL
MONAURAL INTEGRATED AMPLIFIER
AX-M9000
Area Suffix
E Continental Europe
GAIN CONTROL
EXT
PHASE SPEAKER PRESENCE PROCESSOR LINE
-180û 1 2 1 2 1 2 3 4 5 6
STANDBY/ON SLEEP EACH MUTE ATT
DOWN UP
AX M9000
MONAURAL INTEGRATED AMPLIFIER
Contents
Safety precautions --------------------------------------------------------1-2
Disassembly method -----------------------------------------------------1-3
Adjustment method -------------------------------------------------------1-10
Description of major ICs -------------------------------------------------1-11~21
COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD.
No.20933
Apr.2001
AX-M9000
1. This design of this product contains special hardware and many circuits and components specially for safety
purposes. For continued protection, no changes should be made to the original design unless authorized in
writing by the manufacturer. Replacement parts must be identical to those used in the original circuits. Services
should be performed by qualified personnel only.
2. Alterations of the design or circuitry of the product should not be made. Any design alterations of the product
should not be made. Any design alterations or additions will void the manufacturer`s warranty and will further
relieve the manufacture of responsibility for personal injury or property damage resulting therefrom.
3. Many electrical and mechanical parts in the products have special safety-related characteristics. These
characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily
be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which
have these special safety characteristics are identified in the Parts List of Service Manual. Electrical
components having such features are identified by shading on the schematics and by ( ) on the Parts List in
the Service Manual. The use of a substitute replacement which does not have the same safety characteristics
as the recommended replacement parts shown in the Parts List of Service Manual may create shock, fire, or
other hazards.
4. The leads in the products are routed and dressed with ties, clamps, tubings, barriers and the like to be
separated from live parts, high temperature parts, moving parts and/or sharp edges for the prevention of
electric shock and fire hazard. When service is required, the original lead routing and dress should be
observed, and it should be confirmed that they have been returned to normal, after re-assembling.
5. Leakage currnet check (Electrical shock hazard testing)
After re-assembling the product, always perform an isolation check on the exposed metal parts of the product
(antenna terminals, knobs, metal cabinet, screw heads, headphone jack, control shafts, etc.) to be sure the
product is safe to operate without danger of electrical shock.
Do not use a line isolation transformer during this check.
Plug the AC line cord directly into the AC outlet. Using a "Leakage Current Tester", measure the leakage
current from each exposed metal parts of the cabinet, particularly any exposed metal part having a return
path to the chassis, to a known good earth ground. Any leakage current must not exceed 0.5mA AC (r.m.s.).
Alternate check method
Plug the AC line cord directly into the AC outlet. Use an AC voltmeter having, 1,000 ohms per volt or more
sensitivity in the following manner. Connect a 1,500 10W resistor paralleled by a 0.15 F AC-type capacitor
between an exposed metal part and a known good earth ground. AC VOLTMETER
Measure the AC voltage across the resistor with the AC (Having 1000
voltmeter. ohms/volts,
or more sensitivity)
Move the resistor connection to eachexposed metal part,
particularly any exposed metal part having a return path to
0.15 F AC TYPE
the chassis, and meausre the AC voltage across the resistor.
Now, reverse the plug in the AC outlet and repeat each Place this
probe on
measurement. voltage measured Any must not exceed 0.75 V each exposed
AC (r.m.s.). This corresponds to 0.5 mA AC (r.m.s.). 1500 10W metal part.
Good earth ground
!
1. This equipment has been designed and manufactured to meet international safety standards. Burrs formed during molding may
2. It is the legal responsibility of the repairer to ensure that these safety standards are maintained. be left over on some parts of the
3. Repairs must be made in accordance with the relevant safety standards. chassis. Therefore, pay attention to
4. It is essential that safety critical components are replaced by approved parts. such burrs in the case of
5. If mains voltage selector is provided, check setting for local voltage. preforming repair of this system.
In regard with component parts appearing on the silk-screen printed side (parts side) of the PWB diagrams, the
parts that are printed over with black such as the resistor ( ), diode ( ) and ICP ( ) or identified by the " "
mark nearby are critical for safety.
When replacing them, be sure to use the parts of the same type and rating as specified by the manufacturer.
