MD-R3H
– 16 –
Figure 16-2 FOCUS OFFSET/TRACKING OFFSET
Figure 16-3 FOCUS OFFSET/TRACKING OFFSET
Figure 16-1 TRACKING ERROR BALANCE
Figure 16-6 ADJUSTMENT POINTS
Figure 16-4 LOW-PASS FILTER
Figure 16-5 TRACKING GAIN RELAY CIRCUIT
Vertically
symmetrical
waveform
0.5~1.5Vp - p
Reference
CD level
1/2 VCC
Apply a black tape
(1.2 to 1.5 wide).
It is allowed use any disc in addition
to test disc.
Do not apply the black tape to the
initialization part (TOC).
Adjust to get uniform and minimized
error waveform.
27k
Ω
FG1
TP751, pin 1
TG1
TP751, pin 4
Waveform
observation
point
820P
1/2 VCC
TP751,
pin 4
(TG1)
TP751,
pin 6
(1/2Vcc)
TP751,
pin 2
(TG2)
0.0082
0.0082
100K
100K
100K
100K
2.2K
2.2K
820P
820P
CH - 1
CH - 2
VV
VV
Signal
transmitter
1
FG1
2
FG2
3
HF
4
TG1
5
FG2
6
1/2Vcc
CNS903
VR752
VR751
VR753
VR754
1
6
TP751
TP751
CNP700A
For your safety do not attempt to adjust
the half-fixed resistor for laser power
adjustment.
OPTICAL PICKUP PWB
TRACKING
ERROR BALANCE
TRACKING
OFFSET
TRACKING
GAIN
FOCUS
OFFSET
CD SERVO PWB
Do not plug in or unplug the optical pickup
connection cable while power is on.
Otherwise damage may occur.