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PSG0907003CE
Compact Stereo System
Model No. SC-HC4GK
SC-HC4GT
Product Color: (S)...Silver Type
TABLE OF CONTENTS
PAGE PAGE
1 Safety Precautions----------------------------------------------- 3 6.1. Disc and MP3 Information ----------------------------- 13
1.1. General Guidelines---------------------------------------- 3 7 Self diagnosis and special mode setting --------------- 14
1.2. Before Repair and Adjustment ------------------------- 4 7.1. Service Mode Summary Table------------------------ 14
1.3. Caution For Fuse Replacement------------------------ 4 7.2. Service Mode Table ------------------------------------- 15
1.4. Protection Circuitry ---------------------------------------- 4 7.3. Error Code Table ----------------------------------------- 18
1.5. Safety Part Information----------------------------------- 4 8 Troubleshooting Guide --------------------------------------- 19
2 Warning -------------------------------------------------------------- 6 8.1. CD Door Unit Jam--------------------------------------- 19
2.1. Prevention of Electro Static Discharge (ESD) 9 Disassembly and Assembly Instructions--------------- 21
to Electrostatically Sensitive (ES) Devices---------- 6 9.1. Disassembly flow chart --------------------------------- 22
2.2. Precaution of Laser Diode------------------------------- 7 9.2. Type of Screw--------------------------------------------- 23
2.3. Service caution based on Legal restrictions -------- 8 9.3. Main Parts Location Diagram ------------------------- 23
3 Service Navigation ----------------------------------------------- 9 9.4. Disassembly of CD Door Unit------------------------- 24
3.1. Service Information --------------------------------------- 9 9.5. Disassembly of Net Frame Assembly--------------- 26
4 Specifications ----------------------------------------------------10 9.6. Disassembly of Top Ornament------------------------ 28
5 Location of Controls and Components ------------------11 9.7. Disassembly of Bottom Ornament ------------------- 29
5.1. Main Unit Key Button Operations--------------------- 11 9.8. Disassembly of Speaker Unit (SP1) ----------------- 30
5.2. Remote Control Key Button Operations ------------12 9.9. Disassembly of Speaker Unit (SP2) ----------------- 31
6 Operating Instructions-----------------------------------------13 9.10. Disassembly of Panel 1 & Panel 2 P.C.B. --------- 33
9.11. Disassembly of Front Panel Block ------------------- 35 17.5. MAIN CIRCUIT (4/4) ----------------------------------- 102
9.12. Disassembly of Tuner Pack --------------------------- 35 17.6. FL CIRCUIT, PANEL 1 CIRCUIT and PANEL
9.13. Disassembly of SMPS Unit ---------------------------- 36 2 CIRCUIT------------------------------------------------ 103
9.14. Disassembly of AC IN P.C.B.-------------------------- 37 17.7. TUNER CIRCUIT, AUX/HP CIRCUIT, IR
9.15. Disassembly of SMPS P.C.B. ------------------------- 39 CIRCUIT, MOTOR CIRCUIT, POSITION SW
9.16. Replacement of Switching Regulator IC CIRCUIT and iPod SW CIRCUIT------------------- 104
(IC702) ------------------------------------------------------ 40 17.8. iPod CIRCUIT and AC IN CIRCUIT---------------- 105
9.17. Replacement of Diode (D702) ------------------------ 42 17.9. D-AMP CIRCUIT---------------------------------------- 106
9.18. Replacement of Diode (D704) ------------------------ 44 17.10. SMPS CIRCUIT ----------------------------------------- 107
9.19. Disassembly of Main P.C.B. --------------------------- 46 17.11. USB CIRCUIT ------------------------------------------- 108
9.20. Disassembly of Fan-------------------------------------- 49 18 Printed Circuit Board----------------------------------------- 109
9.21. Disassembly of AUX / HP P.C.B.--------------------- 49 18.1. CD SERVO P.C.B.-------------------------------------- 109
9.22. Disassembly of Traverse Deck ----------------------- 50 18.2. MAIN P.C.B. (1/2)--------------------------------------- 110
9.23. Disassembly of Traverse Cover & Traverse 18.3. MAIN P.C.B. (2/2)--------------------------------------- 111
Unit----------------------------------------------------------- 51 18.4. TUNER P.C.B., FL P.C.B., PANEL 1 P.C.B.,
9.24. Disassembly of CD Servo P.C.B.--------------------- 52 PANEL 2 P.C.B., AUX/HP P.C.B. and IR
9.25. Disassembly of D-Amp P.C.B. ------------------------ 53 P.C.B. ------------------------------------------------------ 112
9.26. Disassembly of Fan Unit (iPod) ---------------------- 53 18.5. MOTOR P.C.B., POSITION SW P.C.B., iPod
9.27. Disassembly of USB Module Assembly ------------ 55 SW P.C.B., iPod P.C.B. and D-AMP P.C.B. ------ 113
9.28. Disassembly of USB P.C.B. --------------------------- 55 18.6. SMPS P.C.B., AC IN P.C.B. and USB P.C.B. ---- 114
9.29. Disassembly of SD Lid---------------------------------- 56 19 Terminal Function of IC's ----------------------------------- 115
9.30. Disassembly of FL P.C.B. ------------------------------ 57 19.1. IC801 (RFKWMAHC4EP) MICRO
9.31. Disassembly of iPod P.C.B.---------------------------- 58 PROCESSOR IC --------------------------------------- 115
