Sharp XL-505H Service Manual page 10

XL-505H,505E,507E/CP-505,505E,507
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. 10-1) 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. 10-2)
Focus Gain Adjustment is performed when disc is changed.
2-2: Tracking Servo Gain (Fig. 10-3)
Tracking Gain Adjustment is performed when disc is changed and disc is playbacked.
VRO
Figure 10-1
TSO
TS2O
Figure 10-3
Adjustment Part
VR803 (Focus Offset)
VR802 (Tracking Error Balance)
1
VR802
TRACKING
ERROR
BALANCE
Figure 10-4 ADJUSTMENT POINTS
Value/Adjusting Method
DC + 40 mV (FEL>RFO)
*1 (See Fig. 10-1)
TSO
FET
SYMMETRICAL
UP AND DOWN
FSO
1
2
CD SERVO PWB
VR803
TP801
321
3 2 1
FOCUS
OFFSET T
N
S
C
O
– 10 –
Instrument Connection
FEI (R826) and VRO
(1-Pin of TP801)
TSO (3-Pin of TP801)
and VRO (1 Pin of TP801)
Figure 10-2
V
R
O
1
2