Oki OKIPAGE 10ex Maintenance Manual page 251

C-4 Display on the LCD with some dot not lit.
• Are 4.15V, 3.3V, 2.46V, 1.61V, and 0.77V powers being supplied respectively to Pins
26, 27, 28, 29 and 30 of IC2 (HD44780)?
• Yes
• Yes
• Yes
• Yes
• Has the problem been solved?
• No
C-5 Unclear display on the LCD.
• Is +5V power being supplied to Pin 33 of IC2 (HD44780)?
• Yes
• Yes
• Yes
• Has the problem been solved?
• No
40990901TH Rev.1
• No Replace R5 through R10. (OLCC-PCB)
Is the COM signal being sent to Pins 47 through 62 (COM01 to COM16) of IC2
(HD44780)?
• No Replace IC2 (HD44780).
Is the SEG signal being sent to Pins 1 through 22 (SEG 19 to SEG40), Pins,
63 through 80 (SEG01 to SEG18) of IC2 (HD44780)?
• No Replace IC2 (HD44780).
Is the contact surface of the zebra rubber dirty?
• No Clear the dirt.
Replace the zebra rubber.
• Yes End.
Replace the LCD.
• No Replace CN1. (OLCC-PCB)
Are 4.15V, 3.3V, 2.46V, 1.61V, and 0.77V power being supplied respectively
to Pins 26, 27, 28, 29 and 30 of IC2 (HD44780)?
• No Replace R5 through R10. (OLCC-PCB)
Is the contact surface of a zebra rubbber dirty?
• No Clear the dirt.
Replace the zebra rubber.
• Yes End.
Replace the LCD.
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