SA-VK680EE, SC-VK680EE - Panasonic Audio Service Manual (repair manual)

PSG0906002CE

Product Color:  (K)...Black Type

PAGE

PAGE

1 Safety Precautions----------------------------------------------- 4

1.1. GENERAL GUIDELINES -------------------------------- 4
1.2. Before Repair and Adjustment ------------------------- 4
1.3. Protection Circuitry ---------------------------------------- 4
1.4. Safety Parts Information --------------------------------- 5

2 Warning -------------------------------------------------------------- 6

2.1. Prevention of Electrostatic Discharge (ESD)

to Electrostatic Sensitive (ES) Devices -------------- 6

2.2. Precaution of Laser Diode------------------------------- 7
2.3. Service caution based on Legal restrictions -------- 8

2.4. Handling Precautions for Traverse Unit -------------- 9

3 Service Navigation --------------------------------------------- 11

3.1. Service Information -------------------------------------- 11

4 Specifications ---------------------------------------------------- 12
5 Location of Controls and Components------------------ 14

5.1. Main Unit Key Button Operation---------------------- 14
5.2. Remote Control Key Button Operation ------------- 15
5.3. Disc Information ------------------------------------------ 16
5.4. Using the Music Port ------------------------------------ 18
5.5. DivX VOD Content--------------------------------------- 19

2

5.6. USB - Play and Recording ----------------------------- 20

6 Self-Diagnosis and Special Mode Setting -------------- 22

6.1. Service Mode Summary Table ------------------------ 22
6.2. Doctor Mode Table--------------------------------------- 24
6.3. Self-Diagnosis Mode Table  --------------------------- 25
6.4. Service Mode Table (For DVD) ----------------------- 26
6.5. DVD Self Diagnostic Function-Error Code--------- 34
6.6. Sales Demonstration Lock Function ---------------- 38

7 Troubleshooting Guide---------------------------------------- 39

7.1. Troubleshooting Guide for F61 and/or F76 -------- 39
7.2. Basic Troubleshooting Guide for Traverse

Unit (DVD Module P.C.B.)------------------------------ 45

8 Service Fixture & Tools --------------------------------------- 46

8.1. Service Tools and Equipment ------------------------- 46

9 Disassembly and Assembly Instructions --------------- 47

9.1. Disassembly flow chart  -------------------------------- 49
9.2. Main Components and P.C.B. Location ------------ 50
9.3. Disassembly of Top Cabinet--------------------------- 51
9.4. Disassembly of DVD Mechanism Unit

(CR14D) ---------------------------------------------------- 52

9.5. Disassembly of DVD Module P.C.B.----------------- 54
9.6. Disassembly of Rear Panel---------------------------- 54
9.7. Disassembly of Front Panel Assembly ------------- 55
9.8. Disassembly of Mic P.C.B. ----------------------------- 56
9.9. Disassembly of Panel P.C.B., Volume P.C.B.

& Remote Sensor P.C.B. , Side Bar (L) LED
P.C.B. and Side Bar (R) LED P.C.B.----------------- 57

9.10. Disassembly of USB P.C.B. --------------------------- 59

9.11. Disassembly of Music Port P.C.B. ------------------- 60

9.12. Disassembly of CD Lid---------------------------------- 60
9.13. Disassembly of Deck Mechanism Unit ------------- 61
9.14. Disassembly of Deck P.C.B.--------------------------- 62
9.15. Disassembly of Deck Mechanism P.C.B.----------- 62
9.16. Disassembly of Deck Mechanism-------------------- 63
9.17. Disassembly of Cassette Lid -------------------------- 72
9.18. Rectification for Tape Jam Problem ----------------- 72
9.19. Disassembly of D-Amp P.C.B. ------------------------ 73
9.20. Replacement of Audio Digital Power Amp IC

(IC5000) ---------------------------------------------------- 74

9.21. Replacement of Audio Digital Power Amp IC

(IC5200) ---------------------------------------------------- 75

9.22. Disassembly of Main P.C.B. --------------------------- 75
9.23. Disassembly of SMPS P.C.B. ------------------------- 76
9.24. Replacement of Switching Regulator IC

(IC5701) ---------------------------------------------------- 77

9.25. Replacement of Rectifier Diode (D5702)----------- 78
9.26. Replacement of Regulator Diode (D5801)--------- 80
9.27. Replacement of Regulator Diode (D5802)--------- 80
9.28. Replacement of Regulator Diode (D5803)--------- 81
9.29. Disassembly of AC Inlet P.C.B. ----------------------- 82

10 Disassembling and Assembling of Traverse Unit---- 84

10.1. Disassembly Procedures------------------------------- 84
10.2. Assembly Procedures----------------------------------- 85