(Except the JC version)
1-2
AX-M9000
Disassembly method Metal cover
Removing the metal cover (See Fig. 1)
1. Remove the three screws A attaching the metal
cover on the back of the body.
2. Remove the four screws B attaching the metal cover
on both sides of the body using a hexagon wrench.
3. Draw the metal cover upward from the behind while B 2
pulling the both sides of the lower part of the metal A
cover outward. B 2
Fig.1
Top plate C
Removing the front panel assembly
(See Fig. 2 to 5)
Prior to performing the following procedure, remove
the metal cover.
1. Remove the six screws C attaching the top plate
using a hexagon wrench.
2. Remove the six screws D and tow screws D'
attaching the front panel assembly from the back of
the body.
3. Remove the four screws E attaching the front panel
assembly from the upper part of the body.
4. Remove the four screws F attaching the front panel
assembly on both sides of the body. Fig.2
5. Disconnect the harness from the connectors CN601,
CN602, CN603, CN604 and CN605 of the system E
control board assembly.
6. Remove the screw G attaching the earth wire.
* The front panel assembly of this machine
comprises the three sets - the front panel
(left), front panel (right) and sub-panel (center).
Front panel assembly D Front panel
F 2 F 2 assembly
Fig.4
D' System control board assembly G Earth wire
CN602 CN601 CN605
CN603 CN604
Fig.3 Fig.5
1-3
AX-M9000
Removing the rear panel (See Fig.6 to 9)
Prior to performing the following procedure, remove
the metal cover and front panel assembly.
1. Remove the four screws H attaching the rear panel
on the back of the set.
2. Remove the eight screws I attaching the rear panel
on the upper part of the set.
3. Remove the six screws J, two screws K, nine screws (Bottom)
L and one screw M attaching the rear panel.
4. Draw the rear panel upward from the behind at the
legs while pulling the rear panel outward. H
Fig.6
5. Remove the four screws N attaching the speaker
output cord.
* If necessary, remove the power plug, connector
clamp, etc.
I I
Fig.7
Rear panel M L K
J
J
L J
Fig.8
Rear panel N N
Fig.9
1-4
AX-M9000
Removing the control switch board Front panel (right) Sub-panel Front panel (left)
assembly 1 & 2 and display board O
O P
assembly (See Fig.10 to 11)
Prior to performing the following procedure, remove
the metal cover and front panel assembly.
1. Remove the ten screws O attaching the control
switch board assembly 1 & 2 on the back side of the Control switch board (1)
Control switch board (2)
front panel assembly (left & right sides). Metal base
2.
Remove the four screws P attaching the metal base Fig.10
on the backside of the sub-panel assembly (center).
Q
3. Remove the four screws Q on the backside of the
metal base. Then the display board assembly can be
removed.
Metal base
Display board
Fig.11
Removing the system control board
assembly (See Fig. 12)
Prior to performing the following procedure, remove
the metal cover and front panel assembly.
1. Remove the four screws R attaching the system
control board assembly.
2. Disconnect the connectors CN611, CN612, CN613,
CN614, CN615 and CN616.
System control board assembly
R
CN611
CN614
CN613 CN616 R CN612 CN615
Fig.12
1-5
AX-M9000
Power AMP board TB402
TB401 CN453
CN402
CN401
S
TB403
TB404
Signal
processing
board
U
CN301 T 11
Heat sink cover
Fig.13
Removing the power AMP board
assembly / heat sink (See Fig. 13 to 15)
Prior to performing the following procedure, remove
the metal cover, system control assembly and rear
cover.
1. Remove the six through bolts S attaching the heat
sink and the heat sink cover.
Power AMP sub-board
2. Remove the eleven screws T attaching the power assembly (1) (2) Heat sink
AMP sub-board assembly.
Fig.14
3. Disconnect the harness, which is extending from
power transformer, from the connectors TB401,
TB402, TB403 and TB404.
V
4. Disconnect the harness, which is extending from the
power transformer for pre-AMP, from the connectors
CN401 and CN402.
5. Disconnect the harness, which is extending from the
fan, from the connector CN453.
6. Disconnect the harness, which is extending from the
signal processing board, from the connector CN301.
