DOWNLOAD Sony CMT-F3MD / HCD-F3MD Service Manual ↓ Size: 10.5 MB | Pages: 96 in PDF or view online for FREE

Model
CMT-F3MD HCD-F3MD
Pages
96
Size
10.5 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
cmt-f3md-hcd-f3md.pdf
Date

Sony CMT-F3MD / HCD-F3MD Service Manual ▷ View online

8
MC 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 customer.
Procedure:
1. Press the
I/1
button to turn the power on.
2. While pressing the 
[PLAY MODE/TUNING MODE]
 and
s
 (CD) buttons, press the
I/1
button.
3. The set is reset, and displays “COLD RESET”, then becomes standby status.
MC HOT RESET
This mode resets the set with the preset data kept stored in the memory. The hot reset mode function is same as if the power cord is plugged
in and out.
Procedure:
1. Press the
I/1
button to turn the power on.
2. While pressing the 
[PLAY MODE/TUNING MODE]
 and
HS
(CD) buttons, press the
I/1
button.
3. The set is reset, and becomes standby state.
LED/FLUORESCENT INDICATOR TUBE AND KEY TEST
Procedure:
1. Press the
I/1
button to turn the power on.
2. While pressing the 
[PLAY MODE/TUNING MODE]
 and
A
(CD) buttons, press the
I/1
button.
3. LEDs and fluorescent indicator tube are all turned on.
4. Press the
HS
(MD) button to enter the key test mode, and display “Key0 Vol0”.
5. 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 0, 1, 2 ... if turn the 
[VOLUME]
 knob clockwise, or it decreases like 9, 8, 7 ... if turn the 
[VOLUME]
 knob
counterclockwise.
6. To release from this mode, press three buttons in the same manner as step 2, or disconnect the power cord.
Note:
l m
and
M L
buttons are no longer taken into account, if it pressed within for a second.
CHANGE-OVER THE AM TUNING INTERVAL
• The AM tuning interval can be changed over 9 kHz or 10 kHz.
Procedure:
1. Press the
I/1
button to turn the power on.
2. Press the 
[FUNCTION]
 button to set the TUNER function, and press the 
[TUNER/BAND]
 button to select the band “AM”.
3. Press the
I/1
button to turn the power off.
4. When the power off, press the
I/1
button while pressing the 
[PLAY MODE/TUNING MODE]
 button, and the display of fluorescent
indicator tube changes to “AM 9k STEP” or “AM 10k STEP”, and thus the tuning interval is changed over.
9
MD SECTION
JIG FOR CHECKING BD (MD)  BOARD WAVEFORM
The special jig (J-2501-149-A) is useful for checking the waveform of the BD (MD) 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 : Tracking error signal (Traverse adjustment)
VC
: Reference level for checking the signal
RF
: RF signal (Check jitter)
CN110
RF
5P connector
6P connector
VC
TEO
IOP
I+3V
GND
Mechanism deck
RF
VC
TEO
for 
MDM-3
for 
MDM-5
IOP
I+3V
VC
RF
TEO
IOP
I+3V
GND
VC
RF
TEO
IOP
I+3V
GND
1
5
1
6
10
Note :
About “R”
As this unit has only a few buttons, some operations require the use of remote commander (RM-SF3MD/provided with unit: 1-476-068-11)
buttons. These operations are indicated as “R” in this manual.
Example:
MENU/NO “R”
...Press the 
[MENU/NO]
 button of the remote commander.
IOP DATA RECORDING AND DISPLAY WHEN OPTICAL PICK-UP AND NON-VOLATILE MEMORY (IC171 ON THE BD
(MD) 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 (IC171 on the BD (MD)
board), record the IOP value on the optical pick-up according to the following procedure.
Record Procedure:
1. Press the
I/1
button to turn the power on.
2. Press the 
[FUNCTION]
 button to set the MD function.
3. While pressing the
s
(MD) and
z
REC
buttons, press the
I/1
button to enter the MD test mode and display “[Check]”.
4. Press the
l
 
