Konica Minolta REGIUS 190, Руководство по обслуживанию

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2.6 Optical Unit
REGIUS MODEL 190 Service Manual Ver.1.00 2004.11.01
2.6.5 Checking H-sync Signal
Follow the procedures below to check the H-sync signal. This procedure shall be carried out with the power ON.
Adjustment of the H-sync should not be carried out in the fi eld. When abnormality occurs with the H-sync signal,
replace the optical unit as a whole. ("2.6.2Replacement of Optical Unit", p.76)
Danger
In this procedure, the laser beam may be emitted out of the REGIUS 190. Always wear a laser
protection glasses to prevent an eye injury.
1.
Remove the left cover. ( "2.2.2 Removal of the Left & Right
Covers, p.29" )
2.
Loosen 6 fi xing screws, and detach the board cover.
3.
Turn OFF (set to the right) the HVSW(SW3) (high voltage
SW) of the ADB2 (A/D board).
4.
Connect the oscilloscope to TP10 (HSYNC) located at the
upper left and to TP7 (AGND) located at lower left of the
ADB2.
5.
Set the range of the oscilloscope to 2V/div for Y-axis and
2msec/div for X-axis.
6.
Wear a laser protection glasses.
7.
Read the 14" x 17" cassette at high resolution mode.
8.
Check that the H-sync pulse which appears during the
image reading is within the speci
fi cation.
• Spec.: Interval = approx. 5.2msec
9.
When the measured result complies with the speci fi cation,
reassemble the parts in the reverse order to the above pro-
cedrue.
• Do not fail to set the high voltage SW to its original set-
ting, i.e. ON (set to the left).
Fixing Screw 6pcs)
(loosen)
ADB2
ON OFF
ON OFF
HVSW
SW3
TP10
HSYNC
AGND
TP7
Left Side
5.2msec