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STAGEPAS 300
SERVICE MANUAL
Speaker Mixer Speaker
CONTENTS
SPECIFICATIONS 3
PANEL LAYOUT 4
DIMENSIONS 4
CIRCUIT BOARD LAYOUT 5
DISASSEMBLY PROCEDURE 6
IC BLOCK DIAGRAM IC 15
CIRCUIT BOARDS 16
INSPECTIONS 23
TROUBLE SHOOTING 26
PARTS LIST
BLOCK DIAGRAM
CIRCUIT DIAGRAM
PA 011775
20050321-86100
HAMAMATSU, JAPAN 1
Copyright (c) Yamaha Corporation. All rights reserved. PDF-K9611 '05.04
STAGEPAS 300
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: 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 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.
IMPORTANT NOTICE FOR THE UNITED KINGDOM As the colours of the wires in the mains lead of this apparatus may not
Connecting the Plug and Cord correspond with the coloured markings identifying the terminals in your plug
proceed as follows:
WARNING: THIS APPARATUS MUST BE EARTHED The wire which is coloured GREEN-and-YELLOW must be connected to the
IMPORTANT. The wires in this mains lead are coloured in accordance terminal in the plug which is marked by the letter E or by the safety earth
with the following code: symbol or colored GREEN or GREEN-and-YELLOW.
GREEN-AND-YELLOW : EARTH The wire which is coloured BLUE must be connected to the terminal which is
BLUE : NEUTRAL marked with the letter N or coloured BLACK.
BROWN : LIVE The wire which is coloured BROWN must be connected to the terminal which is
marked with the letter L or coloured RED.
This applies only to products distributed by Yamaha-Kemble Music (U.K.) Ltd. (3 wires)
WARNING
Components having special characteristics are marked and must be replaced with parts having specification equal to those
originally installed.
2
STAGEPAS 300
SPECIFICATIONS
General Specifications
Maximum Output Power
150 W+150 W/6 @10 % THD at 1 kHz (SPEAKER L/R)
100 W+100 W/6 @1 % THD at 1 kHz (SPEAKER L/R)
Frequency Response
-3 dB, 0 dB, +1 dB @20 Hz20 kHz, 1 W Output/6 (Without
MUSIC/SPEECH, EQ and SP EQ Circuit) (SPEAKER L/R)
-3 dB, 0 dB, +1 dB @20 Hz20 kHz, +4 dBu 10 k Load
[MUSIC/SPEECH]switch=MUSIC (MONITOR OUT, REC OUT)
Total Harmonic Distortion
1 % @1 kHz, 50 W Output Power (SPEAKER L/R)
0.5 % @20 Hz20 kHz, +14 dBu 10 k (MONITOR OUT, REC OUT)
Hum & Noise (20 Hz20 kHz, Rs=150 , MIC/LINE switch=MIC)
-65 dBu Residual output noise (SPEAKER L/R)
-90 dBu Residual output noise (MONITOR OUT, REC OUT)
-67 dBu @MONITOR OUT control & one CH LEVEL control
at nomunal level (CH14)(MONITOR OUT)
Crosstalk (1 kHz)
-70 dB between input channels
Weight
18 kg (mixer and two speakers)
Power Consumption
70 W
Stereo Input Channel Equalization:
Shelving turnover/rolloff frequency:
3 dB before maximum cut or boost.
