Sony CFS-B5L MK2 Service Manual ▷ View online
– 5 –
•
The equipment can be removed using the following procedure.
Set
/
Cabinet (front) sub assy (B)
/
Chassis (TUNE)
/
Tape mechanism block
/
Tuner, AC, Second board
/
Audio, Microphone, ISS board
Note : Follow the disassembly procedure in the numerical order given.
2-1. CABINET (FRONT) SUB ASSY (B)
SECTION 2
DISASSEMBLY
2-2. CHASSIS (TUNE)
2
BVTP 3x12
3
BVTP 3x16
4
BVTP 3x12
5
BVTP 3x12
6
CN912
7
cabinet (front)
sub assy (B)
1
lid, battery case
4
chassis (TUNE)
1
knob (TUNE)
2
knob (FUNCTION)
3
BVTP 3x10
– 6 –
2-3. TAPE MECHANISM BLOCK
2-4. TUNER, AC, SECOND BOARD
1
BVTP 3x10
2
CN301
4
tape mechanism block
3
CN601
2
BVTP 3x10
4
CN1
7
CN901
6
CN911
5
TUNER board
0
AC board
!¡
SECOND board
3
BVTP 3x10
8
BVTP 3x10
9
BVTP 3x10
1
knob (FINE)
– 7 –
2-6. DIAL POINTER SETTING
2-5. AUDIO, MICROPHONE, ISS BOARD
2
knob (TONE)
3
chassis (MD)
9
lever (FUNCTION)
!¡
tapping screw (3x12)
!™
lSS board
4
BVTP 3x10
6
MICROPHONE board
5
SUPPORT board
7
BVTP 3x10
8
AUDIO board
0
CN341
1
knob (VOL)
2
Set the pointer to the
center of scratched lines.
3
Set the chassis (TUNE).
4
BVTP 3x10
1
Turn gear (VC) counterclockwise
to the end.
pointer
– 8 –
0000
2
jack (J301)
digital frequency
counter
counter
set
32
Ω
test tape
WS-48A
(3 kHz, 0 dB)
WS-48A
(3 kHz, 0 dB)
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 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
supply voltage unless otherwise noted.
Torque Measurement
Mode
Torque meter
Meter reading
Forward
CQ-102C
25 – 60 g • cm
(0.35 – 0.83 oz • inch)
Forward
CQ-102C
1 – 5 g • cm
back tension
(0.014 – 0.069 oz • inch)
Fast
CQ-201B
55 – 140 g • cm
Forward
(0.76 – 1.94 oz • inch)
Rewind
CQ-201B
55 – 140 g • cm
(0.76 – 1.94 oz • inch)
Tape Tension Measurement
Mode
Tension meter
Meter reading
Forward
CQ-403A
more than 170 g
(more than 6.00 oz)
SECTION 4
ELECTRICAL ADJUSTMENTS
SECTION 3
MECHANICAL ADJUSTMENTS
4-1. TAPE RECORDER 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
P-4-A063
6.3 kHz, –10 dB
head azimuth adjustment
Tape Speed Adjustment
Procedure:
Mode: playback
Mode: playback
Adjust so that the value on the digital frequency counter is
3,000 Hz.
Specification Value:
Digital frequency counter
2,970 – 3,030 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.
Adjustment Location:
tape speed adjustment
control inside motor
control inside motor
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