Panasonic SAHT-40-EE Service manual

Specification

nAMPLIFIER SECTION

RMS output power of each channel driven

10% total harmonic distortion

1 kHz front CH

90 W per channel (4 Ω)

1 kHz surround CH

90 W per channel (4 Ω)

1 kHz center CH

220 W per channel (6 Ω)

100 Hz subwoofer CH

220 W per channel (6 Ω)

Total RMS output power 800 W

Rated minimum sine wave RMS power output

1% total harmonic distortion (Dolby Digital mode)

1 kHz front CH

50 W per channel (4 Ω)

1 kHz surround CH

50 W per channel (4 Ω)

1 kHz center CH

150 W per channel (6 Ω)

100 Hz subwoofer CH

150 W per channel (6 Ω)

Total RMS output power 500 W

Total harmonic distortion

Half power at 1 kHz (Front CH) 0.5% (4 Ω)

Input sensitivity

GAME/AUX, TV, DVR/DVD-P 450 mV, IHF’66

MUSIC PORT 250 mV, IHF’66

S/N at rated power (4 ΩΩΩΩ)

GAME/AUX, TV, DVR/DVD-P 80 dB, (85 dB, IHF’66)

ORDER NO. MD0604121C3

Home Theater Audio System

SA-HT40EE

Colour

(S).......................Silver Type

MUSIC PORT

Input impedance

GAME/AUX, TV, DVR/DVD-P, MUSIC PORT

Tone controls

BASS 50 Hz, +10 to -10 dB

TREBLE 20kHz,+10to-10dB

Digital input

OPTICAL

COAXIAL

nFM TUNER SECTION

Frequency range

Sensitivity

S/N 30 dB 1.9 µV/75 Ω

S/N 26 dB 1.8 µV/75 Ω

S/N 20 dB 1.6 µV/75 Ω

IHF usable sensitivity (IHF’58) 2.2 µV/75 Ω

IHF 46 dB stereo quieting sensitivity

Total Harmonic distortion

MONO 0.2%

STEREO

S/N

MONO 60 dB (71 dB, IHF)

STEREO 58 dB (65 dB, IHF)

Frequency response

Image rejection at 98 MHz 40 dB

IF rejection at 98 MHz 70 dB

Stereo separation (1 kHz) 40 dB

70 dB, (85 dB, IHF’66)

47 kΩ

87.50 MHz to 108.00 MHz

22 µV/75 Ω

0.3%

20 Hz to 15 kHz, +1 dB, -2 dB

SA-HT40EE

Antenna terminal 75 Ω (unbalanced)

nAM TUNER SECTION

Frequency range

522 kHz to 1611 kHz (9 kHz steps)

530 kHz to 1620 kHz (10 kHz steps)

Sensitivity 500 µV/m

Selectivity (at 999 kHz) 30 dB

nGENERAL

Power supply

AC 230 to 240 V, 50 Hz

Power consumption

Dimensions (W × H × D)

430 mm x 105 mm x 385 mm

Mass 3.8 kg

Power consumption in standby mode: 1W

nSYSTEM

120 W

System: SC-HT40 (EE)

Main unit: SA-HT40 (EE)

Front speakers: SB-PF41 (GN)

Surround speakers: SB-PS41 (GN)

Center speaker: SB-PC40 (P)

Subwoofer: SB-W 40 (P)

Notes:

1. Specifications are subject to change without notice. Mass and dimensions are approximate.

2. Total harmonic distortion is measured by the digital spectrum analyzer.

* Manufactured under license from Dolby Laboratories. “Dolby”, “Pro Logic” and the double-D symbol are trademarks of Dolby Laboratories.

** Manufactured under license from Digital Theater System. “DTS” and “DTS Digital Surround” are trademarks of Digital Theater System.

