Sony TC-KA6ES Service Manual page 11

Record/Playback Head Azimuth Adjustment
Procedure :
1. Mode : FWD playback
Test tape
P-4-A100
(10kHz, —10dB)
LINE OUT
2. Turn the adjustment screw for the maximum output levels.
If these levels do not match, turn the adjustment screw unitil
1dB within idB
R-CH
Screw Peak
position
3. Phase Check
Mode : playback
—- angle
L-CH peak R-CH peak
Test tape
P-4-A100
R-CH
LINE OUT
4. Confirm that the phase difference between L-CH and R-CH
is in-phase to 90°.
Oscilloscope Lissajous' Figures
QOAO@O
in-phase 45° gd° 135° 180°
orn Wy
good No good
Adjustment Location :
Adjusting screw
Playback Level Adjustment
Procedure :
1. Mode : Playback
Test tape
P-4-L300
(315Hz, 0dB)
LINE OUT
2. Adjust the RV101 (L-CH) and RV201 (R-CH) to satisfy the
following specification.
Adjustment Value :
LINE OUT level : 0.3 to 0.34V (8.2 to —7.2dB)
Level difference between channels : within 0.5dB
Confirm that the LINE OUT level does not change when
playback and stop are repeated.
Erase Current Adjustment
Procedure :
1. Mode : record
Blank tape
CS-413
VTVM TP502
Frequency counter
2. Adjust RV506 so that VTVM reading is 110mV (erase
current 110mA).
3. At this time, confirm oscillation frequency.
Adjustment Value :
Erase current : 110+2 mA
Oscillation frequency : 160 + 6kHz