DOWNLOAD Panasonic SA-MAX370GS / SA-MAX770GS Service Manual ↓ Size: 6.04 MB | Pages: 83 in PDF or view online for FREE

Model
SA-MAX370GS SA-MAX770GS
Pages
83
Size
6.04 MB
Type
PDF
Document
Simplified Service Manual
Brand
Device
Audio / CD STEREO SYSTEM
File
sa-max370gs-sa-max770gs.pdf
Date

Panasonic SA-MAX370GS / SA-MAX770GS Simplified Service Manual ▷ View online

PSG1403018AE
CD Stereo System
Model No.
SA-MAX370GS
SA-MAX770GS
Product Color:  (K)...Black Type 
TABLE OF CONTENTS
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 AC Cord ------------------------------------- 5
1.5. Caution For Fuse Replacement------------------------ 6
1.6. Safety Parts Information  -------------------------------- 6
2 Warning -------------------------------------------------------------- 7
2.1. Prevention of Electrostatic Discharge (ESD)
to Electrostaticy Sensitive (ES) Devices ---------- 7
2.2. Precaution of Laser Diode ------------------------------- 7
2.3. General description about Lead Free Solder
(PbF) ---------------------------------------------------------- 8
2.4. Handling Precautions for Traverse Ass’y ------------ 8
2.5. Grounding for electrostatic breakdown
prevention---------------------------------------------------- 9
Notes: Please use this manual together with service manual 
Model No.[SA-MAX370PUK, SA-MAX770PUK], Order no. (PSG1402009CE).
• Speaker system SB-MAX370GSK, Order No: PSG1404010AE (For SA-MAX370GS)
• Speaker system SB-MAX770GSK, Order No: PSG1403039AE (For SA-MAX770GS)
2
3 Service Navigation---------------------------------------------- 10
3.1. Service Information -------------------------------------- 10
3.2. Notes -------------------------------------------------------- 10
4 Specifications ---------------------------------------------------- 11
5 Block Diagram --------------------------------------------------- 13
5.1. System Control ------------------------------------------- 13
5.2. Audio -------------------------------------------------------- 17
5.3. Power Supply --------------------------------------------- 19
6 Schematic Diagram--------------------------------------------- 21
6.1. Schematic Diagram Notes ----------------------------- 21
6.2. Main (I/O Expansion) Circuit -------------------------- 23
6.3. Main (Fan LED) Circuit --------------------------------- 24
6.4. Main (DSP) Circuit --------------------------------------- 25
6.5. Main (Amp BTL) Circuit (1/2)-------------------------- 26
6.6. Main (Amp BTL) Circuit (1/2)-------------------------- 27
6.7. Main (MICON) Circuit (1/2) ---------------------------- 28
6.8. Main (MICON) Circuit (2/2) ---------------------------- 29
6.9. Main (Amp Single) Circuit (1/2) ----------------------- 30
6.10. Main (Amp Single) Circuit (2/2) ----------------------- 31
6.11. Main (FE) Circuit ----------------------------------------- 32
6.12. Main (Karaoke) Circuit ---------------------------------- 33
6.13. Main (Digital-Power) Circuit (1/2) -------------------- 34
6.14. Main (Digital-Power) Circuit (2/2) -------------------- 35
6.15. Main (USB) Circuit --------------------------------------- 36
6.16. Main (AUX Tuner) Circuit ------------------------------ 37
6.17. Illumination Left, Illumination Right, Button
Right & USB Circuit-------------------------------------- 38
6.18. FL Display Circuit ---------------------------------------- 39
6.19. Volume Jog & Multi Control Circuit ------------------ 40
6.20. Button Left Circuit ---------------------------------------- 41
6.21. Mic, Illumination Jog & CD Interface Circuit ------- 42
6.22. SMPS Circuit (1/2) --------------------------------------- 43
6.23. SMPS Circuit (2/2) --------------------------------------- 44
7 Printed Circuit Board ------------------------------------------ 45
7.1. Main P.C.B. (Side A)------------------------------------- 45
7.2. Main P.C.B. (Side B)------------------------------------- 46
7.3. Illumination Left, Illumination Right & FL
Display P.C.B. --------------------------------------------- 47
7.4. Button Left, Button Right, Mic & USB P.C.B. ------ 48
7.5. Volume Jog, Illumination Jog & Multi Control
P.C.B.-------------------------------------------------------- 49
7.6. SMPS P.C.B. ---------------------------------------------- 50
8 Voltage and Waveform Measurement -------------------- 51
8.1. Voltage Measurement----------------------------------- 51
8.2. Waveform Chart ------------------------------------------ 59
9 Exploded View and Replacement Parts List ----------- 61
9.1. Cabinet Parts Location 1 ------------------------------- 61
9.2. Cabinet Parts Location 2 ------------------------------- 62
9.3. Cabinet Parts Location 3 ------------------------------- 63
9.4. Packaging (SC-MAX370GSK) ------------------------ 64
9.5. Packaging (SC-MAX770GSK) ------------------------ 65
9.6. Mechanical Replacement Part List ------------------ 67
9.7. Electrical Replacement Part List --------------------- 69
3
1 Safety Precautions
1.1.
General Guidelines
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.
1.1.1.
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 chassis, 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
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 1-1.
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
1.2.
Before Repair and Adjustment
Disconnect AC power to discharge AC Capacitors (C1001, C1002, C1003, C1004, C1006, C1518) through a 10 
Ω
, 10 W 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.
Current consumption at AC 220~240 V, 50/60 Hz in FM Tuner at volume minimum should be ~ 850mA.
4
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 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.
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Panasonic SA-MAX370GS / SA-MAX770GS Simplified Service Manual ▷ Download

  • DOWNLOAD Panasonic SA-MAX370GS / SA-MAX770GS Service Manual ↓ Size: 6.04 MB | Pages: 83 in PDF or view online for FREE
  • Here you can View online or download the Simplified Service Manual for the Panasonic SA-MAX370GS / SA-MAX770GS in PDF for free, which will help you to disassemble, recover, fix and repair Panasonic SA-MAX370GS / SA-MAX770GS Audio. Information contained in Panasonic SA-MAX370GS / SA-MAX770GS Simplified Service Manual (repair manual) includes:
  • Disassembly, troubleshooting, maintenance, adjustment, installation and setup instructions.
  • Schematics, Circuit, Wiring and Block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Exploded View and Parts List.