DOWNLOAD Sony PMC-D407L Service Manual ↓ Size: 7.53 MB | Pages: 68 in PDF or view online for FREE

Model
PMC-D407L
Pages
68
Size
7.53 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
pmc-d407l.pdf
Date
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– 13 –
screw
position
L-CH
peak
within
1dB
output
level
L-CH
peak
R-CH
peak
within
1dB
screw
angle
R-CH
peak
forward
screwdriver
reverse
3. Phase Check
Mode: playback
4. After the adjustment, lock the screws with locking compound.
Record/Playback/Erase Head Azimuth Adjustment
Procedure:
1. Mode: playback
2. Turn the adjustment screw for the maximum output levels. If
these levels do not match, turn the adjustment screw until both
of output levels match together within 1 dB.
Adjustment Location:
+
–
set
32 
Ω
level meter
test tape
P-4-A063
(6.3 kHz, –10 dB)
2
 (headphones) jack
+
–
V
H
+
–
Screen pattern
set
L-CH
32 
Ω
test tape
P-4-A063
(6.3 kHz, –10 dB)
2
 (headphones) jack
R-CH
32 
Ω
oscilloscope
Good
Wrong
in phase 45 
°
90 
°
135 
°
180 
°
– 14 –
FM FREQUENCY COVERAGE
CHECK
Frequency Display
87.5 MHz
108 MHz
Reading on Digital voltmeter
1.3 V or more
9.0 V or less
Adjustment Part
<confirmation> <confirmation>
FM TRACKING  CHECK
Adjust for a maximum reading on level meter.
<confirmation>
<confirmation>
87.5 MHz
108 MHz
MW FREQUENCY COVERAGE
CHECK
Frequency Display
531 kHz
1,611 kHz
Reading on Digital voltmeter
0.85 ± 0.5 V
6.8 ± 1.5 V
Adjustment Part
<confirmation> <confirmation>
MW TRACKING  ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
CT4
621 kHz
1,404 kHz
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
CFT1
450 kHz
LW FREQUENCY COVERAGE
ADJUSTMENT
Frequency Display
153 kHz
279 kHz
Reading on Digital voltmeter
0.6 ± 0.4 V
7.5 ± 0.5 V
Adjustment Part
<confirmation>
L4
LW TRACKING  ADJUSTMENT
Adjust for a maximum reading on level meter.
L5
CT5
162 kHz
261 kHz
Adjustment Location: TUNER board (See page 15.)
  TUNER SECTION     0 dB = 1 µV
Precautions in Repairing
Note : As a tuner unit (TU1) is difficult to repair if faulty,
replace it with new one.
• FM Section
Setting:
FUNCTION button: FM
22.5 kHz frequency
deviation by 400 Hz signal
output level : as low as possible
• MW/LW Section
Setting:
FUNCTION button: MW or LW
30% amplitude
modulation by 400 Hz signal
output level : as low as possible
• Connecting Level Meter (FM, MW and LW)
• Connecting Digital Voltmeter (FM, MW and LW)
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
EXT ANT FM 
jack (CNP2)
FM RF signal
generator
0.01 
µ
F
set
Put the lead-wire
antenna close to
the set.
AM RF signal
generator
2
 (headphones) jack
set
32 
Ω
level meter
(range: 0.5-5 V ac)
digital
voltmeter
tuner board
TP (VT)
– 15 –
Adjustment Location:
– tuner board (component side) –
TU1
TP
(VT)
IC1
CFT1
AM IF 
ADJUSTMENT
CT5
L5
LW
TRACKING
ADJUSTMENT
CNP2
EXT ANT FM
CT4
L3
MW
TRACKING
ADJUSTMENT
L4
LW
FREQUENCY
COVERAGE
ADJUSTMENT
– 16 –
E-F Balance Adjustment
This adjustment is to be done when the optical pick-up is replaced.
Procedure:
1. Connect the oscilloscope to TP (TRACKING-Y) and TP (VC)
on the CD board.
2. Insert the disc (YEDS-18) in and close the lid (CD).
3. Put the set into test mode.
4. Press the 
+ and = buttons to move the optical pick-up to
the center.
5. Press the 
( button.
From focus searching, focus is turned ON while entering
CLV drawing-in mode. Tracking and sled are turned OFF.
6. Adjust RV703 so that the oscilloscope traverse waveform is sym-
metrical, as shown in the figure below.
Adjustment value: 0.4 ± 0.2 Vp-p (A + B)
7. Release the test mode after adjustment is completed.
Adjustment Location: CD board (See page 19.)
How to Release the Test Mode
1. Be sure to disconnect the AC plug cord and remove the solder
bridge at the TEST1 terminal connected before in setting.
2. The set thus becomes available for normal operation
Before Beginning Adjustment
Put the set into test mode and perform the following checks.
Repair if there are any problems.
• Sled Motor Check
Press the 
+, = buttons and confirm that the optical pick-up
moves smoothly from the innermost to outermost circumference
and back smoothly and with no catching or abnormal noises.
+ : Optical pick-up moves to the outer circumference
= : Optical pick-up moves to the inner circumference
• Focus Search Check
1. Press the 
( button. (Focus search operation is performed con-
tinuously.)
2. Look at the optical pick-up objective lens and confirm that it
moves up and down smoothly, when no catching or abnormal
noises.
3. Press the 
p button.
Confirm that focus search operation stops. If it does not , press
the 
p button again longer.
Note: When the malfunction is occurred by mis-passing other keys, turn
off the power and check again from making the test mode.
Notes on Adjustment
1. Perform adjustment in test mode.
After adjustments, be sure to release test mode.
2. Perform adjustments in the order given.
3. Use the disc (YEDS-18. Part No. 3-702-101-01) only when so
indicated.
How to Put the Set into Test Mode
1. Disconnect an AC plug cord. (Power is not applied to the set.)
2. Solder across the TEST1 terminal.
3. Close the lid (CD).
4. Connect an AC plug cord.
[SW1  BOARD] (Conductor Side)
CD SECTION
+
–
CD board
TP (TRACKING-Y)
TP (VC)
oscilloscope
(DC range)
A
B
0 V
A
B
0 V
A=B
Note: Take long sweep time
for easy monitoring.
VOLT/DIV: 0.2 V (with the 10:1 probe in use.)
TIME/DIV: 1 ms
A=B
TEST1
terminal
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