PRS-600
10
SECTION 4
ELECTRICAL ADJUSTMENT
VCOM VOLTAGE ADJUSTMENT
VCOM voltage for the Ink Indicator Element varies for each Ink
Indicator Element. VCOM adjustment is required when replacing
MAIN board or CHASSIS_ASSY.
Note:
Ink Indicator Element is included in CHASSIS_ASSY.
Voltage is generated only when the screen is changed, so the
adjustment needs to be performed while changing the screen. Use
the slideshow function to change the screen sequentially.
Procedure:
1. Refer to test mode “17. Slideshow Setting”. The setting is
“ON”.
2. Refer to test mode “1. Test Panel”. Enter the “Test Panel”,
check that the slideshow start.
3. Observe the TP940 on an oscilloscope (refer to Fig. 2), and use
RV901 to adjust the voltage that is generated when the screen
is changed so that it satis
fi
es the standard.
Standard: Written on the
fl
exible card wire of the display panel
with a marker. (–1 V to –2.5 V) (refer to Fig. 1)
(In case of Fig. 1: The value of VCOM is –1.94 V.)
Adjustment Location:
RV901
MAIN board
TP940
Fig. 1:
MAIN board
chassis_assy
VCOM voltage
Fig. 2:
500 mV/DIV, 200 ms/DIV
1 Vp-p
660 ms
