SONY HCD-GRX20, HCDRXD3 - MINI HI-FI COMPONENT SYSTEM SERVICE MODE, SERVICE ADJUSTMENTS AND SCHEMATIC DIAGRAM

Continuous RMS power output (Reference) 50 W + 50 W (6 Ω at 1 kHz, 10% THD)

HCD-GRX20-RXD3 is the tuner, deck, CD and amplifier section in MHC-GRX20-RXD3.

CD Mechanism Type:  CX3

Base Unit Type:  KSM-213ECM

Optical Pick-up Type:  KSS-213ECM-C2NP

Tape Transport Mechanism Type:  CWL-44-FR

Continuous RMS power output (Reference):  50 W + 50 W (6 Ω at 1 kHz, 10% THD

AM tuner section

Tuning range:   531 – 1,602 kHz (with AM tuning interval set at 9 kHz) 530 – 1,710 kHz (with AM tuning interval set at 10 kHz)

Antenna:   AM loop antenna

Antenna terminals:   External antenna terminal

Intermediate frequency:   450 kHz

TEST MODE

Initialization

STOP + POWER OFF All preset data is re-set to the initial (default) value.

Model display

STOP + DISC 1 Mode name is displayed.

Destination display

STOP + DISC 2 Destination is displayed.

Version display

STOP + DISC 3 Version number of the microprocessor is displayed.

CD aging mode

STOP + DISC SKIP/EX-CHANGE Set discs to DISC 1 and DISC 3. The following operations are repeated when aging starts:

1. DISC 1: TOC Read

2. Plays back the last music of the DISC 1.

3. DISC 3 : TOC Read

4. Plays back the last music of the DISC 3.

5. STOP

6. Tray is open and closed.

TAPE aging mode

STOP + PLAY A Insert a commercially available cassette tape (10 min) to the decks A and B. When aging starts, each tape is rewound and the following operations are repeated:

1. TAPE A: FWD PLAY for one minute

2. TAPE A: FWD STOP for one second

3. TAPE A: FWD PLAY for three minutes

4. TAPE A: FWD FF to tape end

5. TAPE B: FWD PLAY for one minute

6. TAPE B: FWD REC PAUSE for one second

7. TAPE B: FWD REC for three minutes

8. TAPE B: FWD FF to tape end

9. TAPE B: REV PLAY for one minute

10. TAPE B: REV REC PAUSE for one second

11. TAPE B: REV REC for three minutes

12. TAPE B: REV FF to tape end.

CD service mode

STOP + OPEN/CLOSE The message “CD S - -” is displayed on the screen. The sled is moved to the outer circumference while the FF button is pressed. Also, the SLED is moved to the inner circumference while the REW button is pressed. After pressing the PLAY button, FOCUS is turned ON, CLV-S is set, TRACKING and SLED servos are turned OFF and ADDRESS 3 = 3F, 37 is set.

Display

STOP + DBFB All displays are turned ON.

Balance adjustment value

STOP + DISPLAY/DEMO The balance adjustment value is displayed.

Key check

STOP + FILE SELECT Function of the pressed key is displayed.

MECHANICAL ADJUSTMENTS

1. Clean the following parts with a denatured alcohol-moistened swab:

Record-playback head,  pinch rollers, erase head rubber belts, capstan idlers.

2. Demagnetize the record/playback head with a head demagnetizer.

3. Do not use a magnetized screwdriver for the adjustments.

4. After the adjustments, apply suitable locking compound to the parts adjusted.

5. The adjustments should be performed with the rated power supply voltage unless otherwise noted.

Torque Measurement

ELECTRICAL ADJUSTMENTS

DECK SECTION:  0 dB=0.775V

1. Demagnetize the record/playback head with a head demagnetizer.

2. Do not use a magnetized screwdriver for the adjustments.

3. After the adjustments, apply suitable locking compound to the parts adjusted.

4. The adjustments should be performed with the rated power supply voltage unless otherwise noted.

5. The adjustments should be performed in the order given in this service manual. (As a general rule, playback circuit adjustment should be completed before performing recording circuit adjustment.)

6. The adjustments should be performed for both L-CH and RCH.

Record/Playback Head Azimuth Adjustment (Deck A, Deck B)

[Perform these adjustments for both decks.]

AM Tuning Voltage Adjustment

1. Set the reception frequency of the unit to 530 kHz.

2. Adjust L105 for 1.2 ± 0.05 V reading on the DC voltmeter.

3. Set the reception frequency of the unit to 1,710 kHz.

4. Confirm that the voltage reading on the DC voltmeter is within 8.0 ± 0.5 V.

Adjustment Location: MAIN board.

