Sony PMC-222V Service Manual ▷ View online
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— 18 —
— 19 —
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SECTION 2
DISASSEMBLY
Note :
Follow the disassembly procedure in the numerical order given.
2-1. FRONT CABINET ASSY
2-2. CD BLOCK ASSY
2-3. MECHANISM DECK BLOCK ASSY
2-4. CHUCKING PLATE
2-5. CD DOOR ASSY, CD BOARD, OPTICAL PICK-UP SECTION
2
two screws
(BVTP 3
×
10)
2
four screws
(BVTP 3
×
10)
2
two screws
(BVTP 3
×
10)
4
four screws
(K 3
×
10)
!™
three screws
(KTP 3
×
10)
6
four screws
(K 3
×
10)
6
screws
(WH 3
×
8)
7
side panel (L)
3
rear cabinet
5
side panel (R)
9
connector
(CNP302)
8
connector
(J003)
4
connector
(CNP1004)
7
Video jack board
9
parallel wire (FFC)
(23 core) (CNP310)
8
parallel wire (FFC)
(15 core) (P1001)
!¡
connector
(CNP312)
!£
two claws
!¢
front cabinet
assy
1
EQ knob
!º
connector
(CNP304)
!∞
connector
(CNP704)
5
screws
(BVTP 3
×
10)
Note:
4 – 7 ; Video jack board removal.
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SECTION 3
MECHANICAL ADJUSTMENTS
1. The sdjustments 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
adjustment.)
should be completed before performing recording circuit
adjustment.)
2. The adjustments should be performed for both L-ch and R-ch
unless otherwise indicated.
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 1% (30Hz).
should be within 1% (30Hz).
Adjustment Location :
Test Tape
WS-48A
P-4-A063
Used for
Tape speed adjustment
Head azimuth adjustment.
Signal
3kHz, 0dB
6.3kHz, –10dB
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.)
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.
Torque Measurement
Tape Tension Measurement
Meter Reading
30 – 80g
•
cm
(0.42 – 1.12 oz
•
inch)
1.5 – 5.5g
•
cm
(0.021 – 0.07 oz
•
inch)
50 – 130g
•
cm
(0.77 – 1.80 oz
•
inch)
50 – 130g
•
cm
(0.77 – 1.80 oz
•
inch)
Mode
FWD
FWD
back tension
Fast Forward
Rewind
Torque Meter
CQ-102C
CQ-201B
1dB = 0.775V
Digital frequency counter
2,970 – 3,030Hz
Speed checker
–1.0 to 1.0%
TAPE RECODER SECTION
HP OUT
32
Ω
0.25 V (–10dB)
Output Pin
Load impedance
Output signal level
SP OUT
6
Ω
0.775 V (0dB)
32
Ω
test tape
WS-48A
(3kHz, 0dB)
WS-48A
(3kHz, 0dB)
set
digital frequency
counter
counter
J303 (phones)
+
–
Torque Meter
CQ-403A
Meter Reading
more than 100g
(more than 3.53 oz)
MODE
FWD
SECTION 4
ELECTRICAL ADJUSTMENTS
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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 1dB.
these levels do not match, turn the adjustment screw until both
of output levels match together within 1dB.
3.
Phase Check
Mode : Playback
Mode : Playback
Note:
Adjustment must be completed by clockwise turning of
adjustment screw.
After the adjustment, lock the screws with locking
compound.
adjustment screw.
After the adjustment, lock the screws with locking
compound.
Adjustment Location : Record/Playback head
•
Remove the cassette door.
32
Ω
test tape
P-4-A063
(6.3kHz, –10dB)
P-4-A063
(6.3kHz, –10dB)
set
+
–
level meter
J303 (phones)
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
1dB
1dB
within
1dB
1dB
test tape
P-4-A063
(6.3kHz, –10dB)
P-4-A063
(6.3kHz, –10dB)
set
L-CH
32
32
Ω
32
Ω
R-CH
L-CH
R-CH
J303 (phones)
oscilloscope
V
H
screen pattern
in phase
45
°
90
°
135
°
180
°
good
wrong
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