DOWNLOAD Sony MDS-SP55 Service Manual ↓ Size: 3.87 MB | Pages: 57 in PDF or view online for FREE

5

.......................................................... 6

........................................................................ 13

3-1. Case ..................................................................................... 14
3-2. Front Panel Assy ................................................................. 14
3-3. MD Mechanism Deck (MDM-5A) ..................................... 15
3-4. Main Board ......................................................................... 15
3-5. Slider (Cam) ........................................................................ 16
3-6. BD Board ............................................................................ 16
3-7. Over Write Head ................................................................. 17
3-8. Optical Pick-up (KMS-260A/J1N) ..................................... 17
3-9. Spindle Motor, Sled Motor ................................................. 17

..................................................................... 18

............................... 22

6-1. Block Diagrams

• BD Section ....................................................................... 32
• Main Section .................................................................... 33

6-2. Printed Wiring Board – BD Section – ................................. 34
6-3. Schematic Diagram – BD (1/2) Section – ........................... 35
6-4. Schematic Diagram – BD (2/2) Section – ........................... 36
6-5. Schematic Diagram – Main (1/2) Section – ........................ 37
6-6. Schematic Diagram – Main (2/2) Section – ........................ 38
6-7. Printed Wiring Board – Main Section – .............................. 39
6-8. Printed Wiring Board – Panel Section – ............................. 40
6-9. Schematic Diagram – Panel Section – ................................ 41
6-10.  Schematic Diagram – BD Switch Section – .................... 42
6-11. Printed Wiring Board – BD Switch Section – .................. 42
6-12. IC Block Diagrams ........................................................... 42
6-13. IC Pin Functions ............................................................... 45

7-1. Case and Front Panel Section ............................................. 50
7-2. Mechanism Deck Section (MDM-5A) ................................ 51
7-3. Base Unit Section (MBU-5A) ............................................. 52

........................................ 53

— BACK PANEL —

• Abbreviation

AED

: North European model

MY

: Malaysia model

SP

: Singapore model

HK

: Hong kong model

KR

: Korea model

AEP, UK, AED models

HK, MY, SP models

KR model

4-229-665-0

s

4-229-665-2

s

4-229-665-3

s

6

This unit cannot be repaired by itself.
When repairing, connect the whole system except for the speaker.

• This unit displays CD text.

Text is displayed for the first 50 track only and will not be displayed from the 51st track onwards. Do not suspect a fault in this case.
In some cases, some special characters will not be displayed and may be replaced by other characters. Do not suspect a fault in this case.

• 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

customer.

Procedure :
1. When the power ON, press the  ?/1  button (TA) while pressing the  TUNING MODE  button (ST) and  ML  buttons (CD) together.
2. “COLD RESET” is displayed on the fluorescent indicator tube and reset is executed.

• This mode reset the preset data kept in the memory. The hot reset mode functions same as if the power cord is plugged in and out.

Procedure :
1. When the power ON, press the  ?/1  button (TA) while pressing the  TUNING MODE  button (ST) and  lm  buttons (CD) together.
2. Turn off the unit and reset is executed.

Procedure :
1. When the power ON, press the  ?/1  button (TA) while pressing the  TUNING MODE  button (ST) and  PLAY MODE  buttons (CD)

together.

2. LCD are all turned on.
3. Press  TUNING MODE  button (ST) to enter the model destination indecation mode. “SP55    CE2” or “SP55    ASIA2” appears.
4.

Every pressing of  TUNING MODE  button (ST) changes the display in the following order.
MC Version 

t CD Version t ST Version t TC Version t TA Version t TM Version t model destination display.

5.

Press  DISPLAY  button (ST) and the date appears as “ 00615a ”
Every pressing of  DISPLAY  button (ST) changes the display in the Version display and model destination display.

6. Press  TUNER/BAND  button (ST) to enter the key check mode.
7. In the key check mode, the fluorescent indicator tube displays “Key 0 Vol 0”. Each time a button is pressed, “Key” value increases.

However, once a button is pressed, it is no longer taken into account.
“Vol” Value increases like “1, 2, 3 ...” if rotating  VOLUME  knob (TA) in the clockwise direction, or decreases like “0, 9, 8 ...” if rotating
in the counterclockwise diretion.

8. To exit from this mode, disconnect the power cord.

7

The special jig (J-2501-149-A) is useful for checking the waveform of the BD board. The names of terminals and the checking items to be
performed are shown as follows.

GND : Ground
I+3V : For measuring IOP (Check the deterioration of the optical pick-up laser)
IOP : For measuring IOP (Check the deterioration of the optical pick-up laser)
TEO : TRK error signal (Traverse adjustment)
VC

: Reference level for checking the signal

RF

: RF signal (Check jitter)

8

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 (IC171 of BD board),
record the IOP value on the optical pick-up according to the following procedure.

Record Precedure:
1. When the power OFF (STANDBY), press the  ?/1  button (TA) while pressing the  s  button (MD) and  ENTER/YES  button (MD)

together.

2. Press the  MENU/NO  button (MD), and when “Check” is displayed.
3. Rotate the  l L  knob (MD) to display “MD [Service]”, and press the  ENTER/YES  button (MD).
4. Rotate the  l L  knob (MD) to display “MD lop Write”, and press the  ENTER/YES  button (MD).
5. The display becomes “MD Ref=@@@.@” (@ is an arbitrary number) and the numbers which can be changed will blink.
6. Input the IOP value written on the optical pick-up.

To select the number : Press the  MENU/NO  button (MD), and when “Check” is displayed.
To select the digit

: Press the  CD SYNC REC  button (MD).

7. When the  ENTER/YES  button (MD) is pressed, the display becomes “MD Measu=@@@.@” (@ is an arbitrary number).
8. As the adjustment results are recorded for the 6 value. Leave it as it is and press the  ENTER/YES  button (MD).
9. “MD Complete!” will be displayed momentarily. The value will be recorded in the non-volatile memory and the display will become

“MD Iop Write”.

10. Press the  ?/1  button (TA) to complete.

Display Precedure:
1. When the power OFF (STANDBY), press the  ?/1  button (TA) while pressing the  s  button (MD) and  ENTER/YES  button (MD)

together.

2. Press the  MENU/NO  button (MD), and when “Check” is displayed.
3. Rotate the  l L  knob (MD) to display “MD [Service]”, and press the  ENTER/YES  button (MD).
4. Rotate the  l L  knob (MD) to display “MD lop Read”.
5. “MD @@.@/##.#” is displayed and the recorded contents are displayed.

@@.@ : indicates the Iop value labeled on the pick-up.
##.#

: indicates the Iop value after adjustment

6. To end, press the  MENU/NO  button (MD) to display “MD Iop Read”. Then press the  ?/1  button (TA).