Adjustments; Mechanical Adjustments; Electrical Adjustments - Sony CFS-515S Service Manual

4-1. MECHANICAL ADJUSTMENTS

PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :
record/playback head
pinch roller
rubber belt
2. Demagnetize the record/playback head with a head demagne-
tizer. (Do not bring the head demagnetizer close to the erase
head.)
3. Do not use a magnetized screwdriver for adjustments.
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
Torque Torque Meter
Playback CQ-102C
Back Tension CQ-102C
Rewind
CQ-201B
Fast Forward
Tape Tension Measurement
Mode Tension Meter
FWD CQ-403A

4-2. ELECTRICAL ADJUSTMENTS

TAPE SECTION
1. The adjustments should be performed in the order give in the
service manual. (As a general rule, playbak circuit adjustment
should be completed before performing recording circuit adjust-
ment.)
2. The adjustments should be performed for both L-CH and R-CH
unless otherwise indicated.
• Switch location
FUNCTION switch
• • • • • • • • • • • • • • • • •
PRESET MODE
• • • • • • • • • • • • • • • • • • • • •
GRAPHIC EQUALIZER
• • • • • • • •
BALANCE
• • • • • • • • • • • • • • • • • • • • • • • • • • • • •
VOLUME
• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •
MEGA BASS
• • • • • • • • • • • • • • • • • • • • • • • • •
Standard Output Level
Output terminal PHONES
Load impedance 32Ω
Output signal level 0.25V (–10dB)
Test Tape
Type Signal
WS-48A 3kHz, 0dB
0dB=0.775V
SECTION 4

ADJUSTMENTS

playback head
erase head
capstan
Meter Reading
18 – 60 g • cm
(0.25 – 0.83 oz• inch)
1 – 5 g • cm
(0.014 – 0.069 oz• inch)
45 – 95 g • cm
(0.63 – 1.31 oz• inch)
Meter Reading
more than 60g (2.12 oz)
TAPE (RADIO OFF)
MANUAL
center click
center click
MAX
mechanical center
SP (FRONT) OUT
6Ω
0.775V (0dB)
Used for
Tape Speed Adjustment
Tape Speed Adjustment
Procedure :
Mode : Playback
test tape
WS-48A
(3kHz, 0dB)
(Normal speed)
1. Deck A to playback mode.
2. Adjust the RV303 for 2,985 – 3,015Hz reading on digital fre-
quency counter.
3. Frequency difference between the beginning and the end of the
tape should be within 1% (30Hz).
(High speed)
4. Deck B to record mode.
5. Deck A to high speed playback mode.
6. Confirm that the reading of the digital voltmeter becomes 5,500
– 6,500Hz.
7. Frequency difference between the beginning and the end of the
tape should be within 1% (30Hz).
Adjustment Location :
[ MAIN BOARD ]
(Component side)
– 8 –
digital frequency
counter
32 Ω
set
phones jack
RV303 : Tape Speed Adjustment
IC201