Yamaha Audiogram 6 User manual

SERVICE MANUAL
HAMAMATSU, JAPAN
Copyright (c) Yamaha Corporation. All rights reserved. PDF
&
’08.07
SPECIFICATIONS（総合仕様）.................................................3
PANEL LAYOUT（パネルレイアウト）......................................4
DIMENSIONAL DIAGRAM（寸法図）........................................5
CIRCUIT BOARD LAYOUT（ユニットレイアウト）.................5
DISASSEMBLY PROCEDURE（分解手順）..............................6
LSI PIN DESCRIPTION（LSI 端子機能表）...............................9
IC BLOCK DIAGRAM（IC ブロック図）..................................10
CIRCUIT BOARDS（シート基板図）.......................................11
INSPECTIONS（検査）.......................................................14/19
RECORDINGUSINGTHECUBASEAI4
（CubaseAI4 を使用しての録音）......................................24/29
RECORDINGUSINGTHETWE
（TWE を使用しての録音）..................................................34/37
PARTS LIST
BLOCK DIAGRAM（ブロックダイアグラム）
CIRCUIT DIAGRAM（回路図）
CONTENTS（目次）
USB AUDIO INTERFACE
SY 011919
20080801 オープンプライス

AUDIOGRAM6
2
WARNING
Components having special characteristics are marked and must be replaced with parts having specification equal to those
originally installed.
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 all service required should be performed by an authorized Yamaha Retailer or the
appointed service representative.
IMPORTANT : This presentation or sale of this manual to any individual or firm does not constitute authorization certification,
recognition of any applicable technical capabilities, or establish a principal-agent relationship of any form.
The data provided is belived 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 changes in
specification 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 bus in the unit (heavy gauge black wires connect to this bus.)
IMPORTANT : Turn the unit OFF during disassembly and parts replacement. Recheck all work before you apply power to the unit.
WARNING: This product contains chemicals known to the State of California to cause cancer, or birth defects or other reproductive harm.
DO NOT PLACE SOLDER, ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH FOR ANY REASON WHAT SO EVER!
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.
印の部品は、安全を維持するために重要な部品です。交換する場合は、安全のために必ず指定の部品をご使用ください。
MIC/INST端子（XLRタイプ）のピン配列は、以下のとおりです。
（IEC60268規格に基づいています）
1:グラウンド（GND）、2:ホット（＋）、3:コールド（−）） 3
21
MIC/INST jacks (XLR-type) are wired as follows (IEC60268 standard):
pin 1: ground, pin 2: hot (+), and pin 3: cold (-).

3
AUDIOGRAM6
SPECIFICATIONS（総合仕様）
Jacks MIC/INST Input Jack x 2 Combo jacks (Mic/HiZ)
LINE Input Jacks (L, R) x 2 Phone jacks
PHONES Jack x 1 Phone jack
STEREO OUT Jacks (L, R) x 1 Phone jacks
USB Connector x 1 USB 1.1 44.1/48 kHz, 16 bit
Controls MIC/INST Switch x 2 MIC: for microphones
INST (Hi-Z): for guitars, etc.
GAIN Control x 4 Gain for CH 1-5/6
COMP Control x 2 Compressor for CH 1, 2
MONO/STEREO Switch x 1 MONO: CH 1, 2 signals function as independent mono channels.
STEREO: CH 1, 2 signals function as a stereo pair.
LEVEL Control x 4 Adjust the level of CH 1-5/6
PHANTOM +48V Switch x 1 48 V, only for CH1
DAW Control x 1 Adjusts the DAW playback signal
MASTER LEVEL Control x 1 Adjusts the overall signal
Indicators Level Indicators x 1 2 points (green, red)
PEAK Indicator x 4 Red
Phantom Power x 1 Red
Power x 1 Green
Power Supply USB bus-powered
Dimensions (W x H x D) 170 x 59 x 192 mm
Net Weight 760 g
Included Accessories Cubase AI 4 DVD-ROM
USB cable
Owner’s Manual
General Specifications

