Akai VS-X9EGN

IX. ELECTRICAL ADJUSTMENT
9-1. MAIN PCB ADJUSTMENT
Precautionary items prior to adjustments
1. The color bar generator output should be 1.0 Vp-p.
2. Video output terminal should be terminated with 75 ohms (dummy or load).
SERVO ADJUSTMENT
TRACKING PRESET
: de test tape TF-530RFS (TF-508RF) on the “PAL B/G”
mode.
2. Test terminal P102 Pin @) (CTL PULSE), pin @ (V-SYNC)
&VR4.
3. Set the TRACKING CONTROL on the front panel to
center click position.
e Adjust VR4 so that the phase at rasing part of CTL pulse
and falling part of V-SYNC are lined up.
14 | PAL PB SWITCHING POINT
1. ina test tape TF-530RFS (TF-508RF) on “PAL B/G”
mode.
2. Test terminal P102 Pin (@) (SW PULSE) & VIDEO LINE
OUT, VR3.
3. Adjust “T” to 6.5 + 0.5H
e@ Use the SWITCHING PULSE for trigger signal.
. “PB” test tape TF-522RF on the “NTSC 4.43” mode.
. Test terminal P102 Pin @) (SW. PULSE), VIDEO LINE
OUT & VR1.
3. Adjust VR1 so that ‘“‘T”’ become 6.5 + 0.5H.
@ Use the SWITCHING PULSE for trigger signal.
Noe
1. “REC” TV program and ‘‘PB/PAUSE”.
2. Monitor screen & VR101.
3. Minimum vibration of still picture.
STEP ADJUSTMENT ITEM
1. Test mode/System mode Adjust Part
and Input Signal/Test tape. ih <
2. Test point and Adjust part. est p>
3. Result and Remarks. Point
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AUDIO ADJUSTMENT
| AUDIORECBIAS | REC BIAS
. “REC” 1kHz —8dB audio signal
on the “NTSC 3.58” mode.
2. A/C Head test terminal & VR251
3. 2.9mV + 0.lmV
A/C HEAD.
TEST TERMINAL
‘ a
Nw VR3 VRI VR2
Pi02 @@@
| GND
@) VRIOI
a
MAIN (A) PCB
MAIN(B) PCB
1. “PB” test tape TF-527BL (TF-513L)
2. Audio output & VR252
3. —3dBm + 0.5dBm (TF-527BL)
—9dBm + 0.5dBm (TF-513L)
SYSTEM JUDGE AFC
1. PAL COLORBAR signal on the “STOP” and mode.
2. TP1, TP2 & VR301
3. Adjust VR301 so that DC voltage levels A and
B are equal.
'NO GOOD
. “PB” test tape TF-540RFS (TF-509RF)
on the “3.58” mode.
2. Test terminal P102 Pin (3) (SW. PULSE),
VIDEO LINE OUT & VR2.
3. Adjust VR2 so that “T’’ become 6.5 + 0.5Hz.
e@ Use the SWITCHING PULSE for trigger
signal.
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