Oki OKIPAGE6w Programming manual

All specifications are subject to change without notice.
OKIPAGE6w
LED Page Printer
Troubleshooting Manual
with Component Parts List
(OEL)

CONTENTS
1. OUTLINE.....................................................................................................1
2. TOOLS........................................................................................................1
3. CIRCUIT DESCRIPTION............................................................................2
3.1 Outline.....................................................................................................................2
3.2 CPU and Memory....................................................................................................4
3.3 Reset Control...........................................................................................................6
6.1 HUK PCB ............................................................................................................
............................................................................................................
............................................................................................................
6.2 P2H PCB 37
41
46
6.3 P6L PCB
3.4 EEPROM Control.....................................................................................................7
3.5 Centronics Parallel Interface....................................................................................8
3.6 Front Operator Panel...............................................................................................9
3.7 LED Head Control.................................................................................................10
3.8 Motor and clutch control........................................................................................12
3.9 Fuser Temperature Control....................................................................................14
3.10Sensor Control.......................................................................................................17
3.11Cover Open...........................................................................................................18
3.12Power Supply Part.................................................................................................19
4. TROUBLESHOOTING..............................................................................21
4.1 Troubleshooting Table............................................................................................21
4.2 Troubleshooting Flowchart.....................................................................................23
5. CIRCUIT DIAGRAM..................................................................................27
6. COMPONENT PARTS LIST AND LAYOUT.............................................. 36

- 1 -
1. OUTLINE
ThismanualhasbeenwrittentoprovideguidancefortroubleshootingoftheOKIPAGE6wPrinter
(primarilyforits printedcircuitboards), onanassumption thatthereader isknowledgeableof the
printer. Read the maintenance manual for this printer if necessary.
Note:
1. High voltage power supply board and power supply unit containing a high voltage power
supply is dangerous. From the viewpoint of the safety standards, the local repairing of a
defective board is not allowed. Thus, the objects to be locally repaired as a result of
troubleshooting are switches.
2. TOOLS
For troubleshooting the printer, the tools listed below may be needed in addition to general
maintenance tools.
Tool Remarks
Oscilloscope Frequency response 100 MHz or higher
Soldering iron A slender tip type, 15-20 watts

- 2 -
3. CIRCUIT DESCRIPTION
3.1 Outline
The circuit of OKIPAGE6w consists of a main control board, a main high voltage power supply
board,a syb-high voltage power supply board and a power supply unit. The block diagram is
shown in Fig. 3-1. The main control board controls the reception and transmission of data with
a host I/f and processes command analysis, bit image development, raster buffer read. It also
controls the engine and high voltage outputs.
(1)Reception and transmission control
The main control board has one parallel I/F port which is compliant to the IEEE 1284
specification.
Aninterfacetaskstores alldatareceivedfromthe hostintoareceivebuffer first, andreturns
the printer status upon request of the host.
(2)Command analysis processing
The OKIPAGE6w printer has the following emulation mode.
Hiper-W: OKI original
Anedittaskfetchesdatafromthereceivebuffer,analizescommands,andsetsI/Oregisters.
(3)Raster data processing
ThedecompressioncircuitintheCPUexpandsthecompresseddataandstoresthedatainto
the raster buffer.
(4)Raster data transfer
TheLEDheadcontrolcircuitintheCPU sendsthedatastoredintherasterbuffertotheLED
head.
(5)High voltage control (main, sub)
The high voltage control circuit in the CPU.
Thehighvoltagepowersupplyboardgenerateshighvoltageoutputs,andhavesensors,LEDfor
display.
The power supply unit generates +26VDC output, +5DC output.

