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7.5. Error Code Table ----------------------------------------- 20
8 Troubleshooting Guide ---------------------------------------- 21
9 Service Fixture & Tools --------------------------------------- 22
10 Disassembly and Assembly Instructions ---------------23
10.1. Disassembly flow chart --------------------------------- 24
10.2. Main Parts Location Diagram ------------------------- 25
10.3. Disassembly of Top Cabinet Assembly ------------- 26
10.4. Disassembly of Headphone P.C.B. ------------------ 28
10.5. Disassembly of iPod P.C.B.---------------------------- 28
10.6. Disassembly of De ck Mechanism Unit ------------- 29
10.7. Disassembly of Cassette Lid -------------------------- 30
10.8. Disassembly of Fr ont Panel Assembly ------------- 31
10.9. Disassembly of USB P.C.B. --------------------------- 32
10.10. Disassembly of Panel P.C.B. -------------------------- 33 10.11. Disassembly of FL Window---------------------------- 34
10.12. Disassembly of Centre Ornament ------------------- 35
10.13. Disassembly of CD Lid---------------------------------- 35
10.14. Disassembly of CD Mechanism Unit (DLS6C) --- 36
10.15. Disassembly of Power P.C.B. ------------------------- 37
10.16. Replacement of Power Amp IC (IC5101) ---------- 38
10.17. Disassembly of Main P.C.B. --------------------------- 39
10.18. Disassembly of Fan Unit ------------------------------- 41
10.19. Disassembly of Transformer P.C.B. ----------------- 42
10.20. Replacement of Transistor (Q5901) ----------------- 44
10.21. Disassembly of Deck P.C.B. --------------------------- 45
10.22. Disassembly of Deck Mechanism P.C.B.----------- 46
10.23. Disassembly of Deck Mechanism Unit ------------- 48
10.24. Disassembly of CD Servo P.C.B.--------------------- 56
11 Disassembly and Assembly of Traverse Unit ---------58
11.1. Disassembling Procedures ---------------------------- 58
11.2. Assembling Procedure---------------------------------- 59
12 Service Position ------------------------------------------------- 61
12.1. Checking & Repairing Deck Mechanism P.C.B.-------------------------------------------------------- 61
12.2. Checking & Repairing Deck P.C.B. ------------------ 62
12.3. Checking & Repairing USB P.C.B. ------------------- 63
12.4. Checking & Repairing Panel P.C.B. ----------------- 65
12.5. Checking & Repairing CD Servo P.C.B. ------------ 66
12.6. Checking & Repairing Power P.C.B. ---------------- 67
12.7. Checking & Repairing Transformer P.C.B. --------- 69
12.8. Checking & Repairing Main P.C.B. ------------------ 71
13 Procedure for Checking Operation of Individual Parts of Deck Mechanism Unit -----------------------------72
13.1. Operation Check with Cassette Tape --------------- 72
13.2. Operation Check without Cassette Tape ----------- 73
14 Measurements and Adjustments --------------------------74
14.1. Cassette Deck Section --------------------------------- 74
15 Voltage Measurement & Waveform Chart ---------------76
15.1. DECK P.C.B. ---------------------------------------------- 76
15.2. DECK MECHANISM P.C.B. --------------------------- 76
15.3. MAIN P.C.B. (1/2) ---------------------------------------- 77
15.4. MAIN P.C.B. (2/2) ---------------------------------------- 78
15.5. PANEL P.C.B. --------------------------------------------- 79
15.6. POWER P.C.B. ------------------------------------------- 79
15.7. TRANSFORMER P.C.B.-------------------------------- 79
15.8. USB P.C.B.------------------------------------------------- 80
15.9. Waveform Chart ------------------------------------------ 81
16 Illustration of ICs, Transistors and Diodes ------------82
17 Overall Simplified Block for PM48 -------------------------83
18 Block Diagram --------------------------------------------------- 84
18.1. CD SERVO BLOCK DIAGRAM ---------------------- 84 18.2. DECK/ DECK MECHANISM/ iPod BLOCK
DIAGRAM ------------------------------------------------- 85
18.3. MAIN(1/2)/ PANEL/TRANSFORMER BLOCK DIAGRAM ------------------------------------------------- 86
18.4. MAIN(2/2)/ HEADPHONE/ USB BLOCK DIAGRAM ------------------------------------------------- 87
19 Wiring Connection Diagram --------------------------------88
20 Schematic Diagram Notes -----------------------------------89
21 Schematic Diagram -------------------------------------------- 90
21.1. CD SERVO CIRCUIT ----------------------------------- 90
21.2. MAIN CIRCUIT (1/4) ------------------------------------ 91
21.3. MAIN CIRCUIT (2/4) ------------------------------------ 92
21.4. MAIN CIRCUIT (3/4) ------------------------------------ 93
21.5. MAIN CIRCUIT (4/4) ------------------------------------ 94
21.6. PANEL CIRCUIT, HEADPHONE CIRCUIT and DECK MECHANISM CIRCUIT ----------------- 95
21.7. DECK CIRCUIT ------------------------------------------ 96
21.8. USB CIRCUIT -------------------------------------------- 97
21.9. iPod CIRCUIT and POWER CIRCUIT ------------- 98
21.10. TRANSFORMER CIRCUIT --------------------------- 99
22 Printed Circuit Board ----------------------------------------- 100
22.1. CD SERVO P.C.B. and TRANSFORMER P.C.B. ------------------------------------------------------ 100
22.2. MAIN P.C.B. ---------------------------------------------- 101
22.3. PANEL P.C.B., HEADPHONE P.C.B. and POWER P.C.B. ------------------------------------------ 102
22.4. DECK P.C.B., DECK MECHANISM P.C.B., iPod P.C.B. and USB P.C.B. ------------------------- 103
23 Terminal Function of ICs -----------------------------------104
23.1. IC7001 (MN6627954AMA) IC SERVO PROCESSOR ------------------------------------------- 104
23.2. IC7002 (BA5948FPE2) IC 4CH Drive ------------- 105
23.3. IC800 (RFKWMPM48EG) IC MICRO- PROCESSOR ------------------------------------------- 105
24 Exploded View and Replacement Parts List ----------107
24.1. Exploded View and Mechanical replacement Parts List -------------------------------------------------- 107
24.2. Electrical Replacem ent Parts List ------------------ 111
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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 ordamaged by the short circuit.
2. After servicing, see to it that all the protective devices such as insulation barriers, insulation papers shields are properl y
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 Ω and 5.2M Ω. 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 Ω, 10 watts resistor, in parallel with a 0.15 μF 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
1.2. Before Repair and Adjustment
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.
- Current consumption at AC 220-240V, at 50Hz in NO SIGNAL mode (at volume min in FM Tuner mode) should be ~150 mA.
1.3. Protection Circuitry
The protection circuitry may have operated if either of the following conditions are noticed:- No sound is heard when the power is turned on.
- Sound stops during a performance.
The function of this circuitry is to prevent circuitry damage if, for example, the positive and negative speaker connection wir es are
"shorted", or if speaker systems with an impedance less than the indicated rated impedance of the amplifier are used.
If this occurs, follow the procedure outlines below: 1. Turn off the power.
2. Determine the cause of the problem and correct it.
3. Turn on the power once again after one minute.
Note:
When the protection circuitry functions, the unit will not operate unless the power is first turned off and then on again.
