Infinity Prelude MTS Center User manual

PRELUDE MTS
SUBWOOFER
SERVICE MANUAL
Infinity Systems, Inc
250 Crossways Park Dr.
Woodbury, New York 797REV 66/2007

Prelude MTS
CONTENTS
SPECIFICATIONS …….……………….…………….………………….3
DETAILED SPECIFICATIONS ……………………..…………………4
CONTROLS & CONNECTIONS ………………………………………6
OPERATION/AMPLIFIER REMOVAL……… ..……..…..…….…….10
MECHANICAL/PACKING PARTS LIST………………..….…………11
EXPLODED VIEW ………………………………………..……………13
PACKAGING ……………………………..…………….…………….…14
PRELUDE MTS ADJUST BIAS PROCEDURE…….…..……….………15
ELECTRICAL PARTS LIST (120v)……………….….…..….…………16
INTEGRATED CIRCUIT DIAGRAMS …………….….………………24
PRINTED CIRCUIT BOARD DIAGRAMS….……….……..…………25
SCHEMATICS……………….…..……….……….….…………………29
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Prelude MTS Subwoofer Specifications

Prelude MTS Subwoofer
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Detailed Specifications

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Detailed Specifications (Cont )

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Prelude MTS Subwoofer
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Operation
Amplifier Removal

Mechanical & Packaging Parts List
1 Cabinet Prelude MTS Subwoofer (Not for Sale)
2 Low Frequency Transducer
(Woofer)
12” Cast frame C.M.M.D., Shielded
DC Resistance 7.6 ohms ±10% 335036-001
3 Complete Subwoofer Amp assembly Not For Sale
4 Woofer Grille retainers (4) 66815-01
5 Woofer gasket 335481-001
6 Woofer Grille 335037-001
7Cosmetic Cap Logo 335351-001
8 Woofer Trim Ring 335040-001
9 Front Foot 335038-001
10 Rear Foot 335244-001
11 Terminal Connector Plate 335379-001
12 Cosmetic Cap 335256-001
13 Cosmetic Cap Gasket 335360-001
14 Cosmetic Cap Grille retainers (3) 333249-001
15 Binding Post, BLK, Tower Conn. 335358-001
16 Binding Post, RED, Tower Conn. 335358-002
17 Binding Post, BLK, Rear Panel JC0151
18 Binding Post, RED, Rear panel JC0150
19 Subwoofer Outer Carton 335059-001
20 Subwoofer Top End Pad 335058-001
21 Subwoofer Bottom End Pad 335058-002
22 System Owner’s manual 335060-005
23 Warranty Card 335841-001
24 Survey Card 335868-002
25 Power Cord WI0043
26 Double-ended Banana Plug 335357-001
27 Hardware Kit 335849-001
28 Alignment Pins (2) 335348-001
29 Spike foot set 331360-001
30 T-Handle Allen Key 335851-001
31 RABOS Complete kit 335852-001
32 RABOS Test CD 335855-001
33 RABOS Sound Level Meter 335368-001
34 RABOS Key (Screwdriver) 091-00121-000
35 RABOS Q-Finder 335856-001
36 RABOS Pouch 335853-001
9 Volt Battery
Prelude MTS Subwoofer

Mechanical & Packaging Parts List (Cont’d)
38 Connector Plate 335249-001
39 Connector Plate Gasket 335355-002
S1 Screw (4) PPH #10-32 x 1 BLK 900401-016
S2 Screw (4) PPH #10-32 x .75 BLK 900401-012
S3 Screw (8) PB FPH #10 x .625 BLK 908401-010
S4 Screw (2) PB FPH #10 x .75 BLK 908401-012
S5 Screw (8) PB FPH #6 x .5 BLK 903901-008
S6 Screw (2) MS PPH #10-32 x .625 BLK 900401-010
S7 Screw (7) PPH #8 x .75 BLK 900101-012
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Packaging

PRELUDE MTS ADJUST BIAS PROCEDURE
(Mandatory when any output MOSFET transistors Q305,310,320,321,306,307,311,312 are replaced)
1. Amplifier should be unplugged and OFF.
2. Remove Amp assembly from cabinet, following the instructions on Page 10.
3. Identify the Linear board assembly (PCB with the output transistors)
4. Adjust RP301 and RP302 fully Counter Clockwise. See diagram below.
5. Apply 120 VAC power to unit; turn power switch ON.
6. Verify LED illuminates on the front gain control dial, unless you have disconnected the plug.
7. Connect voltmeter set to DC millivolt range to twin pins on terminal J303, on Linear board.
8. Verify initial voltage is less then 0.1 mV.
9. Adjust RP301 Clockwise until voltmeter reads 0.3 mV + the initial current from step #8.
10. Adjust RP302 Clockwise until voltmeter now reads 0.6 mV + the initial current from step #8.
11. Turn amplifier OFF. Disconnect AC power to unit.
12. Remove voltmeter from terminal J303.
13. Replace amp assembly back into cabinet.

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Prelude Amp Assembly Parts List
Part# Description Qty Designator

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Prelude Amp Assembly Parts List (Cont )
Part# Description Qty Designator

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Prelude Amp Assembly Parts List (Cont )
Part# Description Qty Designator

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Prelude Amp Assembly Parts List (Cont )
Part# Description Qty Designator