March 2000 © TOSHIBA TEC
7-101
DP120F/DP125F Circuit Description
Signal Name
Type
Active
Description
Destination
CHVON
O
H
Charge Voltage Supply Signal
IC52
DEVON
O
H
Development Roller Voltage Supply Signal
IC52
TCVON,
O
H
Transfer Charger Current Set 1/2 Signal
IC52
PCU
DRBIS1-2
O
H
Drum Bias Voltage Set 1/2 Signal
IC52
To supply constant-current to the transfer charger, the I/OP-2 GA causes either of the THVON
and PCU signals to be HIGH. Then Q5 on the HVPS turns on to supply 24VSW to IC3. IC3
causes Q9 to turn on and off and repeat supplying and cutting off of current to the primary
circuit of the transformer (T3). This allows power to be emitted from the secondary circuit of the
transformer and constant-current to be supplied to the transfer charger.
At this time, the value of the current to be supplied is set according to the signal levels of the
THVON and PCU signals.
When the THVON signal is at LOW level and the PCU signal is at HIGH level, Q7 and Q8 on
the HVPS turn on and off respectively to 210µA to the transfer charger.
When the THVON signal is at HIGH level and the PCU signal is at LOW level, Q7 and Q8 on
the HVPS turn off and on respectively to 180µA to the transfer charger.
When both the THVON and PCU signals are at LOW level, Q5 on the HVPS turns off to cut off
the supply of current.
To supply constant-voltage to the drum, the I/OP-2 GA causes the DRBIAS1 signal to be HIGH.
Then Q10 on the HVPS turns off and Q11 repeats turning on and off to repeat supplying and
cutting off of current to the primary circuit of the transformer (T4). This allows power to be
emitted from the secondary circuit of the transformer and constant-voltage to be supplied to the
drum.
At this time, the value of the voltage to be supplied is set according to the DRBIAS2 signal
output from the I/OP-2 GA.
When the DRBIAS signal is at LOW level, the photo-coupler (PC2) on the HVPS turns on to
supply -100V to the drum.
When the DRBIAS signal is at HIGH level, the photo-coupler (PC1) on the HVPS turns on to
supply -200V to the drum.
When the DRBIAS1 signal is at LOW level, 0V is supplied to the drum.
Constant voltage is supplied to the grid when the anode side of the series of Zener diodes
(ZD4-7) with the cathode side connected to the PG is connected.
Содержание DP120F
Страница 1: ...PLAINPAPERFACSIMILE File No 31200001 R0112216901 TTEC ...
Страница 294: ...March 2000 TOSHIBA TEC 6 7 DP120F DP125F PBA Outline and Sensor Function 3 7 PC I F PBA Fig 6 3 8 06 03 08 ...
Страница 311: ...DP120F DP125F Circuit Description 7 2 March 2000 TOSHIBA TEC 07 01 02 Fig 7 1 2 US CA TW models 2 3 ...
Страница 312: ...March 2000 TOSHIBA TEC 7 3 DP120F DP125F Circuit Description Fig 7 1 3 07 01 03 US CA TW models 3 3 ...
Страница 313: ...DP120F DP125F Circuit Description 7 4 March 2000 TOSHIBA TEC Fig 7 1 4 07 01 01E EU AU ASIA HK models 1 3 ...
Страница 314: ...March 2000 TOSHIBA TEC 7 5 DP120F DP125F Circuit Description Fig 7 1 5 07 01 02E EU AU ASIA HK models 2 3 ...
Страница 315: ...DP120F DP125F Circuit Description 7 6 March 2000 TOSHIBA TEC Fig 7 1 6 07 01 03E EU AU ASIA HK models 3 3 ...
Страница 316: ...March 2000 TOSHIBA TEC 7 7 DP120F DP125F Circuit Description 1 2 Block Diagram 07 01 10 Fig 7 1 7 ...
Страница 337: ...DP120F DP125F Circuit Description 7 28 March 2000 TOSHIBA TEC 3 1 Memory Circuit Fig 7 3 1 07 03 01 ...
Страница 387: ...DP120F DP125F Circuit Description 7 78 March 2000 TOSHIBA TEC EU AU ASIA HK models Fig 7 4 2 07 04 00E ...
Страница 401: ...DP120F DP125F Circuit Description 7 92 March 2000 TOSHIBA TEC 07 05 00 Fig 7 5 1 ...
Страница 579: ...March 2000 TOSHIBA TEC 9 15 DP120F DP125F Dialing and Communication Procedure b Standard procedure ...
Страница 654: ...DP120F DP125F Troubleshooting 11 42 March 2000 TOSHIBA TEC 2 3 Flow Chart Recommended for Field Service ...
Страница 655: ...March 2000 TOSHIBA TEC 11 43 DP120F DP125F Troubleshooting 2 4 Flow Chart Recommended for Telephone Screening ...
Страница 656: ...DP120F DP125F Troubleshooting 11 44 March 2000 TOSHIBA TEC ...
Страница 699: ...March 2000 TOSHIBA TEC 12 1 DP120F DP125F Appendix Chapter 12 Appendix 1 Sample List 1 1 Protocol Trace List ...
Страница 700: ...DP120F DP125F Appendix 12 2 March 2000 TOSHIBA TEC 1 2 Error Count List ...
Страница 701: ...March 2000 TOSHIBA TEC 12 3 DP120F DP125F Appendix 1 3 Function List for Maintenance ...
Страница 702: ...DP120F DP125F Appendix 12 4 March 2000 TOSHIBA TEC 1 4 Drum Unit ...
Страница 703: ...March 2000 TOSHIBA TEC 12 5 DP120F DP125F Appendix 1 5 Memory Dump List ...
Страница 706: ...SHUWA SHIBA PARK BLDG A 2 4 1 SHIBA KOEN MINATO KU TOKYO 105 8524 JAPAN ...