Panasonic RXES-23 Service manual

Portable Stereo CD System

RX-ES23GC RX-ES23GS RX-ES23GN RX-ES23GT

Colour

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

Order No. MD0502018C3

Specification

n RADIO

Frequency range

FM 87.50-108.00 MHz (50 kHz steps)

M 522-1629 kHz (9 kHz steps)

520-1630 kHz (10 kHz steps)

n CD PLAYER

Sampling frequency 44.1 kHz

Decoding 16 bit linear

Beam source Semiconductor laser (wavelength

780 nm)

No. of channels 2 channel, stereo

Wow and flutter Below measurable limit

D/A converter MASH (1 bit DAC)

n TAPE RECORDER

Track system Stereo

Monitor system Variable sound monitor

Recording system AC bias

Erasing system Multi Pole magnet

Frequency range

Normal position 50-14000 Hz

n GENERAL

Speakers 8cm2.7Ω x2

Jacks

Output Phones: 3.5 mm stereo (16-32Ω)

Power requirement (For GC / GS)

C 110-127 V / 220-240 V, 50 / 60 Hz

Power consumption 20 W

Power requirement (For GN)

C 230-240 V, 50 Hz

Power consumption 23 W

Power requirement (For GT)

C 110V,60Hz

Power consumption 26 W

Battery 12 V [Eight R20/LR20 (D, UM-1)

batteries]

l Do not use rechargeable type batteries

Memory backup for computer/clock

l Do not use rechargeable type batteries

Dimensions 529 mm (W ) x 144 mm (H) x 276

Mass (For GC / GS / GN) 3.9 kg without batteries

Mass (For GT) 3.6 kg without batteries

Power consumption in standby mode (For GC / GS)

Power consumption in standby mode (For GN / GT)

6 V [Four R6/LR6 (AA, UM-3)

batteries]

mm (D)

3.0 W (117 V)

3.5 W (240 V)

2.3 W

RX-ES23 GC / RX-E S23GS / RX-ES23G N / RX- ES23GT

Notes:

1. Specifications are subject to change without notice.

2. Mass and dimensions are approximate

CONTENTS

Page Page

1 Safety Precautions

1.1. GENERAL GUIDELINES

2 Caution for AC Mains Lead

3 Before Use

4 Before Repair and Adjustment

5 Protection Circuitry

6 Handling the Lead Solder

6.1. About lead free solder (PbF)

7 Precaution of Laser Diode

8 Handling Precautions For Traverse Deck

9 Accessories

10 Operation Procedures

10.1. Main unit

10.2. Remote control

11 Information on MP3

12 Disassembly and Main Component Replacement Procedures

and Operational Check

12.1. Disassembly flow chart

12.2. Checking Procedure for each major P.C.B.

12.3. Procedures for Replacing Pinch Roller and Head Block

(Deck Mechanism Unit)

12.4. Procedures for Replacing Motor, Capstan Belt A, Capstan

Belt B, and Winding Belt (Deck Mechanism Unit)

12.5. Procedures for Replacing Parts on Deck Mechanism PCB

12.6. Procedures of Replacing Traverse Base (Unit), Driving

Gear, and Cam Gear (CD Mechanism Unit)

12.7. Procedures for Replacing Optical Pickup (CD Mechanism

Unit)

12.8. Procedures for Replacement Traverse Gear A and

Traverse Gear B (CD Mechanism Unit)

13 Procedure for checking of the major P.C.B.

13.1. Checking the Main P.C.B., Panel P.C.B., Deck Mechanism

P.C.B., CD Servo P.C.B., Battery P.C.B., Sensor P.C.B.,

Power and Standby LED P.C.B.

14 Self Diagnostic Function

14.1. Self-Diagnosis Function

14.2. Setting of doctor mode

15 Measurements and Adjustments

15.1. Tuner Section

15.2. Deck Section

16 Voltage Measurement

16.1. Main P.C.B.

16.2. CD Servo P.C.B.

17 Waveform Chart

18 Notes of Schematic Diagram

19 Schematic Diagram

19.1. CD SERVO CIRCUIT

19.2. MAIN CIRCUIT

19.3. MAIN (TUNER) CIRCUIT

19.4. MAIN (DECK) CIRCUIT and DECK MECHANISM

CIRCUIT

19.5. PANEL CIRCUIT, STANDBY LED CIRCUIT, BATTERY

CIRCUIT, SENSOR CIRCUIT and POWER CIRCUIT

20 Printed Circuit Board

20.1. CD SERVO P.C.B.

20.2. MAIN P.C.B.

20.3. PANEL P.C.B. and DECK MECHANISM P.C.B.

20.4. STANDBY LED P.C.B., BATTERY P.C.B. and SENSOR

P.C.B.