AUDIOGRAM6
4
PANEL LAYOUT（パネルレイアウト）
qMIC/INST Input Jack
wLINE Input Jacks (L (MONO)/R)
eSTEREO OUT Jacks
rPHONES Jack
tMIC/INST Switch
yGAIN Control
uCOMP Control
iMONO/STEREO Switch
oPEAK Indicators
!0 LEVEL Controls
!1 POWER Indicator
!2 PHANTOM +48V (CH1) Switch/Indicator
(only for channel 1)
!3 Level Indicators
!4 DAW Control
!5 MASTER LEVEL Control
!6 USB Connector

/4 )
1





-

2
*
6
0
q MIC/INST 入力端子
wLINE入力端子(L(MONO)/R)
eSTEREOOUT 出力端子
rPHONES 端子
tMIC/INST 切り替えスイッチ
yGAIN コントロール
uCOMP コントロール
iMONO/STEREO 切り替えスイッチ
oPEAK インジケーター
!0 LEVEL コントロール
!1 POWER インジケーター
!2 PHANTOM+48V(CH1)スイッチ / インジケーター
 ( チャンネル 1 のみ )
!3 レベルインジケーター
!4 DAW コントロール
!5 MASTERLEVEL コントロール
!6 USB 端子

5
AUDIOGRAM6
CIRCUIT BOARD LAYOUT（ユニットレイアウト）
MAIN6
PSUSB
TOP COVER ASSEMBLY
<Bottom view>
（トップカバーAssy）
DIMENSIONAL DIAGRAM（寸法図）
56
51
W: 170
D: 192
3
H: 59
38
Unit: mm

AUDIOGRAM6
6
DISASSEMBLY PROCEDURE（分解手順）
1. Bottom Cover Assembly
(Time required: About 1 minute)
1-1 Remove the five (5) screws marked [110]. The bottom
cover assembly can then be removed. (Fig. 1)
2. PSUSB & MAIN6 Circuit Boards
(Time required: About 7 minutes each)
2-1 Pull out the five (5) level knobs marked [130] from the
control panel side. (Fig. 2)
2-2 Remove the bottom cover assembly.
(See procedure 1.)
2-3 Remove the four (4) screws marked [80] and two (2)
screws marked [90]. (Fig. 3)
2-4 Unhook the MAIN6 circuit board from the seven (7)
hooks marked [A]. The shield main and the MAIN6 cir-
cuit board on which the PS-USB assembly is installed
can then be removed. (Fig. 3, Photo 1)
2-5 Remove the two (2) screws marked [70]. The PS-USB
assembly with the cover PS-USB can then be removed
from the shield main. (Fig. 4)
2-6 PSUSB Circuit Board
2-6-1 Unsolder the four (4) hooks marked [B] from the
PSUSB circuit board and turn the hooks until they are
in the same direction as the notches on the circuit board
to separate the PSUSB circuit board and shield PS-
USB. (Photo 2)
* To remove the cover PS-USB on the shield PS-USB,
detach the two adhesive tapes carefully. (Fig. 5)
[110]: BIND HEAD B-TIGHT SCREW （Bタイト＋ BIND）

3.0X8 MFZN2W3 (WE774300)
Fig. 1（図 1）
[110]
< Bottom view（底から見た図）>
BOTTOM COVER ASSEMBLY
（ボトムカバーAssy） [130] x5
Fig. 2（図 2）
1. ボトムカバー Ass'y（所要時間：約 1 分）
1-1 [110] のネジ 5 本を外して、ボトムカバー Ass'y を
外します。（図 1）
2. PSUSBシート、MAIN6 シート
（所要時間：各約 7 分）
2-1 コントロールパネル面より [130] のノブ LEVEL
 5 個を抜いておきます。（図 2）
2-2 ボトムカバー Ass'y を外します。（1 項参照）
2-3 [80]のネジ4 本と[90] のネジ2本を外します。（図 3）
2-4 MAIN6 シートを [A] のフック（7 箇所）から外して、
シールドメインと PS-USBAss'y が載った MAIN6
シートを外します。（図 3、写真 1）
2-5 [70] のネジ 2 本を外して、シールドメインからカ
バー PS-USB と共に PS-USBAss'y を外します。
（図4）
2-6 PSUSB シート
2-6-1 PSUSB シートに半田付けされている [B] のフック
（4 箇所）の半田を取り除き、フックを基板の切りか
きと同じ向きになるようにひねると、PSUSB シー
トとシールドPS-USB を分離できます。（写真 2）
※ シールドPS-USB に付いているカバー PS-USB を外す
場合は、両面テープで貼付けられている 2 箇所を剥がし
ます。丁寧に剥がしてください。（図 5）
Precautions（注意事項）
●During assembly, pay attention that connectors, cables or the like are not pinched by circuit boards, frames, etc.
●組み立てるときは、基板やフレームなどでコード類をはさまないように注意してください。

