Tracking Offset Adjustment - C.E.C. CH3000 Service Manual

CD PLAYER ADJUSTMENT PROCEDURES (continued)
TRACKING OFFSET ADJUSTMENT
1. Push the POWER button to switch the power on and push
the STOP button.
2. Connect a DC Voltmeter to the test terminal TC (tracking
coil) and short the test terminal TROF to GND.
3. In this condition check that the DC Voltmeter indicator is
in the range 100mV+20mV, and adjust P102 if it is not.
NOTE:
Perform this adjustment once again after adjusting the
E/F BALANCE and TRACKING GAIN signals.
TURNTABLE HEIGHT ADJUSTMENT
This adjustment must be performed when the Spindle Motor
is replaced.
1. The turntable should be mounted so that its upper surface
is 15.85mm+0.1mm above the surface of the chassis.
Turntable
15.85mm
Chassis
| ss
Motor
nN Place the test disc (Modern Wave II) on the turntable.
3. Connect a DC Voltmeter and an oscilloscope via the low-
pass filter shown below to test terminal FC.
22K
220/63
DC Voltmeter
and
GNO
Measurement Circuit
4. Push the POWER button to switch the power on and PLAY
the First and Last Track No. on the disc.
5. {f the DC Voltmeter reading is not in the ranges 0V+0.2V
for inner tracks and 0V+0.35V for outer tracks, then the
turntable height must be readjusted. Raise the turntable
higher if the OC Voltmeter indicator is on the plus (+)
side, and lower it if it is on the minus {—) side.
(With this circuit 1V represents movement of approxi-
mately 0.55mm ~ 0.65mm.)