Confirmation Items - Oki OKIOFFICE 84 Service Manual

5.2.1 Confirmation Items

The clock frequency and power voltage of the machine are not possible to adjust in the field. However, their
measurement procedures are described here for confirmation of clock frequency and each voltage.
1
Clock Frequency
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Measurement point: R51 board; LC3-3 pin and ground terminal
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Specification: 20.000 MHz ± 50 PPM
Note:
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If the counter does not read with 20.000 MHz, replace with a new crystal oscillator (X1).
2
+5V DC Voltage (SUB)
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Measurement point: R51 board; CN7-12 pin and ground terminal
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Specification: +5V ± 4% (+4.5V to 5.2V)
3
+5V DC Voltage
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Measurement point: R51 board; CN7-2 & 3 pin and ground terminal
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Specification: +5V ± 4% (+4.5V to 5.2V)
4
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8V DC Voltage
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Measurement point: R51 board; CN7-9 pin and ground terminal
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Specification: -12V to -6.5V
5
+30V DC Voltage
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Measurement point: R51 board; CN7-1 pin and ground terminal
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Specification: +24V to ±5V
6
+30V DC Voltage
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Measurement point: R51 board; CN7-8 pin and ground terminal
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Specification: +26V to +40V
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Test chart: White sheet (A4 size)
7
Contact Image Sensor Output (SIG signal)
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Measurement point: R51 board; CN5-1 pin and ground terminal
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Specification: A waveform sample is shown below.
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Test chart: White sheet (A4 size)
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Service Guide OKIOFFICE 84
Chapter 5 Adjustments
Page: 132