Yamaha IM8-32 User manual

SERVICE MANUAL
HAMAMATSU, JAPAN
Copyright (c) Yamaha Corporation. All rights reserved. PDF
&
’08.07
SPECIFICATIONS（総合仕様）.................................................5
PANEL LAYOUT（パネルレイアウト）......................................9
DIMENSIONAL DIAGRAM（寸法図）......................................16
CIRCUIT BOARD LAYOUT（ユニットレイアウト）...............18
DISASSEMBLY PROCEDURE（分解手順）............................20
LSI PIN DESCRIPTION（LSI 端子機能表）.............................45
IC BLOCK DIAGRAM（IC ブロック図）..................................46
CIRCUIT BOARDS（シート基板図）.......................................47
INSPECTIONS（検査）...................................................103/114
PARTS LIST
BLOCK DIAGRAM（ブロックダイアグラム）
OVERALLCONNECTORCIRCUITDIAGRAM
（総コネクタ接続回路図）
CIRCUIT DIAGRAM（回路図）
CONTENTS（目次）
MIXING CONSOLE
IM8-24: 200807 オープンプライス
IM8-32: 200807 オープンプライス
IM8-40: 200807 オープンプライス
PW8: 200807
オープンプライス
PSL1010: 200807 オープンプライス
IM8-40
PA 011911
OPTION（オプション）
• POWER SUPPLY
PW8
• POWER SUPPLY LINK CABLE
PSL1010
Pleaserefertothepage3andpage4forproductsphotos.
本体写真は、本文 P3 と P4 を参照ください。

IM8-40/IM8-32/IM8-24
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。
Take care not to trap your fingers.
（作業中は指を挟まない様に注意してください。）

3
IM8-40/IM8-32/IM8-24
IM8-40
IM8-32
IM8-24

IM8-40/IM8-32/IM8-24
4
PW8
PW8
PW8
PSL1010

5
IM8-40/IM8-32/IM8-24
SPECIFICATIONS（総合仕様）
Electrical Specifications
All faders are nominal when measured. (The nominal position is 10 dB lower than the maximum position.)
Output impedance of signal generator: 150 ohms
* IM8-40: 1-40, IM8-32: 1-32, IM8-24: 1-24
MIN TYP MAX UNIT
Frequency Response STEREO OUT
GROUP OUT
AUX SEND
MONITOR OUT
REC OUT
GAIN: min (MONO CH INPUT*, ST CH INPUT 1-4)
20 Hz-20 kHz
Nominal output level @ 1 kHz
Input: MONO CHs*, ST CHs 1-4, AUX RETURN,
2TR IN
-3.0 0.0 1.0 dB
Total Harmonic Distortion (THD + N) STEREO OUT +14 dBu @ 20 Hz-20 kHz, GAIN: min 0.1 %
Hum & Noise
Hum & Noise are measured with a
6 dB/octave filter @ 12.7 kHz;
equivalent to a 20 kHz filter with
infinite dB/octave attenuation.
MONO CH INPUT* EIN (Equivalent Input Noise) Rs = 150 Ω, GAIN: max -128 dBu
STEREO OUT
GROUP OUT
STEREO OUT, GROUP OUT faders at nominal level
and all CH assign switches off. -80 dBu
AUX SEND AUX SEND faders at nominal level and all CH AUX
controls at minimum. -75 dBu
STEREO OUT
GROUP OUT
STEREO OUT, GROUP OUT faders and one CH fader
at nominal level. -64 dBu
STEREO OUT Residual output noise -98 dBu
Crosstalk (1 kHz) Adjacent Input MONO CH INPUT*, GAIN: min -70 dB
Input to Output STEREO OUT L/R, MOMO CH INPUT*,
PAN: panned hard left or right -70 dB
Maximum Voltage Gain (1 kHz)
All faders and controls are maximum
when measured.
PAN/BAL: panned hard left or
hard right.
Rs = 150 Ω
INPUT GAIN: max
From MONO CH
INPUT*
INSERT OUT (MONO CH) 60 dB
DIRECT OUT (MONO CH) 60 dB
INSERT OUT (STEREO, GROUP, MONO) 70 dB
STEREO OUT 84 dB
GROUP OUT
MATRIX OUT 90 dB
REC OUT 62.2 dB
MONO OUT 84 dB
MONITOR OUT 70 dB
PHONES OUT 79 dB
AUX SEND, PRE 80 dB
AUX SEND, POST 90 dB
INSERT OUT (AUX), PRE 66 dB
INSERT OUT (AUX), POST 76 dB
Rs = 150 Ω
INPUT GAIN: max
From ST CH
INPUT 1-4
STEREO OUT 58 dB
GROUP OUT
AUX SEND, PRE 51 dB
AUX SEND, POST 61 dB
From AUX
RETURN
STEREO OUT 16 dB
GROUP OUT
AUX SEND 13 dB
From 2TR IN STEREO OUT 27.8 dB
From TALKBACK
MIC IN
STEREO OUT
70 dBGROUP OUT
AUX OUT

