Oki ML490 Maintenance Manual - Page 10
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10 / 42114101 Rev.1 AC-input Microprocessor AD-BUS ADDRESS 14.456 MHz 4 A/D POWLEV HTEMP HEADGAP SPTEMP ROM 8Mbit Max. 16Mbit Serial Serial EEPROM 1Kbits I/F-IPT Print-IPT Release-SW Bottom-SW M FAN DRAM 4Mbit PE-SENSOR OPERATION Serial PANEL FAN alarm Alarm -circuit HD alarm Over-V alarm Reset circuit Power-off SW Transformer AC Fuse Rectifier circuit Over-V alarm 50 volt 12 volt 5 volt Divider Converter USB Controller LSI USB I/F (opt.) CSF (opt.) Roll paper stand ParaI/F HTEMP Head driver (opt.) Serial- I/F HEAD HD alarm HEADGAP HEADGAP-SW Photo sensor SP/LF driver M SP Thermister SPTEMP M LF RESET 5VD POWLEV HTEMP Fuse 42 V 42V -8V 3.3V 5VS Figure 2-1
![](/manual_guide/products/oki-data-ml490-maintenance-manual-294cb66/10.png)
42114101
Rev.1
10 /
Figure 2-1
AC-input
SW
AC Fuse
HTEMP
14.456
MHz
4
POWLEV
HTEMP
HEADGAP
SPTEMP
A/D
PE-SENSOR
OPERATION
PANEL
Serial
Alarm
-circuit
HD alarm
Over-V alarm
Over-V alarm
FAN alarm
Power-off
Transformer
Rectifier
circuit
50 volt
12 volt
5 volt
42V
-8V
3.3V
5VS
Reset
circuit
I/F-IPT
Print-IPT
EEPROM
1Kbits
Microproce-
ssor
ADDRESS
Serial
Serial
ROM
8Mbit
Max.
16Mbit
AD-BUS
DRAM
4Mbit
LSI
RESET
5VD
POWLEV
Fuse
42 V
SP/LF
driver
HD alarm
SPTEMP
Head
driver
Photo sensor
HEAD
M
M
SP
Thermister
LF
FAN
HTEMP
(opt.)
Serial-
I/F
(opt.)
Roll paper
stand
(opt.)
CSF
Divider
Converter
Release-SW
Bottom-SW
HEADGAP-SW
HEADGAP
Para-
I/F
USB
I/F
M
USB
Controller