7
AUDIOGRAM6
[80]: BIND HEAD B-TIGHT SCREW（Bタイト＋ BIND）
3.0X8 MFZN2W3 (WE774300)
[90]: PW HEAD TAPPING SCREW-B（Bタイト＋ PWH）
3.0X8 MFZN2W3 (WF00260R)
Fig. 3（図 3）
[70]: BIND HEAD B-TIGHT SCREW（Bタイト＋ BIND）
3.0X8 MFZN2W3 (WE774300)
Fig. 4（図 4）
< Bottom view
（底
から見た図
）
>
[90]
[80]
SHIELD MAIN
（シールドメイン）
MAIN6
PS-USB ASSEMBLY
（PS-USBAssy）
COVER PS-USB
（カバーPS-USB）
TOP COVER ASSEMBLY
（トップカバーAssy）
< Bottom view（底から見た図）>
< Bottom view（底から見た図）>
[70]
SHIELD MAIN
（シールドメイン）
MAIN6
PS-USB ASSEMBLY
（PS-USBAssy）
COVER PS-USB
（カバーPS-USB）
Photo 1（写真 1）
SHIELD PS-USB
（シールドPS-USB）
COVER PS-USB
（カバーPS-USB）
Adhesive tape
（両面テープ）
Fig. 5（図 5）Photo 2（写真 2）
MAIN6
Hooks (Soldering)
（フック（半田付け））
[B]
[B]
Hooks (Soldering)
（フック（半田付け））
PSUSB
SHIELD PS-USB
（シールド PS-USB）
Hook（フック）
[A]
[A]
[A]

AUDIOGRAM6
8
2-7 MAIN6 Circuit Board
2-7-1 Remove the seven (7) hexagonal nuts marked [C] and
four (4) screws marked [40]. The shield main can then
be separated from the MAIN6 circuit board.
(Fig. 6)
2-7-2 Pull out the seven (7) volume knobs marked [120] and
four (4) push buttons marked [140] from the MAIN6
circuit board. (Fig. 6)
*The volume knobs and push buttons are not compo-
nents of the MAIN6 circuit board.
When replacing the MAIN6 circuit board, remove the
volume knobs and push buttons and install them on
the new MAIN6 circuit board.
[40]: BIND HEAD B-TIGHT SCREW（Bタイト＋ BIND）3.0X8 MFZN2W3 (WE774300)
Fig.6( 図 6)
[40] x4
SHIELD MAIN
（シールドメイン）
MAIN6
[C] x7
[120] x7
[140]
[140]
x2
[140]
< Top view（上から見た図）>
2-7 MAIN6 シート
2-7-1 [C] の六角ナット 7 個と [40] ネジ 4 本を外して、
MAIN6 シートとシールドメインを分離します。
（図6）
2-7-2 MAIN6 シートの上面から、[120] のノブ VR（小）
7 個と [140] のボタンHPF
4 個を外します。（図 6）
※ ノブ VR（小）とボタンHPF は MAIN6 シートの構成部品
ではありません。MAIN6 シートを交換する際は、ノブ
VR（小）と ボタンHPF を取り外して新しい MAIN6 シー
トに取り付けてください。

