Sharp XL-520W Service Manual page 10

XL-520W/CP-520
CD SECTION
1. This CD unit need adjustment as follow.
CD Test Mode
Step 1
Step 4
*1: Adjust to obtaiin vertically symmetrical waveform (Fig. 10-2) with respect toreference DC level. The reference level is VRO
(Approx DC 2.1V).
2. This CD unit have the following automatic adjustment function. Automatic adjustment item.
2-1: Focus Servo Gain (Fig. 10-3)
Focus Gain Adjustment is performed when disc is changed.
2-2: Tracking Servo Gain (Fig. 10-4)
Tracking Gain Adjustment is performed when disc is changed and disc is playbacked.
VRO
Figure 10-2
TSO
TS2O
Figure 10-4
Adjustment Part
VR803 (Focus Offset)
VR802 (Tracking Error Balance)
VR802
TRACKING
ERROR
BALANCE
Figure 10-1 ADJUSTMENT POINTS
TSO
SYMMETRICAL
1
UP AND DOWN
1
2
Value/Adjusting Method
DC + 40 mV (FEI>VRO)
*1 (See Fig. 9-2)
CD SERVO PWB
VR803
321
TP801
321
FOCUS
OFFSET T V
N
S R
C
O O
FEI
FSO
– 10 –
Instrument Connection
FEI (R826) and VRO
(1-Pin of TP801)
TSO (3-Pin of TP801)
and VRO (1 Pin of TP801)
Figure 10-3
1
2