Sony MDS-PC1 Service Manual ▷ View online
– 5 –
TABLE OF CONTENTS
1. SERVICING NOTE
.......................................................... 6
2. GENERAL
.......................................................................... 9
3. DISASSEMBLY
3-1. Front Panel ......................................................................... 29
3-2. Back Panel and Main Board ............................................... 30
3-3. Bracket (T)/(L)/(R) ............................................................. 31
3-4. SUB Chassis ....................................................................... 31
3-5. Shutter Assembly ................................................................ 32
3-6. Slider Complete Assembly .................................................. 33
3-2. Back Panel and Main Board ............................................... 30
3-3. Bracket (T)/(L)/(R) ............................................................. 31
3-4. SUB Chassis ....................................................................... 31
3-5. Shutter Assembly ................................................................ 32
3-6. Slider Complete Assembly .................................................. 33
4. TEST MODE
..................................................................... 34
5. ELECTRICAL ADJUSTMENTS
............................... 38
6. DIAGRAMS
6-1. Circuit Boards Location ...................................................... 43
6-2. Block Diagrams
6-2. Block Diagrams
• BD Section ....................................................................... 45
• Main Section .................................................................... 47
• Main Section .................................................................... 47
6-3. Schematic Diagram – BD (1/2) Section – ........................... 51
6-4. Schematic Diagram – BD (2/2) Section – ........................... 53
6-5. Printed Wiring Board – BD Section – ................................. 55
6-6. Printed Wiring Board – SW Section – ................................ 57
6-7. Schematic Diagram – SW Section – ................................... 58
6-8. Printed Wiring Board – Main Section – .............................. 59
6-9. Schematic Diagram – Main (1/3) Section – ........................ 61
6-10. Schematic Diagram – Main (2/3) Section – ...................... 63
6-11. Schematic Diagram – Main (3/3) Section – ...................... 65
6-12. Printed Wiring Board – Panel Section – ............................ 67
6-13. Schematic Diagram – Panel Section – .............................. 69
6-14. IC Block Diagrams ........................................................... 71
6-15. IC Pin Functions ............................................................... 76
6-4. Schematic Diagram – BD (2/2) Section – ........................... 53
6-5. Printed Wiring Board – BD Section – ................................. 55
6-6. Printed Wiring Board – SW Section – ................................ 57
6-7. Schematic Diagram – SW Section – ................................... 58
6-8. Printed Wiring Board – Main Section – .............................. 59
6-9. Schematic Diagram – Main (1/3) Section – ........................ 61
6-10. Schematic Diagram – Main (2/3) Section – ...................... 63
6-11. Schematic Diagram – Main (3/3) Section – ...................... 65
6-12. Printed Wiring Board – Panel Section – ............................ 67
6-13. Schematic Diagram – Panel Section – .............................. 69
6-14. IC Block Diagrams ........................................................... 71
6-15. IC Pin Functions ............................................................... 76
7. EXPLODED VIEWS
7-1. Front Panel Section ............................................................. 84
7-2. Chassis Section ................................................................... 85
7-3. Mechanism Deck Section 1 (MDM-3B) ............................. 86
7-4. Mechanism Deck Section 2 (MDM-3B) ............................. 87
7-2. Chassis Section ................................................................... 85
7-3. Mechanism Deck Section 1 (MDM-3B) ............................. 86
7-4. Mechanism Deck Section 2 (MDM-3B) ............................. 87
8. ELECTRICAL PARTS LIST
........................................ 88
SAFETY CHECK-OUT
After correcting the original service problem, perform the follow-
ing safety checks before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs, screws,
and all other exposed metal parts for AC leakage. Check leakage as
described below.
ing safety checks before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs, screws,
and all other exposed metal parts for AC leakage. Check leakage as
described below.
LEAKAGE
The AC leakage from any exposed metal part to earth Ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microampers). Leak-
age current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microampers). Leak-
age current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers’ instructions to use these
instruments.
instruments.
2. A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a VOM
or battery-operated AC voltmeter. The “limit” indication is 0.75
V, so analog meters must have an accurate low-voltage scale.
