Sony PMC-R30L Service Manual ▷ View online
– 9 –
3-6. OPTICAL PICK-UP
3-7. TAPE MECHANISM BLOCK
3
optical pick-up
2
screws (2.6x16)
1
screws (2.6x16)
3
BVTP 3x10
2
BVTP 3x10
4
tape mechanism block
1
Open the cassette lid.
– 10 –
3-8. CONTROL BOARD AND BACK LIGHT BOARD
1
BVTP 3x10
6
BVTP 3x8
5
CNP801
7
BVTP 3x10
8
knob (SNOOZE)
9
BACK LIGHT board
2
BVTP 3x10
4
CONTROL board
3
CNP802
3-9. HOW TO APPLY THE BELTS
2
belt
1
belt
motor assy (M301)
FW assy
idler assy, PF
– 11 –
3-10. HEAD, MAGNETIC (HRP301)
3-11. MOTOR ASSY (M301)
2
screw
1
PTT 2x4
3
head, magnetic (HRP301)
1
spring
2
BVTT 2.6x5
4
PTT 2.6x6
holder, motor
5
motor assy (M301)
3
claw
– 12 –
phones jack (J302)
set
32
Ω
test tape
WS-48A
(3 kHz, 0 dB)
WS-48A
(3 kHz, 0 dB)
digital frequency
counter
counter
TAPE SECTION 0 dB = 0.775 V
• Standard Output Level
Output terminal
HP OUT
load impedance
32 Ω
output signal level
0.25 V (–10 dB)
• Test Tape
Type
Signal
Used for
WS-48A
3 kHz, 0 dB
tape speed adjustment
Tape Speed Adjustment
Procedure:
Mode: playback
Mode: playback
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :
record/playback head
pinch roller
erase head
rubber belts
capstan
idlers
2. Demagnetize the record/playback head with a head demagne-
tizer. (Do not bring the head magnetizer close to the 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
supply voltage unless otherwise noted.
Torque Measurement
Mode
Torque meter
Meter reading
FWD
CQ-102C
30 – 70 g • cm
(0.42 – 0.97 oz • inch)
FWD
CQ-102C
1.5 – 5.5 g • cm
Back Tension
(0.021 – 0.076 oz • inch)
FF
CQ-201B
more than 60 g • cm
(more than 0.83 oz • inch)
REW
CQ-201B
more than 60 g • cm
(more than 0.83 oz • inch)
Tape Tension Measurement
Mode
Tension meter
Meter Reading
FWD
CQ-403A
more than 100 g
(more than 3.53 oz)
SECTION 5
ELECTRICAL ADJUSTMENTS
SECTION 4
MECHANICAL ADJUSTMENTS
Adjust so that the value on the digital frequency counter is
3,000 Hz.
3,000 Hz.
Specification Value:
Digital frequency counter
2,985 to 3,015 Hz
Adjust so that the frequency at the beginning and that at the end of
tape winding are between 2,955 to 3,045 Hz.
tape winding are between 2,955 to 3,045 Hz.
Adjustment Location:
TAPE SPEED
Adjustment
Adjustment
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