11 Service Positions ----------------------------------------------- 86

11.1. Checking and Repairing of Main P.C.B. ------------ 86
11.2. Checking and Repairing Panel P.C.B., Deck

P.C.B., Volume P.C.B., Music Port P.C.B. and
Mic P.C.B.  ------------------------------------------------- 86

11.3. Checking and Repairing of D-Amp P.C.B. --------- 89
11.4. Checking and Repairing of AC Inlet P.C.B. &

SMPS P.C.B. ---------------------------------------------- 90

12 Measurements and Adjustments -------------------------- 92

12.1. Cassette Deck -------------------------------------------- 92
12.2. Tape Speed Adjustment-------------------------------- 92
12.3. Bias Voltage Check ------------------------------------- 93
12.4. Bias Frequency Check  -------------------------------- 93

13 Voltage & Waveform Chart ---------------------------------- 94

13.1. DVD Module P.C.B. (1/3) ------------------------------ 94
13.2. DVD Module P.C.B. (2/3) ------------------------------ 95
13.3. DVD Module P.C.B. (3/3) ------------------------------ 96
13.4. Main P.C.B. (1/3)----------------------------------------- 97
13.5. Main P.C.B. (2/3)----------------------------------------- 98
13.6. Main P.C.B. (3/3)----------------------------------------- 99
13.7. Panel P.C.B.---------------------------------------------- 100
13.8. Deck P.C.B. ---------------------------------------------- 100
13.9. Mic P.C.B.------------------------------------------------- 100

13.10. D-Amp P.C.B. -------------------------------------------- 101

13.11. SMPS P.C.B.--------------------------------------------- 102

13.12. Deck Mechanism P.C.B. ------------------------------ 102
13.13. Volume P.C.B. ------------------------------------------- 102
13.14. Waveform Table (1/3) ---------------------------------- 103
13.15. Waveform Table (2/3) ---------------------------------- 104
13.16. Waveform Table (3/3) ---------------------------------- 105

14 Illustration of ICs, Transistor and Diode --------------- 106
15 Block Diagram -------------------------------------------------- 107

15.1. DVD (Audio)---------------------------------------------- 107
15.2. DVD (Servo) --------------------------------------------- 108
15.3. System Control ------------------------------------------ 109
15.4. Audio------------------------------------------------------- 110
15.5. Video------------------------------------------------------- 111
15.6. Deck-------------------------------------------------------- 112
15.7. D-Amp ----------------------------------------------------- 113
15.8. Power ------------------------------------------------------ 114

16 Wiring Connection Diagram ------------------------------- 115
17 Schematic Diagram Notes ---------------------------------- 117
18 Schematic Diagram ------------------------------------------- 119

18.1. DVD Module Circuit ------------------------------------ 119
18.2. Main Circuit----------------------------------------------- 123
18.3. Panel, Side Bar (L) Led & Side Bar (R) Led

Circuit ------------------------------------------------------ 129

18.4. Volume, Music Port, Remote Sensor & Mic

Circuit ------------------------------------------------------ 130

18.5. Deck Circuit ---------------------------------------------- 131
18.6. D-Amp Circuit-------------------------------------------- 132
18.7. SMPS Circuit--------------------------------------------- 134
18.8. USB, Deck Mechanism & AC Inlet Circuit -------- 136

19 Printed Circuit Board----------------------------------------- 137

19.1. DVD Module P.C.B. ------------------------------------ 137
19.2. Main P.C.B.----------------------------------------------- 138
19.3. Panel, Side Bar (L) Led & Side Bar (R) Led

P.C.B. ------------------------------------------------------ 139

19.4. Volume, Music Port, Remote Sensor, Mic &

USB P.C.B. ----------------------------------------------- 140

19.5. Deck, Deck Mechanism & AC Inlet P.C.B. ------- 141
19.6. D-Amp P.C.B. -------------------------------------------- 142
19.7. SMPS P.C.B.--------------------------------------------- 143

20 Terminal Function of ICs ------------------------------------ 145

20.1. IC2801 (RFKWMVK480GC): IC

MICROPROCESSOR --------------------------------- 145

20.2. IC6601(C0HBB0000057): IC FL Driver ----------- 145

21 Exploded View and Replacement Parts List---------- 147

3

21.1. Exploded View and Mechanical Replacement

Part List --------------------------------------------------- 147

21.2. Electrical Replacement Part List-------------------- 153

4

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. 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 chassis, the reading must be 

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

µ

F 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

Disconnect AC power to discharge unit AC Capacitors as such (C5700, C5701, C5703, C5704, C5705, C5706, C5707) through a
10 

Ω

, 10 W resistor to ground.

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 230V, 50 Hz at power on (in FM Tuner, no signal at volume minimum) should be ~ 500 mA.

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 wires are