2
TABLE OF CONTENTS
PAGE
1 Safety Precautions ----------------------------------------------- 3
1.1. General Guidelines ----------------------------------------- 3
1.2. Leakage Current Cold Check ----------------------------- 3
1.3. Leakage Current Hot Check ------------------------------- 3
1.4. Protection Circuitry------------------------------------------- 3
2 Warning -------------------------------------------------------------- 4
2.1. Prevention of Electrostatic Discharge (ESD)
to Electrostatically Sensitive (ES) Devices ------------ 4
2.2. Service Caution Based on Legal Restrictions --------- 5
3 Service Navigation ---------------------------------------------- 6
3.1. Service Information ----------------------------------------- 6
3.2. How to Update Software ----------------------------------- 6
4 Specifications
----------------------------------------------------- 8
5 Location of Controls and Components ------------------ 9
6 Service Mode ------------------------------------------------------ 11
7 Troubleshooting Guide ----------------------------------------- 13
7.1. Main Unit (SU-HTB250) ----------------------------------- 13
7.2. Active Subwoofer (SB-HWA250) ------------------------ 18
8 Wiring Connection and Voltage Data ---------------------- 19
8.1. Main Unit (SU-HTB250) ----------------------------------- 19
8.2. Active Subwoofer (SB-HWA250) ------------------------ 21
9 Disassembly and Assembly Instructions ----------------- 23
9.1.Disassembly Flow Chart ----------------------------------- 23
9.2.P.C.B. Positions ---------------------------------------------- 24
9.3.Disassembly Procedure of Main
Unit
(SU-HTB250) ------------------------------------------------ 25
9.4.Disassembly Procedure of of Active Subwoofer
(SB-HWA250) ------------------------------------------------ 30
10 Exploded View and Replacement Parts List ----------- 32
10.1. Casing Parts & Mechanism Section
(SU-HTB250) ----------------------------------------------- 32
10.2. Casing Parts & Mechanism Section
(SB-HWA250) ---------------------------------------------- 33
10.3. Packing & Accessories Section
(SU-HTB250) ----------------------------------------------- 34
10.4. Replacement Parts List ---------------------------------- 35
