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5. Alignment and Adjustment
5-1 Mechanical Adjustment
Reference : For other mechanical adjustments except A/C Head position (X-point) adjustment, refer to the mechanical manual (DX7-R/DX7-RC/DX8-R/DX8-RC, AC68-20316A). Test point : TP05 (Envelope) TP04 (H'D S/W -Trigger) TP03 (CTL Pulse) TP06 (Audio out) Test tape : PAL Color bar Mono scope Blank tape (E-240)

5-1-1 A/C Head Point (X-point) Adjustment
1. Playback the mono scope alignment tape. 2. Connect CH-1 scope probe to TP03 and CH-2 scope probe to TP04. And then, trigger head switching pulse. 3. Set tracking preset to 1msec using the ÒTrackingÓ button / of remote control. (Refer to Fig. 1 and 2) 4. Connect CH-1 scope probe to TP05 and the CH-2 to ÒHÕD S/WÓ trigger on CH-1. 5. Insert the adjusting driver(+) into X-point adjusting gear. Adjust the driver in either direction for maximum envelope waveform. Note : Since the adjusting gear unit may be damaged, do not adjust by force when adjusting the X-point using the adjusting driver(+). After turn the X-point adjusting screw(D) counterclockwise a little, perform the adjustment. After adjustment is completed, tighten the screw. (Refer to Fig. 3) - Volt/div. : CH-1 = 0.1V CH-2 = 0.2V CH-2 Probe TP04 H'D S/W Pulse CH-1 Probe TP03 CTL Pulse - Time/div. : 5msec REMOTE BUTTONS
PUSH

CONTROL PULSE REMOVE

TRACKING

TRACKING 1msec
PUSH

Fig. 5-1 Tracking preset adjustment Fig. 5-2 Control pulse adjustment
TP4 : HEAD S/W-TRIGGER SCREW(B) AZIMUTH ADJUST SCREW(C) TILT ADJUST

TP3 : CTL PULSE

X-POSITION ADJUST GEAR HOLE

TP5 : ENVELOPE TP6 : AUDIO OUT SCREW(A) HEIGHT ADJUST

SCREW(D) X-POINT LOCKING

Fig. 5-3 PCB Layout Samsung Electronics

Fig. 5-4 Location of A/C Head adjustment screw 5-1

Alignment and Adjustment

5-2 Electrical Adjustment
Step Adjustment Item
ADJ. point

1. Mode and input signal/ alignment tape 2. Test point and ADJ. part 3. Result and Remarks

5-2-1 Head switching point
1. ÒPBÓ, Alignment tape color bars. 2. TP4 (HÕD S/W), TP7(Video out) and VR601. 3. Connect an oscilloscopeÕs CH-1 to TP4 for triggering and CH-2 to TP7. 4. Adjust VR601 so that the head switching point is positioned 6.5 ± 0.5H from the V-SYNC left edge as shown.
SW25HZ PULSE CH-2 CH-1 SWITCHING POINT

Test

poin

t

VIDEO OUT

6.5H

0.5H

(Main PCB - Component Side) 5-2 Samsung Electronics

Alignment and Adjustment

5-3 Timing Chart of Program S/W

SW A (IC601-16) SW B (IC601-17) END -SENSOR (IC601-38) START -SENSOR (IC601-6)

CASS IN EJECT UNLOAD RPS R.SLW STILL PB STOP F/R

POSITION EJECT CASSETTE IN UNLOAD R. PS R. SLOW STILL PLAY STOP FF/REW

PROGRAM S/W (SW601) E/S L H L H H L H L L H L H L H S/S L H SW A L L L H H L L H L H L SW B L L H EJECT

ACTION MODE

CASSETTE IN UNLOAD R. PS, Z-R. PS PINCH ROLLER OFF POSITION STILL PB, T-STOP, REC, PAUSE, F. PS, Z-FPS STOP, POWER OFF FF, REW

Samsung Electronics

5-3

Alignment and Adjustment

MEMO

5-4

Samsung Electronics