Sony HCD-DX375 SUPER AUDIO CD-DVD RECEIVER (US Model)-Test mode, take out the disc at emergency, self diagnosis, adjustment details, power and amplifier board schematic

 

HCD-DX375 is the amplifier, DVD/CD and tuner section in DAV-DX375.

Model Name Using Similar Mechanism:  HCD-DX255

Mechanism Type:  CDM81C-DVBU101

Optical Pick-up Name:  KHM-310CAB

AUDIO POWER SPECIFICATIONS
POWER OUTPUT AND TOTAL HARMONIC DISTORTION
(FTC Output Power): FL/FR/SL/SR/C: 84 W/ch 3 ohm at 170 - 20,000 Hz, 0.7 % THD
SW: 160 W 1.5 ohm at 40 - 170 Hz, 0.7 % THD

Amplifier section
Surround mode (reference) RMS output power, 10 % THD
Front: 143 W + 143 W (with SS-TS52)
Centre*: 143 W (with SS-CT51)
Surround*: 143 W + 143 W (with SS-TS51)
Subwoofer*: 285 W (with SS-WS52B)

LASER DIODE EMISSION CHECK

The laser beam on this model is concentrated so as to be focused on the disc reflective surface by the objective lens in the optical pickup block. Therefore, when checking the laser diode emission, observe from more than 30 cm away from the objective lens

LASER DIODE AND FOCUS SEARCH
1. Open the cover and turn POWER on with no disc inserted.
2. Confirm that the following operation is performed while observing the objecting lens.
1) Confirm that laser beam is spread.
2) Up and down motion of the objective lens. (3 times)

DISC TRAY LOCK
The disc tray lock function for the antitheft of an demonstration disc in the store is equipped.

Press the POWER button to turn the set on.
2. Press the [FUNCTION] button to set DVD function.
3. Insert a disc.
4. Press the STOP button and the EJECT button simultaneously for five seconds.
5. The message “LOCKED” is displayed and the tray is locked.

Releasing Procedure:
1. Press the STOP button and the EJECT button simultaneously for five seconds again.
2. The message “UNLOCKED” is displayed and the tray is unlocked.
Note 1: When “LOCKED” is displayed, the tray lock is not released by turning power on/off with the POWER button.
Note 2: Incorrect operations may be performed if the test mode is not entered properly.
In this case, press the POWER button to turn the power off, and retry to enter the test mode.
Note 3: If the disc tray does not open and the message “LOCKED” appears, press the STOP button and the EJECT button simultaneously for seconds or longer.
Then remove your fingers from the above stick and the button.
The message “UNLOCKED” appears for 2 seconds and the disc tray opens.

DMB12 board replacement
New part of EEP ROM (IC103, IC706) on the DMB12 board cannot be used. Therefore, if the mounted DMB12 board (A-1148-813-A) is replaced, exchange new EEP ROM (IC103, IC706) with that used before the replacement.

Self-diagnosis Function

(When letters/numbers appear in the display)

When the self-diagnosis function is activated to prevent the system from malfunctioning, a 5- character service number (e.g., C 13 50) with a combination of a letter and 4 digits appears on the screen and the front panel display. In this case, check the following table.

First 3 characters of the service number.     Cause and/or corrective action
C 13 The disc is dirty.                           ,               Clean the disc with a soft cloth
C 31 The disc is not inserted correctly.  ,          Restart the system, then re-insert the disc correctly.
E XX (xx is a number)  To prevent a malfunction, the system has performed the self-diagnosis function.  Contact your nearest Sony dealer or local authorized Sony service facility and give the 5- character service number.
Example: E 61

When displaying the version number on the screen.
When you turn on the system, the version number [VER.X.XX] (X is a number) may appear on the screen. Although this is not a malfunction and for Sony service use only, normal system operation will not be possible. Turn off the system, and then turn on the system again to operate.

HOW TO OPEN THE DISC TABLE WHEN POWER SWITCH TURNS OFF. (During a power failure or at emergency)

Discharge the charged electricity in capacitors to prevent electric shock as follows

When disassembling the machine, be sure to discharge the charged electricity in the following capacitors. Use a resistor of 800 ohms, 2 Watts for discharging the following capacitors.

PRECAUTION WHEN INSTALLING A NEW OP UNIT / PRECAUTION BEFORE UNSOLDERING THE STATIC ELECTRICITY PREVENTION SOLDER BRIDGE

When installing a new OP unit, be sure to connect the flexible printed circuit board first of all before removing the static electricity prevention solder bridge by unsoldering. Remove the static electricity prevention solder bridge by unsoldering after the flexible printed circuit board has already been connected.  (Do not remove nor unsolder the solder bridge as long as the OP unit is kept standalone.)

Test mode

Regarding the notification symbol “R”
Because the number of the operating buttons of this product are limited, some operations require use of the operating buttons of the remote commander, When a specific operation requires use of the operating buttons of the remote commander, “R” is added to the specific operating procedure in this manual. Example MENU/NO “R” The MENU/NO button of remote commander.  Incorrect operations may be performed if the test mode is not entered properly.  In this case, press the POWER1 button to turn the power off, and
retry to enter the test mode.

