Read Sony PMC-D407L Service Manual online
– 12 –
Tape Speed Adjustment
Procedure:
Mode: playback
Mode: playback
32
Ω
test tape
WS-48B
(3 kHz, 0 dB)
WS-48B
(3 kHz, 0 dB)
set
2
(headphones) jack
digital frequency
counter
counter
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)
Adjust so that the frequency at the beginning and that at the end of
tape winding are between 2,970 and 3,030 Hz.
tape winding are between 2,970 and 3,030 Hz.
Adjustment Location:
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
Adjust so that the value on the frequency counter is 3 kHz.
Specification Values:
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