Sony M-98V, Service Manual, Page: 8 / 30

– 8 –
REV side
adjustment screws
FWD side
test tape
S-2-A030
(3 kHz, –20 dB)
10 k Ω
set
EAR jack (J102)
level meter
PRECAUTION
1. Before adjusting, clean the following parts with a piece of
cotton moistened with alcohol.
record/playback/erase head pinch roller
rubber belt capstan
2. Demagnetize the record/playback/erase head using a head
demagnetizer. (Do not bring the head demagnetizer close to the
erase head.)
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 (2.5 V DC)
to perform the adjustments.
Torque Measurement
TAPE SPEED switch : 2.4cm/s
Mode Torque Meter Meter Reading
5 – 10 g • cm
FWD, REV CQ-103M
(0.07 – 0.13 oz • inch)
more than 15 g • cm
FF, REW CQ-201M
(more than 0.209 oz • inch)
Tape Tension Measurement
TAPE SPEED switch : 2.4cm/s
Mode Torque Meter Meter Reading
more than 15 g
FWD CQ-403M
(more than 0.53 oz)
SECTION 4
MECHANICAL ADJUSTMENTS
SECTION 5
ELECTRICAL ADJUSTMENTS
Standard Input Level
Input terminal MIC (PLUG IN POWER) jack
Source impedance 300 Ω
Input level 0.77 mV (–60 dB)
Frequency 1 kHz
Standard Output Level
Output terminal EAR jack
Load impedance 10 k
Ω
Output level 78 mV (–20 dB)
Test Tape
Type Signal User for
S-2-A030 3 kHz, –20 dB Azimuth Adjustment
WS-24 3 kHz, –10 dB Tape Speed Adjustment
0 dB = 0.775 V
PRECAUTION
• Switch and control position
VOL control : 5 (Mechanical center)
TAPE SPEED switch : 2.4cm/s
V•O•R switch
: OFF
FAST PB switch : OFF
MIC SENS switch : H
Record/Playback/Erase Head Azimuth Adjustment
Procedure :
– FWD/REV playback –
• 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 :