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2 8.2. Self Diagnostic Function Error Code ---------------- 18
8.3. Doctor Mode Table --------------------------------------- 19
8.4. Sales Demonstration Lock Function Mode -------- 27
9 Service Fixture & Tools---------------------------------------28
10 Disassembly and Assembly Instructions---------------29
10.1. Disassembly flow chart --------------------------------- 30
10.2. Types of Screws ------------------------------------------ 30
10.3. Main Parts Location Diagram ------------------------- 31
10.4. Disassembly of Top Cabinet Assembly ------------- 32
10.5. Disassembly of Tuner P.C.B. -------------------------- 34
10.6. Disassembly of SMPS Unit ---------------------------- 35
10.7. Disassembly of SMPS P.C.B. ------------------------- 36
10.8. Replacement of Transistor (Q512) ------------------ 37
10.9. Disassembly of Front Panel Assembly ------------- 39
10.10. Disassembly of Bass Button P.C.B., Function
Button P.C.B. and Panel P.C.B.----------------------- 41
10.11. Replacement of CD Lid --------------------------------- 43
10.12. Disassembly of Main P.C.B. --------------------------- 44
10.13. Disassembly of CD Mechanism Unit
(DLS6CE) -------------------------------------------------- 45
10.14. Disassembly of CD Servo P.C.B.--------------------- 46
11 Disassembly and Assembly of Traverse Unit---------48
11.1. Disassembling Procedures ---------------------------- 48
11.2. Assembling Procedures -------------------------------- 49
12 Service Position-------------------------------------------------51
12.1. Checking and Repairing of SMPS P.C.B. (B
Side) --------------------------------------------------------- 51
12.2. Checking and Repairing of Panel P.C.B. ----------- 51
12.3. Checking and Repairing of Main P.C.B. (A
Side) --------------------------------------------------------- 52
12.4. Checking and Repairing of Main P.C.B. (B
Side) --------------------------------------------------------- 53
12.5. Checking and Repairing of CD Servo P.C.B.------ 54
13 Overall Simplified Block--------------------------------------55
13.1. Control Signal Diagram --------------------------------- 55
13.2. Block Connection Diagram ---------------------------- 56
14 Block Diagram---------------------------------------------------57
14.1. SERVO & SYSTEM CONTROL BLOCK
DIAGRAM -------------------------------------------------- 57
14.2. AUDIO BLOCK DIAGRAM ---------------------------- 58
14.3. POWER SUPPLY BLOCK DIAGRAM -------------- 59
15 Wiring Connection Diagram---------------------------------60
16 Schematic Diagram---------------------------------------------61
16.1. Schematic Diagram Notes ----------------------------- 61
16.2. CD SERVO CIRCUIT ----------------------------------- 63
16.3. MAIN (MICON) CIRCUIT (1/4)------------------------ 64
16.4. MAIN (MICON) CIRCUIT (2/4)------------------------ 65
16.5. MAIN (MICON) CIRCUIT (3/4)------------------------ 66
16.6. MAIN (MICON) CIRCUIT (4/4)------------------------ 67
16.7. MAIN (USB) CIRCUIT ---------------------------------- 68
16.8. PANEL, FUNCTION BUTTON & BASS
BUTTON CIRCUIT--------------------------------------- 69
16.9. TUNER CIRCUIT----------------------------------------- 70
16.10. SMPS CIRCUIT ------------------------------------------ 71
17 Printed Circuit Board------------------------------------------72
17.1. CD SERVO P.C.B. --------------------------------------- 72
17.2. MAIN & TUNER P.C.B. (Side A)---------------------- 73
17.3. MAIN / TUNER P.C.B. (Side B) ----------------------- 74
17.4. PANEL, FUNCTION BUTTON & BASS
BUTTON P.C.B. ------------------------------------------ 75
17.5. SMPS P.C.B. ---------------------------------------------- 7618 Appendix Information of Schematic Diagram--------77
18.1. Voltage Measurement & Waveform Chart --------- 77
18.2. Illustration of ICs, Transistors and Diodes -------- 83
18.3. Terminal Function of ICs ------------------------------ 84
19 Exploded View and Replacement Parts List-----------87
19.1. Exploded View and Mechanical replacement
Parts List --------------------------------------------------- 87
19.2. Electrical Replacement Parts List ------------------- 91
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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 1MΩ and 5.2MΩ. 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 1.5kΩ, 10 watts resistor, in parallel with a 0.15μF 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
