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3.
Main Adjustment
Set the external VRs as follows unless otherwise specified.
Front controls
VR7A1 CONTRAST:
VR7A2 BRIGHTNESS:
VR4A2 V. POSITION:
VR4A1 V. SIZE:
VR5A1 H. POSITION:
3-1) MAIN PWB Adjustment
(1) ±12V Adjustment
Receiving all white signal, adjust VR501 (for +12V adjustment) to obtain +12 ±0.1 V DC between
TP551 and GND.
(2) Horizontal Hold
a) Short TP501 and GND
b) adjust horizontal hold VR556 so that there is one screen.
c) Receiving signal 5 (fH=35kHz), check for synchronization.
d) Remove the short between TP501 and GND.
(3) Horizontal Raster Centering
a) Adjust L503 and L504 so that horizontal amplitude is approximately 240 mm.
b) When the screen is rolling, centering may be adjusted with VR5A 1 (H. POSITIONA). After
adjustment, return VR5A 1 to the center click position.
c) With background raster brightened with VR7 A2 (BRIGHTNESS) in MAX position, re-insert
the connector RH so that the background raster is in the center of the CRT screen.
(4) Horizontal Position (Adjust to the raster center)
Adjust respective VRs so that the display area positions in the raster center when the following
signals (all white signals) are received. Adjustment may be conducted in arbitrary order.
Signal
VGA
II
MAC
800X600
(5) Vertical Linearity
a) Receiving cross-hatched inverted signal, adjust VR452 (V. SUBHEIGHT) so that vertical
amplitude is approximately 180 mm.
b) Adjust VR451 (V. LAN) for the optimum vertical linearity.
Max. (fully clockwise)
At point where bac k raster disappears.
Mechanical center
Center click position
Center click position
R H3
RH2
R H1
fH=31.5kHz
1
fH=35kHz
4
fH=35kHz
5
-13 -
RH1: for coarse adjustment
RH2: for fine adjustment
RH3: no adjustment
VR
VR552
VR554
VR553
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