7. After removing each screw U attaching the power
AMP sub-board assembly (1) & (2), take off the
power AMP sub-board assembly from the heat sink.
8. Remove the seven screws V attaching transistor
Q335~Q340. Power AMP board Transisitor Q335~Q340.
Fig.15
1-6
AX-M9000
Removing the current mode source Current mode source selector board assembly
selector board assembly and rear
terminal panel (See Fig. 16)
Prior to performing the following procedure, remove
the metal cover and the rear panel.
1. Remove the six screws W attaching the RCA pins on
the current mode source selector board assembly.
Then, the current mode source selector board can
be removed.
2.
Remove the four screws X attaching the cannon
connector on the signal processing board.
W
Rear terminal panel
3. Then, the rear terminal panel can be removed.
X
Fig.16
Y
Removing the signal processing board
assembly (See Fig. 17)
Prior to performing the following procedure, remove
the metal cover and the rear panel. Y
1. Remove the current mode source selector board
assembly and the rear terminal panel.
2. Remove the five screws Y attaching the signal
processing board assembly.
3. Remove the connectors CN251 and CN252.
Signal processing board
Fig.17
Removing the power switch board
assembly (See Fig. 18)
Prior to performing the following procedure, remove
the metal cover.
Z
Power
1. Remove the four screws Z attaching the power
switch
switch board assembly. board
2. Remove the cable connecting to the transformer.
Fig.18
1-7
AX-M9000
Removing the core transformer
for pre-AMP (See Fig. 19)
Prior to performing the following procedure, remove
the metal cover.
1. Remove the two screws A attaching the power A
transformer for pre-AMP.
Power transformer
for pre-AMP
Removing the transformer
for power AMP (See Fig. 20) Fig.19
Prior to performing the following procedure, remove
the metal cover and the front panel assembly.
Power transformer for power AMP
1. Remove the four screws B attaching the power
transformer for power AMP.
B
Fig.20
1-8
AX-M9000
Arrangement drawings for the clamp binding
In order to secure the performance of the machine, refer to the following arrangement drawings
when the lines are clamped.
CLAMP
Orange, Blue wire
CN insertion
Gray wire
Red, Black wire
Black wire CN insertion
Purple wire
Red wire Yellow, Brown wire S CLAMP
CN insertion White wire
Red wire
S CLAMP
White wire 2
Red wire 2
S CLAMP
Red wire 2
Fig 1. Black wire S CLAMP
White RED wire
Brown wire
WR103 WR104
CLAMP
WR102
CLAMP
CLAMP
13P
8P
12P
Fig 2.
1-9
AX-M9000
Adjustment method
1. List of measuring devices
Measuring devices : Electronic voltmeter
Oscilloscope
Low-frequency transmitter (50Hz-20 kHz of transmitting frequency and output of 0
dBs at the 600 terminal)
Distortion factor tester (with a built-in band path filter)
2. Adjustments and confirmation
Description Adjusting method Standard value Remarks
Standard 1) INPUT LINE1 - Output at the time of THD0.5% at f=1kHz More than
output 210W/8 (41.0V)
Total distortion 1) INPUT LINE1 - Distortion factor at the time of 20Hz Less than 0.04%
factor 200W (40.0V) at 8 load 1kHz Less than 0.04%
20kHz Less than 0.06%
Output level 1) Output level at the time when inputting 1kHz 200mV 192mV +/- 10mV
to LINE 1
Hum noise 1) Line 1 Input short Less than 10mV
2) Base hum Volume min. Less than 0.4mV
Frequency 1) Line 1 100Hz Vol. 99. 5 45.6dB 1dB
characteristics 1kHz Vol. 99. 5 45.6dB 1dB
33.4dB 1dB ATT ON
Vol. 69. 5 31.0dB 1dB
Vol. 44. 0 5.8dB 1dB
10kHz Vol. 99. 5 45.6dB 1dB
AC voltage of 1) No signal, no load, Vol. 0.0 Less than +/- 1mV
speaker terminal
Adjustments of 1) Prior to turning the power on, turn the R398
idling currency counterclockwise fully
2) After connecting the 3 pin and 4 pin of the CN303 to the
electronic voltmeter, adjust the voltage to 2-3mV.