Cold Reset
The cold reset clears all data including preset data stored in the RAM to initial conditions. Execute this mode when returning the set to the customers.
Procedure:
1. Press the POWER button to turn the power on.
2. Press three buttons STOP, EJECT and POWER simultaneously.
3. When this button is operated, display as “COLD RESET” for
a while and all of the settings are reset.

Panel Test Mode
This mode is used to check the software version, FL, LED and KEY

Display Test Mode
Procedure:
1. Press the PWER button to turn the power on.
2. Press three buttons PAUSE , FAST REWIND and EJECT simultaneously.
3. When the display test mode is activated, all segments and LEDs
are turned on.
4. To exit from this mode, press three buttons PAUSE , FAST REWIND and EJECT simultaneously.

Version Test Mode
Procedure:
1. When the panel test mode is activated, press the FAST REWIND button and the message “DCX3FD” is displayed, the version test mode is activated.
2. Whenever press the FAST REWIND button, the version is displayed in order of NA, MC, SYS, UI, DVD, CDMA, CDMB, ST, TA, DSP and TM.
3. Press the FAST FORWARD button and the date of the software production is displayed.
4. Press the FAST FORWARD button again and the version is displayed.
5. To exit from this mode, press three buttons PAUSE , FAST REWIND and EJECT simultaneously.

Key Test Mode
Procedure:
1. When the panel test mode is activated, press the PLAY button, to select the key test mode.
2. To enter the KEY test mode, the fluorescent indicator displays “K0 V0”. Each time a button is pressed, “KEY” value increases. However, once a button is pressed, it is no longer taken into account. When all keys are pressed correctly, “K13 V0” is displayed.
3. When the VOLUME control is turned in the direction of (+), “V0” is changed to “V1”, then ... “V9”.
When the VOLUME control is turned in the direction of (–), “V0” is changed to “V9”, then ... “V1”.
4. To exit from this mode, press three buttons PAUDE , FAST REWIND and EJECT simultaneously.

Disc Tray Lock
The disc tray lock function for the antitheft of an demonstration disc in the store is equipped.
Setting Procedure :
1. Press the POWER button to turn the set on.
2. Press the FUNCTION button to set DVD function.
3. Insert a disc.
4. Press the STOP button and the EJECT button simultaneously for five seconds.
5. The message “LOCKED” is displayed and the tray is locked.
Releasing Procedure :
1. Press the STOP button and the EJECT button simultaneously for five seconds. again.
2. The message “UNLOCKED” is displayed and the tray is unlocked.
Note: When “LOCKED” is displayed, the slot lock is not released by turning power on/off with the POWER button.

DVD Ship Mode
Use this mode when returning the set to the customer after repair.
Procedure:
1. Press the POWER button to turn the set on.
2. Press the FUNCTION button to set the function “DVD”.
3. Remove all discs, press two buttons STOP , and FAST REWIND simultaneously.
4. After a message “MECHA LOCK” is displayed on the fluorescent indicator tube, pull out the AC plug.
5. To exit from this mode, press the POWER button to turn the set on.

AM Step Change
A step of AM channels can be changed over between 9 kHz and 10 kHz.
Procedure:
1. Press the POWER button to turn the set ON.
2. Select the function “TUNER”, and press FUNCTION button to select the BAND “AM”.
3. Press the POWER button to turn the set OFF.
4. Press two buttons FAST FORWARD and POWER simultaneously, and the display of fluorescent indicator tube changes to “AM 9 k STEP” or “AM 10 k STEP”, and thus the channel step is changed over.

Volume Test Mode
Procedure:
1. Press the POWER button to turn the power on.
2. Press three buttons FAST REWIND,  PLAY and FAST FORWARD simultaneously.
3. The message “VOLUME MAX” is displayed, when the
VOLUME control is turned in the direction of (+).
The message “VOLUME MIN” is displayed, when the VOLUME control is turned in the direction of (–).
4. To exit from this mode, press the POWER button to turn the set off.

Product out
This mode moves the optical pick-up to the position durable to vibration and clears all data including preset data stored in the RAM to initial conditions. Use this mode when returning the set to the customer after repair.

Press the POWER button to turn the power on.
2. Press the FUNCTION button to set the function “DVD”.
3. Remove all discs, and then press three buttons FAST FORWARD , EJECT and POWER simultaneously.
4. After the “STANDBY” blinking display finishes, the message “MECHA LOCK” is displayed on the fluorescent indicator tube disconnect the AC power plug, then the ship mode is set.

