Ricoh A250 Service Manual page 599

3.4 BACK-TO-BACK TEST
To make a back-to-back test, you need:
• Two machines (both of them must have a CiG4 board)
• Cross rosette
The procedure is as follows.
1. Switch off the machines
2. Connect two machines back-to-back using the cross rosette as follows.
1
2
3
4
5
6
7
8
Machine A
3. Make the following bit switch adjustments:
• In the machine acting in NT mode, set bits 0 and 1 of G4 parameter switch
0D to 1.
• In the machine acting in TE mode, set bit 0 of G4 parameter switch 0D to 0
and bit 1 to 1.
4. Reset the machines by switching them off, waiting a few seconds, then
switching back on.
5. Place a document in one of the machines, dial a number, then press Start.
6. After you have finished the test, set bits 0 and 1 of G4 parameter switch 0D
back to 0, then reset the machine.
NOTE: The following cannot be tested using this procedure:
• ISDN G3 communication
• P to M
SM
Cross Resette
1-29
BACK-TO-BACK TEST
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
Machine B
Both resistors must be
between 50 and 100 Ω.
A890T501.WMF
A250