IM8-40/IM8-32/IM8-24
6
General Specifications
All faders are nominal when measured. (The nominal position is 10 dB lower than the maximum position.)
Output impedance of signal generator: 150 ohms
* IM8-40: 1-40, IM8-32: 1-32, IM8-24: 1-24
Analog Input Specifications
Where 0 dBu = 0.775 Vrms and 0 dBV = 1 Vrms
* Sensitivity is the lowest level that will produce an output of +4dB (1.23 V), or the nominal output level when the unit is set to the maximum level. (All faders and
level controls are at their maximum positions.)
Input HPF MONO CH INPUT* 80 Hz, 12 dB/oct
Input Equalization
(+15, -15 dB maximum)
Turn over/roll-off frequency of
shelving: 3 dB below maximum
variable level.
MONO CH INPUT* HIGH: 10 kHz (shelving)
Hi-MID: 400 Hz-8 kHz (peaking)
LO-MID: 80 Hz-1.6 kHz (peaking)
LOW: 100 Hz (shelving)
ST CH INPUT HIGH: 10 kHz (shelving)
Hi-MID: 3 kHz (peaking)
LO-MID: 800 Hz (peaking)
LOW: 100 Hz (shelving)
LAMP
IM8-40: 3 pcs, IM8-32/24: 2 pcs
XLR-4-31 type, The LAMP voltage is 12 V DC between 3 and 4 pins of
XLR-4-31 connectors. Each lamp can use 5 W max.
Signal Indicator MONO CH INPUT*
ST CH INPUT 1-4
INSERT OUT
3 points LED meter (PEAK, 0, -20 dB)
PEAK lights if the signal reaches 3 dB below the clipping level.
GROUP OUT, AUX SEND, MONO OUT
LED Level Meter Post STEREO OUT fader
Pre MONITOR control
4 x 12 points LED meters
(PEAK, +10, +6, +3, 0, -3, -6, -10, -15, -20, -25, -30 dB)
USB Audio USB IN/OUT Sampling Frequency = 44.1/48 kHz (depending on the PC application)
Compressor MONO CH INPUT* Control x 1 (gain/threshold/ratio)
Dimensions Height: 219 mm, Depth: 739 mm,
Width: 1716 mm (IM8-40), 1471.5 mm (IM8-32), 1227 mm (IM8-24)
Net Weight 51.5 kg (IM8-40), 44.4 kg (IM8-32), 37.8 kg (IM8-24)
Input Connectors PAD GAIN
Input
Impedance
Appropriate
Impedance
Sensitivity* Nominal Level Max. before
clipping Connector Specifications
INPUT A
(MONO CHs)
IM8-40: 1-40
IM8-32: 1-32
IM8-40: 1-24
0-60 dB
3 kΩ50-600 Ω
Mics
-80 dBu (0.078 mV) -60 dBu (0.775 mV) -40 dBu (7.75 mV) XLR-3-31type
(balanced [1=GND, 2=HOT,
3=COLD])
-16 dB
-36 dBu (12.3 mV) -16 dBu (123 mV)
+4 dBu (1.23 V)
26 dB -34 dB
-54 dBu (1.55 mV) -34 dBu (15.5 mV) -14 dBu (155 mV)
+10 dB -10 dBu (245 mV) +10 dBu (2.45 V) +30 dBu (24.5 V)
INPUT B
(MONO CHs)
IM8-40: 1-40
IM8-32: 1-32
IM8-40: 1-24
0-60 dB
10 kΩ600 Ω
Mics/Lines
-80 dBu (0.078 mV) -60 dBu (0.775 mV) -40 dBu (7.75m V) TRS phone jack
(balanced [Tip = HOT,
Ring = COLD,
Sleeve = GND])
-16 dB
-36 dBu (12.3 mV) -16 dBu (123 mV) +4 dBu (1.23 V)
26 dB -34 dB
-54 dBu (1.55 mV) -34 dBu (15.5 mV) -14 dBu (155 mV)
+10 dB -10 dBu (245 mV) +10 dBu (2.45 V) +30 dBu (24.5 V)
INPUT A/B
(ST CHs) –-34 dB 10 kΩ
-54 dBu (1.55 mV) -34 dBu (15.5 mV) -14 dBu (155 mV) Phone jack (unbalanced)
RCA pin jack
+10 dB
-10 dBu (245 mV) +10 dBu (2.45 V) +30 dBu (24.5 V)
INSERT IN
(MONO CHs)
IM8-40: 1-40
IM8-32: 1-32
IM8-40: 1-24
10 kΩ
-20 dBu (77.5 mV) 0 dBu (0.775 V) +20 dBu (7.75 V)
TRS phone jack
(unbalanced [Tip = Out,
Ring = In, Sleeve = GND])
INSERT IN
(AUX, GROUP,
STEREO, MONO)
10 kΩ
-10 dBu (245 mV) 0 dBu (0.775 V) +10 dBu (2.45 V)
TRS phone jack
(unbalanced [Tip = Out,
Ring = In, Sleeve = GND])
AUX RETURN 1-4 10 kΩ
600ΩLines
600ΩLines
600ΩLines
600ΩLines
600ΩLines
-12 dBu (195 mV) +4 dBu (1.23 V) +24 dBu (12.3 V) Phone jack (unbalanced)
2TR IN L/R 10 kΩ
-26 dBV (50.1 mV) -10 dBV (0.316 V)
+10 dBV (3.16 V) RCA pin jack
3.5 DIA stereo phone jack
TALKBACK MIC IN 10 kΩ
-66 dBu (0.389 mV) -50 dBu (2.45 mV) -30 dBu (24.5 mV) XLR-3-31 type (unbalanced)
––
––
––
––
––
600ΩLines

