Sony M-450 - 3 Adjustments; Mechanical Adjustments; Electrical Adjustments

7
M-450/455
3-2. ELECTRICAL ADJUSTMENTS
Standard Output Level
Output terminal EAR
Load impedance 8Ω
Output level 78mV (– 20dB)
Test Tape
Type Signal Used for
Tape speed
(cm/s)
S-2-A030A 3kHz, –20dB Azimuth Adjustment 2.4
WS-24
3kHz, –10dB Tape Speed Adjustment
2.4
WS-12 1.2
PRECAUTION
Record/Playback/Erase Head Azimuth Adjustment
Switch position
VOLUME : Mechanical center
TAPE SPEED switch : 2.4cm/s
VOR switch : OFF
Procedure :
– FWD/REV playback –
set
test tape
S-2-A030A
(3kHz, –20dB)
level mete
r
earphone jack
8
Ω
r
Rotate the screw to adjust level meter reading to the maximum.
Note : Adjust to the maximum peak though there may be two or
three peaks
Adjustment Location :
3-1. MECHANICAL ADJUSTMENTS
PRECAUTION
1. Before adjusting, clean the following parts with a piece of cot-
ton moistened with alcohol.
record/playback/erase head pinch roller
rubber belt capstan
2. Demagnetize the record/playback/erase head using a head de-
magnetizer.
3. Do not use a magnetized screwdriver for adjustments.
4. After adjusting, apply screw-locking compound to the adjusted
parts.
5. Unless specified otherwise, use a specified voltage (3V DC) to
perform the adjustments.
Torque Measurement
Tape Speed switch : 2.4cm/s
Mode Torque Meter Meter Reading
Forward CQ-103M
0.5 –0.98mN • m
(5 – 10 g • cm)
(0.07 to 0.138 oz• inch)
Fast Forward CQ-201M
0.5 –0.98mN • m
(5 – 10 g • cm)
(0.07 to 0.138 oz• inch)
Tape Tension Measurement
Tape Speed switch : 2.4cm/s
Mode Torque Meter Meter Reading
FWD CQ-403M
more than 25 g
(more than 0.9 oz)
SECTION 3
ADJUSTMENTS
0db=0.775V
head azimuth
adjutment scre
w