The Simpson 250 and Sanwa SH-63Trd are examples of a pas-
sive VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are suitable. (See Fig. A)
V, so analog meters must have an accurate low-voltage scale.
The Simpson 250 and Sanwa SH-63Trd are examples of a pas-
sive VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are suitable. (See Fig. A)
Fig. A. Using an AC voltmeter to check AC leakage.
AC
voltmeter
(0.75V)
voltmeter
(0.75V)
1.5k
Ω
0.15
µ
F
Earth Ground
To Exposed Metal
Parts on Set
Parts on Set
– 6 –
SECTION 1
SERVICING NOTE
BD BOARD WAVEFORM CHECK TOOL
Use the jig (J-2501-124-A or J-2501-149-A) to facilitate the checking of the waveform of the BD board. The names and check items of each
terminal are as follows.
terminal are as follows.
I+3V : For measuring the IOP (check if the optical pick-up laser has weakened)
IOP
IOP
: For measuring IOP (check if the optical pick-up laser has weakened)
TEO : TRK error signal (traverse adjustment)
VC
VC
: Reference level for checking signals
RF
: RF signal (jitter check)
[FORCED RESET]
Perform forced reset if the unit does not operate normally due to the hangup of the microprocessor.
It is recommended that this be performed when the test mode and retry cause display mode cannot be exited, or when the unit does not
operate normally when reassembled after being disassembled.
It is recommended that this be performed when the test mode and retry cause display mode cannot be exited, or when the unit does not
operate normally when reassembled after being disassembled.
Method:Disconnect the power plug from the outlet, short-circuit the JW143 and 164 (RESET) of the MAIN board using a pair of tweezers,
and discharge the backup battery.
and discharge the backup battery.
[MAIN BOARD] (Component Side)
JW143
JW164
IC401
CN307
IC101
CN110
6P connector
GND can not be used.
Mechanism deck
Jig
(J-2501-124A)
Jig
(J-2501-149A)
RF
VC
TEO
IOP
H-3V
RF
VC
TEO
IOP
I+3V
GND
– 7 –
RETRY CAUSE DISPLAY MODE
* In this test mode, the causes for retry of the unit during recording and stop can be displayed on the fluorescent display tube. During
playback, the “track mode” for obtaining track information will be set.
This is useful for locating the faulty part of the unit.
This is useful for locating the faulty part of the unit.
* The following will be displayed:
During recording and stop :Retry cause, number of retries, and number of retry errors.
During playback
During playback
:Information such as type of disc played, part played, copyright.
These are displayed in hexadecimal.
Procedure:
1. Load a recordable disc whose contents can be erased into the unit.
2. Press the MENU/NO button. When “Edit Menu” is displayed on the fluorescent display tube, rotate the AMS dial to display “All
1. Load a recordable disc whose contents can be erased into the unit.
2. Press the MENU/NO button. When “Edit Menu” is displayed on the fluorescent display tube, rotate the AMS dial to display “All
Erase?”.
3. Press the YES button. (Or press the AMS dial)
4. When “All Erase??” is displayed on the fluorescent display tube, the music calendar number blinks.
5. Press the YES button to display “Complete!!”, and press the p button immediately. Wait for about 15 seconds while pressing the button.
4. When “All Erase??” is displayed on the fluorescent display tube, the music calendar number blinks.
5. Press the YES button to display “Complete!!”, and press the p button immediately. Wait for about 15 seconds while pressing the button.
(The AMS dial can be pressed instead of the YES button for the same results.)
6. When the “TOC” displayed on the fluorescent display tube goes off, release the p button.
7. Press the rREC button to set the recording standby state. Then press the ·P button to start recording.
8. Press the DISPLAY/CHAR button and check the test mode display (Fig. 1).
9. To check the “track mode”, press the ·P button to start play. Then press the DISPLAY/CHAR button to display the test mode display
7. Press the rREC button to set the recording standby state. Then press the ·P button to start recording.
8. Press the DISPLAY/CHAR button and check the test mode display (Fig. 1).
9. To check the “track mode”, press the ·P button to start play. Then press the DISPLAY/CHAR button to display the test mode display
(Fig. 2), and check the display.
10. To exit the test mode, press the 1/u button to turn OFF the power. When “TOC” disappears, disconnect the power plug from the outlet.
