DV-RW360H (serv.man4). Pages 1-7-1 to 1-14-7 - Sharp DVD Service Manual (repair manual). Page 7

1-9-1

E9B30EA

1. Electrical adjustments are required after replacing

circuit components and certain mechanical parts. It
is important to do these adjustments only after all
repairs and replacements have been completed.
Also, do not attempt these adjustments unless the
proper equipment is available.

2. To perform these alignment / confirmation proce-

dures, make sure that the tracking control is set in
the center position: Press either [PROGRAMME 

o

]

or [PROGRAMME 

p

] button on the front panel first,

then the [VCR PLAY] button on the front panel.

1. Oscilloscope: Dual-trace with 10:1 probe,

V-Range: 0.001~50V/Div.,

F-Range: DC~AC-20MHz

2. Alignment Tape (9HSFL6A) (Refer to "SERVICE

FIXTURE AND TOOLS" section.)

To determine the Head Switching position during
playback.

May cause Head Switching noise or vertical jitter in
the picture.

J236(JK1-V-OUT)

TP504(RF-SW)

GND

VR501

(Switching Point)

(MAIN CBA)

9HSFL6A

Oscilloscope

Oscilloscope

Main CBA

CH1   CH2
    Trig. (+)

GND

TP504

J236

PLAY

(SP)

-----

(416 S

64 S)

6.5H   1H

EXT. Syncronize Trigger Point

1.0H

CH1

CH2

Switching Pulse

V-Sync

0.5H

6.5H

±1H (416µs±64µs)

Playback the Alignment tape and adjust VR501 so that
the V-sync front edge of the CH1 video output waveform
is at the 6.5H±1H (416µs±64µs) delayed position from
the rising edge of the CH2 head switching pulse waveform.