Measurement - Oki OKIFAX4550 Maintenance Manual

5.2.2

Measurement

1) Trun the AC power OFF.
2) Carry out the disassembly procedure up to Cover assembly-top, Frame assembly-scanner,
and Unit-printer.
(Refer to the Mechanical Disassembly and Reassembly in Chapter 4.)
3) Connect extension cables to the 46F board.
4) Connect the frequency counter (for clock frequency), digital voltmeter (for power voltage)
and Oscilloscope (for SIG signal). See Figure 5.1.
5) Turn AC power ON.
Main power supply is set to "ON" (PC1 ON) by loading the document on the cover-top.
(except +5V SUB)
6) Measurement
7) Turn the AC power OFF.
8) Reverse the disassembly procedures.
Ground Terminal
41309401TH Rev.4
Connector CN7
CN7-1 (+24VDC)
CN7-2, 3 (+5VDC)
CN7-8 (+30VDC)
CN7-9 (-8VDC)
CN7-12 (+5VSUB)
Figure 5.1 Measurement Points on 46F Board
LC3-3pin
Crystal Oscillator
Connector CN5-1
(SIG)
Ground Terminal
180 /