±15 dB
HIGH 10 kHz shelving
LOW 100 Hz shelving
Accessories
Power Cable, Speaker Cable, Owner's Manual
Option
Microphone
Speaker
Enclosure
Bass-reflex type
Speaker Unit
LF: 8" (20 cm) Cone
HF: 1" (2.54 cm) Compression Driver
Cross Over Frequency
4 kHz
Frequency Range
55 Hz20 kHz
Maximum Output Level
112 dB (1 m)
3
STAGEPAS 300
PANEL LAYOUT
u o !0
q [POWER] switch
w [AC IN] jack
e [SPEAKER L/R] jacks
r [REC OUT L/R] jacks
t [MONITOR OUT L(MONO)/R] jacks
y Channel input jacks (CH 1 to 4)
u Stereo channel input jacks (CH 5/6, 7/8)
y
!2 i [MIC/LINE] switches
o Equalizer [HIGH]/[LOW]
!0 [REVERB] switches
i !1 [REVERB] control
t !2 [LEVEL] control
r !5 !1 !4 !3 [MASTER LEVEL] control
!3
e !7 !4 [SPEECH/MUSIC] switch
!5 [MONITOR OUT] control
!6 [LEVEL] meter
w q !7 [POWER] indicator
!6
DIMENSIONS
Speaker Mixer 160
1
MSC
3
2
1
455.5
MSC
3
2
290
1
MSC
3
2
1
MSC
3
2
96.3
275 255
137
120
2-M8x25
Unit: mm
4
Front view Right side view Rear view
Speaker HF
HF < >
NETWORK1 NETWORK1 POWER POWER
or or
NETWORK2 NETWORK2 FILTER
CIRCUIT BOARD LAYOUT
INPUT
VR
VR
FILTER
Power amplifier unit
JACK2
JACK1A
or
JACK1B
Speaker LF Power amplifier unit
LF < >
5
STAGEPAS 300
STAGEPAS 300
DISASSEMBLY PROCEDURE
1. Front Grille Assembly
(Time required: About 1 minute)
1-1 Remove the four (4) screws marked [120A]. The
front grille assembly can then be removed. (Fig.1)
2. Speaker LF (Woofer)
(Time required: About 2 minutes)
2-1 Remove the front grille assembly. (See procedure 1)
2-2 Remove the four (4) screws marked [100A]. The
speaker LF (woofer) can then be removed. (Fig.1)
2-3 Remove the wire LF (red/black) attached to the
speaker LF (woofer). (Photo.1)
3. Front Cabinet Unit, Rear Cabinet Unit
(Time required: About 3 minutes)
3-1 Remove the front grille assembly. (See procedure 1)
3-2 Remove the five (5) screws marked [80A] and four
(4) screws marked [80B]. The front cabinet unit and
rear cabinet unit can then be separated. (Fig.1,2)
3-3 Remove the wire LF (red/black) attached to the
speaker LF (woofer). (Photo.1)
3-4 Remove the wire HF (yellow/blue) attached to the
speaker HF (tweeter). (Photo.2)
* Take care not to open the front cabinet unit and
rear cabinet unit too wide or the speaker LF
(woofer) terminal and speaker HF (tweeter)
terminal may be damaged.
Rear cabinet unit
Front cabinet unit ( )
( ) [80B]
[80B]
[120A]
[120A]
[80A]
[80A]
[100A] [100A]
Front grille assembly Speaker LF (Woofer)
( Ass'y) ( LF ( ))
[80A] [80A]
[100A] [100A]
[80B]
[120A] [80B]
[120A]
[80A]
[80B]: Bind Head Tapping Screw-A ( )
[80A]: Bind Head Tapping Screw-A ( ) 5.0X35 NI-BL (AAX61640)
5.0X35 NI-BL (AAX61640)
[100A]: Bind Head Tapping Screw-B ( ) Fig.2 ( )
4.0X18 NI-BL (AAX61660)
[120A]: Bind Head Tapping Screw-B ( )
4.0X10 NI-BL (AAX61680)
Fig.1 ( )
6
STAGEPAS 300
Speaker LF (Woofer) Speaker HF (Tweeter)
( LF( )) ( HF( ))
Wire LF (Red) Wire LF (Black) Wire HF (Blue) Wire HF (Yellow)
( LF( )) ( LF( )) ( HF( )) ( HF( ))
Photo 1 ( ) Photo 2 ( )
4. Speaker HF (Tweeter)
(Time required: About 4 minutes)
4-1 Remove the front grille assembly. (See procedure 1)
4-2 Separate the front cabinet unit and rear cabinet unit.
(See procedure 3)
4-3 Remove the two (2) screws marked [70A]. The
speaker HF (tweeter) can then be removed from
the front cabinet unit. (Fig.3)
5. Network Assembly, NETWORK1 Circuit
Board or NETWORK2 Circuit Board
(Time required: About 7 minutes)
5-1 Remove the front grille assembly. (See procedure 1)
5-2 Separate the front cabinet unit and rear cabinet unit.
