Sony RDR-VX521 Service Manual page 93

d. ACE HEAD POSITION (X-POINT) ADJUSTMENT
1) Playback the alignment tape (Color bar)
2) Intermittently short-circuit the two Test Points on Function Timer PCB. (See Fig. 6-2)
3) Press the "0, 5" remote control buttons, then adjustment is operates automatically. (See Fig. 6-1)
4) Connect the CH-1 probe to "Envelope" the CH-2 probe to "H'D switching pulse" and then trigger to CH-1.
5) Insert the (-) driver into the X-Point adjustment hole and adjust it so that envelope waveform is maximum.
Test point: TP2 (Audio Output)
TP3 (Envelope)
TP4 (H'D S/W -Trigger)
TP5 (Control Pulse)
iew)
CONTROL PULSE
HEAD SWITCHING
ENVELOPE
AUDIO OUTPUT
Fig. 6-8 Location of Test point (VCR Main PCB-Top View)
6-7