AM Tracking Adjustment.

1. Tune the set to 600 kHz.

2. Set the output of AM RF SSG so that the input level of the set will become 60 dB (µV/m).

3. Adjust L104 so that when the waveform on the oscilloscope is maximum, no noise appears.

4. Tune the set to 1,400 kHz.

5. Adjust TC102 so that when the waveform on the oscilloscope is maximum, no noise appears.

Repeat the procedures in each adjustment several times, and the tracking adjustment should be finally done by the trimmer capacitors.

Adjustment Location: MAIN board.

FM Tuned Level Adjustment

1. Supply a 28 dB 98 MHz signal from the ANTENNA terminal.

2. Tune the set to 98 MHz.

3. Adjust SFR101 to the point (moment) when the TUNED indicator will change from going off to going on.

Adjustment Location: MAIN board

CD SECTION

1. CD Block is basically constructed to operate without adjustment. Therefore, check each item in order given.

2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.

3. Use an oscilloscope with more than 10MΩ impedance.

4. Clean the object lens by an applicator with neutral detergent when the signal level is low than specified value with the following checks.

5. Adjust the focus bias adjustment when optical block is replaced.

1. Connect oscilloscope to test point TP (RF) on CD DECODER board.

2. Turned Power switch on.

3. Put disc (YEDS-18) in and playback.

4. Confirm that oscilloscope waveform is clear and check RF signal level is correct or not.

Note: Clear RF signal waveform means that the shape “◊” can be clearly distinguished at the center of the waveform.

Circuit diagrams

 

PHILIPS MCM166 MICRO SYSTEM SCHEMATIC DIAGRAM – USING ICS TFA9842, ET2314 OR BA5417 AND DISASSEMBLE PROCEDURE

 

Only for MCM166-12-55-05-77

This is previous generation models.

The serial number is: 

Before LM011039227020 (only for-12)

Before LM001039092086 (only for -55-77)

Rated Output Power 2X5W RMS

Speaker Driver 3.5”woofer+0.8” tweeter

Because the material of the lens is synthetic and coated with a special anti-reflectivity layer, cleaning must be done with a non-aggressive cleaning fluid. It is advised to use “Cleaning Solvent.

Before touching the lens it is advised to clean the surface of the lens by blowing clean air over it.  This to avoid that little particles make scratches on the lens.

The actuator is a very precise mechanical component and may not be damaged in order to guarantee its full function.  Clean the lens gently (don’t press too hard) with a soft and clean cotton bud moistened with the special lens cleaner.

Disassembly procedure

SCHEMATIC. Used Amplifier IC: TFA9842

CIRCUIT DIAGRAM - MCU BOARD

SCHEMATIC, Used Amplifier IC: ET2314 or BA5417

Disassembly procedure

Main board circuit diagram.

SONY HCD XGR88 COMPONENT HI-FI STEREO SYSTEM CIRCUIT DIAGRAM

Sony HCD XGR88 COMPONENT Hi-Fi STEREO SYSTEM circuit diagram

HCD-XGR88 is the Amplifier, CD player, tape deck and tuner section in LBT-XGR88.

DIN power output (rated):	145 + 145 watts (6 ohms at 1 kHz, DIN)
Continuous RMS power output (reference):

180 x 2 + 180 x 2 watts (6 ohms at 1 kHz, 10% THD)

Model Name Using Similar Mechanism	HCD-XGR80	CD Section
CD Mechanism Type	CDM37B-30BD60C
Base Unit Name	BU-30BD60C
Optical Pick-up Name	A-MAX.3
TAPE Section	Model Name Using Similar Mechanism	NEW
Tape Mechanism Type	CWM43RR23

                                                                                  Main board 1/4

Main board 2/4

Main board 3/4

Main board 4/4

PA board

FL board

Panel keyboard

Sub-Amp board

JVC UX-G68E, UX-G68EN, UX-G68EV MICRO COMPONENT SYSTEM – EXPLODED VIEW, CIRCUIT DIAGRAM – EXPLODED VIEW AND PRINTED CIRCUIT BOARDS - HOW TO DISASSEMBLE, HOW TO ENTER THE CHECK MODE - SERVICE ADJUSTMENTS

 3D phonic, radio data system, MP3-WMA-WAV-MPEG-3 ASF PLAYBACK – Digital Direct Progressive Scan

Output Power:  120 W (60 W + 60 W) at 6Ω (10% THD

Speaker units: 