CONTENTS

Page Page

1 Safety Precautions 4

1.1. General Guidelines

1.2. Before Repair and Adjustment

1.3. Protection Circuitry

2 Prevention of Electro Static Discharge (ESD) to

Electrostatically Sensitive (ES) Devices

3 Handling the Lead Solder

3.1. About Lead Free Solder (PbF)

4 Accessories

5 Operation Procedures

5.1. Remote Control Operation

5.2. Main Unit Operation

6 New Features

6.1. Music Port

7 Self Diagnosis and Special Mode Setting

7.1. Doctor & Service Mode (Special Mode setting)

7.2. Error Code Table

8 Assembling and Disassembling

8.1. Caution

8.2. Disassembly Flow Chart

8.3. Main Parts Location

8.4. Disassembly of Top Cabinet

8.5. Disassembly of Rear Panel

8.6. Disassembly of Front Panel

8.7. Disassembly of Panel P.C.B., Music Port P.C.B. & Volume

P.C.B.

8.8. Disassembly of Main P.C.B.

8.9. Disassembly of DSP P.C.B.

8.10. Disassembly of AC In P.C.B.

8.11. Disassembly of Power P.C.B.

8.12. Disassembly of Digital Amp P.C.B.

9 Service Position

9.1. Checking the DSP P.C.B. (Side A) & AC In P.C.B.

9.2. Checking the DSP P.C.B. (Side B)

9.3. Checking the Panel P.C.B., Music Port P.C.B. and Volume

P.C.B.

9.4. Checking the Main P.C.B., Power P.C.B. & Digital Amp

P.C.B.

10 Voltage Measurement and Waveform Chart

10.1. Voltage Measurement

10.2. Waveform Chart

11 Wiring Diagrams

12 Block Diagram

13 Schematic Diagram

13.1. Notes of Schematic Diagram

13.2. (A) DSP Circuit

13.3. (B) Main Circuit

13.4. (C) Digital Amp Circuit

13.5. (D) Panel Circuit, (E) Volume Circuit & (F) Music Port

Circuit

13.6. (G) Power Circuit & (H) AC In Circuit

14 Printed Circuit Board Diagram

14.1. (A) DSP P.C.B.

14.2. (B) Main P.C.B.

14.3. (C) Digital Amp P.C.B.

14.4. (D) Panel P.C.B., (E) Volume P.C.B. & (F) Music Port

P.C.B.

14.5. (G) Power P.C.B.

SA-HT40EE

14.6. (H) AC In P.C.B. 57

15 Illustration s of IC's, Transistors & Diodes

16 Terminal Functions of Integrated Circuits

16.1. IC301 (C2CBYY0 00152): Microprocessor

17 Exploded Views

17.1. Cabinet Parts Location

17.2. Packaging

18 Replacement Parts List

SA-HT40EE

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, 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 1MΩ and 5.2Ω. When the exposed metal does not have a return path to the chassis, the reading must be

Fig. 1

1.1.2. Leakage Current Hot Check (See Figure 1.)

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.

1.2. Before Repair and Adjustment

Disconnect AC power, discharge Power Supply Capacitors C707 & C1706 through a 10 Ω, 1W 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 230 V - 240 V, 50Hz in NO SIGNAL mode should be 200 ~ 800 mA.

1.3. Protection Circuitry

The protection circuitry may have operated if either of the following conditions is noticed:

*No sound is heard when the power is supplied.

*Sound stops during a performance.

The functions of this circuitry is to prevent circuitry damage, 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 this unit are used.

If this occurs, follow the procedure outlined below:

1. Press the STANDBY

/ON button, switch to STANDBY mode.

SA-HT40EE

2. Determine the cause of the problem and correct it.

3. Press the STANDBY

Note:

When the protection circuitry functions, the unit will not operate unless the STANDBY and then ON again.

/ON button once again, supply the power.

/ON button is first switched STANDBY

2 Prevention of Electro Static Discharge (ESD) to

Electrostatically Sensitive (ES) Devices

Some semiconductor (solid state) devices can be damaged easily by electricity. Such components commonly are called Electrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field-effect transistors and semiconductor “chip” components. The following techniques should be used to help reduce the inciden ce of component damage caused by electro static discharge (ESD).

1. Immediately before handling any semiconductor component or semiconductor-equiped assembly, drain off any ESD on your body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging ESD wrist strap, which should be removed for potential shock reasons prior to applying power to the unit under test.

2. After removing an electrical assembly equiped with ES devices, place the assembly on a conductive surface such as aluminium foil, to prevent electrostatic charge build up or exposure of the assembly.

3. Use only a grounded-tip soldering iron to solder or unsolder ES devices.

4. Use only an anti-static solder remover device. Some solder removal devices not classified as “anti-static (ESD protected)” can generate electrical charge to damage ES devices.

