Sony TC-K808ES - Record;Playback Head Azimuth Adjustment; Playback Level Adjustment; Erase Current Adjustment

Record/Playback Head Azimuth Adjustment
Procedure:
1. Mode : FWD playback
Test tape
P-4-A100 VTVM
(10kHz, —10dB)
LINE OUT
2. Turn the adjustment screw for the maximum output levels. If these
levels do not match, turn the adjustment screw until both of output
levels match together within 1dB.
L-CH
peak
within
10B
R-CH
Screw Peak
we ——~ angle
position
L-CH peak R-CH peak
3. Phase Check
Mode: playback
Test tape
P-4-A100
(10kHz, —10dB)
ill
ae 47kO Oscilloscope
LINE OUT
4. Confirm that the phase difference between L-CH and R-CH is
in-phase to 90°.
Oscilloscope Lissajous’ Figures
QOOAOQOO
eT
good no good
in-phase 45° go° 135° = 180°
— J
Adjustment Location:
Adjusting screw
Playback Level Adjustment
Procedure:
1. Mode: playback
Test tape
P-4-L300
(315Hz, OdB)
LINE OUT
2. Adjust the RV101 (L-CH) and RV201 (R-CH) to satisfy the
following specification.
Adjustment Value:
LINE OUT level : 302 — 338mV
(-—8.2 — —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
F
VTVM
TP503
requency
counter
CS-413
2. Adjust RV506 so that VTVM reading is 110mV (erase current
110mA).
3. At this time, confirm oscillation frequency.
Adjustment Value:
Erase current: 11072mA
Oscillation frequency: 160+6kHz