9
AUDIOGRAM6
LSI PIN DESCRIPTION（LSI 端子機能表）
PIN
NO. I/O FUNCTIONNAME PIN
NO. I/ONAME
PCM2904DBR (X9570A00) STEREO AUDIO CODEC WITH USB INTERFACE
DAC analog output for R-channnel
DAC analog output for L-channnel
Internal analog power supply for PLL
Analog ground for PLL
Internal analog power supply for PLL
Crystal oscillator output
Crystal oscillator input
Analog ground for oscillator
Internal analog power supply for oscillator
Test pin, must be connected to GND
Test pin, must be left open
Digital ground
Internal digital power supply
Suspend flag, active low (Low: suspend,
Hihg: operational)
FUNCTION
O
O
-
-
-
O
I
-
-
I
O
-
-
O
VOUTR
VOUTL
VCCP1I
AGNDP
VCCP2I
XTO
XTI
AGNDX
VCCXI
TEST0
TEST1
DGND
VDDI
SSPND
15
16
17
18
19
20
21
22
23
24
25
26
27
28
USB differential input/output plus
USB differential input/output minus
Connect to USB power (VBUS)
Digital ground for USB transceiver
HID key state input (mute), active high
HID key state input (volume up), active high
HID key state input (volume down), active high
Must be set to high
Internal analog power supply for codec
Analog ground for codec
ADC analog input for L-channnel
ADC analog input for R-channnel
Common for ADC/DAC (VCCCI/2)
I/O
I/O
-
-
I
I
I
I
I
-
-
I
I
-
D+
D-
VBUS
DGNDU
HID0
HID1
HID2
SEL0
SEL1
VCCCI
AGNDC
VINL
VINR
VCOM
1
2
3
4
5
6
7
8
9
10
11
12
13
14
PSUSB: IC102

AUDIOGRAM6
10
IC BLOCK DIAGRAM（IC ブロック図）
BA10339F-E2 (X6266A0R)
MAIN6: IC802
Ground Sense Comparator
1
2
3
4
5
6
7
OUT2
OUT1
Vcc
-IN1
+IN1
-IN2
+IN2
14
13
12
11
10
9
8
OUT3
OUT4
VEE
+IN4
-IN4
+IN3
-IN3
+-
+-
+-
+-
1
1.5A
Maximum
ON duty 9.1
OSC BLOCK
4
3
2
8
5
6
7
V+
Es
GND
PWM
Logic
R
SQ
Vref
1.25V
±2%
CD
CT
Cs
SI
IN+
Vth=300mV
Ipk Sense
PWM COMP
ERR. AMP
160Ω
1
2
3
4
8
7
6
5
Cs
CT
GND
CD
SI
V+
IN+
Es
NJM2374AM-TE1 (X9482A00)
PSUSB: IC401, IC501, IC601
PWM DC/DC Converter
NJM072BM-E-TE1 (X4543A01)
MAIN6: IC101
Dual Operational Amplifier
1
2
3
4
8
7
6
5
A Output +V
A +Input
V
-
V+
B Output
B
- Input
B +Input
A
- Input
+-
+-
NJM2068MD-TE2 (X3505A00)
MAIN6: IC301, IC501
PSUSB: IC201, IC202
Dual Operational Amplifier
1
2
3
4-V
8
7
6
5
Output A +V
Non-Inverting
Input A
-DC Voltage Supply
+DC Voltage
Supply
Output B
Inverting
Input B
Non-Inverting
Input B
Inverting
Input A
+-
+-
NJM4580L (XF195A00)
MAIN6: IC703
Dual Operational Amplifier
1
A
2345678
OUT
A
-IN
A
+IN
A
+IN
B
-IN
B
OUT
B
-V +V
-
+
B
-
+
BA4560RF-E2 (X6897A00)
MAIN6: IC102–104, IC201, IC302, IC502,
IC701, IC702, IC801
Dual Operational Amplifier
1
2
3
4-V
8
7
6
5
Output 1 +V
+Input 1
VEE
VCC
Output 2
-Input 2
+Input 2
-Input 1
+-
+-
1
2
3
4
8
7
6
5
GND
EN1
EN2
/OC1
OUT1
OUT2
/OC2
IN
BD2056AFJ-E2 (X9691A00)
PSUSB: IC301
USB High Side Switch
Gate
Logic1
TSD1
TSD2
Charge
pump1
OCD1
OCD2
SW1
SW2
UVLO
8
3
2
4
1
7
6
5
/OC1
EN1
EN2
GND
IN
/OC2
OUT1
OUT2
Charge
pump2
Gate
Logic2

