Oki OKIFAX OF5900, Maintenance Manual

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OKIFAX 5700/5900 5 - 2
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 fre-
quency and each voltage.
1) Clock Frequency
• Measurement point: R76 board; R180-2 pin and ground terminal
• Specification: 20.000 MHz ± 50 PPM
Note: If the counter does not read with 20.000 MHz, replace with a new crystal oscilla-
tor (X1).
2) +5V DC Voltage (SUB)
• Measurement point: R76 board; CN1-A8 pin and ground terminal
• Specification: +5.2V ± 4%
3) +5V DC Voltage
• Measurement point: R76 board; CN1-B10, A11, B11 and A12 pin and
ground terminal
• Specification: +5.1V ± 4%
4) +8V DC Voltage
•
Measurement point: R76 board CN1-A16 pin and ground terminal
• Specification: +8V ±4%
5) –8V DC Voltage
• Measurement point: R76 board; CN1-B15 pin and ground terminal
• Specification: –8V ±4%
6) +24V DC Voltage
• Measurement point: R76 board; CN1-B6 pin and ground terminal
• Specification: 22V to 27V
7) +38V DC Voltage
• Measurement point: R76 board; CN1-B12, A13 and B13 pin and ground
terminal
• Specification: +26V to +45V
8) Contact Image Sensor Output (SIG signal)
• Measurement point: R76 board; CN13-1 pin and ground terminal
• Specification: A waveform sample is shown below.
• Test chart: White sheet (A4 size)
1.0Vp-p
2.5ms