Marantz DV7000 Service Manual download pdf (Page 12)

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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

500mV

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Marantz DV7000 Service Manual Page 12

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