DOWNLOAD Panasonic SA-MAX370PU / SA-MAX770PU / SC-MAX370 / SC-MAX770 Service Manual ↓ Size: 8.62 MB | Pages: 115 in PDF or view online for FREE

PSG1402009CE

Product Color:  (K)...Black Type 

PAGE

PAGE

1 Safety Precautions----------------------------------------------- 3

1.1. General Guidelines---------------------------------------- 3
1.2. Before Repair and Adjustment ------------------------- 3
1.3. Protection Circuitry ---------------------------------------- 4
1.4. Caution For Fuse Replacement------------------------ 4
1.5. Safety Parts Information  -------------------------------- 5

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

2.1. Prevention of Electrostatic Discharge (ESD)

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

2.2. Precaution of Laser Diode------------------------------- 7
2.3. General description about Lead Free Solder

(PbF)---------------------------------------------------------- 7

2.4. Handling Precautions for Traverse Ass’y ------------ 8

2.5. Grounding for electrostatic breakdown

prevention---------------------------------------------------- 8

3 Service Navigation --------------------------------------------- 10

3.1. Service Information -------------------------------------- 10
3.2. Firmware Update Procedure -------------------------- 10

4 Specifications ---------------------------------------------------- 11
5 Location of Controls and Components------------------ 12

5.1. Remote Control Key Button Operation ------------- 12
5.2. Main Unit Key Button Operation---------------------- 13

6 Service Mode ----------------------------------------------------- 14

6.1. Cold-Start -------------------------------------------------- 14
6.2. Sales Demonstration Lock Function ---------------- 14
6.3. Doctor Mode Table--------------------------------------- 16
6.4. Self-Diagnostic Mode ----------------------------------- 19







2

6.5. Self-Diagnostic Error Code Table -------------------- 19

7 Troubleshooting Guide---------------------------------------- 21

7.1. No Power or No Display -------------------------------- 21
7.2. Bluetooth® Pairing Failure ----------------------------- 21
7.3. No Key Function------------------------------------------ 21
7.4. No Remote Control Function -------------------------- 22
7.5. No NFC ----------------------------------------------------- 22
7.6. USB Device Cannot Detect---------------------------- 22
7.7. No Output Sound----------------------------------------- 23
7.8. Check Point------------------------------------------------ 24

8 Disassembly and Assembly Instructions --------------- 25

8.1. Type of Screws ------------------------------------------- 25
8.2. Disassembly Flow Chart-------------------------------- 26
8.3. Main Components and P.C.B. Locations ----------- 27
8.4. Disassembly of Top Cabinet--------------------------- 28
8.5. Disassembly of Front Panel Unit --------------------- 29
8.6. Disassembly of FL Display P.C.B. ------------------- 30
8.7. Disassembly of Illumination Jog P.C.B.------------- 30
8.8. Disassembly of Illumination Left P.C.B.------------- 31
8.9. Disassembly of Bluetooth/NFC Kit------------------- 31

8.10. Disassembly of Volume Jog P.C.B. ------------------ 31

8.11. Disassembly of Illumination Right P.C.B.----------- 32

8.12. Disassembly of USB P.C.B. --------------------------- 32
8.13. Disassembly of Mic P.C.B. ----------------------------- 33
8.14. Disassembly of DJ Cabinet Unit---------------------- 33
8.15. Disassembly of Button Left P.C.B. ------------------- 34
8.16. Disassembly of Multi Control P.C.B.----------------- 35
8.17. Disassembly of Button Right P.C.B. ----------------- 35
8.18. Disassembly of SMPS P.C.B. ------------------------- 36
8.19. Disassembly of Inner Chassis Unit ------------------ 36
8.20. Disassembly of Main P.C.B. --------------------------- 37
8.21. Disassembly of CD Mechanism Unit ---------------- 38
8.22. Disassembly of CD Interface P.C.B.----------------- 39

9 Service Position ------------------------------------------------- 40

9.1. Checking of FL Display P.C.B., Button Left

P.C.B., Button Right P.C.B. and Multi Control
P.C.B.-------------------------------------------------------- 40

9.2. Checking of SMPS P.C.B.------------------------------ 41
9.3. Checking of Main P.C.B.-------------------------------- 41

10 Block Diagram --------------------------------------------------- 43

10.1. System Control ------------------------------------------- 43
10.2. Audio -------------------------------------------------------- 47
10.3. Power Supply --------------------------------------------- 49

11 Wiring Connection Diagram --------------------------------- 51

12 Schematic Diagram--------------------------------------------- 53

12.1. Schematic Diagram Notes ----------------------------- 53
12.2. Main (I/O Expansion/Fan LED/DSP/Amp BTL/

MICON/Amp Single/FE/Karaoke/Digital-
Power/USB/AUX Tuner) Circuit ---------------------- 55

12.3. Illumination Left, Illumination Right, Button

Right & USB Circuit-------------------------------------- 70

12.4. FL Display Circuit ---------------------------------------- 71
12.5. Volume Jog & Multi Control Circuit ------------------ 72
12.6. Button Left Circuit ---------------------------------------- 73
12.7. Mic, Illumination Jog & CD Interface Circuit ------- 74
12.8. SMPS Circuit ---------------------------------------------- 75

13 Printed Circuit Board ------------------------------------------ 77

13.1. Main P.C.B. ------------------------------------------------ 77
13.2. Illumination Left, Illumination Right & FL

Display P.C.B. --------------------------------------------- 79

13.3. Button Left, Button Right, Mic & USB P.C.B. ------ 80

13.4. Volume Jog, Illumination Jog, Multi Control &

CD Interface P.C.B. ------------------------------------- 81

13.5. SMPS P.C.B.---------------------------------------------- 82

14 Appendix Information of Schematic Diagram -------- 83

14.1. Voltage & Waveform Chart ---------------------------- 83

15 Exploded View and Replacement Parts List----------- 93

15.1. Cabinet Parts Location 1------------------------------- 93
15.2. Cabinet Parts Location 2------------------------------- 94
15.3. Cabinet Parts Location 3------------------------------- 95
15.4. Packaging (SC-MAX370PUK)------------------------ 96
15.5. Packaging (SC-MAX770PUK)------------------------ 97
15.6. Mechanical Replacement Part List ------------------ 99
15.7. Electrical Replacement Part List -------------------- 101

3

1. IMPORTANT SAFETY NOTICE

There are special components used in this equipment which are important for safety. These parts are marked by   in the
Schematic Diagrams, Circuit Board Layout, Exploded Views and Replacement Parts List. It is essential that these critical parts
should be replaced with manufacturer’s specified parts to prevent X-RADIATION, shock, fire, or other hazards. Do not modify
the original design without permission of manufacturer.

2. An Isolation Transformer should always be used during the servicing of AC Adaptor whose chassis is not isolated from the AC

power line. Use a transformer of adequate power rating as this protects the technician from accidents resulting in personal
injury from electrical shocks. It will also protect AC Adaptor from being damaged by accidental shorting that may occur during
servicing.

3. 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.

4. After servicing, see to it that all the protective devices such as insulation barriers, insulation papers shields are properly

installed.

5. After servicing, make 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



 and 5.2M



.

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



, 10 watts resistor, in parallel with a 0.15



F capacitors, between each exposed metallic part on the set and a

good earth ground such as a water pipe, as shown in Figure 1-1.

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

Disconnect AC power to discharge the AC Capacitors (C1001, C1002, C1003, C1004, C1006, C1518) through a 10 



, 10 W resis-

tor 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.
Current consumption at AC 110~240 V, 50/60 Hz in FM Tuner at volume minimum should be ~ 850mA.

4

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
“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.