Mechanical Adjustments - Sony HCD-F250AV Service Manual

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• TAPE MECHANISM DECK SECTION
Precaution
1. Clean the following parts with a denatured alcohol-moistened
swab:
record/playback heads
erase head
capstan
2. Demagnetize the record/playback head with a head
demagnetizer.
3. Do not use a magnetized screwdriver for the adjustments.
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.
• CD MECHANISM DECK SECTION
To adjust the mechanism section, enter the mechanism section adjustment mode.
For how to enter the mechanism section adjustment mode, refer to each adjustment section.
DISC SENSOR ALIGMENT
1. Make sure that there is no disc in the unit.
2. Connect an oscilloscope to IC401$™, IC4024 of the MAIN board.
TE
L 13942296513
IC401 $™ D.SENS (CH1)
IC401 4 HHOUT (CH2)
GND
3. Turn the power switch on.
4. Press the p button, ENTER button and GROUP 5 button simultaneously.
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SECTION 4
MECHANICAL ADJUSTMENT
pinch rollers
rubber belts
idlers
oscilloscope
x ao
y
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8
• Torque Measurement
Mode
FWD
FWD
back tension
REV
REV
back tension
FF/REW
FWD tension
REV tension
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— 18 —
2 9 9 4 2 8
Torque meter Meter reading
31 to 71 g • cm
CQ-102C
(0.43 – 0.98 oz • inch)
2 to 6 g • cm
CQ-102C
(0.02 – 0.08 oz • inch)
31 to 71 g • cm
CQ-102RC
(0.43 – 0.98 oz • inch)
2 to 6 g • cm
CQ-102RC
(0.02 – 0.08 oz • inch)
71 to 143 g • cm
CQ-201B
(0.98 – 1.99 oz • inch)
100 g or more
CQ-403A
(3.53 oz or more)
100 g or more
CQ-403R
(3.53 oz or more)
1 5 0 5 8 2 9 9 4
m
co
9 9
2 8 9 9