5. Do not use freon-propelle d chemicals. These can generate electrical charges sufficient to damage ES devices.

6. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it. (Most replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminium foil or comparable conductive material).

7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material to the chassis or circuit assembly into which the device will be installed.

Caution

Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.

8. Minimize body motions when handling unpackaged replacement ES devices. (Otherwise harmless motion such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity (ESD) sufficient to damage an ES device).

3 Handling the Lead Solder

3.1. About Lead Free Solder (PbF)

Distinction of PbF P.C.B. :

P.C.B.s (manufactured) using lead free solder will have a PbF stamp on the P.C.B.

Caution:

· Pb free solder has a higher melting point that standard solder; Typically the melting point is 50 - 70°F (30 - 40°C) higher. Please use a high temperature soldering iron. In case of the soldering iron with temperature control, please set it to 700 ± 20°F (370 ± 10°C).

· Pb free solder will tend to splash when heated too high (about 1100°F/600°C).

· W hen soldering or unsoldering, please completely remove all of the solder on the pins or solder area, and be sure to heat the

soldering points with the Pb free solder until it melts enough.

SA-HT40EE

4 Accessories

Note: Refer to Packing Materials & Accessories (Section 18) for part number.

AC power cord

FM indoor antenna

AM loop antenna

Remote control

5 Operation Procedures

5.1. Remote Control Operation

SA-HT40EE

5.2. Main Unit Operation

SA-HT40EE

6 New Features

6.1. Music Port

7 Self Diagnosis and Special Mode Setting

This unit is equipped with function for checking and inspecting namely : Self-Diagnostic and Test Mode.

7.1. Doctor & Service Mode (Special Mode setting)

Item FL Display Key Operation

Mode Name Description Front Key

Doctor Mode To enter into Doctor Mode

for checking of various items. (For more information, refer to section 7.1.1.)

1. FL will display as below for 3s:

2. Initialization of all settings & the tuner frequency is set as below.

1. Press & hold and button on main unit follow by the

To exit, press the main unit or remote control.

SA-HT40EE

button at the same time.

button on the

Service Mode To enter into Service

Mode for checking of uP software Version and displaying EEPROM checksum.

1. FL will display as below:

2. Next is the micro-processor firmware version no.

3. This is follow by checking of EEPROM:-

Notes:

1. When NO EEPROM, it will display “NO EEPROM”.

2. When there is EEPROM, it will display “SUM****” whereby **** refers to check sum no. (ROM Correction).

For Service mode:

1. Press & hold

the

To check uP software Version:

1. Press

To check EEPROM:

1. Press

To exit, press the main unit or remote control.

button on main unit follow by

button at the same time.

button on main unit.

7.1.1. Inspection & Checking Items

After entering into doctor mode, the main unit can be used for checking of various items using the remote control.

Remote Control Test Mode Function and settings

Selector Sound Mode Other setting Vol/Tone

CH 1 TV STEREO Analog -18dB/0dB CH 2 DVR/DVD-P STEREO Analog -18dB/0dB CH 3 REAR MUSIC

PORT

CH 4 FRONT MUSIC

PORT CH 5 TV STEREO Digital (OPT 1) -48dB/0dB CH 6 DVR/DVD-P STEREO Digital (OPT 2) -48dB/0dB CH 7 TV STEREO Digital (COAX) -48dB/0dB CH 8 If the input selector is TUNER, auto tuning function is started to upward on current frequency. CH 9 If the input selector is TUNER, auto tuning function is started to downward on current frequency. CH 0 If the input selector is TUNER in E2 mode, Display Mode (PS/PTY) is changed.

TUNER STEREO Frequency: FM max

MUTING All indicators of FL are displayed. All LED are off.

Note: After this setting, only ‘POWER’ button by the remote control can be entered. Volume Up Check Main uP software Version.

Display [K 100R ** ]; **is current version.

* Volume is still increased but not displayed. Volume Down Check for EEPROM & Check Sum.

Display [SUM ****]; **** is checksum.

