DOWNLOAD Sony PMC-DR45 Service Manual ↓ Size: 7.72 MB | Pages: 68 in PDF or view online for FREE

Model
PMC-DR45
Pages
68
Size
7.72 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
pmc-dr45.pdf
Date
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– 17 –
screw
position
L-CH
peak
within
1dB
output
level
L-CH
peak
R-CH
peak
within
1dB
screw
angle
R-CH
peak
3. Phase Check
Mode: FWD/REV playback
4. After the adjustment, lock the screws with locking compound.
Record/Playback/Erase Head Azimuth Adjustment
Procedure:
1. Mode: FWD/REV 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-A100
(10 kHz, –10 dB)
i
 (headphones) jack (J301)
+
–
V
H
+
–
Screen pattern
set
L-CH
32 
Ω
test tape
P-4-A100
(10 kHz, –10 dB)
i
 (headphones) jack (J301)
R-CH
32 
Ω
oscilloscope
Good
Wrong
in phase 45 
°
90 
°
135 
°
180 
°
screwdriver
FWD
(forward)
REV
(reverse)
– 18 –
FM FREQUENCY COVERAGE
ADJUSTMENT
Frequency Display
87.5 MHz
108 MHz
Reading on Digital voltmeter
1.5 ± 0.1 V
3.8 ± 0.4 V
Adjustment Part
L2
<confirmation>
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
CT1
87.5 MHz
108 MHz
FM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T2
10.7 MHz (Display: 98 MHz)
AM FREQUENCY COVERAGE
ADJUSTMENT
Frequency Display
530 kHz
1,710 kHz
Reading on Digital voltmeter
0.9 ± 0.1 V
5.1 ± 0.4 V
Adjustment Part
T4
<confirmation>
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
T3
CT3
620 kHz
1,400 kHz
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
450 kHz (Display: 1,000 kHz)
Adjustment Location: TUNER board (See page 19.)
5-2. TUNER SECTION     0 dB = 1 µV
• FM Section
Setting:
BAND button: FM
75 kHz frequency
deviation by 1 kHz signal
output level : as low as possible
• AM Section
Setting:
BAND button: AM
30% amplitude
modulation by 400 Hz signal
output level : as low as possible
• Connecting Level Meter (FM and AM)
FM terminal
(J1)
FM RF signal
generator
0.01 
µ
F
set
Put the lead-wire
antenna close to
the AM  loop
antenna.
AM RF signal
generator
i
 (headphones) jack (J301)
set
32 
Ω
level meter
(range: 0.5-5 V ac)
digital
voltmeter
tuner board
TP (VT)
• Connecting Digital Voltmeter (FM and AM)
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
– 19 –
Adjustment Location:
L2
FM
FREQUENCY
COVERAGE
ADJUSTMENT
T4
AM
FREQUENCY
COVERAGE
ADJUSTMENT
T1
AM IF
ADJUSTMENT
CT1
L1
FM TRACKING
ADJUSTMENT
T3
CT3
AM TRACKING
ADJUSTMENT
TP(VT)
TM1
FM
TERMINAL
– TUNER BOARD (COMPONENT SIDE) –
T2
FM IF
ADJUSTMENT
(conductor side)
– 20 –
Adjustment Location: CD board
TP(RF)
IC701
IC702
–CD BOARD (CONDUCTOR SIDE) –
5-3. CD SECTION
Focus Bias Check
This check is to be done when the optical block replaced.
Check Procedure:
1. Connect the oscilloscope to test point  TP (RF) on CD board.
Insert disk (YEDS-18 (3-702-101-01)).
2. Press the u button.
3. Check that the oscilloscope waveform is as shown in the figure
below (eye pattern).
A good eye pattern means that the diamond shape (    ) in the
center of the waveform can be clearly distinguished.
4. Release test mode after adjustment is completed.
• RF signal reference waveform (eye pattern)
VOLT/DIV : 50mV
TIME/DIV  : 500 ns
(With the 10:1 probe in use)
1.1- 1.3 Vp-p
When observing the eye pattern, set the oscilloscope for AC range
and raise vertical sensitivity.
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