(See procedure 3)
5-3 Remove the four (4) screws marked [13]. The
network assembly can then be removed from the
rear cabinet unit. (Fig.4)
5-4 Remove the four (4) screws marked [N40]. The
network holders C and D can then be removed from
the NETWORK1 circuit board or NETWORK2 circuit
board. (Fig.4) Network holder D
( ) NETWORK1
or
[70A] NETWORK2
Speaker HF (Tweeter)
( HF ( )) [N40] X 4
[13] X 4
Network holder C
Front cabinet unit
( )
( )
Network assembly
( )
Rear cabinet unit
( )
[70A]: Bind Head Tapping Screw-B ( )
4.0X20 NI-BL (AAX61630)
Fig.3 ( 3)
[13]: Bind Head Tapping Screw-B ( )
3.0X10 NI-BL (AAX61710)
[N40]: Pan Head Tapping Screw-B ( )
3.0X8 CR3 (AAX61700)
Fig.4 ( )
7
STAGEPAS 300
6. Mixer Assembly, Cover Mold Assembly
(Time required: About 1 minute)
6-1 Rotate the two (2) straight slots on the fastener
heads with a coin driver or minus driver until each
straight slot is in alignment with the OPEN position.
The mixer assembly or cover mold assembly can
then be removed. (Fig.5)
Coin driver or minus driver Fastner head
( ( )
)
Panel side
( )
Mixer assembly
Cover mold assembly ( Ass'y)
Rear case side
( Ass'y)
( )
Fig.5 ( )
7. JACK1A Circuit Board or JACK1B Circuit
Board (Time required: About 2 minutes)
7-1 Remove the mixer assembly or cover mold
assembly. (See procedure 6)
7-2 Remove the three (3) screws marked [16]. The
mount bracket assembly can then be removed
together with the JACK1A circuit board or JACK1B
circuit board. (Fig.6)
7-3 Remove the hexagonal nut marked [140a]. The
JACK1A circuit board or JACK1B circuit board can
then be removed from the mount bracket assembly.
(Fig.6)
[140a]
[16] X 3
Mount bracket assembly
( )
JACK1A
or
JACK1B
[16]: Bind Head Tapping Screw-B ( ) 4.0X10 NI-BL (AAX61680)
[140a]: Hexagonal Nut ( ) M15.0 BL
Fig.6 ( )
8
STAGEPAS 300
8. Mixer Assembly (Panel Assembly, Rear
Case Assembly)
(Time required: About 3 minutes)
8-1 Remove the mixer assembly. (See procedure 6)
8-2 Remove the eight (8) screws marked [340], and
separate the panel assembly and rear case
assembly from the mixer assembly. (Fig.7) (See the
cautions below:)
* When removing the panel assembly, take care
not to damage the three connector assemblies
(connector assembly A, B, C). (Fig.7)
* When assembling the panel assembly, connect the
three connector assemblies (connector assembly
A, B, C) in alphabetical order (AB C). (Fig.7) Panel assembly
VR circuit board - CN24 ( ) [340] X 8
( )
Connector assembly C
( )
Connector assembly A
( )
POWER circuit board - CN2
(POWER )
Connector assembly B
( )
POWER circuit board - CN9
(POWER ) Rear case assembly
( )
[340]: Hexagonal Tapping Screw-B ( ) 3.0X8 NI-BL (AAX62010)
Fig.7 ( )
[Disassembly of Panel Assembly (Mixer Assembly)]
9. INPUT Circuit Board
(Time required: About 6 minutes)
9-1 Remove the eight (8) hexagonal nuts marked [190a]
and ten (10) screws marked [200] from the panel
printing side. (Fig.8)
9-2 Remove the INPUT circuit board from the connectors
CN21 and CN26 of the VR circuit board. (Fig.8)
* The four (4) push buttons marked [170] and four
(4) push spacers marked [180] are not parts of
the INPUT circuit board. When replacing the
INPUT circuit board, be sure to remove these
parts and attach them to the new INPUT circuit
board. (Fig.9) 9
STAGEPAS 300
10. VR Circuit Board
(Time required: About 10 minutes)
10-1 Remove the INPUT circuit board. (See procedure 9)
10-2 Remove the six (6) volume knobs (white) marked
[130] and the volume knob (red) marked [140] from
the panel printing side. (Fig.8)
10-3 Remove the five (5) screws marked [160]. The VR
circuit board can then be removed. (Fig.10)
* The following parts are not parts of the VR
circuit board. When replacing the VR circuit
board, be sure to remove these parts and attach
them to the new VR circuit board. (Fig.11)
· [90]: Push buttons 5 pcs.
