Oki OKIPAGE 10ex Maintenance Manual page 253

D-4 The printer does not recognize High capacity Second Paper Feeder.
• Do signal levels at Pin 2 (OPTSCLK-N) and 3 (OPTSD-P) PU alter at power-up time?
• Yes
• Yes
• Yes
40990901TH Rev.1
• No Replace Cable.
• No Replace D1 or D2.
Do signal levels at Pin 4, 7, and 9 of IC2 alter at power-up time?
• No Is signal level at Pin 2 of D5 at 3.9V?
• No Replace D5.
• Yes Is signal level at Pin 2 of TR1 around 5V?
• No Replace TR1.
• Yes Is signal level at Pin 2 of C3 high?
• No Replace C3.
• OK?
• No Is OSC1 being oscillated at 4MHz?
• No Replace OSC1.
• Yes Replace IC2.
Do signal levels at Pin 3 and 8 of IC1 alter at power-up time?
• No Replace IC1.
Does signal level at Pin 6 of IC1 alter at power-up time when Pin 8 of IC1 is
at low level?
• No Replace IC1.
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