11
AUDIOGRAM6
USB
to MAIN6-CN901
PSUSB Circuit Board
Component side（部品側）
Pattern side（パターン側）
PSUSB: 2NA-WW90300-1 1
CIRCUIT BOARDS（シート基板図）
MAIN6 Circuit Board (X9389D0) ......................................................... 12/13
PSUSB Circuit Board (X9388C0) ............................................................. 11
Note: See parts list for details of circuit board component parts.
注 : シートの部品詳細はパーツリストをご参照ください。

AUDIOGRAM6
12
MAIN6 Circuit Board
to PSUSB-CN702
CH 1
MIC
/INST
MIC
/INST
GAIN
1
COMP 1
LEVEL 1 LEVEL 2 LEVEL 3/4 LEVEL 5/6 MASTER
DAW
SIGNAL
PEAK
PHANTOM
POWER
PHANTOM
PHANTOM
LR
LR
PEAK
1
PEAK
2PEAK
3/4
PEAK
5/6
COMP 2
MONO
/STEREO
GAIN
2
GAIN
3/4
GAIN
5/6
L
CH 2
CH 3
L
CH 4
R
CH 5
L
STEREO
OUT R
STEREO
OUT L
STEREO
OUT R
STEREO
OUT L PHONES
PHONES
CH 6
R
R
Component side（部品側）
MAIN6: 2NA-WM90330-1 2

13
AUDIOGRAM6
MAIN6: 2NA-WM90330-1 2
MAIN6 Circuit Board
X9389C0
R902
Pattern side（パターン側）

AUDIOGRAM6
14
1. Measurement condition
1-1 Environment
Temperature (5˚C – 40˚C)
Humidity (30% – 90%)
1-2 Power supply
Power is supplied from a personal computer. (Powered through USB bus)
2. Electric characteristics
2-0 0 dBu = 0.775 Vrms
2-1 Preparation
Load resistor of each output terminal is as follows:
PHONES (L, R) : 40 Ω(3 W or more)
Others : 10k Ω
2-2 Unless otherwise specified, the operation elements shall be set as follows,
• CH INPUT (CH1, CH2)
GAIN control : Maximum
COMP control : Minimum
CH level control : Maximum
MIC/INST switch : OFF (MIC)
MONO/STEREO switch : OFF (MONO)
• ST CH INPUT (CH3/4, CH5/6)
GAIN control : Maximum
CH level control : Maximum
• MASTER
DAW level control : Minimum
MASTER level control : Maximum
• Others
PHANTOM switch : OFF
2-3 Use 1 kHz sine wave for input signal unless otherwise specified.
2-4 Signal source impedance should be 150 ohms.
2-5 Power indicator
Check that the POWER LED lights when the personal computer is connected.
INSPECTIONS
GAIN control
COMP control
CH level control
DAW level control
MASTER level control
MONO/STEREO
switch
MIC/INST switch
CH1 CH2 CH3/4 CH5/6
PHANTOM switch

