1-10
8. ELECTRICAL ADJUSTMENT
8-1. DVD JITTER ADJUSTMENT
1. Stick the provided small round sticker (0.1 mm thickness) at
the innermost position of a DVD disc as shown and make a
swayed DVD disc.
Fig. 8-2
2. Play back the swayed DVD disc and press the F.F button
repeatedly until the pickup block reaches the outermost
position of its movable range. Next, press the PAUSE button.
3. Set the oscilloscope to the DC input mode and connect it to
the TP201 (HOT) and the TP102 (D.GND) on the MAIN
PCB.
4. Adjust the a screw and b screw alternately so that the AC
and DC level of the waveform is minimum. (DC level should
be less than 1.8 V, AC component should be minimum.)
Fig. 8-3
NOTE: If the SPINDLE MOTOR is replaced, this jitter
adjustment should be performed for proper performance.
8-2. SLICE LEVEL ADJUSTMENT
1. Play back an ordinary DVD disc (single side, one layer) and
press the F.F button repeatedly until the pickup block reaches
almost the center position of its movable range.
2. Set the oscilloscope to the DC input mode and connect it to
the TP201 (HOT) and the TP102 (D.GND) on the MAIN
PCB.
3. Adjust the VR202 so that the DC level is minimum. (The DC
level should be less than 1.8 V)
8-3. CD TRACKING BALANCE
1. Set the VR110 at its center position prior to the adjustment.
2. Connect an oscilloscope to the TP150 (TE) on the MAIN
PCB.
3. Play back an ordinary CD-disc and then set it to the PAUSE
mode. If the play mode does not be engage, turn the VR110
at ±15 degrees. If the play mode does still not be engage
even when the VR110 is turned at ±15 degrees, turn the
VR110 at ± 30 degrees and try it again.
4. Observe the waveform and adjust it so that the level A of the
waveform is the same as level B.
Fig. 8-4
Fig. 8-1
TP107
TP105
P800
TP300
VR120
VR121
TP120
VR110
VR202
P807
TP201
P804
P803
JITTER ADJ
SCREW B
JITTER ADJ
SCREW A
Signal recorded side
STICKER
Less than 1.8V
minimum
A
B
500mV
Summary of Contents for DV7000
Page 15: ...1 13 1 14 1 10 WARNINGS ...
Page 16: ...1 15 1 16 1 11 BLOCK DIAGRAM ...
Page 17: ...1 17 1 18 1 12 SCHEMATIC DIAGRAM AND PARTS LOCATION ...
Page 18: ...1 19 1 20 ...
Page 21: ...1 25 1 26 ...
Page 36: ......
Page 37: ...2 1 2 2 Not for DV4000 2 1 SCHEMATIC DIAGRAM AND PARTS LOCATION ...
Page 38: ...2 3 2 4 ...
Page 39: ...2 5 2 6 Not for DV4000 ...
Page 42: ...2 11 2 12 ...
Page 48: ...2 20 MN66261 CD signal processing ...
Page 49: ...2 21 MN66261 CD signal processing ...
Page 50: ...2 22 MN67700 Servo processing IC ...
Page 51: ...2 23 MN67700 Servo processing IC ...
Page 56: ...2 28 2 3 EXPLODED VIEW AND PARTS LIST TKM1000MZ ...