If no ROM correction, and when EEPROM is not attach, display [NO_EEPROM]

* Volume is still reduced but not displayed. SUBW DVR/DVD-P ---------- All CH printed out -18dB/0dB LEVEL No change SURROUND Scan the test noise output channel with

-/L TV STEREO Balance is set to leftmost. -18dB/0dB +/R TV STEREO Balance is set to rightmost -18dB/0dB

STEREO Analog -18dB/0dB

-48dB/0dB

FM Mode: MONO

-18dB/0dB

500ms intervals.

and

button on

SA-HT40EE

7.2. Error Code Table

Self- Diagnosis Function provides information on any problems occuring for the units and its respective parts by display ing error codes.

Error Code Diagnosis Contents Description of error Automatic FL Display Remarks

OVERLOAD Speaker short, power

amplifier failure Digital amplifier abnormal operation

FAN LOCK Detection of FAN

LOCK

F76 Detection of POWER

MALFUNCTION & abnormal operation

F70 Detection of POWER

MALFUNCTION & abnormal operation

Both [SHORT_DET] & [FAN_LOCK] signal is detected as active high while [DC_DET] signal is active low.

Both [SHORT_DET] & [DC_DET] signal is detected as active high while [FAN_LOCK] signal is active low.

Both [FAN_LOCK] & [DC_DET] signal is detected as active high while [SHORT_DET] is active low.

All channels into muting.

* When any button is next press when in this condition.

SA-HT40EE

8 Assembling and Disassembling

8.1. Caution

“Attention Servicer”

Some chassis components may have sharp edges. Be careful when disassembling and servicing.

1. This section describes procedures for checking the operation of the major printed circuit boards and replacing the main components.

2. For reassembly after operation checks or replacement, reverse the respective procedures.

Special reassembly procedures are described only when required.

3. Select items from the following index when checks or replacement are required.

4. Refer to the Parts No. on the page of “Replacement Parts List” (Section 18), if necessary.

Below is the list of disassembly procedures

· Disasse mbly of Top Cabinet

· Disasse mbly of Rear Panel

· Disasse mbly of Front Panel

· Disasse mbly of Panel P.C.B., Music Port P.C.B. & Volume P.C.B.

· Disasse mbly of Main P.C.B.

· Disasse mbly of DSP P.C.B.

· Disasse mbly of AC In P.C.B.

· Disasse mbly of Power P.C.B.

· Disasse mbly of Digital Amp P.C.B.

Caution

Do ensure the correct screw is uses.

8.2. Disassembly Flow Chart

The following chart is the procedure for disassembling the casing and inside parts for internal inspection when carrying out the servicing.

To assemble the unit, reverse the steps shown in the chart as below.

SA-HT40EE

8.3. Main Parts Location

8.4. Disassembly of Top Cabinet

Step 1: Remove 2 screws.

Step 2 : Remove 2 screws at rear panel.

SA-HT40EE

Step 3 : Open and lift up the top cabine t as arrow shown.

8.5. Disassembly of Rear Panel

· Follow the (Step 1) - (Step 3) of item 8.4. - Disassembly of Top Cabinet

Step 1 : Remove 10 screws at rear panel.

Step 2 : Detach wire connector (CN5500) at Digital Amp P.C.B..

Step 3 : Release 2 catches and pull the rear panel backwards as the arrow shown.

SA-HT40EE

8.6. Disassembly of Front Panel

· Follow the (Step 1) - (Step 3) of item 8.4. - Disassembly of Top Cabinet

Step 1 : Detach the wire connections (CN400, CN402 & CN401) at Main P.C.B. and (CN801) at Power P.C.B..

Step 3 : Releas e 2 catches.

Step 4 : Push forward front panel as the arrow shown.

Step 2 : Releas e 3 catches.

8.7. Disassembly of Panel P.C.B., Music Port P.C.B. & Volume P.C.B.

· Follow the (Step 1) - (Step 3) of item 8.4. - Disassembly of Top Cabinet

· Follow the (Step 1) - (Step 4) of item 8.6. - Disassembly of Front Panel

Step 1 : Remove the volume knob as picture shown.

Step 2 : Remove 2 screws grounding wires as picture shown.

Caution:

Remember to screw the 2 grounding wires during assembly.

Step 3 : Remove 4 screws as picture shown.

SA-HT40EE

· Disasse mbly of Panel P.C.B. and Music Port P.C.B.

