Sony TC-K890ES - Calibration and Level Meter Adjustment; Procedure (Oscillation Output Level); Procedure (Level Meter Adjustments)

TC - K222ESA/K890ES |
CALIBRATION and Level Meter Adjustment Procedure (level meter adjustments):
Condition: 1. Recording state (no line input signals)
CALIBRATION switch: ON 2. -Set RV202 rather high and gradually decrease the level.
Set the knob at a point where the level (a) | point higher
Procedure (oscillation output level): than OdB of the LOW FREQ segment (in the lower line)
1. Recording state (no line input signals) in the CAL level meter goes out.
3. Adjust RV102 so that HIGH FREQ segments (in the
upper line) of the CAL level meter light up completely
Unrecorded tape up to the OdB position.
A CN553 CS-222
HIGH: The jevel (a) 1 point higher may also blink.
1GH
REC CAL FREO | em eee a ee ee oe om on on om oe
LOW | op aw on ee ee ow oo om oe
FREO ‘
REC EQ CAL NORM
(a)
LOW: The level (a) 1 point higher should not blink.
2. Adjust RV551 so that the level of the 400Hz check point
becomes 9.5dB - 10.5dB.
3. Adjust RV552 so that the level of the 8kHz check point
becomes 9.5dB - 10.5dB.
Adjustment Location: |
Main (A) PCB ~— Component side —
METAL bias adjustment Playback level adjustment
Hh Level meter adjustment
RV101
IC502
LO RV202@) nee
RV201 Oscillation output level
“a adjustment
Torque
=
=
adjustment RV801 RV551 @) G) RV552
i
400Hz
8kHz
Bias consumption
( RV554 ~— current adjustment
LPF301
ee env aee Cr] RV301
iC801 Y) GC
T301
1C554 IC552
Bias adjustment, 7 RV403 © arv4o2 wot
mA [Q] 1551 fe
Bias adjustment LG) RV553 BAO
/
Erase current adjustment Recording level adjustment