Sony PMC-D307L / PMC-D40L Service Manual ▷ View online
– 9 –
3-8. AMPLIFIER, TERMINAL, JACK BOARD
3-9. POWER BOARD
5
BVTP 3x10
3
BVTP 3x10
4
BVTP 3x10
1
CNP503
2
CNP505
8
JACK board
7
TERMINAL board
6
AMPLIFIER board
1
CNP501
4
P 4x6
3
P 4x6
2
P 3x6
5
POWER board
– 10 –
Mode
Tension Meter
Meter Reading
FWD
CQ-403A
more than 90 g
REV
CQ-403R
(more than 3.17 oz)
Mode
Torque Meter
Meter Reading
FWD
CQ-102C
30 – 70 g•cm
(0.42 – 1.02 oz•inch)
FWD
2.0 – 6.0 g•cm
Back tension
(0.028 – 0.076 oz•inch)
REV
CQ-102RC
30 – 70 g•cm
(0.42 – 1.02 oz•inch)
REV
2.0 – 6.0 g•cm
Back tension
(0.028 – 0.076 oz•inch)
80 – 170 g•cm
FF, REW
CQ-201B
(1.12 – 2.38 oz•inch)
32
Ω
test tape
WS-48B
(3 kHz, 0dB)
WS-48B
(3 kHz, 0dB)
set
2
(headphones) jack
digital frequency
counter
counter
Tape Speed Adjustment
Procedure:
Mode: playback
Mode: playback
Frequency difference between the beginning and the end of the tape
should be within 1% (30 Hz).
should be within 1% (30 Hz).
Adjustment Location:
Adjustment Values:
SECTION 5
ELECTRICAL ADJUSTMENTS
SECTION 4
MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab:
record/playback/erase head
pinch roller
rubber belts
capstan
idlers
2. Demagnetize the record/playback/erase head with a head de-
magnetizer. (Do not bring the head demagnetizer close to the
erase head.)
erase head.)
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
5. The adjustments should be performed with the rated power sup-
ply voltage unless otherwise noted.
Torque Measurement
Tape Tension Measurement
Standard Output Level
Test Tape
TAPE SECTION 0 dB = 0.775 V
1. The adjustments should be performed in the order given in the
service manual. (As a general rule. Playback circuit adjustment
should be completed before performing recording circuit ad-
justment.)
should be completed before performing recording circuit ad-
justment.)
2. The adjustments should be performed for both L-ch and R-ch
unless otherwise indicated.
SP OUT
PHONES
Load impedance
6
Ω
32
Ω
Output level
0.775 V (0 dB)
0.25 V (–10 dB)
Type
Signal
Used for
WS-48B
3 kHz, 0 dB
Tape speed adjustment
P-4-A063
6.3 kHz, –10 dB
Head azimuth adjustment
Digital frequency counter
2,970 to 3,030 Hz
adjustable
resistor
resistor
M691
– 11 –
3. Phase Check
Mode: playback
+
–
–
V
H
+
–
Screen pattern
set
L-CH
32
Ω
test tape
P-4-A063
(6.3 kHz, –10 dB)
P-4-A063
(6.3 kHz, –10 dB)
2
(headphones) jack
R-CH
32
Ω
oscilloscope
Good
Wrong
in phase 45
°
90
°
135
°
180
°
4. After the adjustment, lock the screws with locking compound.
forward
screwdriver
reverse
screw
position
position
L-CH
peak
peak
within
1dB
1dB
output
level
level
L-CH
peak
peak
R-CH
peak
peak
within
1dB
1dB
screw
angle
angle
R-CH
peak
peak
Record/Playback Head Azimuth Adjustment
Procedure:
1. Mode: playback
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.
of output levels match together within 1 dB.
+
–
–
set
32
Ω
level meter
test tape
P-4-A063
(6.3 kHz, –10 dB)
P-4-A063
(6.3 kHz, –10 dB)
2
(headphones) jack
Adjustment Location:
– 12 –
FM FREQUENCY COVERAGE
ADJUSTMENT
Frequency Display
87.5 MHz
108 MHz
(65 MHz)
Reading on Digital voltmeter
1.3 V or more
9.0 V or less
(1.0 V or more) (10.0 V or less)
Adjustment Part
<confirmation> <confirmation>
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
<confirmation>
<confirmation>
87.5 MHz (68 MHz)
108 MHz (102 MHz)
MW FREQUENCY COVERAGE
ADJUSTMENT
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
( ) : East European model
Adjustment Location: TUNER board (See page 13.)
TUNER SECTION 0 dB = 1
µ
V
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
FUNCTION button: FM
22.5 kHz frequency
deviation by 400 Hz signal
output level : as low as possible
deviation by 400 Hz signal
output level : as low as possible
• MW/LW Section
Setting:
FUNCTION button: MW or LW
FUNCTION button: MW or LW
30% amplitude
modulation by 400 Hz signal
output level : as low as possible
modulation by 400 Hz signal
output level : as low as possible
• Connecting Level Meter (FM, MW and LW)
EXT ANT FM
jack (CNP2)
jack (CNP2)
FM RF signal
generator
generator
0.01
µ
F
set
digital
voltmeter
voltmeter
TP (VT)
2
(headphones) jack
set
32
Ω
level meter
(range: 0.5-5 V ac)
(range: 0.5-5 V ac)
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
AM RF signal
generator
generator
• 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.
done by the trimmer capacitors.
–tuner board (conductor side)–
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