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 (See Figure 1.) --------- 3
1.4. Protection Circuitry------------------------------------------- 3
2 Warning -------------------------------------------------------------- 4
2.1. Prevention of Electrostatic Discharge (ESD)
to Electrostatically Sensitive (ES) Devices ------------ 4
2.2. Caution for AC Cord (For EB) ----------------------------- 5
2.3. Service Caution Based on Legal Restrictions --------- 6
3 Service Navigation ---------------------------------------------- 7
3.1. Service Information ----------------------------------------- 7
4 Speci ications
----------------------------------------------------- 8
5 Location of Controls and Components -------------------
10
6 Service Mode ------------------------------------------------------
13
7 Troubleshooting Guide -----------------------------------------
1
5
7.1. Main Unit (SU-HTB488/494/498) -----------------------
1
5
7.2. Active Subwoofer (SB-HWA488) ------------------------
20
8 Wiring Connection and Voltage Data ----------------------
2
2
8.1. Main Unit (SU-HTB488/494/498) -----------------------
2
2
8.2. Active Subwoofer (SB-HWA488) ------------------------
2
4
9 Service Fixture & tools -----------------------------------------
2
6
10 Disassembly and Assembly Instructions ---------------
2
7
10.1.Disassembly Flow Chart ---------------------------------
2
7
10.2.P.C.B. Positions --------------------------------------------
2
8
10.3.Disassembly Procedure of Main
Unit (SU-HTB488/494/498) ----------------------------
2
9
10.4.Disassembly Procedure of of Active
Subwoofer (SB-HWA488) --------------------------------- 3
3
11 Measurements and Adjustments --------------------------
3
5
11.1.Service Position --------------------------------------------
3
5