20.5. POWER P.C.B.

21 Wiring Connection Diagram 22 Type Illustration of IC 痴, Transistors and Diodes 23 Terminal Function Of IC 痴

23.1. IC801 (MN101C74GAA1): Microprocessor

24 Troubleshooting Flowchart (CD Section Circuit)

25 Parts Location and Replacement Parts List

25.1. Deck Mechanism (RAA4401-1V)

25.2. CD Loading Mechanism

25.3. Cabinet Part List

25.4. Electrical Part List

25.5. Packaging Materials & Accessories Parts List

25.6. Packaging

RX-ES23 GC / RX-E S23GS / RX-ES23G N / RX- ES23GT

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, ensure that all the protective devices such as insulation barriers, insulation papers shields are properly installed.

3. After servicing, check for leakage current checks to prevent 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. Using an ohmmeter measure the resistance value, 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 measuremen ts.

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. Should the measuremen t is outside of the limits specified, there is a possibility of a shock hazard, and the equipment should be repaired and re-checked before it is returned to the customer.

RX-ES23 GC / RX-E S23GS / RX-ES23G N / RX- ES23GT

2 Caution for AC Mains Lead

RX-ES23 GC / RX-E S23GS / RX-ES23G N / RX- ES23GT

3 Before Use

Be sure to disconnect the mains cord before adjusting the voltage selector. Use a minus (-) screwdriver to set the voltage selector (on the rear panel) to the voltage setting for the area in which the unit will be used.

(If the power supply in your area is 117V or 120V, set to the “127V” position.)

Note that this unit will be seriously damaged if this setting is not made correctly. (There is no voltage selector for some countries; the correct voltage is already set.)

4 Before Repair and Adjustment

Disconnect AC power, discharge Power Supply Capacitors C301, C119, C219, C131, C231, C310, C307, C309 and C331 through a10Ω, 1 W resistor to ground. DO NOT SHORT-CIRCUIT DIRECTLY (with a screw driver blade, for instance), as this may destroy solid state devices.

After repairs are completed, restore power gradually using a variac, to avoid overcurrent.

(For GN) Current consumption at AC 230 - 240 V, 50 Hz in NO SIGNAL mode should be ~180 mA respectively.

(For GC/GS) Current consumption at AC 110 - 127 V / 220 - 240 V, 50/60 Hz in NO SIGNAL mode should be ~200 mA, 180mA respectively.

(For GT) Current consumption at AC 110 V, 60 Hz in NO SIGNAL mode should be ~180 mA respectively.

5 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.

· 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.

6 Handling the Lead Solder

6.1. About lead free solder (PbF)

Distinction of PbF P.C.B. :

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

Caution:

· Pb free solder has a higher melting point than 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.

RX-ES23 GC / RX-E S23GS / RX-ES23G N / RX- ES23GT

7 Precaution of Laser Diode

CAUTION:

This unit utilizes a class 1 laser.

Invisible laser radiation is emitted from the optical pickup lens.

When the unit is turned on:

1. Do not look directly into the pick up lens.

2. Do not use optical instruments to look at the pick up lens.

3. Do not adjust the preset variable resistor on the pickup lens.

4. Do not disassemble the optical pick up unit.

5. If the optical pick up is replaced, use the manufacturer’s specified replacement pick up only.

6. Use of control or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure.

CAUTION!

THIS PRODUCT UTILIZES A LASER. USE OF CONTROLS OR ADJUSTMENTS OR PERFORMANCE OF PROCEDURES OTHER THAN THOSE SPECIFIED HEREIN MAY RESULT IN HAZARDOUS RADIATION EXPOSURE.

8 Handling Precautions For Traverse Deck

The laser diode in the traverse deck (optical pickup) may break down due to potential difference caused by static electricity of clothes or human body.

So, be careful of electrostatic breakdown during repair of the traverse deck (optical pickup).

l Handling of CD traverse deck (optical pickup)

1. Do not subject the traverse deck (optical pickup) to static electricity as it is extremely sensitive to electrical shock.

2. The short land between the No.4 (LD) and No.5 (GND) pins on the flexible board (FFC) is shorted with a solder build-up to prevent damage to the laser diode.

