Oki OKIPAGE 10ex Troubleshooting Manual page 53

C-2 The key switch operation on the operator panel is disabled.
• Do the signals at Pins, 3, 7, 10, 18, 23, 31 of IC1 (BU6152S) change from high to low
level by key switch pushing?
• Yes
• Yes
C-3 The LCD does not display any message.
• Is +5V power being supplied to Pin 33 of IC2 (HD44780)?
• Yes
• Yes
• Has the problem been solved?
• No
• Has the problem been solved?
• No
• Yes
• Has the problem been solved?
• No
40990901TH Rev.1
• No Replace SW1 to SW8.
Is the connection of CN1 correct? (OLCC-PCB)
• No Connect the connector correctly.
Replace IC1 (BU6152S).
• No Replace CN1. (OLCC-PCB)
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)?
• No Are the resistance values of R5 through R10 correct? (OLCC-PCB)
• No Replace R5 through R10. (OLCC-PCB)
• Yes
Replace IC2 (HD44780).
• Yes End.
Replace CN1. (OLCC-PCB)
• Yes End.
Is the contact surface of the zebra rubber dirty?
• No Clean the dirt.
Replace the zebra rubber.
• Yes End.
Replace the LCD.
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