3) After elapsing five minutes, adjust the voltage to
3.5+/-0.5mV. Since there is backlash, thoroughly adjust it.
4) After elapsing two minutes, make sure that the voltage
falls within 3.5-7mV. In case where the voltage does not
fall within the specified value, readjust it to the values
specified in 3) above.
Confirmation of 1) No signal, no load, rated power Five minutes later
idling currency Confirm under the room temperature of 20-25 after turning the
power on
Crosstalk 1) INPUT LINE 1 - The output at the Line1 100Hz More than 70dB
input terminal side shall be +20dBm to 1kHz More than 70dB
as a standard. Line2
10kHz More than 70dB
Line1 100Hz More than 70dB
to 1kHz More than 70dB
Line5 10kHz More than 70dB
The CH to be measured shall be terminated at 10k
1-10
AX-M9000
Description of major ICs
BU2114F-X (IC542,543,544) : LED controller
1. Pin layout
SIN 1 18 VDD
CK 2 17 01
LATCH 3 16 02
SOUT 4 15 03
EN 5 14 04
RST 6 13 05
GND 7 12 06
GND 8 11 07
GND 9 10 08
2. Pin function
Pin No. Symbol I/O Function
1 SIN I Serial data input terminal
2 CK I Shift lock of the shift register
3 LATCH I When this terminal is set at "L", the latch output will be secured,
In addition, when the output of the shift register is changed during
"H", the latch output will be changed simultaneously.
4 SOUT O Output of the shift register at the final stage
5 EN I Enable terminals of 01 to 08
6 RST I Reset of the shift register and latch
7 GND - Ground
8 GND - Ground
9 GND - Ground
10 08 O Output of the shift register at the 8th stage
11 07 O Output of the shift register at the 7th stage
12 06 O Output of the shift register at the 6th stage
13 05 O Output of the shift register at the 5th stage
14 04 O Output of the shift register at the 4th stage
15 03 O Output of the shift register at the 3rd stage
16 02 O Output of the shift register at the 2nd stage
17 01 O Output of the shift register at the 1st stage
18 VDD - Power supply
1-11
AX-M9000
MN101CP10A(IC521) : System controller
1.Pin layout 64
~ 49
1 48
~
~
16
32 33
17
~
2. Pin function
Pin No. Symbol I/O Pin function Pin No. Symbol I/O Pin function
1 KY10 (DOWN) I Key input 10 32 ROT1 I Rotary input 1
2 KY11 (LINE) I Key input 11 33 C O Line decoder C
3 KY12 (MUTE) I Key input 12 34 B O Line decoder B
4 TMP IN1 I Temperature detect 1 35 A O Line decoder A
5 TMP IN2 I Temperature detect 2 36 POWER O Power SW
6 VREF+ AD reference voltage 37 ABS O Absolute phase SW
terminal 5.0V
38 MONPRO O MON/ PRO SW
7 VDD 2.0 5.0V supply 39 ALLEACH O All each (LED)
8 OSC2 O Clock out 40 PRESEN1 O Presence SW1
9 OSC1 I Clock in 41 PRESEN2 O Presence SW2
10 VSS 0.0V supply 42 SPKB O Speaker B
11 XI I GND 43 SPKA O Speaker A
12 XO O Open 44 FANH O Fan control High
13 MMOD I Memory extended mode 45 GM1 O GM volume output 1
14 SADATO O SA data out 46 GM2 O GM volume output 2
15 SADATI I SA data in 47 HPS O HPS filter SW
16 SACLK O SA clock 48 LRST O Serial/ Parallel IC reset
17 SBDATO O SB data out 49 FANL O Fan control LOW
18 SBDATI I SB data in 50 LDATO O Serial/ Parallel IC out data
19 SBCLK I SB clock 51 LCLK O Serial/ Parallel IC clock