· [100B]: Volume knob (S) (white) 1 pc.
· [110A]: Volume knobs (S) (green) 12 pcs.
· [120B]: Volume knob (S) (blue) 1 pc.
[190a] X 8
[140] Volume knob (Red)
( ( )) INPUT
[200] X 10
[CN26] [CN21]
VR
Panel assembly
( )
[130] Volume knob (White) X 6
( ( ))
[190a]: Hexagonal Nut ( ) M11.0
[200]: Bind Head Tapping Screw-B ( ) 3.0X10 NI-BL (AAX61710)
Fig.8 ( )
VR
[170] Push button [160] X 5
( )
[180] Push spacer
( )
INPUT
Fig.9 ( )
Panel assembly
( )
[160]: Bind Head Screw ( )
3.0X8 CR3 (AAX61910)
Fig.10 ( )
10
STAGEPAS 300
[100B] Volume knob (S) (White) [120B] Volume knob (S) (Blue)
( (S)( )) ( (S)( ))
[110A] Volume knob (S) (Green) X 12
( (S)( ))
[90] Push button X 5
( )
VR
Fig.11 ( )
11. FILTER Circuit Board
(Time required: About 4 minutes)
11-1 Remove the FILTER circuit board from the connectors
CN27 and CN31 of the VR circuit board. (Fig.12)
12. JACK2 Circuit Board
(Time required: About 4 minutes)
12-1 Remove the two (2) hexagonal nuts marked [220a]
from the panel printing side. The JACK2 circuit
board can then be removed. (Fig.13)
13. Power Switch, AC Inlet
(Time required: About 5 minutes)
13-1 Remove the two (2) connector assemblies
(connector assembly (1P) and connector assembly
(2P)) and earth wire soldered to the power switch
and AC inlet. (Fig.14)
13-2 Remove the power switch by pressing its claws.
(Fig.15)
13-3 Remove the AC inlet by pressing its claws. (Fig.16)
[CN32]
FILTER Panel assembly [220a] X 2
( )
[CN28]
to VR circuit board - CN31
INPUT ( )
to VR circuit board - CN27
( )
[CN31] JACK2
[CN27]
Panel assembly VR
( )
[220a]: Hexagonal Nut ( ) M15.0 BL
Fig.12 ( ) Fig.13 ( )
11
STAGEPAS 300
Panel ( )
Earth wire (green) (brown)
( ( )) ( )
Connector assembly (2P)
(blue) ( 2P)
( )
Power switch Connector assembly (1P) (brown)
( ) ( 1P ( ))
AC inlet
Soldering ( ) (AC )
Fig.14 ( )
Panel ( ) Panel ( )
Claw ( )
AC inlet
(AC )
Claw ( )
Power switch ( )
Claw
Claw ( ) ( )
Fig.15 ( ) Fig.16 ( )
[Disassembly of Rear Case Assembly (Mixer Assembly)]
14. Power Amplifier Unit, POWER Circuit
Board (Time required: About 6 minutes)
14-1 Remove the screw marked [270A]. The power
amplifier unit A can then be removed. (Fig.17)
14-2 Remove the screw marked [270B]. The power
amplifier unit B can then be removed. (Fig.17)
14-3 Remove the two (2) screws marked [320]. The
insulator C can then be removed. (Fig.18)
14-4 Remove the two (2) rivets marked [310]. The
insulator B can then be removed. (Fig.18)
14-5 Remove the seven (7) screws marked [260]. The
POWER circuit board can then be removed. (Fig.17)
* The cushion A is not a part of the POWER circuit
board. When replacing the POWER circuit board,
be sure to attach the cushion A to the new
POWER circuit board. (Fig.19)
12
STAGEPAS 300
[260] X 7
[270A]
POWER [270B]
Power amplifier unit B
( )
Power amplifier unit A
( )
[CN5]
[CN6]
[CN4] [CN7]
Rear case assembly
( )
[260]: Bind Head Tapping Screw-B ( ) 3.0X8 CR3 (AAX61980)
[270]: Bind Head Tapping Screw-B ( ) 3.0X10 NI-BL (AAX61710)
Fig.17 ( )
[310]
[320]
[310]
[320]
Cushion A
Insulator C ( )
( C)
Insulator B
( B)
POWER
Fig.19 ( )
Rear case assembly
( )
[310]: Rivet ( ) P2032B (AAX62000)
[320]: Pan Head Tapping Screw-B ( )
3.0X8 CR3 (AAX61700)
Fig.18 ( )
13
STAGEPAS 300
15. Fan (Small) (Time required: About 7 minutes)
15-1 Remove the POWER circuit board.