7
IM8-40/IM8-32/IM8-24
Analog Output Specifications
Where 0 dBu = 0.775 Vrms and 0 dBV = 1 Vrms
Digital Input/Output Specifications
Output Connectors Output
Impedance
Appropriate
Impedance
Nominal Level Max. before
clipping Connector Specifications
STEREO OUT L/R 75Ω
600ΩLines +4 dBu (1.23 V) +24 dBu (12.3 V) XLR-3-32 type (balanced [1 = GND, 2 = HOT, 3 = COLD])
GROUP OUT 1-8 150Ω
10 kΩLines +4 dBu (1.23 V) +20 dBu (7.75 V) TRS phone jack (impedance balanced [Tip = HOT,
Ring = COLD, Sleeve = GND])
AUX SEND 1-8 75Ω
600ΩLines +4 dBu (1.23 V) +24 dBu (12.3 V) XLR-3-32 type (balanced [1 = GND, 2 = HOT, 3 = COLD])
MATRIX OUT 1-8 150Ω
10 kΩLines +4 dBu (1.23 V) +20 dBu (7.75 V) TRS phone jack (impedance balanced [Tip = HOT,
Ring = COLD, Sleeve = GND])
MONO OUT 75Ω
600ΩLines +4 dBu (1.23 V) +24 dBu (12.3 V) XLR-3-32 type (balanced [1 = GND, 2 = HOT, 3 = COLD])
INSERT OUT (MONO CHs) 150Ω 10 kΩLines 0 dBu (0.775 V) +20 dBu (7.75 V) Phone jack (unbalanced [Tip: Out, Ring = In, Sleeve = GND])
INSERT OUT (AUX, GROUP,
STEREO, MONO)
150Ω 10 kΩLines 0 dBu (0.775 V) +20 dBu (7.75 V)
Phone jack (unbalanced [Tip: Out, Ring = In, Sleeve = GND])
DIRECT OUT (MONO CHs)
150Ω 10 kΩLines 0 dBu (0.775 V) +20 dBu (7.75 V) TRS phone jack (impedance balanced [Tip = HOT,
Ring = COLD, Sleeve = GND])
REC OUT L/R 600Ω
10 kΩLines -10 dBV (0.3016 V) +10 dBV (3.16 V) RCA pin jack
MONITOR OUT L/R 150Ω
10 kΩLines +4 dBu (1.23 V) +20 dBu (7.75 V) TRS phone jack (impedance balanced [Tip = HOT,
Ring = COLD, Sleeve = GND])
PHONES 100Ω
40ΩPhones 3 mW 75 mW Stereo phone jack
Connector Format Data Length Connector Specifications
USB
USB AUDIO 1.1 16 bit USB B type