Step 4 : Remove 9 screws at Panel P.C.B..

Step 5 : Remove 2 screws at Music Port P.C.B..

· Disasse mbly of Volume P.C.B.

Step 6 : Remove 3 screws at Volume P.C.B..

Step 7 : Release 2 clutchs.

8.8. Disassembly of Main P.C.B.

· Follow the (Step 1) - (Step 3) of item 8.4. - Disassembly of Top Cabinet

· Follow the (Step 1) - (Step 3) of item 8.5. - Disassembly of Rear Panel

Step 1 : Remove 5 screws at Main P.C.B..

Step 2 : Disconnect FFC cables (CN400, CN402, CN401, CN800A, CN802A, CN904A, CN200A and CN403A) at Main P.C.B. .

Step 3 : Disconnect 2 connectors (CN906 & CN405) at DSP P.C.B..

Step 4 : Lift up and remove the Main P.C.B. as picture shown.

SA-HT40EE

8.9. Disassembly of DSP P.C.B.

· Follow the (Step 1) - (Step 3) of item 8.4. - Disassembly of Top Cabinet

Step 1 : Remove 3 screws at rear panel.

Step 2 : Remove 2 screws at DSP P.C.B..

Step 3 : Disconnect 4 connectors (CN906, CN904B, CN405 &CN403B) at DSP P.C.B..

Step 4 : Lift up and remove the DSP P.C.B. as the arrow shown.

8.10. Disassembly of AC In P.C.B.

· Follow the (Step 1) - (Step 3) of item 8.4. - Disassembly of Top Cabinet

Step 1 : Remove 1 screw at rear panel.

Step 2 : Remove 1 screw at AC In P.C.B..

Caution:

Remember to use tie wraps to tie red/ white wires between (AC In P.C.B. and Power P.C.B.) to the side of AC In P.C.B. after repair or troubleshooting.

SA-HT40EE

Step 3 : Lift up and place AC In P.C.B. as picture shown.

Note:

Caution when lift up the AC In P.C.B..

8.11. Disassembly of Power P.C.B.

· Follow the (Step 1) - (Step 3) of item 8.4. - Disassembly of Top Cabinet

· Follow the (Step 1) - (Step 3) of item 8.10. - Disassembly of AC In P.C.B.

Step 1 : Remove 5 screws at Power P.C.B..

Step 2 : Disconnect 2 connectors (CN800A & CN802A) at Main P.C.B..

Step 3 : Disconnect 1 connector (CN801) at Power P.C.B..

Step 4 : Disconnect 1 connector (CN850) at Digital Amp P.C.B..

Step 5 : Lift up the Power P.C.B. as picture shown.

SA-HT40EE

· Replacement of the Power Supply IC and Diode

Step 6 : Remove 1 screw (from IC701).

Step 7 : Remove 3 screws (from IC800, D855 and D856).

Step 8 : Flip over the Power P.C.B..

Step 9 : Desold er the terminal to replace the components.

8.12. Disassembly of Digital Amp P.C.B.

· Follow the (Step 1) - (Step 3) of item 8.4. - Disassembly of Top Cabinet

· Follow the (Step 1) - (Step 3) of item 8.10. - Disassembly of AC In P.C.B.

Step 1 : Remove 3 screws at rear panel.

Step 2 : Detach FFC cables (CN5500, CN200B & CN850) at Digital Amp P.C.B..

Step 3 : Remove 5 screws at Digital Amp P.C.B..

Step 4 : Lift up and remove the Digital Amp P.C.B. as arrow shown.

SA-HT40EE

· Replacement of the Power Amp IC

Step 5 : Remove 4 screws at the IC Clamp.

Step 6 : Flip over Digital Amp P.C.B..

Step 7 : Desold er the terminal to replace the components.

SA-HT40EE

9 Service Position

Note:

Checking of all Major P.C.B. (Main P.C.B., DSP P.C.B., AC In P.C.B., Digital Amp P.C.B., Power P.C.B., Panel P.C.B., Music Port P.C.B. & Volume P.C.B.) can be carried out using below procedures.

For the disassembling procedure, see Section 8.

9.1. Checking the DSP P.C.B. (Side A) & AC In P.C.B.

9.2. Checking the DSP P.C.B. (Side B)

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