15
AUDIOGRAM6
2-6 Gain
Check that the output level of each output terminal is within the range shown in the [Table 2-6.1] and [Table 2-6.2].
* Check that the difference in the level between channels is 2.0 dB or less.
Table 2-6.1 CH INPUT (CH1, CH2) [dBu]
INPUT Input
level
GAIN
control STEREO OUT L STEREO OUT R
qXLR 1-82.0 Maximum -2.0 ± 2.0 –
w2-38.0 Minimum -2.0 ± 2.0 -2.0 ± 2.0
q’PHONE 1(L) -82.0 Maximum -2.0 ± 2.0 *1 –
w’2(R) – -2.0 ± 2.0 *1
ePHONE
(UNBAL)
1-66.0 Maximum -2.0 ± 2.0 *2 –
r2-22.0 Minimum -2.0 ± 2.0 *2 –
*1 Set the MONO/STEREO switch to ON (STEREO).
*2 Set the MIC/INST switch to ON (INST).
Table 2-6.2 ST CH INPUT (CH3/4, CH5/6) [dBu]
INPUT Input
level
GAIN
control STEREO OUT L STEREO OUT R PHONES L PHONES R
t
PHONE
3L/MONO
5L/MONO -56.0 Maximum -2.0 ± 2.0 – -14.8 ± 2.0 –
y3L/MONO
5L/MONO -12.0 Minimum -2.0 ± 2.0 -2.0 ± 2.0 -14.8 ± 2.0 -14.8 ± 2.0
u4R,6R -56.0 Maximum – -2.0 ± 2.0 – -14.8 ± 2.0
2-7 Frequency characteristics
In the signal path of qto uin the [Table 2-6.1] and [Table 2-6.2], check that the output level of each output terminal is within the
range of +1.0/-3.0 dB compared with that of 1 kHz when the signal frequency is set to 20 Hz and 20 kHz.(GAIN control: Minimum)
* Check that the frequency characteristics is within the range of +1.0/-4.5 dB when the signal frequency is set to 20 Hz and 20
kHz and the GAIN control is at maximum.
* In the signal path of y, check only the STEREO OUT L, R.
2-8 Crosstalk
Input signal from the CH1 (L) and check that the leakage level to the STEREO OUT R is -56.0 dBu or less when the output level
of the STEREO OUT L is +14.0 dBu.
Input signal from the CH2 (R) and check that the leakage level to the STEREO OUT L is -56.0 dBu or less when the output level
of the STEREO OUT R is +14.0 dBu.
* Set the MONO/STEREO switch to ON (STEREO).
* Set the CH level controls of the channels which are not measured to minimum.
2-9 CHANNEL PEAK indicator
Check that the CHANNEL PEAK LED lights up when a signal within the range shown in the [Table 2-9.1] is fed to the input.
Table 2-9.1 [dBu]
INPUT Input level
1
2-43.0 ± 2.0
3 L/MONO
5 L/MONO -17.0 ± 2.0
2-10 MASTER PEAK/SIGNAL indicator
Check that the MASTER PEAK/SIGNAL LED lights up when a signal within the range shown in the [Table 2-10.1] is fed to the
input.
Table 2-10.1 [dBu]
INPUT Input level
PEAK SIGNAL
1 -60.0 ± 2.0 -80.0 ± 2.0

AUDIOGRAM6
16
2-11 Distortion
In the signal path of w, rand yin the [Table 2-6.1] and [Table 2-6.2], check that the distortion (T.H.D.) is 0.1% or less when
the output level of the STEREO OUT L, R is +8.0 dBu.
* Change the input signal frequency to “20 Hz”, “1 kHz” and “20 kHz” and measure distortion (T.H.D.).
* Set the CH level controls of the channels which are not measured to minimum.
* In the signal path of y, check only the STEREO OUT L, R.
2-12 Maximum output
Input signal to the CH1 and check that the distortion (T.H.D.) is 1.0 % or less when the output signal at the STEREO OUT L, R is
+14.0 dBu.
Check that the distortion (T.H.D.) is 1.0% or less when the output level at the PHONES L, R is 0.0 dBu.
* Set the CH level controls of the channels except CH1 to minimum.
* Do not connect a load resistor to the PHONES L, R when measuring the STEREO OUT L, R.
2-13 Equivalent input noise
Check that the noise level of the STEREO OUT L, R is -48.0 dBu or less when the pin 2 and pin 3 of the XLR terminal are
connected with the resistance of 150 Ω.
If the noise level is -48.0 dBu or more, check that the input equivalent noise level is -128.0 dBu or less.
* [Equivalent input noise level] = [Noise level] - [Channel gain]
* Set the CH level controls of the channels which are not measured to minimum.
* Use the 12.7 kHz, -6 dB/octave Low Pass Filter when measuring the noise level.
* Set the parameter of the analyzer to the “Mean value” when measuring noise level.
2-14 Residual Noise
Set the CH level controls of every input to minimum.
Check that the noise level of the STEREO OUT L, R is equal to or less than the one shown in the [Table 2-14.1] when the MAS-
TER level control is set to maximum or minimum.
* Use the 12.7 kHz, -6 dB/octave Low Pass Filter when measuring the noise level.
* Set the parameter of the analyzer to the “Mean value” when measuring noise level.
Table 2-14.1[dBu]
MASTER level
control
STEREO OUT
L, R
Maximum -77.0
Minimum -95.0
2-15 Compressor
2-15-1 Gain
Check that the output level of the STEREO OUT L, R is within the range shown in the [Table 2-15.1] when the COMP controls
of the CH1 and CH2 are set to maximum.

