Checking H-Sync Signal - Konica Minolta REGIUS 190 Service Manual

2.6 Optical Unit
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 field. 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 fixing 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 specification.
• Spec.: Interval = approx. 5.2msec
9.
When the measured result complies with the specification,
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).
80
REGIUS MODEL 190 Service Manual Ver.1.00 2004.11.01
Fixing Screw 6pcs)
(loosen)
TP10
HSYNC
Left Side ADB2
AGND
ON
TP7
5.2msec
ON OFF
OFF
HVSW
SW3