SONY MDSS50
Service Manual

MDS-S50

IOP DATA RECORDING AND DISPLAY WHEN OPTICAL PICK-UP AND NON-VOLATILE MEMORY (IC195 OF BD BOARD) ARE REPLACED
The IOP value labeled on the optical pick-up can be recorded in the non-volatile memory. By recording the value, it will eliminate the need to look at the value on the label of the optical pick-up. When replacing the optical pick-up or non-volatile memory (IC195 of BD board), record the IOP value on the optical pick-up according to the following procedure. Record Precedure: 1. While pressing the [.AMS >] knob and x button simultaneously, connect the power plug to the outlet, and release the [.AMS > ] knob and x button simultaneously to display �[Check]�. 2. Turn the [ . AMS > ] knob to display �[Service]�, and press the [YES] button to display �[AUTO CHECK]� (C01). 3. Turn the [ . AMS > ] knob to display �Iop Write� (C05), and press the [YES] button. 4. The display becomes �Ref=@@@.@� (@ is an arbitrary number) and the numbers which can be changed will blink. 5. Input the IOP value written on the optical pick-up. To select the number : Turn the [ .AMS > ] knob. To select the digit : Press the [ .AMS > ] knob. 6. When the [YES] button is pressed, the display becomes �Measu=@@@.@� (@ is an arbitrary number). 7. As the adjustment results are recorded for the 6 value. Leave it as it is and press the [YES] button. 8. �Complete!!� will be displayed momentarily. The value will be recorded in the non-volatile memory and the display will become �Iop Write� (C05). 9. Press the I/1 button to complete. Display Precedure: 1. While pressing the [. AMS >] knob and x button simultaneously, connect the power plug to the outlet, and release the [.AMS > ] knob and x button simultaneously to display �[Check]�. 2. Turn the [. AMS > ] knob to display �[Service]�, and press the [YES] button to display �[AUTO CHECK]� (C01). 3. Turn the [. AMS > ] knob to display �Iop Read� (C26). 4. �@@.@/##.#� is displayed and the recorded contents are displayed. @@.@ : indicates the IOP value labeled on the optical pick-up. ##.# : indicates the IOP value after adjustment 5. To end, press the [. AMS > ] knob or [MENU/NO] button to display �Iop Read� (C26). Then press the I/1 button.

WHEN MEMORY NG IS DISPLAYED
If the nonvolatile memory data is abnormal, �E001 MEMORY NG� will be displayed so that the MD deck does not continue operations. In this case, set the test mode promptly and perform the following procedure. Procedure: 1. Enter the test mode (refer to page 17). 2. Normally a message for selecting the test mode will be displayed. However if the nonvolatile memory is abnormal, the following will be displayed �INIT EEP?�. 3. Press the both x and Z buttons simultaneously. 4. Turn the [. AMS > ] knob to display �MDM-7A�. 5. Press the [ . AMS >] button. If the nonvolatile memory is successfully overwritten, the normal test mode will be set and a message to select the test mode will be displayed.

FORCE RESET
You can reset the microprocessor of the system with following procedure. Use this method if the device cannot be operated normaly because the microprocessor is hung up or with some reasons. Procedure: Remove the short pin attached on CN420, then install it again. � MAIN BOARD (Component Side) �

CN420

9