Oki B4100 - Manual (Page 201)

40055101TH Rev.4 201 /
Ground Terminal
LC2-3 Pin
Crystal Oscillator
Connector CN5-1 pin (SIG)
Ground Terminal
Connector CN7
CN7-1, 2, 3 (+5VDC)
CN7-8 (+30VDC)
CN7-9 (–8VDC)
CN7-12 (+5VSUB)
5.2.2 OKIOFFICE44/OKIFAX 4100 Measurement
1) Remove the AC power cord.
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 4-1.)
3) Connect extension cables to the R44 board.
4) Connect the frequency counter (for clock frequency), digital voltmeter (for power voltage) and
Oscilloscope (for SIG signal). See figure 5.2.1.
5) Reconnect the AC power code.
Main power supply is set to "ON" (PC1 ON) by loading the document on the cover-top.
(except +5V SUB)
6) Measurement
7) Remove the AC power code.
8) Reverse the disassembly procedures.
Figure 5.2.1 Measurement Points on R44 Board