Table 2-15.1 [dBu]
INPUT Input
level
COMP
control
STEREO OUT
L, R
XLR 1
2-64.0 Maximum 9.0 ± 2.0
* Set the CH level control to NOMINAL. (Direction of clock hand at 1 o’clock)
2-15-2 Ratio
Check that the output level obtained at the STEREO OUT L, R is within the range shown in the [Table 2-15.2] compared with the
output level of the [Table 2-15.1] if the input level is raised by 10.0 dB in the state of the [Table 2-15.1].
Table 2-15.2
INPUT Input level
[dBu]
COMP
control
STEREO OUT
L, R [dB]
XLR 1
2-54.0 Maximum +3.3 ± 1.0

17
AUDIOGRAM6
2-15-3 Frequency characteristics
In the state of the [Table 2-15.2], check that the output level at the STEREO OUT L, R is within the range of ±3.0 dB compared
with the output at 1 kHz when the signal frequency is set to 20 Hz and 20 kHz.
2-15-4 Distortion
In the state of the [Table 2-15.2], check that the distortion (T.H.D.) when the signal frequency is set to 20 Hz, 1 kHz, and 20 kHz
is equal to or less than the values in the [Table 2-15.4].
Table 2-15.4 [%]
Input Frequency Distortion (T.H.D.)
20 Hz 5.0
1 kHz 1.0
20 kHz 1.0
2-15-5 Attack/Release time
In the state of the [Table 2-15.2] (except input level shown below), check that the attack time and release time of the output at the
STEREO OUT L, R are within the range shown in the [Table 2-15.5].

ATTACK TIME
Restoration Time Restoration Time
90% 100%
100%
RELEASE TIME
90%
* Attack time refers to restoration period when input is changed from -66.0 dBu to -56.0 dBu. (at 90%)
* Release time refers to restoration period when input is changed from -56.0 dBu to -66.0 dBu. (at 90%)

Table 2-15.5 [ms]
STEREO OUT
L, R
Attack time 15 – 35
Release time 130 – 420

AUDIOGRAM6
18
2-16 USB
2-16-1 Recording
In the state of the [Table 2-16.1], record onto a personal computer via USB.
* For recording procedure, refer to “Recording using the Cubase AI 4” on page 24 or “Recording using the TWE” on page 34.
Table 2-16.1[dBu]
INPUT Input level
XLR 1 -82.0
2-16-2 Gain
Check that output level at the STEREO OUT L, R is within a range of +14.0 ± 3.0 dBu when the recorded file is played back via
USB.
* Set the DAW level control to maximum.
* Set the Windows volume control to maximum.
3. Phantom power
Connect the resistance of 4.7 kΩ(1W or more, margin of error should be 1% or less) between the pin 1 and pin 2 of the “CH1
XLR terminal” and short circuit between the pin 2 and pin 3.
Check that the voltage obtained between the pin 1 and pin 2 is between +25.8 V and +29.8 V when the PHANTOM switch is
turned on (LED should light).
* Phantom power is supplied at the CH1 only.
4. Initial setting
All volumes : minimum
All Switches : OFF

19
AUDIOGRAM6
1. 測定条件
1-1 環境
 温度（5℃〜 40℃）
 湿度（30％〜 90％）
1-2 電源
 電源はパーソナルコンピュータより供給されます。（USBバスパワード）
2. 電気的特性
2-0 0dBu=0.775Vrms
2-1 準備
 各出力端子の負荷抵抗は下記の通りです。
 PHONES(L,R) : 40Ω（3W 以上）
 Others : 10kΩ
2-2 特に指定の無い場合、ツマミ類は以下のように設定してください。
 ･CHINPUT(CH1,CH2)
  GAINcontrol :最大
  COMPcontrol :最小
  CHlevelcontrol :最大
  MIC/INSTswitch :OFF(MIC)
  MONO/STEREOswitch :OFF(MONO)
 ･STCHINPUT(CH3/4,CH5/6)
  GAINcontrol :最大
  CHlevelcontrol :最大
 ･MASTER
  DAWlevelcontrol :最小
  MASTERlevelcontrol :最大
 ･Others
  PHANTOMswitch :OFF
2-3 特に指定の無い場合、入力信号は 1kHz の正弦波とします。
2-4 信号源インピーダンスは「150 Ω」とします。
2-5 パワーインジケータ
パーソナルコンピュータ接続時に「POWERLED」が点灯することを確認します。
検査
GAIN control
COMP control
CH level control
DAW level control
MASTER level control
MONO/STEREO
switch
MIC/INST switch
CH1 CH2 CH3/4 CH5/6
PHANTOM switch