TEST DISC LIST
Be sure to use the DVD disc that matches the signal standards of your region.
• CD YEDS-18 (Part No.: 3-702-101-01) PATD-012 (Part No.: 4-225-203-01)
• DVD SL (Single Layer): NTSC : HLX-503 (Part No.: J-6090-069-A).  HLX-504 (Part No.: J-6090-088-A),  PAL : HLX-506 (Part No.: J-6090-077-A)
• DVD DL (Dual Layer): NTSC : HLX-501 (Part No.: J-6090-071-A).  HLX-505 (Part No.: J-6090-089-A).  PAL : HLX-507 (Part No.: J-6090-078-A)

GENERAL DESCRIPTION

The Mirror Time and IOP measurement allows you to make diagnosis and adjustment simply by using the remote commander and monitor TV. The instructions, diagnosis results, etc. are given on the on-screen display (OSD).
Be sure to execute the Mirror Time and IOP measurement when a BU (Base Unit) is replaced.

HOW TO ENTER TEST MODE
While pressing the STOP and EJECT buttons simultaneously, turn VOLUME + with the DVD player in power on.
The Test Mode starts, then the menu shown below will be displayed on the TV screen.

The menu above is the Remocon Diagnosis Menu screen which consists of six main function. At the bottom of the menu screen, the model name and IF-con version. To enter Mirror Time Adjustment menu, press button 2 “R” on the remote commander to enter Drive Manual Operation menu. To exit from the Test Mode, press the power button on the remote commander.

DRIVE MANUAL OPERATION
The Drive Manual Operation menu consists of five main functions.
By pressing 2 “R” button on the remote commander in the Remocon Diagnosis Menu, the screen will appear as below.

MIRROR TIME ADJUSTMENT
To enter Mirror Time Adjustment, press 5 “R” button on the remote commander. The screen will appear as below.  There are five main commands in the Mirror time Adjust menu.

CD MIRR time Check
This command checks the Mirror time value for CD disc.
2. DVD MIRR time Check
This command checks the Mirror time value for DVD disc.
3. Threshold
This command displays the threshold value between CD and DVD mirror time.
4. Save to EEPROM
This command saves an adjusted mirror time value to the EEPROM.
5. Default set MIRR time
This command will set CD and DVD mirror time to firmware default value.

 [Open] / [Close]
Pressing the EJECT button controls the tray for disc change during mirror time adjustment.
[0] Return to previous menu
Press the 0 “R” button to return to previous menu.

EXECUTING MIRROR TIME ADJUSTMENT
In order to execute mirror time adjustment, the following standard procedures must be followed.
(1) In power on, while pressing the STOP and EJECT buttons simultaneously, turn VOLUME + .
(2) Select “2. Drive Manual Operation”

POWER BOARD PWB AND SCHEMATIC

POWER AMPLIFIER SCHEMATIC

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Always respect voltages. While some may not be dangerous in themselves, they can cause unexpected reactions that are best avoided. Before reaching into a powered TV set, it is best to test the high voltage insulation. It is easy to do, and is a good service precaution.  It makes sense to avoid exposure to electrical shock.  While some sources are expected to have a possible dangerous impact, others of quite high potential are of limited current and are sometimes held in less regard.

When servicing the high voltage system, remove static charge from it by connecting a 10K ohm resistor in series with an insulated wire (such as a test probe) between picture tube dag and 2nd anode lead. (AC line cord should be disconnected from AC outlet.)
1) Picture tube in this receiver employs integral implosion protection.
2) Replace with the same type number of picture tube for continued safety.
3) Do not lift picture tube by the neck.
4) Handle the picture tube only when wearing shatterproof goggles and after discharging the high voltage completely.

Service mode entry method

Press and hold the local key “vol down” and  “channel up” when power on the main switch, TV will enter into the service mode in adjustment mode. (the initial value of the EEPROM are automatically preset when the new EEPROM is used).  Service mode also can be reached by pressing the service key (code: 40Hex)

Press the channel up or dn key on the remote controller to select the items one by one in adjustment mode.

Using the volume up or down key on the remote controller, the data can be modified.

When press the local key “Vol Down and Channel Up” at the same time, it will be released from the service mode.

Press the  Menu key on the remote control to enter into the NVM mode.  Press menu key again to leave the NVM mode return to adjustment mode.  (it is not recommended to modify the data unless as listed in BUS SETUP data)

Press both channel up and volume down buttons on the TV set simultaneously or press the “service”(40HEX) key again, it will switch to the normal mode position, and the microprocessor is out of service mode.

Default locking password “0000”

Factory presetting

Press remote controller key of code “ED” for  4 seconds, the initial values are automatically preset.

Make sure whether the data need to modify or not (initial data)

If haven’t done this initialization, malfunction might happen.

Below are the adjustment items that should be done, otherwise some adjustment items will not be accurate.

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Adjustment instruction with default factory data

When the EEPROM has been replaced, the SVC data should be restored as the function of individual system and specification.
When the EEPROM has been replaced White Balance Checking.
To Enter and exit SVC mode
Note: into the SVC mode, Initialize with default data.
1) Press 5 Seconds MENU buttons on both TV set and Remote Controller at the same time to get into SVC mode.
2) Press the PR ▲▼ button several times to find SVC Data.
3) Input the corresponding SVC data referring to Table below with the VOL ◀▶ , key.
4) Press TV/AV button to exit SVC mode.

White balance checking

Disassemble procedure

Schematic diagram