Sony CFD-980 Service Manual ▷ View online
— 13 —
Front cabinet sub assy
4
POWER SW board
7
H/P board
1
CN317
5
CN303
2
Screw
(+BVTP 2.6
×
10)
6
Screw
(2.6
×
10 +PWH)
3
POWER BRACKET board
3-5.
CONTROL PANEL / SW BOARD
3-6.
POWER SW BOARD / H/P BOARD
Upper cabinet assy
3
Screws 8pcs
5
SW1 board
4
CN310
1
Screws 4pcs
(+BVTP 3
×
12)
2
Panel subassy, control
— 14 —
Upper Cabinet
4
Screws 3psc
(+BV 3
×
8)
5
SW2 board
3
Optical-pick up section
2
Screws 4pcs
(2.6
×
10 +PWH)
1
Spring, tension
(Remove adhesive agent.)
1
Open the cassette lid.
Upper cabinet
3
Mechanism deck
2
Screws 4pcs
(+BV 3
×
10)
4
Screws 4pcs
(+P 2
×
6 Type2)
5
REC board
3-7.
OPTICAL PICK-UP (KSM-213CAM) SECTION / SW2 BOARD
3-8.
REC BOARD / MECHANISM DECK (MF-980-146) SECTION
— 15 —
SECTION 4
ADJUSTMENTS
Torque Meter
CQ-403A
Meter Reading
more than 80g
(more than 2.83 oz)
4-2.
ELECTRICAL ADJUSTMENT
Standard output level
Test tape
Tape Speed Adjustment
Procedure :
Mode : Playback
Mode : Playback
Adjustment Value : normal tape speed
Frequency difference between the beginning and the end of the
tape should be within 3% (90Hz).
tape should be within 3% (90Hz).
Adjustment Location :
HP OUT
32
Ω
0.25 V (–10dB)
Output Pin
Load impedance
Output signal level
Test Tape
WS-48A
P-4-A063
Used for
Tape speed adjustment
Head azimuth adjustment.
Signal
3kHz, 0dB
6.3kHz, –10dB
4-1.
MECHANICAL ADJUSTMENT
PRECAUTION
1.
Clean the following parts with a denatured-alchool-moistened
swab:
swab:
record/playback head
pinch roller
erase head
rubber belts
capstans
2.
Demagnetize the record/playback head with a head
demagnetizer. (Do not bring the head demagnetizer close to
the erase head.)
demagnetizer. (Do not bring the head demagnetizer 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
parts adjusted.
parts adjusted.
Torque Measurement
Tape Tension Measurement
Meter Reading
60g
•
cm
(0.42 – 0. 83 oz
•
inch)
1 – 5g
•
cm
(0.014 – 0.07 oz
•
inch)
more than 55g
•
cm
(more than 0.77 oz
•
inch)
more than 55g
•
cm
(more than 0.77 oz
•
inch)
Mode
FWD
FWD
back tension
Fast Forward
Rewind
Torque Meter
CQ-102C
CQ-201B
1dB = 0.775V
32
Ω
test tape
WS-48A
(3kHz, 0dB)
WS-48A
(3kHz, 0dB)
set
speed checker
LFM-30 or
digital frequency
counter
LFM-30 or
digital frequency
counter
J302 (phones)
+
–
Digital frequency counter
2,910 – 3,090Hz
Speed checker
–3.0 to 3.0%
TAPE RECODER SECTION
Tape speed adjustment
control inside motor
control inside motor
— 16 —
Record/Playback Head Azimuth Adjustment
Procedure:
1.
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 2dB.
these levels do not match, turn the adjustment screw until both
of output levels match together within 2dB.
32k
Ω
test tape
P-4-A063
(6.3kHz, –10dB)
P-4-A063
(6.3kHz, –10dB)
set
+
–
level meter
J302 (phones)
V
H
oscilloscope
J302 (phones)
test tape
P-4-A063
(6.3kHz, –10dB)
P-4-A063
(6.3kHz, –10dB)
set
L-CH
L-CH
32
32
Ω
32
Ω
R-CH
R-CH
screen pattern
in phase
45
°
90
°
135
°
180
°
good
wrong
3.
Phase Check
Mode : Playback
Mode : Playback
Note:
Adjustment must be completed by cw turning of adjustment
screw.
After the adjustment, lock the screws with locking
compound.
screw.
After the adjustment, lock the screws with locking
compound.
Adjustment Location : Record/Playback head
screw position
L-CH
peak
peak
R-CH
peak
peak
R-CH
peak
peak
L-CH
peak
peak
Screw
position
position
output
level
level
within
2dB
2dB
within
2dB
2dB
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