IM8-40/IM8-32/IM8-24
8
Jack List
Input/Output Jacks Polarities Configurations
INPUT A (Monaural channels), AUX SEND, STEREO OUT, MONO OUT,
TALKBACK
Pin 1: Ground
Pin 2: Hot (+)
Pin 3: Cold (-)
XLR-3-31/XLR-3-32 Jack
LAMP
Pin 1: NC
Pin 2: NC
Pin 3: Ground
Pin 4: +12 V
XLR-4-31 Jack
INPUT B (Monaural channels), GROUP OUT, MATRIX OUT, MONITOR OUT
Tip: Hot (+)
Ring: Cold (-)
Sleeve: Ground
TRS Phone Jack
CH INSERT, AUX INSERT, GROUP INSERT, STEREO INSERT, MONO INSERT,
DIRECT OUT
Tip: Output
Ring: Input
Sleeve: Ground
PHONES
Tip: L
Ring: R
Sleeve: Ground
INPUT A (Stereo channels), AUX RETURN Tip: Hot
Sleeve: Ground
Phone Jack
312 321
INPUT OUTPUT
1
23
4
Ring
Sleeve Tip
Sleeve Tip

9
IM8-40/IM8-32/IM8-24
PANEL LAYOUT（パネルレイアウト）
Rear Panel（リアパネル）
Channel control section (Monaural channels)
（チャンネルコントロール部（モノラルチャンネル））
Channel control section (Monaural channels)
（チャンネルコントロール部（モノラルチャンネル））
Channel control section (Monaural channels)
（チャンネルコントロール部（モノラルチャンネル））
Top Panel（トップパネル）
Channel control section (Stereo channels)
（チャンネルコントロール部（ステレオチャンネル））
Master control section
（マスターコントロール部）
LAMPConnector
（LAMP 端子）
LAMPConnector
（LAMP 端子）
LAMPConnector
（LAMP 端子）
Master control section
（マスターコントロール部）
※このイラストはIM8-40です。IM8-32/24はチャンネルコントロール部（モノラルチャンネル）と
LAMP端子の数と位置が違います。
※This illustration shows IM8-40. The channel control part (monaural channel) and the number and
location of the LAMP terminals of IM8-32/24 are different from those of IM8-40.




・Rear Panel（リアパネル）

Monaural channels
（モノラルチャンネル）
Stereo channels
（ステレオチャンネル）
qINPUT Jack (monaural)
wINSERT Jack
eDIRECT OUT Jack
rINPUT Jacks (stereo)
●Channel control section（チャンネルコントロール部）
q INPUT端子（モノラル）
wINSERT端子
eDIRECTOUT端子
rINPUT端子（ステレオ）

IM8-40/IM8-32/IM8-24
10






"
#
$
%
(
)
'
&
*
+
,
-
・Top Panel（トップパネル）

Monaural channels
（モノラルチャンネル）
Stereo channels
（ステレオチャンネル）
t+48V Switch/Indicator
y26 dB (PAD) Switch
uGAIN Control
iφ(Phase) Switch
o
80(High Pass Filter) Switch
!0 COMP Control/Indicator
!1 EQ (Equalizer): HIGH, HI-MID, LO-MID, LOW
!2 EQ ON Switch
!3 AUX Controls (1–8)
!4 PRE Switches
!5 PAN Control
!6 BAL Control
!7 ON Switch/Indicator
!8 Input Meter
!9 Bus Assign Switches
@0 MUTE Switches (1–4)
@1 PFL Switch/Indicator
@2 Channel Fader
t+48Vスイッチ /インジケーター
y26dB（PAD）スイッチ
uGAINコントロール
iφ（Phase）スイッチ
o
80（ハイパスフィルター）スイッチ
!0 COMPコントロール /インジケーター
!1 EQ（イコライザー:HIGH,HI-MID,LO-MID,LOW）
!2 EQONスイッチ
!3 AUXコントロール（1〜8）
!4 PREスイッチ
!5 PANコントロール
!6 BALコントロール
!7 ONスイッチ /インジケーター
!8 インプットメーター
!9 バスアサインスイッチ
@0 MUTEスイッチ（1〜4）
@1 PFLスイッチ /インジケーター
@2 チャンネルフェーダー