Tweeter:  4 cm cone × 1

Woofer: 12 cm cone × 1

Impedance:  6Ω

Disassembly procedure

Main body

 Removing the Metal cover

(See Fig.1 and 2)

(1) Remove the four screws A (both side) attaching the Metal cover. (See Fig.1)

(2) Remove the two screws B attaching the Rear cover. (See Fig.2)

(3) Remove the five screws C attaching the Metal cover. (See Fig.2)

Removing the Front panel assembly

(See Fig.3 to 5)

(1) Disconnect the card wire from the FL board assembly connected to connector CN205 of the Micon board assembly. (See Fig.3)

(2) Remove the two screws D attaching the Front panel assembly. (See Fig.4)

(3) Disengage the hook a (Fig.4) and hook b (Fig.5) from the bottom chassis. (See Fig.4, 5)

Removing the Fan

(See Fig.6, 7)

(1) Disconnect the connector wire from the Fan connected to connector CN602 of the Audio board assembly. (See Fig.6)

(2) Remove the two screws E attaching the Fan. (See Fig.7)

 Removing the Tuner pack

(See Fig.7, 8)

(1) Disconnect the card wire from the Tuner pack connected to connector CN11 of the Micon board assembly. (See Fig.8)

(2) Remove the two screws F attaching the Tuner pack. (See Fig.7)

Removing the Audio board assembly

(See Fig.9 to 11)

(1) Disconnect the connector wire from the Power transformer connected to connector CN601 of the Audio board assembly. (See Fig.9)

(2) Disconnect the card wire from the USB jack board assembly connected to connector CN811 of the Audio board assembly. (See Fig.9)

(3) Disconnect the card wire from the Audio board assembly connected to connector CN203 of the Micon board assembly. (See Fig.9)

(4) Disconnect the card wire from Micon board assembly connected to connector CN217 of the Audio board assembly. (See Fig.9)

(5) Disconnect the card wire from DVD mechanism assembly connected to connector CN722 of the Audio board assembly. (See Fig.9)

(6) Disconnect the card wire from USB jack board assembly connected to connector CN810 of the Audio board assembly. (See Fig.9)

(7) Disconnect the card wire from Micon board assembly connected to connector CN219 and CN220 of the Audio board assembly. (See Fig.9)

(8) Remove the two screws G attaching the Audio board assembly. (See Fig.9)

(9) Remove the two screws H attaching the Power amplifier IC. (See Fig.10)

(10) Remove the three screws J attaching the Amplifier board assembly. (See Fig.11)

Removing the Micon board assembly

(See Fig.12, 13)

(1) Disconnect the connector wire from Power transformer connected to connector CN202 of the Micon board assembly. (See Fig.12)

(2) Disconnect the card wire from Power trans board assembly connected to connector CN201 of the Micon board assembly. (See Fig.12)

(3) Disconnect the card wire from DVD mechanism assembly connected to connector CN21, CN711 and CN831 of the Micon board assembly. (See Fig.12)

(4) Disconnect the card wire from the USB jack board assembly connected to connector CN206 of the Micon board assembly. (See Fig,12)

(5) Remove the two screws K attaching the Micon board assembly. (See Fig.12)

(6) Remove the four screws L attaching the Micon board assembly. (See Fig.13)

Removing the DVD mechanism assembly

(See Fig.14 to 16)

(1) Remove the two screws M (both side) attaching the bracket. (See Fig.14)

(2) Disconnect the connector wire from DVD mechanism assembly connected to connector CN803 of the USB jack board assembly. (See Fig.15)

(3) Remove the one screw N attaching the DVD mechanism assembly. (See Fig.16)

Removing the USB jack board assembly

(See Fig.17)

Remove the one screw P attaching the USB jack board assembly.

Removing the Power transformer board assembly

(See Fig.18 to 20)

(1) Remove the one screw Q attaching the Power trans board assembly. (See Fig.18)

(2) Remove the one screw R attaching the Power trans board assembly. (See Fig.19)

(3) Disconnect the connector wire from Power cord connected to connector CN101 and disconnect the connector wire from Power transformer connected to connector CN102 of

the Power trans board assembly. (See Fig.20)

Removing the FL board assembly

(See Fig.21)

(1) Remove the five screws S attaching the FL board assembly.

3.1.11 Removing the Key board assembly

(See Fig.21)

(1) Remove the Volume knob.

(2) Remove the six screws T attaching the Key board assembly.

(3) Disengage the six hooks c engaged Key board assembly.