(See procedure 14)
15-2 Remove the shield case together with the fan
(small). (Fig.20)
15-3 Remove the four (4) screws marked [110B]. The
fan (small) can then be removed from the shield
case. (Fig.20)
* The cushion B is not a part of the fan (small).
(Fig.20)
* Connect the connector of the fan (small) to the
CN3 of the POWER circuit board.
16. Fan (Large) (Time required: About 7 minutes)
16-1 Remove the power amplifier units A and B.
(See procedures 14-1 and 14-2)
16-2 Remove the two (2) screws marked [70B]. The fan
(large) can then be removed together with the fan
bracket. (Fig.20)
16-3 Remove the four (4) screws marked [60]. The fan
(large) can then be removed from the fan bracket.
(Fig.21)
* The cushion C is not a part of the fan (large).
(Fig.21)
* Connect the connector of the fan (large) to the
CN1 of the POWER circuit board.
Fan (small)
[110B] X 4
( ( ))
Cushion C
Shield case Cushion B ( )
( ) [60] X 4
( )
to POWER circuit board - CN3
( )
Fan (large)
to POWER circuit board - CN1 ( ( ))
( )
[70B] X 2
Fan (large)
( ( ))
Fan bracket
( )
Rear case assembly [60]: Bind Head Tapping Screw-B ( )
( ) 4.0X16 CR3 (AAX62030)
[70B]: Bind Head Tapping Screw-B ( ) Fig.21 ( )
3.0X8 CR3 (AAX61980)
[110B]: Pan Head Tapping Screw-B ( )
3.0X12 CR3 (AAX62050)
Fig.20 ( )
14
STAGEPAS 300
IC BLOCK DIAGRAM IC
M65850FP (AAX62760)
Digital Echo
FILTER: IC602
CLOCK CC2 OP2 IN OP2 OUT LPF2 IN LPF2 OUT
14 7 12 11 10 9
NC 1 16 NC OSCILLATOR D/A LPF2
LPF1 IN 2 15 Vcc REF 13
1/2 Vcc
LPF1 OUT 3 14 CLOCK
OP1 OUT 4 13 REF CLOCK DO1
NC 16 MO
AUTO MAIN CONTROL
OP1 IN 5 12 OP2 IN RESET RESET MI 20Kbit
D1 DO0 SRAM
CC1 6 11 OP2 OUT NC 1
CC2 7 8
10 LPF2 IN
A/D
LPF1
GND 8 9 LPF2 OUT
2 3 4 5 6 8 15
LPF1 IN LPF1 OUT OP1 OUT OP1 IN CC1 GND Vcc
LB1407-E LF (AAX68710)
AC/DC Voltage Level Meter
VR: IC604
12, 11, 10, 9
Vref Vcc Rch D7 D6 D1
3 1 2 14 13 8
Vcc 1 14 D7
R7 R6 R1
Rch 2 13 D6
5.83 k 4.12 k 1 k
Vref 3 12 D5 -- -- --
COM COM COM
7 6 1
IN+ 4 11 D4 + + +
IN + 4
IN-- 5 10 D3
IN -- 5
OUT 6 9 D2
GND 7 8 D1
6 7
OUT GND
NJM2068M-D TE1 (AAX62750) TOP249Y (AAX63650)
Dual Operational Amplifier Switching Controller
FILTER: IC103, 107, 204, 603 POWER: IC802,804
VC
INPUT: IC101, 201, 501, 701 CONTROL (C) 1
ZC
0
7 DRAIN (D)
INTERNAL
1 SUPPLY
VR: IC102, 105, 106, 202, 203, 302, SHUNT REGULATOR/
1 ERROR AMPLIFIER +
SOFT START
402, 502, 503, 702, 703 3
+
5.8 V
4.8 V
5 5.8 V INTERNAL UV
IFB COMPARATOR
2 7 VI (LIMIT)
4 CURRENT SOFT
LIMIT
Output A 1 +V 8
+DC Voltage START
ADJUST
ON/OFF ÷8
Supply +
1: CONTROL VBG+VT
SHUTDOWN/
Inverting EXTERNAL CURRENT LIMIT
