Sony M-98V Service Manual page 9

Tape Speed Adjustment
Procedure :
After adjusting the 2.4cm/s speed, adjust the 1.2cm/s speed.
– FWD/REV playback –
test tape
WS-24
(3 kHz, –10 dB)
set
1. Tape Speed : 2.4cm/s/FWD
Playback WS-24 (tape center part) and adjust RV601 so that
reading on the digital frequency counter becomes 3,000 Hz.
2. Tape Speed : 1.2cm/s/FWD
Playback WS-24 (tape center part) and adjust RV601 so that
reading on the digital frequency counter becomes 1,500 Hz.
Specification Value :
Adjustment part Tape speed
RV601 2.4cm/s
RV602 1.2cm/s
3. Tape Speed : 2.4cm/s/REV
Playback WS-24 (tape center part) in the REV state.
Check that digital frequency counter reading is within ± 2% of
reading of step 1.
4. Tape Speed : 1.2cm/s/REV
Playback WS-24 (tape center part) in the REV state.
Check that digital frequency counter reading is within ± 2% of
reading of step 2.
2.4cm/s : 60 Hz
1.2cm/s : 30 Hz
Adjustment Location : main board
– MAIN BOARD (SIDE B) –
digital frequency
counter
0000
10 k Ω
EAR jack (J102)
Frequency counter
2,985 – 3,045 Hz
1,470 – 1,530 Hz
IC601
RV602 1.2cm/s
RV601 2.4cm/s
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