1600/2000/2500 SCANNER
7 - 10
December 2000 © TOSHIBA TEC
7.5.2 Exposure Lamp Control Circuit
This circuit is made up of the motor control IC (IC4), and the transformer, capacitor and other peripheral
elements on the Inverter PWA and controls the lighting of the exposure lamp.
The circuit configurations are different on the DP1600 series and DP2000/2500 series.
DP1600 series
The motor control IC (IC4) turns the LAMP signal to the HIGH level.
The transistor (Q3) turns on and the LAMP signal turns to the GND level.
The transistor (Q3) on the Inverter PWA turns on to apply +24V to the Inverter PWA.
The transistors (Q1, Q2) are biased by the starting resistors (R1, R2). At this time, either of Q1
and Q2 turns on due to the transistor characteristics.
The following explains a case where Q1 has turned on.
If Q2 has turned on, Q1 and Q2 should be substituted for each other.
Bias voltage of Q1 is produced in the Nb winding of the transformer (T1) to allow Q1 to completely
turn on. At this time, Q2 turns off because it is reverse biased.
When current flows through T1, the primary circuit resonates due to the Np winding and capacitor
(C1). This causes the bias voltage of the Nb winding to be reversed.
Q1 turns off due to the reverse bias voltage and Q2 turns on.
As Q1 and Q2 turn on and off alternately in this way, high-frequency voltage is produced in the
primary circuit of T1. This voltage is boosted by the Np winding and Ns winding and supplied to
the exposure lamp for lighting.
08-05-01
IC1
Scanner MPU
Exposure lamp
IC4
Motor
control IC
CN2
PG
PG
CPUA0~19
Scanner control PWA
Inverter PWA
CPUD0~15
LAMP
58
+24V
ICP1
Q3
Q3
Q1
R1
C1
Np
T1
Nb
Ns
R2
Q2
2
1
1
4
3
2
1
3
CN1
CN2
Содержание DP1600
Страница 1: ...DIGITALPLAINPAPERCOPIER DP1600 2000 2500 File No 31100011 R0111216600 TTEC ...
Страница 2: ...Copyright 2000 TOSHIBA TEC CORPORATION ...
Страница 21: ...1600 2000 2500 OUTLINE OF THE MACHINE 2 8 December 2000 TOSHIBA TEC B 2 Switches SW2 SW1 02 02 04 ...
Страница 23: ...1600 2000 2500 OUTLINE OF THE MACHINE 2 10 December 2000 TOSHIBA TEC C 1 Motors M1 M3 M5 M7 M6 M4 M2 02 02 06 ...
Страница 145: ...8 PRINTING 8 1 8 1 General Description 8 1 8 2 Structure 8 2 8 3 Laser Diode 8 6 8 4 Disassembly and Replacement 8 7 ...
Страница 231: ...December 2000 TOSHIBA TEC 16 1 1600 2000 2500 PC BOARD 16 BOARD ASSEMBLY 16 1 PWA F MAN 16 01 01 ...
Страница 232: ...1600 2000 2500 PCB BOARD 16 2 December 2000 TOSHIBA TEC 16 2 PWA F RLY 16 02 01 ...
Страница 233: ...December 2000 TOSHIBA TEC 16 3 1600 2000 2500 PC BOARD 16 3 PWA F PIF 16 03 01 ...
Страница 234: ...1600 2000 2500 PCB BOARD 16 4 December 2000 TOSHIBA TEC 16 4 PWA F PNL 16 5 PWA F VR 16 04 01 16 05 01 ...
Страница 236: ...1600 2000 2500 PCB BOARD 16 6 December 2000 TOSHIBA TEC 16 7 PWA F FUS ASD AUD CND TWD SAD models 16 07 01 ...
Страница 237: ...17 WIRE HARNESS CONNECTION DIAGRAMS 17 1 ...
Страница 264: ...1 1 KANDA NISHIKI CHO CHIYODA KU TOKYO 101 8842 JAPAN ...