AUDIOGRAM6
20
2-6 ゲイン
 各出力端子に得られる出力レベルは［表 2-6.1］、［表 2-6.2］の範囲内であることを確認します。
 * チャンネル間レベル差は「2.0dB」以下であることを確認します。

表 2-6.1CHINPUT(CH1,CH2)[dBu]
INPUT Input
level
GAIN
control STEREO OUT L STEREO OUT R
qXLR 1-82.0 最大 -2.0 ± 2.0 –
w2-38.0 最小 -2.0 ± 2.0 -2.0 ± 2.0
q’PHONE 1(L) -82.0 最大 -2.0 ± 2.0 *1 –
w’2(R) – -2.0 ± 2.0 *1
ePHONE
(UNBAL)
1-66.0 最大 -2.0 ± 2.0 *2 –
r2-22.0 最小 -2.0 ± 2.0 *2 –
*1「MONO/STEREO スイッチ」をオン（STEREO）にしてください。
*2「MIC/INSTスイッチ」をオン（INST）にしてください。

表 2-6.2STCHINPUT(CH3/4,CH5/6)[dBu]
INPUT Input
level
GAIN
control STEREO OUT L STEREO OUT R PHONES L PHONES R
t
PHONE
3L/MONO
5L/MONO -56.0 最大 -2.0 ± 2.0 – -14.8 ± 2.0 –
y3L/MONO
5L/MONO -12.0 最小 -2.0 ± 2.0 -2.0 ± 2.0 -14.8 ± 2.0 -14.8 ± 2.0
u4R,6R -56.0 最大 – -2.0 ± 2.0 – -14.8 ± 2.0
2-7 周波数特性
 ［表 2-6.1］、［表 2-6.2］の①〜⑦の系統において信号周波数を「20Hz」、「20kHz」とした時、各出力端子に得られる
出力レベルは、「1kHz」を基準として「+1.0/-3.0dB」の範囲内であることを確認します。（GAIN コントロール：最小）
*「GAINコントロール」が「最大」の時、「20Hz」と「20kHz」は「+1.0/-4.5dB」の範囲内であることを確認します。
 *⑥の系統は、「STEREOOUTL,R」のみを測定します。
2-8 クロストーク
 「CH1(L)」から信号を入力し「STEREOOUTL」の出力レベルを「+14.0dBu」とした時、「STEREOOUTR」への
漏れレベルは「-56.0dBu」以下であることを確認します。
 「CH2(R)」から信号を入力し「STEREOOUTR」の出力レベルを「+14.0dBu」とした時、「STEREOOUTL」への
漏れレベルは「-56.0dBu」以下であることを確認します。
*「MONO/STEREOスイッチ」をオン（STEREO）にしてください。
 *測定チャンネル以外の「CH レベルコントロール」は「最小」に設定してください。
2-9 チャンネル PEAK インジケータ
 「チャンネル PEAKLED」が点灯する入力レベルは、［表 2-9.1］の範囲内であることを確認します。

表 2-9.1[dBu]
INPUT Input level
1
2-43.0 ± 2.0
3 L/MONO
5 L/MONO -17.0 ± 2.0
2-10 マスター PEAK/SIGNAL インジケータ
 「MASTERPEAK/SIGNALLED」が点灯する入力レベルは、［表 2-10.1］の範囲内であることを確認します。

表 2-10.1[dBu]
INPUT Input level
PEAK SIGNAL
1 -60.0 ± 2.0 -80.0 ± 2.0