3. Take care not to apply excessive stress to the flexible board (FFC board) (Fig 6.1).

4. Do not turn the variable resistor (laser power adjustment). It has already been adjusted.

RX-ES23 GC / RX-E S23GS / RX-ES23G N / RX- ES23GT

Fig 6.1

l Grounding for electrostatic breakdown prevention

1. Human body grounding (Fig 6.2)

Use the anti-static wrist strap to discharge the static electricity from your body.

2. Work table grounding (Fig 6.2)

Put a conductive material (sheet) or steel sheet on the area where the traverse deck (optical pickup) is placed, and ground the sheet.

Caution :

The static electricity of your clothes will not be grounded through the wrist strap. So, take care not to let your clothes touch the traverse deck (optical pickup).

Fig 6.2

Caution when Replacing the Optical Pickup :

The traverse has a short point shorted with solder to protect the laser diode against electrostatics breakdown. Be sure to remove the solder from the short point before making connections.

RX-ES23 GC / RX-E S23GS / RX-ES23G N / RX- ES23GT

9 Accessories

Note : Refer to Packing Materials & Accessories Parts List (Section 25.5) for the part number.

Remote Control.....1pc

AC cord.....1 pc (For

GN)

AC cord.....1 pc (For

GC)

AC cord.....1 pc (For

GS)

AC cord.....1 pc (For

GT)

AC cord

adaptor.....1

pc (For GC)

10 Operation Procedures

10.1. Main unit

RX-ES23 GC / RX-E S23GS / RX-ES23G N / RX- ES23GT

10.2. Remote control

11 Information on MP3

RX-ES23 GC / RX-E S23GS / RX-ES23G N / RX- ES23GT

12 Disassembly and Main Component Replacement

Procedures and Operational Check

“ATTENTION SERVICER”

Some chassis components may be have sharp edges. Be careful when disassembly 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.

Warning:

This product uses a laser diode. Refer to “Precaution of Laser Diode”.

12.1. Disassembly flow chart

The following chart is the procedure for disassemblin g the unit and inside parts for internal inspection when carrying out the servicing.

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

12.2. Checking Procedure for each major P.C.B.

12.2.1. Disassembly of Top Cabinet Unit.

Step 3: Flip up the handle as arrow direction shown.

RX-ES23 GC / RX-E S23GS / RX-ES23G N / RX- ES23GT

Step 1: Remove 10 screws.

Step 2: Remove 2 screws.

Step 4: Use a screw driver and insert into the hole. Slide the

screw driver to the direction shown to open the cassette panel.

Note: Be careful not to exert strong force as it may cause damage to the chassis.

RX-ES23 GC / RX-E S23GS / RX-ES23G N / RX- ES23GT

Step 5: Cassette panel will automatically open.

Step 8: Flip the Top Cabinet over as arrow shown.

Step 9: Detach the FFC wire (CP401).

Step 6: Remove 2 screws.

12.2.2. Disassembly of Panel P.C.B.

Follow (step 1) to (step 9) of item 12.2.1.

Step 7: Lift up the Top Cabinet as arrow shown.

Step 1: Lift the upper section of the front panel slightly towards

you as arrow shown.

Step 2: While lifting, push the lower section of the front panel in the direction shown by the arrow to release the catches.

Step 3: Remove the Front Panel from Top Cabinet as arrow shown.

RX-ES23 GC / RX-E S23GS / RX-ES23G N / RX- ES23GT

Step 5: Release 2 catches.

Step 6: Flip over the Control Button Unit with the Panel P.C.B.

as arrow shown.

Step 4: Remove 6 screws.

Step 7: Remove the Jog Knob using a screwdriver as arrow

shown.

Caution: Do not exert strong force as it may cause damage to the top cabinet.

RX-ES23 GC / RX-E S23GS / RX-ES23G N / RX- ES23GT

Step 8: Release 6 catches.

12.2.3. Disassembly of Speakers.

Follow (step 1) to (step 9) of item 12.2.1.

Follow (step 1) to (step 10) of item 12.2.2.

Step 9: Remove the Panel P.C.B. as arrow shown.

Step 1: Remove 8 screws.

Step 2: Flip the both side speakers as arrow shown.

Step 3: Desolder the wire at speaker terminal to remove

speaker.

Step 10: Flip the Panel P.C.B. over.

12.2.4. Disassembly of Deck Mechanism.

Follow (step 1) to (step 9) of item 12.2.1.