If the test mode cannot be exited, refer to “Forced Reset” on page 5.
Fig. 1 Reading the Test Mode Display (During recording and stop)
RTs@@c##e**
Fluorescent display tube display
@@: Cause of retry
## : Number of retries
** : Number of retry errors
## : Number of retries
** : Number of retry errors
Fig. 2 Reading the Test Mode Display (During playback)
@@####** $$
Fluorescent display tube display
@@: Parts No. (name of area named on TOC)
## : Cluster
** : Sector
$$ : Track mode (Track information such as copyright information of each part)
## : Cluster
** : Sector
$$ : Track mode (Track information such as copyright information of each part)
Reading the Retry Cause Display
Hexadecimal
Bit
Binary
Higher Bits
Lower Bits
8
4
2
1
8
4
2
1
b7 b6 b5 b4 b3 b2 b1 b0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
0
When track jump (shock) is detected
When ADIP address is not continuous
When ADER was counted more than five times
continuously
When DIN unlock is detected
When not in focus
When ABCD signal level exceeds the specified range
When CLV is unlocked
When access operation is not performed normally
Hexa-
decimal
shock
Discontinuous address
ader5
DIN unlock
FCS incorrect
IVR rec error
CLV unlock
Access fault
Cause of Retry
Occurring conditions
01
02
04
08
10
20
40
80
}
Address (Physical address on disc)
– 8 –
Reading the Display:
Convert the hexadecimal display into the binary display. If more than two causes, they will be added.
Convert the hexadecimal display into the binary display. If more than two causes, they will be added.
Example
When 44 is displayed:
When 44 is displayed:
Upper bit : 4=0100 n b6
Lower bit : 4=0010 n b2
In this case, the retry cause is combined of “CVL unlock” and “ader5”.
Lower bit : 4=0010 n b2
In this case, the retry cause is combined of “CVL unlock” and “ader5”.
When A4 is displayed:
Upper bit : A=1010 n b7+b5
Lower bit : 4=0010 n b2
The retry cause in this case is combined of “access fault”, “IVR rec error”, and “ader5”.
Lower bit : 4=0010 n b2
The retry cause in this case is combined of “access fault”, “IVR rec error”, and “ader5”.
Reading the Track Mode Display
Reading the Display:
Convert the hexadecimal display into the binary display. Several cause are added and displayed.
Convert the hexadecimal display into the binary display. Several cause are added and displayed.
Example
When 84 is displayed:
When 84 is displayed:
Upper bit : 8=1000 n b7
Lower bit : 4=0100 n b2
In this case, as b2 and b7 are 1 and others are 0, the cause is combined of “Emphasis OFF”, “Monaural”, “Original”, Copyrighted” and
“Write permitted”.
Lower bit : 4=0100 n b2
In this case, as b2 and b7 are 1 and others are 0, the cause is combined of “Emphasis OFF”, “Monaural”, “Original”, Copyrighted” and
“Write permitted”.
When 07 is displayed:
Upper bit : 0=0000 n all 0
Lower bit : 7=0111 n b0+b1+b2
In this case, as b0, b1, and b2 are 1 and others are 0, the cause is combined of “Emphasis ON”, “Stereo”, “Original”, Copyrighted” and
“Write prohibited”.
Lower bit : 7=0111 n b0+b1+b2
In this case, as b0, b1, and b2 are 1 and others are 0, the cause is combined of “Emphasis ON”, “Stereo”, “Original”, Copyrighted” and
“Write prohibited”.
Hexadecimal
Bit
Binary
Higher Bits
Lower Bits
8
4
2
1
8
4
2
1
b7 b6 b5 b4 b3 b2 b1 b0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
0
Hexa-
decimal
Details
01
02
04
08
10
20
40
80
Emphasis OFF
Monaural
This is 2-bit display. Normally 01.
01:Normal audio. Others:Invalid
Audio (Normal)
Original
Copyright
Write prohibited
When 0
When 1
Emphasis ON
Stereo
Invalid
Digital copy
No copyright
Write allowed
Hexadecimal
Binary
Hexadecimal
Binary
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
Hexadecimal/Decimal Conversion Table
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