Panasonic DP-130 / DP-150 Service Manual / Other ▷ View online
18
1.1.10. Laser Printer Motor Drive Circuit
1. System Description
It consists of 16 bit CPU TMP86CH06U, FROM for programming, peripheral I/O. The CPU controls
mechanism of Laser Printer, Fuser Lamp temperature, and Laser Unit.
CPU
SH2
SH7041
Processor
LD
PM
LSU
APC
5VLD
Drum
1284
IF
MM
LD SW
Fuser Lamp
TS
GA3
IEEE1284
CPU
TMP86CH06U
GA1
IC7
LVPS
FROM
Motor
IC1
IC24
IC2,42
IC34
IC35
TH
2. Printer Motor Drive Circuit
This Printer Motor is a Brushless DC Motor.
nMMCNT
: When the signal level goes Low, the Printer Motor starts rotating.
nMMLCK
: Rotation status signal for Printer Motor. When the Printer Motor reaches a constant
speed, nMMRDY signal level goes Low.
The Printer Motor is powered by +24 VDC supply. When the interlocks are open, the +24 VDC
supply is cut off and the Printer Motor stops rotating.
CPU
SH2
SH7041
Processor
DT6
CN7
2
1
GA1
IC7
IC1
5V
144
111
nMMCNT
nMMLCK
19
3. Fuser Lamp Drive Circuit
It consists of 1 Fuser Lamps and Fuser Lamp is controlled by two HTC PC Boards.
The Fuser Lamp is powered by 100 VAC. When the CN7, Pin 4 (HTCNT) on the LVPS PCB goes
LOW, the Fuser Lamp turns ON. This lights up the PC5 LED and activates the TR1 photo-triac, and
100 VAC is sent to the Fuser Lamp.
to CPU
Board
Board
CN7
TR1
5V
4
PC5
AC1
L4
AC2
1
2
to Fuser Lamp
CN3
4. Interlock Safety Circuit
This safety circuit turns OFF the +24 VDC and +5 VDC supply voltages when the Printer Cover is
opened. When the Printer Cover is opened, the microswitch(es) on the LVPS Board are de-actu-
ated, turning OFF +24 VDC to the Printer Motor Drive Circuit, the HVPS, the Paper Feed Solenoid
Circuits, the Clutch Drive Circuit, and the Laser Driver Circuit on the Laser Unit.
LVPS
SW2
to CPU PC board
to CPU PC board
CN5
1
24V
5V
CN6
1
SW3
SW4
20
5. LSU Control Circuit
The laser control signals are described below.
Actual data is sent from CPU PCB to LSU.
nVIDEO
: Actual data is outputted by these 2 signals.
ADJUST : Laser Power Sample/Hold Timing Signal.
nHSYNC : This horizontal synchronization signal transmitted from the Beam Detection Sensor
sets the horizontal position of the laser beam as it crosses the OPC Drum.
ENABLE : The LSU is activated when this output signal is LOW. If an error occurs, the nLDON
output signal level goes High and the LSU is deactivated.
PMCLK
: This is the Polygon Motor Drive Clock.
nPMLCK : When the Polygon Motor speed is constant, the nPMRDY is at a Low output signal
level.
nPMCNT : This is the Polygon Motor Control Signal. The Polygon Motor rotates when the nPMON
output signal level is LOW.
DT5
DT22
CPU
SH2
SH7041
Processor
IC1
143
90
113
nHSYNC
IC13
IC11
5V
nPMCNT
PMCLK
nPMLCK
ENABLE
nVIDEO
ADJUST
11
13
12
5
6
7
4
GA1
IC7
CN4
21
1.2.
Power On Initial Flow Chart
1.2.1. Fax
<Check Output : If Signal is not correct, each IC
might be defective >
API
IC2(14) : Low / High
CPU(CS0)
IC1CPU(50) -> IC7(150)
-> (2) IC2(14)
-> (2) IC2(14)
CPU (RD)
IC1CPU(43) -> IC5
-> IC2(54)
-> IC2(54)
CPU(A1-3)
(A0~20)IC7(7~39) -> MSC(14,
16,17) -> IC2(4~32)
16,17) -> IC2(4~32)
CPU(D0-16)
IC1CPU(D0-16) -> IC2(33,35,38-)
Power
CN13(12,13)5V -> CPU
Master
Clock
Clock
7.16Hz -> (94)IC1CPU( 107)28.3MHz
XTAL
-> BL108
Reset
ResetIC5(8) -> -> (173)
->
->(108)IC1CPU
Power ON
Is Update Memory Card
Installed IC2(14) is Low ?
Initial Flow
CPU I/O Port Set
Y
Y
N
N
Panel Initial
Hardware Reset
Update Program
I/O Device Reset
I/O Device Port Set
1
0
Is program date
Same?
Boot Program in CPU Start
DRAM Working Area Clear
System Program (FROM) Start
System Program (FROM) Start
0V
3.5V
<Check Output : If Signal is not correct, each IC
* Check outside view of SC PCB before checking signal.
Especially check whether CN903 (FROM Card) pins
short or not.
Especially check whether CN903 (FROM Card) pins
short or not.
might be defective >
Click on the first or last page to see other DP-130 / DP-150 service manuals if exist.