9.32. Disassembly of Motor P.C.B. -------------------------- 61 19.2. IC7001 (MN6627954AMA) IC SERVO
9.33. Disassembly of Position SW P.C.B. ----------------- 62 PROCESSOR ------------------------------------------- 116
9.34. Disassembly of iPod SW P.C.B. ---------------------- 63 19.3. IC7002 (BA5948FPE2) IC 4CH Drive ------------- 117
9.35. Disassembly of IR P.C.B.------------------------------- 64 20 Exploded View and Replacement Parts List---------- 118
10 Service Position ------------------------------------------------- 66 20.1. Exploded View and Mechanical replacement
10.1. Checking and Repairing Main P.C.B. --------------- 66 Parts List -------------------------------------------------- 118
10.2. Checking and Repairing D-Amp P.C.B.------------- 73 20.2. Electrical Replacement Parts List ------------------ 124
10.3. Checking and Repairing FL P.C.B. ------------------ 74
10.4. Checking and Repairing CD Servo P.C.B. --------- 74
10.5. Checking and Repairing USB P.C.B.---------------- 75
10.6. Checking and Repairing AC IN P.C.B. -------------- 75
10.7. Checking and Repairing SMPS P.C.B. ------------- 78
11 Voltage Measurement & Waveform Chart--------------- 80
11.1. CD SERVO P.C.B. --------------------------------------- 80
11.2. D-AMP P.C.B. --------------------------------------------- 81
11.3. FL P.C.B. --------------------------------------------------- 81
11.4. MAIN P.C.B. (1/3) ---------------------------------------- 82
11.5. MAIN P.C.B. (2/3) ---------------------------------------- 83
11.6. MAIN P.C.B. (3/3) ---------------------------------------- 84
11.7. SMPS P.C.B. ---------------------------------------------- 84
11.8. USB P.C.B.------------------------------------------------- 85
11.9. Waveform Chart ------------------------------------------ 86
12 Illustration of IC's, Transistors and Diodes ------------ 88
13 Overall Simplified Block -------------------------------------- 89
14 Block Diagram --------------------------------------------------- 92
14.1. CD SERVO BLOCK DIAGRAM ---------------------- 92
14.2. MAIN (1/2) / TUNER / iPod / FL / MOTOR /
USB BLOCK DIAGRAM -------------------------------- 93
14.3. MAIN (2/2) / D-AMP BLOCK DIAGRAM ----------- 94
14.4. PANEL1/2 / AUX/HP / IR / SMPS / AC IN
BLOCK DIAGRAM --------------------------------------- 95
15 Wiring Connection Diagram --------------------------------- 96
16 Schematic Diagram Notes ----------------------------------- 97
17 Schematic Diagram--------------------------------------------- 98
17.1. CD SERVO CIRCUIT ----------------------------------- 98
17.2. MAIN CIRCUIT (1/4) ------------------------------------ 99
17.3. MAIN CIRCUIT (2/4) ---------------------------------- 100
17.4. MAIN CIRCUIT (3/4) ---------------------------------- 101
2
1 Safety Precautions
1.1. General Guidelines
1. When servicing, observe the original lead dress. If a short circuit is found, replace all parts which have been overheated or
damaged by the short circuit.
2. After servicing, see to it that all the protective devices such as insulation barriers, insulation papers shields are properly
installed.
3. After servicing, carry out the following leakage current checks to prevent the customer from being exposed to shock hazards.
1.1.1. Leakage Current Cold Check
1. Unplug the AC cord and connect a jumper between the two prongs on the plug.
2. measure the resistance value, with an ohmmeter between the jumpered AC plug and each exposed metallic cabinet part on
the equipment such as screwheads, connectors, control shafts, etc. When the exposed metallic part has a return path to the
chassis, the reading should be between 1M and 5.2M. When the exposed metal does not have a return path to the chas-
sis, the reading must be
1.1.2. Leakage Current Hot Check
1. Plug the AC cord directly into the AC outlet. Do not use an isolation transformer for this check.
2. Connect a 1.5k, 10 watts resistor, in parallel with a 0.15F capacitors, between each exposed metallic part on the set and a
good earth ground such as a water pipe, as shown in Figure 1.
3. Use an AC voltmeter, with 1000 ohms/volt or more sensitivity, to measure the potential across the resistor.
4. Check each exposed metallic part, and measure the voltage at each point.
5. Reverse the AC plug in the AC outlet and repeat each of the above measurements.
6. The potential at any point should not exceed 0.75 volts RMS. A leakage current tester (Simpson Model 229 or equivalent)
may be used to make the hot checks, leakage current must not exceed 1/2 milliamp. In case a measurement is outside of the
limits specified, there is a possibility of a shock hazard, and the equipment should be repaired and rechecked before it is
returned to the customer.
Figure. 1
3
1.2. Before Repair and Adjustment
Disconnect AC power, discharge unit AC Capacitors as such C702, C710, C725, C727, C728, C730 and C736 through a 10W, 1W
resistor to ground.
Caution : DO NOT SHORT-CIRCUIT DIRECTLY (with a screwdriver blade, for instance), as this may destroy solid state devices.
After repairs are completed, restore power gradually using a variac, to avoid overcurrent.
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