Sony PMC-D305 / PMC-D305L Service Manual ▷ View online
– 25 –
1
connector
(CNP505)
6
chassis (AMP)
section
5
two screws
(BVTP 3
×
10)
5
three screws
(BVTP 3
×
10)
4
connector
(CNP503)
5
six screws
(BVTP 3
×
10)
2
two screws
(BVTP 3
×
10)
2
screw
(BVTP 3
×
10)
2
four screws
(BVTP 3
×
10)
3
transformer
section
2
POWER AMP, TERMINAL,
JACK board
1
two screws
(BVTP 3
×
10)
1
two screws
(BVTP 3
×
10)
1
screw
(BVTP 3
×
10)
TRANSFORMER, CHASSIS (AMP) SECTION
POWER AMP, TERMINAL, JACK BOARD
– 26 –
SECTION 4
MECHANICAL ADJUSTMENTS
SECTION 5
ELECTRICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab:
record/playback head pinch roller
erase head
erase head
rubber belts
capstan
idlers
2. Demagnetize the record/playback head with a head demagne-
tizer. (Do not bring the head demagnetizer close to the erase
head.)
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
Mode
Tension Meter
Meter Reading
FWD
CQ-403A
more than 90 g (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)
80-170 g•cm
FF
CQ-201B
(1.12-2.38 oz•inch)
80-170 g•cm
REW
CQ-201B
(1.12-2.38 oz•inch)
Tape Tension Measurement
Standard Output Level
Test Tape
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 out-
put levels match together within 1 dB.
put levels match together within 1 dB.
+
–
–
set
32
Ω
PHONES jack
level meter
test tape
P-4-A063
(6.3 kHz, –10 dB)
P-4-A063
(6.3 kHz, –10 dB)
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
1. The adjustments should be perfomed 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.
0 dB=0.775 V
TAPE DECK SECTION
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
– 27 –
32
Ω
test tape
WS-48B
(3 kHz, 0dB)
WS-48B
(3 kHz, 0dB)
set
PHONES jack
speed checker
LFM-30 or
digital frequency
counter
LFM-30 or
digital frequency
counter
Tape Speed Adjustment
Procedure:
Mode: playback
Mode: playback
3. Phase Check
Mode: playback
+
–
–
V
H
+
–
Screen pattern
Good
Wrong
in phase 45
°
90
°
135
°
180
°
PHONES jack
set
R-CH
L-CH
32
Ω
32
Ω
oscilloscope
test tape
P-4-A063
(6.3 kHz, –10 dB)
P-4-A063
(6.3 kHz, –10 dB)
4. After the adjustment, lock the screws with locking compound.
Adjustment Location:
Frequency difference between the beginning and the end of the
tape should be within 1% (30 Hz).
tape should be within 1% (30 Hz).
Adjustment Location:
Speed checker
Digital frequency counter
–1% to +1%
2,970 to 3,030 Hz
Adjustment Values:
M691
adjustable
resistor
resistor
forward
reverse
screwdriver
– 28 –
AM FREQUENCY COVERAGE CONFIRM
Confirm for a reading on digital voltmeter.
Confirm
530 kHz <531 kHz>
1.0 ±0.5 V
Confirm
1,710 kHz <1611 kHz>
5.0 ± 1.0 V <4.8 ± 1.0 V>
TUNER SECTION
Precautions in Repairing
Note: As a FM front-end (TU1) is difficult to repair if faulty, replace it
with new one.
[AM]
FUNCTION Switch: RADIO
BAND Switch: AM, MW, LW
BAND Switch: AM, MW, LW
[FM]
FUNCTION Switch: RADIO
BAND Switch: FM
BAND Switch: FM
• 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.
• Abbreviation
D305: PMC-D305
D305L: PMC-D305L
D305L: PMC-D305L
AM RF SSG
30% amplitude modulation by
400 Hz signal
output level: as low as possible
400 Hz signal
output level: as low as possible
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
FM RF SSG
0.01
µ
F
22.5 kHz frequency deviation
by 400 Hz signal.
output level: as low as possible
by 400 Hz signal.
output level: as low as possible
to ANT IN terminal
+
–
–
set
32
Ω
PHONES jack
level meter
+
–
–
digital voltmeter
TP (VT)
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
CFT1
450 kHz
Note: Not use the AM RF signal generator in this confirm.
<
>: Australian model
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
620 kHz
CT2
1,400 kHz
MW FREQUENCY COVERAGE CONFIRM
Confirm for a reading on digital voltmeter.
Confirm
531 kHz
0.85 ± 0.5 V
Confirm
1611 kHz
6.8 ± 1.5 V
Note: Not use the AM RF signal generator in this confirm.
MW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
621 kHz
CT4
1,404 kHz
LW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a reading on digital voltmeter.
Confirm
153 kHz
0.7 ± 0.5 V
L4
279 kHz
7.5 ± 0.2 V
Note: Not use the AM RF signal generator in this adjustment.
LW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L5
162 kHz
CT5
261 kHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a reading on digital voltmeter.
L2
87.5 MHz
1.6 ± 0.4 V
Confirm
108 MHz
6.5 ± 0.5 V
Note: Not use the FM RF signal generator in this adjustment.
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
87.5 MHz
CT1
108 MHz
Adjustment Location: TUNER board (See page 29.)
(D305)
(D305)
(D305L)
(D305L)
(D305L)
(D305L)
(D305)
(D305)
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