Hitachi DV-RF7U Service Manual page 66

Dvd video recorder with video cassette recorder

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Adjustment > VCR Mechanism Adjustment

d. ACE Head Position (X-Value) Adjustment

1) Play back the alignment tape (Color bar section).

2) Intermittently short-circuit the two Test Points on VCR Main P.C.B while in the adjustment

mode. Check that "TEST" appears in the display.

3) While "TEST" is being displayed, press the [0], [5] buttons on remote control, and the adjustment

will operate automatically.

4) Connect the oscilloscope CH-1 probe to TP3 (ENVELOPE) and CH-2 probe to TP4 (Head S/W-

Trigger), and then trigger the oscilloscope from CH-2.

5) Slightly loosen the X-value securing screw (do not excessively loosen).

6) Insert a flat-bladed screwdriver into the groove for X-value adjustment, and then adjust the X-

value to maximize the CH-1 FM output.

7) Tighten the X-value securing screw.

8) Turn power off to release the adjustment mode.

Fig. 5-3-6 Locations of Test points (VCR Main P.C.B-Top View)

(See Fig.5-2-2)

(See Fig. 5-2-1)

Test point:

TP2 (Audio Output)

TP3 (Envelope)

TP4 (Head S/W-Trigger)

TP5 (Control Pulse)

5 - 7

(See Fig. 5-3-3)

CONTROL PULSE

HEAD SWITCHING

ENVELOPE

AUDIO OUTPUT

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