DVD mechanism.  Removing the traverse mechanism

(See Fig.1 to 6)

(1) Remove the two screws A attaching the tramecha holder from top side of DVD mechanism assembly. (See Fig.1)

(2) Remove the two screws B attaching the DVD module board. (See Fig.2)

(3) Remove the four screws C attaching the CB holder and take out it. (See Fig.3)

(4) Remove the four screws D attaching the traverse mechanism. (See Fig.4)

(5) Solder the solder part of DVD pick up. (See Fig.5)

(6) Disconnect the card wire from CN101 and CN201 on the DVD module board. (See Fig. 6)

Caution:

• Solder the short land section on the DVD pickup before disconnecting the card wire from the connector on the DVD pickup. If the card wire is disconnected without attaching solders, the pickup may be destroyed by static electricity. • When attaching the DVD pickup, be sure to remove solders from the short land section after connecting the card wire to the connector on the DVD pickup.

Removing the pickup assembly

(See Fig.7 to 11)

(1) Remove the two rod springs pressing the guide shaft. (SeeFig.7)

(2) Remove the screw E and F attaching the spring holder. (See Fig.8)

(3) Remove the read screw from traverse mechanism assembly. (See Fig.9)

Caution:

When remove the lead screw, do not loss the middle gear. (See Fig.10 and 11)

(4) Remove the bar spring pressing the shaft. (See Fig.10)

(5) Take out the pickup assembly from traverse mechanism chassis by order. (See Fig.11)

Removing the feed motor assembly

(See Fig.12)

(1) Remove the one screw G attaching the feed motor assembly.

(2) Remove the feed motor wires from solder part of spindle motor board.

Removing the spindle motor assembly

(See Fig.13)

Remove the two screws H attaching the spindle motor from spindle motor board.

Removing the tray assembly

(See Fig.14 & 15)

(1) Remove the two screws J attaching the clamper base. (See Fig.14)

(2) Remove the one screw K attaching the shaft guide from bottom side. (See Fig.14)

(3) Remove the two screws L attaching the shaft guide from top side. (See Fig.15)

Caution:

When attach the tray assembly, boss of loading sub assembly should attach to guide of bottom side at tray assembly. (See Fig.15)

ADJUSTMENTS

Attention in service of DVD section

(1) When pickup, Flash ROM, DVD module board were changed, initialize EEPROM by all means.

(2) When full initialization was executed, execute learning with a DVD test disk by all means.

Test disc : VT-501, VT-502

Learning method: It is adjusted automatically by normal playback of a DVD test disc.

DVD test mode

TO ENTER DVD TEST MODE, TO EXIT DVD TEST MODE

(1) During TEST MODE (except for Device Key write & DVD Region Re-write), press POWER key.

(2) To exit TEST MODE for Device Key Write & DVD Region Re-write, first AC OFF, then AC ON again to return to normal state.

DVD MODULE EEPROM INITIALIZATION, DEVICE KEY CHECKSUM DISPLAY

DVD CHECK MODES

(1) AC Power OFF.

(2) Press and hold DVD/CD + keys on the front panel. Then AC power ON while holding these keys.

(3) DVD mechanism will start in TEST MODE. The following will be display on the set.

xx = Destination information as follows; JC/1U/D/E/2U/3U/UB/UT/4U/UY/EE/UF

y = region number

v = study state information from MECHA-CON

w = initialization state from MECHA-CON

TO EXIT DVD TEST MODE

(1) During TEST MODE (except for Device Key write & DVD Region Re-write), press POWER key.

(2) To exit TEST MODE for Device Key Write & DVD Region Re-write, first AC OFF, then AC ON again to return to normal state.

DVD MODULE EEPROM INITIALIZATION

DEVICE KEY CHECKSUM DISPLAY

(1) During TEST MODE, press MENU key on remote control to enter DEVICE KEY CHECKSUM display for DVD-AUDIO (CPPM).

(2) System will display as follows.

(3) Press MENU again to enter DEVICE KEY CHECKSUM display for DVD-VR MODE (CPRM).

(4) System will display as follows.

  

JVC UXG68E, UXG68EN, UXG68EV – EXPLODED VIEW, CIRCUIT DIAGRAM – EXPLODED VIEW AND PRINTED CIRCUIT BOARDS 

MICRO COMPONENT SYSTEM – JVC UX-G68E, UX-G68EN, UX-G68EV circuit diagram, block diagram, printed circuit boards and exploded view

Block diagram

Audio section schematic

Microcontroller section schematic

Front panel section schematic

Video control section schematic

DVD section schematic

Printed circuit boards

Exploded view