RX-ES23 GC / RX-E S23GS / RX-ES23G N / RX- ES23GT

Step 1: Remove 4 screws.

Step 3: Release the connector (CP1450) to remove the Deck

Mechanism.

12.2.5. Disassembly of Main, Standby LED and Sensor P.C.B.

Follow (step 1) to (step 9) of item 12.2.1.

Follow (step 1) to (step 3) of item 12.2.4.

Note: Be careful of connectors (CP1301 & CP1902) while removing the deck mechanism.

Step 2: Lift the deck mechanism as arrow shown.

Step 1: Remove 2 screws.

Step 2: Release 4 clutches.

Step 3: Remove the mecha chassis.

RX-ES23 GC / RX-E S23GS / RX-ES23G N / RX- ES23GT

Step 4: Remove 2 screws.

Step 5: Release all the connectors (CP501, CP402 & CP801).

Step 6: Release 1 Catch and remove Standby Led P.C.B..

Step 7: Release the Sensor P.C.B. as arrow shown.

Step 8: Remove the Main P.C.B. as arrow shown.

12.2.6. Disassemb ly of Battery and Power P.C.B.

Follow (step 1) to (step 9) of item 12.2.1.

Follow (step 1) to (step 3) of item 12.2.4.

Follow (step 1) to (step 8) of item 12.2.5.

Step 1: Remove 1 screw.

Step 2: Remove the Battery Support P.C.B..

Note: Remember to place the Battery Support P.C.B. to

original location.

Step 3: Remove the Battery P.C.B. as arrow shown.

RX-ES23 GC / RX-E S23GS / RX-ES23G N / RX- ES23GT

Step 5: Remove the transformer together with Battery P.C.B.

and Power P.C.B. as arrow shown.

Step 4: Remove 3 screws.

12.2.7. Disassembly of CD Loading Mechanism.

Follow (step 1) to (step 9) of item 12.2.1.

Follow (step 1) to (step 3) of item 12.2.4.

Follow (step 1) to (step 8) of item 12.2.5.

Step 1: Remove 4 screws.

RX-ES23 GC / RX-E S23GS / RX-ES23G N / RX- ES23GT

Step 2: Remove the CD loading mechanism as arrow shown.

Step 1: Remove the cassette open spring.

12.2.8. Replaceme nt of Cassette Panel.

Follow (step 1) to (step 9) of item 12.2.1.

Step 2: Push the cassette panel slowly to the right.

RX-ES23 GC / RX-E S23GS / RX-ES23G N / RX- ES23GT

Step 3: Push the cassette panel slowly to the left using a screw

driver.

Caution: Be careful of using/exertin g strong forces.

Step 4: Remove the cassette panel from top cabinet as arrow

shown.

12.3. Procedures for Replacing Pinch Roller and Head Block (Deck Mechanism Unit)

12.4. Procedures for Replacing Motor, Capstan Belt A, Capstan Belt B, and Winding Belt (Deck Mechanism Unit)

Follow (step 1) to (step 9) of item 12.2.1.

Follow (step 1) to (step 3) of item 12.2.4.

Follow (step 1) to (step 9) of item 12.2.1.

Follow (step 1) to (step 3) of item 12.2.4.

RX-ES23 GC / RX-E S23GS / RX-ES23G N / RX- ES23GT

Follow (step 1) to (step 3) of item 12.2.4.

12.6. Procedures of Replacing Traverse Base (Unit), Driving Gear, and Cam Gear (CD Mechanism Unit)

12.6.1. Disassembly of the Disc Tray.

Follow (step 1) to (step 9) of item 12.2.1.

Follow (step 1) to (step 3) of item 12.2.4.

Follow (step 1) to (step 8) of item 12.2.5.

Follow (step 1) to (step 2) of item 12.2.7.

12.5. Procedures for Replacing Parts on Deck Mechanism PCB

Follow (step 1) to (step 9) of item 12.2.1.

RX-ES23 GC / RX-E S23GS / RX-ES23G N / RX- ES23GT

12.7. Procedures for Replacing Optical Pickup (CD Mechanism Unit)

Follow (step 1) to (step 9) of item 12.2.1.

Follow (step 1) to (step 3) of item 12.2.4.

Follow (step 1) to (step 8) of item 12.2.5.

Follow (step 1) to (step 2) of item 12.2.7.

Follow (step 1) to (step 4) of item 12.6.1.

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