20 SREQO O Request for the communication 52 LACH O Latch
output between the sets
53 B.CON O Brightness control
21 RST I Reset terminal 54 RM O Remote control input
22 VOLCS O VOL. CS 55 KY1 (HPS) I Key input 1
23 VOLCLK O VOL. clock 56 KY2 (EACH) I Key input 2
24 VOLDATO O VOL. out 57 KY3 (PRO) I Key input 3
25 ATT O Input ATT 58 KY4 (PRE) I Key input 4
26 MUTE LED O Mute LED 59 KY5 (SP) I Key input 5
27 M.WAKE I Return form the stop mode 60 KY6 (PHASE) I Key input 6
28 SREQI I Request for the communication 61 VSS (GND)
output between the sets
62 KY7 (POWER) I Key input 7
29 INH I INM 63 KY8 (ATT) I Key input 8
30 ROT3 I Rotary input 3 64 KY9 (UP) I Key input 9
31 ROT2 I Rotary input 2
1-12
AX-M9000
NJM2903M-XE(IC454) : Temperature detector
1. Pin layout
A OUTPUT 1 8 V+
A -INPUT 2 7 B OUTPUT
A +INPUT 3 6 B -INPUT
GND 4 5 B +INPUT
(TOP VIEW)
2. Block diagram
V+
Q110
Q109 Q111 Q112 Q8
Q7
D103 D104
D101
D102 Q1
Q103 Q104
+INPUT Q101 Q102 Q4 Q3
Q108 Q5
-INPUT
Q107 R1
Q105 Q106 Q6 Q2
GND
OUTPUT
1-13
AX-M9000
NJM5532M-D-W(IC152,153) : Presence circuit amp
1. Pin layout
1 8 V+
A OUT
A - IN 2 7 B OUT
A + IN 6
B - IN
3
4 5
V- B + IN
2. Block diagram
V+
+INPUT
INPUT
OUTPUT
V
1-14
AX-M9000
OPA134PA(IC108, 201, 301) : OP Amp.
Pin layout
Offset Trim 1 8 Offset Trim
- In 2 - 7 V+
+ In 3 + 6 Output
V- 4 5 NC
8-Pin DIP, SO-8
TC74HC04AF(IC264) : Data line buffer
Pin layout
1A 1 14 Vcc
1Y 2 13 6A
2A 3 12 6Y A Y
2Y 4 11 5A
L H
3A 5 10 5Y
3Y 6 9 4A H L
GND 7 8 4Y
(TOP VIEW)
1-15
AX-M9000
TC74HC238AF-X(IC525) : Line recorder
1. Pin layout
A 1 16 Vcc
B 2 15 Y0
C 3 14 Y1
G2A 4 13 Y2
G2B 5 12 Y3
G1 6 11 Y4
Y7 7 10 Y5
GND 8 9 Y6
(TOP VIEW)
2. Truth table
INPUTS OUTPUTS
ENABLE SELECT SELECTED OUTPUT
Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
G1 G2A G2B C B A
L X X X X X L L L L L L L L NONE
X H X X X X L L L L L L L L NONE
X X H X X X L L L L L L L L NONE
H L L L L L H L L L L L L L Y0
H L L L L H L H L L L L L L Y1
H L L L H L L L H L L L L L Y2
H L L L H H L L L H L L L L Y3
H L L H L L L L L L H L L L Y4
H L L H L H L L L L L H L L Y5
H L L H H L L L L L L L H L Y6
H L L H H H L L L L L L L H Y7
X : Don't Care
3. Block diagram
15
Y0
14 Y1
1
A 13
Y2
12
Y3
SELECT 2
B DATA
INOUT OUTPUTS
11
Y4
3 10
C Y5
9
Y6
7
Y7
G2A 4
ENABLE G2B
5
INPUTS
G1 6
1-16
AX-M9000
TC74HC27AF-W(IC531) : Noa gate
1. Pin layout
2. Truth table
1A 1 14 Vcc A B C Y
1B 2 13 1C H X X L
2A 3 12 1Y X H X L
2B 4 11 3C X X H L
2C 5 10 3B L L L H
2Y 6 9 3A X : Don't Care
GND 7 8 3Y
(TOP VIEW)
TC74VHC08F-X(IC281) : Dataline buffer
1. Terminal layout 2. Truth table
A B Y
1A 1 14 Vcc L L L
1B 2 13 4B L H L
1Y 3 12 4A H L L
2A 4 11 4Y H H H
2B 5 10 3B X : Don't Care
2Y 6 9 3A
GND 7 8 3Y
(TOP VIEW)
1-17
AX-M9000
TC74HC373HF-X(IC522, IC523, IC524) : Shift register for relay control
2. Truth table
1. Pin layout
INPUTS OUTPUTS
OE 1 20 Vcc OE LE D Q
Q0 2 19 Q7 H X X Z
D0 3 18 D7 L L X Qn
D1 4 17 D6 L H L L
Q1 5 16 Q6 L H H H
Q2 6 15 Q5 X : Don't Care
Z : High impedance
D2 7 14 D5
Qn: The Q output level immediately
D3 8 13 D4 before the LE becomes to "L".