2 7 Output B 2: LINE-SENSE AUTO-RESTART
COMPARATOR
Input A - + CURRENT LIMIT (X) 3
3: EXTERNAL HYSTERETIC
Non-Inverting 3 6
Inverting CURRENT LIMIT LINE-SENSE (L) 2
STOP LOGIC THERMAL
SHUTDOWN CONTROLLED
Input A + - Input B 1V
4: SOURCE VBG TURN-ON
STOP SOFT- GATE DRIVER
-DC Voltage Supply 4 -V 5 Non-Inverting 5: FREQUENCY OV/UV START
Input B 7: DRAIN LINE DMAX
SENSE DCMAX DCMAX
CLOCK
HALF S Q LEADING
FREQUENCY (F) 5 FREQ.
SAW
R EDGE
+ BLANKING
OSCILLATOR WITH JITTER
PWM
COMPARATOR
LIGHT LOAD
RE FREQUENCY
REDUCTION
4 SOURCE (S)
15
STAGEPAS 300
CIRCUIT BOARDS
FILTER Circuit Board (6469-40) ............................................................... 22
INPUT Circuit Board (6469-40) ................................................................ 16
JACK1A Circuit Board (8143-40) ............................................................. 22
JACK1B Circuit Board (8143-40) ............................................................. 22
JACK2 Circuit Board (6469-40) ................................................................ 22
NETWORK1 Circuit Board (8143-40) ....................................................... 17
NETWORK2 Circuit Board (8143-40) ....................................................... 17
POWER Circuit Board (8143-40) ........................................................ 18/19
VR Circuit Board (6469-40) ................................................................. 20/21
Note: See parts list for details of circuit board component parts.
INPUT Circuit Board
POWERED
REC OUT SP CH1 CH2 CH3 CH4 CH5/6 CH7/8
L(MONO) L L
L
L
R R
R
R R
to VR-CN21 MIC MIC MIC MIC to VR-CN26
LINE LINE LINE LINE
Component side
407747
Pattern side
407744
16
STAGEPAS 300
NETWORK1 Circuit Board
to JACK1A-CN15
JACK1B-CN11
or
to Speaker HF
(TWEETER)
to Speaker LF
(WOOFER)
Component side Pattern side
407751, 407752 407750
NETWORK2 Circuit Board
to JACK1B-CN11
JACK1A-CN15
or
to Speaker HF
(TWEETER)
Component side
to Speaker LF
(WOOFER)
Component side Pattern side
407751, 407752 407750
17
STAGEPAS 300
POWER Circuit Board
to Power Amplifier Unit to JACK2-P13, P14, P15, P16
to POWER switch
to Power Amplifier Unit
AC IN
to FAN
to FAN
to VR-CN24
Component side
407751, 407752
18
STAGEPAS 300
POWER Circuit Board
Pattern side
407750
19
20
STAGEPAS 300
VR Circuit Board
to INPUT-CN22 to INPUT-CN25
LIMITER MONITOR OUT
HIGH HIGH HIGH HIGH HIGH HIGH
+6
+3
0
-6 REVERB LOW LOW
LOW LOW LOW LOW
-20
POWER
REVERB REVERB REVERB REVERB
SPEECH
MUSIC
LEVEL LEVEL LEVEL LEVEL LEVEL LEVEL LEVEL
Component side
MASTER