NEC MultiSync 3D JC-1404HME Service Manual page 20

ADJUSTMENT PROCEDURE
Standard Adjustment Conditions
1) Power source voltage: AC220V, 240V 50 Hz/60 Hz
2) Aging: Adjust after leaving power on for a minimum twenty minutes.
3) Signals:
Video Analog 0.7Vp-p 75Q terminal positive polarity
Analog sync. on green
Video : 0.7Vp-p
Synchronizing . 0.3Vp-p
Synchronizing TTL level Negative polarity/positive polarity
Separate/composite
Deflection frequency H. 15kHz~38kHz
V. 50Hz~90Hz
1. SW. REG. UNIT
+85V LINE
Adjust VR651 to be 85V DC
2. Pre-adjustment of DEF PWB
Apply 23.5V DC between K3 and K4 (GND).
1) +18V adjustment
Adjust VR505 for 18V±0.05V DC between TP502 and the ground.
2) +12V adjustment
Apply a resistance load of 15i17W between X4 and X8 (GND).
Adjust VR503 for 12±0.05V DC between TP550 and the ground.
3) High voltage protector setting (For JC-1404HME/EE/R)
High voltage protector 1
With 25.8±0.1 V DC applied between TP2001 and the ground, adjust VR2001 for 0.3±0.05V DC
between TP2005 and the ground.
High voltage protector 2
With 24.5±0.1 V DC applied between TP2003 and the ground, adjust VR2002 for 0.3±0.05V DC
between TP2006 and the ground.
Due to DHHS, after adjusting VR2001 and VR2002, seal with an adhesive (TSE-385RTV) and cap
(74004891 ).
3)' High voltage protector setting (For JC-1404HMED)
High voltage protector 1
With 25.6±0.1 V DC applied between TP2001 and the ground, adjust VR2001 for 0.3±0.05V DC
between TP2005 and the ground.
High voltage protector 2
With 26.1±0.1 V DC applied between TP2003 and the ground, adjust VR2002 for 0.3±0.05V DC
between TP2006 and the ground.
Due to DHHS, after adjusting VR2001 and VR2002, seal with an adhesive (TSE-385RTV) and cap
(74004891).
3. Main Adjustment
Set the external VRs and switches as follows unless otherwise specified.
Front controls (as seen from front)
VR101 BRIGHTNESS At point where back raster disappears.
VR102 CONTRAST Max. (fully clockwise)
SW110 MODE SWITCH Off (right side)
SW111 COLOR SWITCH : Auto (left end)
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