Q3 9 12 Q4
GND 10 11 LE
(TOP VIEW)
3. Block diagram
D0 D1 D2 D3 D4 D5 D6 D7
3 4 7 8 13 14 17 18
D D D D D D D D
Q Q Q Q Q Q Q Q
L L L L L L L L
LE
OE
2 5 6 9 12 15 16 19
Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7
1-18
AX-M9000
TC74VHC123AF-X(IC532) : Monostable multivibrator
1. Pin layout
1A 1 16 Vcc
1B 2 15 1Rx/Cx
1CLR 3 14 1Cx
1Q 4 13 1Q
2Q 5 12 2Q
1Cx 6 11 2CLR
2Rx/Cx 7 10 2B
GND 8 9 2A
(TOP VIEW)
2. Block diagram VCC Vref Vref
L H
C2 +
-
-
QP +
RX/CX
QN
CX
VCC
A DR Q
F/F
B CK Q
Q
Q
CLR
trr
3. Timing diagram
VIH
A
VIL
VIH
B
VIL
VIH
CLR VIL
VCC
RX/CX VrefH
VrefL
GND
VOH
Q
VOL
VOH
Q
VOL
tw OUT tw OUT tw OUT+ trr
1-19
AX-M9000
UPC1237HA (IC453) : Protection IC
1. Pin layout
1 2 3 4 5 6 7 8
2. Block diagram
3 8
D7
Q15
R26
R4 R9
D6
D1
Q20 R17 R22
Q6 R21
6
R5 R6
Q17
R18 Q18
Q4 R24
Q9 Q13
D4 R19 R27
R10 R13 R16 Q12 Q14
D2 R25
2 Q8 Q10 R20 Q16 Q19
Q1 Q5 R14 R15
R28
D3
Q7 Q11
R11
R3
1 4 7 5
Q2
1-20
AX-M9000
VC5022-2(IC302) : Advanced super A
Block diagram
1
R1
1.6k
9
Q1
2
Q10
3
8
Q2 R8 Q9
R3
1.6k 220 7
4 R7
1.6k
6
Q3 Q5
Q6 Q7 Q8
R4 R5
51 51 R6
R2 51
Q4 220
5
1-21
1
2
4
5
3
Advanced Gm Volume
A
LINE 1 V/I
Con V/I Curent Invert (+ch)
Con
(+ch)
LINE 2 Presence
V/I Vol Cont. Imp A
Con
Block diagram
Input Gm Input Gm Advanced
GmR
(+ch) (-ch) Super A
LINE 3 V/I
Con Presence
Imp B
LINE 4 V/I GmR
B
Con
(-ch)
Vol Cont.
Curent Invert (-ch)
LINE 5 V/I
SPK 1
Con SPK
DC Servo RY
SPK
LINE 6 V/I RY
Con SPK 2
Volume Relay
MJ Indicator Disply Driver Rectifire(3)
C
Send Luch for
Output Output Stage
ID AVR
Bal Unbal AVR AC
Select for Rectifire
Convert com for Primary Main AC Lines
RY for
EXT Processor Pre driv Section
Reset Fan Drive Stage
Inhibit
ON/OFF
MJ RM Inrush
Input V/I Reciv Reciv AVR AVR AVR AVR
Sleep
Con Thermal for for for for
Cont.
I/V Digital Function AD Gm
Key Input Thermal
Compa. Thermal Convert Vol Cont OpAmp Volume
D
AX-M9000
2-1
AX-M9000
Standard schematic diagrams
System control section
QGA2001C1-10
CN501
CN601
ALL_L
PRO_L
ABS_L
PWR_L