- 3 -
Figure 3-1 OKIPAGE6w Block Diagram
DRAM
512kB
CPU
(nX8)
PCB H63-ONLY DRAM
1M x 4
Serial I/F
Parallel
I/F DRAM Bus
(Data : 4)
(Address : 11)
Internal
MASK ROM
62KB
High Voltage Power Unit
P6L
High Voltage Power Unit
P2H
EEPROM
1kb
Motor Driver
MTD2005F
OSC
16MHz HC125
RST
CN10CN1
ID Unit
CN7
Motor
HEAD1CN8
PLUNGER LED HEAD
CN2
0VP0V
0V5V
+5V+26V
LS07
CN4
Power Supply Unit

- 4 -
3.2 CPU and Memory
(1)CPU (MSM65917)
CPU core nX-8
CPU clock 16 MHz
Data bus width External 8 bits, Internal 8 bits
(2)Program ROM
ROM capacity 64k-bytes
ROM type 512 kbits (64k x 8 bits)
Access time 90 nsec
(3)Resident RAM
RAM capacity 512k bytes (1M x 4 bits D-RAM one piece)
RAM type 4M bits (1M x 4 bits)
Access time 60 ns

- 5 -
Figure 3-2 Block Diagram of CPU & Memory in OKIPAGE6w
CPU
IC 6
ALE
RDN
ROCS
DA10
DWR
CAS
RAS0
RAS1
RAS2
LS373
IC3
IC2
EPROM
(64k x 8 bits)
IC11
DRAM
(1M x 4 bits)
AD00 to AD07 A00 to A07
A08 to A15
DD00 to DD03
DA00 to DA09
Main Control Board

- 6 -
3.3 Reset Control
When power is turned on, RST-N signal is generated by IC5.
Power OFF
Power ON
+5V
RST-N
CPU
63
1
2
3
IC5
IC6
+5V+5V
RSTN

- 7 -
Instruction Start bit Operation Address Data
code
Read (READ) 1 10 A5 to A0
Write Enabled (WEN) 1 00 11XXXX
Write (WRITE) 1 01 A5 to A0 D15 to D0
Write All Address (WRAL) 1 00 01XXXX D15 to D0
Write Disabled (WDS) 1 00 00XXXX
Erase 1 11 A5 to A0
Chip Erasable (ERAL) 1 00 10XXXX
3.4 EEPROM Control
The BR93LC46A on the main control board is an electrical erasable/programmable ROM of 64-
bit x 16-bit configuration. Data input to and output from the ROM are bidirectionally transferred
inunitsof16bitsthroughI/Oport(EEPRMDT-P)inserialtransmissionsynchronizedwithaclock
signal from the CPU.
The EEPROM operates in the following instruction modes.
Write cycle timing (WRITE)
Read cycle timing (READ)
CPU
EEPRMDT-P IC4
IC6
EEPRMCS-P
EEPRMCLK-P
3
39
38
37 2
4
1
DI DO
CS
SK
EEPROM
CS
SK
DI
DO HIGH-Z
1 2 4 9 10 25
Min. 450 ns
10 1
A5 A4 A1 A0 D15 D14 D1 D0
STATUS
BUSY READY
Max. 500 ns
Max. 10 ms
HIGH-Z
12
110
4910
A5 A4 A1 A0
25 26
D15 D14 D1 D00 D15 D14
CS
SK
DI
DO

- 8 -
3.5 Parallel Interface
Parallel data is received from a host system via parallel interface which is compliant to the
IEEE1284 specification.
Compatible mode
TheCPUsets aBUSY-Psignal toONatthesametimewhenitreadsthe paralleldata(PDATA1-
P to PDATA 8-P) from the parallel port at the fall of PSTB-N signal. Furthermore, it makes the
store processing of received data into a receive buffer terminate within a certain fixed time and
outputs an ACK-N signal, setting the BUSY-P signal to OFF.
CPU
CN4
IC6 65 to 68, 71 to 74
PDATA1-P to PDATA8-P
PSTB-N
BUSY-P
ACK-N
PE-P
FAULT-N
SEL-P
IPRIME-N
SELIN-N
AUTOFD-N
64
78
77
79
80
81
82
83
84
2 to 9
1
11
10
12
13
32
31
36
DATA8-P
to
DATA1-P
STB-N
BUSY-P
ACK-N
PE-P
FAULT-N
IPRIME-N
SEL-P
SELIN-N
AUTOFEED-N
14
+5V
IC7
+5V or High level 18
PARALLEL DATA
(DATA BITs 1 to 8)
DATA STROBE
BUSY
ACKNOWLEDGE
0.5 µs min. 0.5 µs min.
0.5 µs min.
0.5 µs min.
0.5 µs max. 0 min.
0 min.
0 min.
0.5 µs to 10 µs
0 min.