March 2000 © TOSHIBA TEC
7-77
DP120F/DP125F Circuit Description
4. NCU PBA
This section describes the function of each circuit on the NCU PBA.
The NCU PBA consists of the transformer, relay, analog switch, and other peripheral devices.
It controls switching of the line path, generates dial pulses, detects line current, detects a ring
signal, and monitors the line.
The NCU PBA is connected to CN3 on the Main PBA. It can also be connected optionally to
CN4.
The description of this section is based on the NCU PBA for Line 1.
US/CA/TW models
Fig. 7-4-1
07-04-00
Summary of Contents for DP120F
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Page 401: ...DP120F DP125F Circuit Description 7 92 March 2000 TOSHIBA TEC 07 05 00 Fig 7 5 1 ...
Page 656: ...DP120F DP125F Troubleshooting 11 44 March 2000 TOSHIBA TEC ...
Page 700: ...DP120F DP125F Appendix 12 2 March 2000 TOSHIBA TEC 1 2 Error Count List ...
Page 701: ...March 2000 TOSHIBA TEC 12 3 DP120F DP125F Appendix 1 3 Function List for Maintenance ...
Page 702: ...DP120F DP125F Appendix 12 4 March 2000 TOSHIBA TEC 1 4 Drum Unit ...
Page 703: ...March 2000 TOSHIBA TEC 12 5 DP120F DP125F Appendix 1 5 Memory Dump List ...
Page 706: ...SHUWA SHIBA PARK BLDG A 2 4 1 SHIBA KOEN MINATO KU TOKYO 105 8524 JAPAN ...