m
or
M
 
L
button to display “[Service]”, and press the
ENTER/YES “R”
button.
5. Press the
l
 
m
or
M
 
L
button to display “Iop Write”, and press the
ENTER/YES “R”
button.
6. The display becomes “Ref=@@@.@” (@ is an arbitrary number) and the numbers which can be changed will blink.
7. Input the IOP value written on the optical pick-up.
To select the number : Press the
l
 
m
or
M
 
L
button.
To select the digit
: Press the 
[SYNC REC]
 button.
8. When the
ENTER/YES “R”
button is pressed, the display becomes “Measu=@@@.@” (@ is an arbitrary number).
9. As the adjustment results are recorded for the step7 value. Leave it as it is and press the
ENTER/YES “R”
button.
10. “Complete!” will be displayed momentarily. The value will be recorded in the non-volatile memory and the display will become “Iop
Write”.
11. Press the 
[REPEAT]
 button to complete. “Standby” will be displayed.
Display Procedure:
1. Press the
I/1
button to turn the power on.
2. Press the 
[FUNCTION]
 button to set the MD function.
3. While pressing the
s
(MD) and
z
REC
buttons, press the
I/1
button to enter the MD test mode and display “[Check]”.
4. Press the
l
 
m
or
M
 
L
button to display “[Service]”, and press the
ENTER/YES “R”
button.
5. Press the
l
 
m
or
M
 
L
button to display “Iop Read”, and press the
ENTER/YES “R”
button.
6. “@@.@/##.#” is displayed and the recorded contents are displayed.
@@.@ : indicates the Iop value labeled on the pick-up.
##.#
: indicates the Iop value after adjustment
7. To release, press the 
[CD-MD SYNC]
 button or
MENU/NO “R”
button to display “Iop Read”. Then press the 
[REPEAT]
 button to
display “Standby”.
11
CHECKS PRIOR TO PARTS REPLACEMENT AND ADJUSTMENTS
Before performing repairs, perform the following checks to determine the faulty locations up to a certain extent.
Details of the procedures are described in “5 Electrical Adjustments”.
• 0.9 mW power
Specified value : 0.84 to 0.92 mW
• 7.0 mW power
Specified value : 6.8 to 7.2 mW
lop (at 7mW)
• Labeled on the optical pickup
Iop value ± 10mA
• Traverse waveform
Specified value : Below 10% offset
• Error rate check
Specified value : For points A, B
C1 error : About 200
AD error : Below 2
For point C
C1 error : Below 50
AD error : Below 2
• Error rate check
Specified value:
a.
When using test disc (MDW-74/AU-1)
C1 error : Below 80
AD error : Below 2
b.
When using check disc (TDYS-1)
C1 error : Below 50
• CPLAY error rate check
Specified value:
C1 error : Below 80
AD error : Below 2
• Unsatisfactory if displayed as T=@@ (##) [NG”
NG
(@@, ## are both arbitrary numbers)
Laser power check
(5-6-2 : See page 32)
Traverse check
(5-6-3 : See page 32)
Focus bias check
(5-6-4 : See page 33)
C PLAY check
(5-6-5 : See page 33)
Self-recording/playback
check
(5-6-6 : See page 33)
Temperature
compensation
offset check
(5-6-1 : See page 32)
Criteria for Determination
(Unsatisfactory if specified value is not satisfied)
• Clean the optical pick-up
• Adjust again
• Replace the optical pick-up
• Replace the optical pick-up
• Replace the optical pick-up
• Replace the optical pick-up
• Replace the optical pick-up
If always unsatisfactory:
• Replace the overwrite head
• Check for disconnection of the circuits around the
overwrite head
If occasionally unsatisfactory:
• Check if the overwrite head is distorted
• Check the mechanism around the sled
• Check for disconnection of the circuits around
D101 (BD (MD) board)
• Check the signals around IC101, IC121, CN102,
CN103 (BD (MD) board)
Measure if unsatisfactory:
Note:
The criteria for determination above is intended merely to determine if satisfactory or not, and does not serve as the specified value for adjustments.
When performing adjustments, use the specified values for adjustments.
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