HP 1220c - Deskjet Color Inkjet Printer - Page 118

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Power Supply
Moule
(A)
ROM_DATA[0:15]
SDRAM_DATA[0:15]
EEPROM
1024
x
8 Bytes
E
E
D
a
t
a
EEClk
Arabian
Analog
ASIC
A
C
L
K
A
S
I
D
ASOD
ALOAD
+5V Output Supply
+3.3V Output Supply
Reset
+18V Input Supply
Line
Feed
Motor
Driver
Output
Ramp
Motor
Driver
BDM
Connector
Centronic Connector
30 Ways connector
24 Ways Flex
connector
Helios C
Digital
ASIC
Flash
2x1Mx16
SDRAM
1x4Mx16
ROM_Addr[1:21]
ROM_CONTROL[0:3]
SDRAM_Addr[0:13]
SDRAM_CONTROL[0:8]
15.975MHz
Crystal
XI
XO
BDM Interface Signals
USB Interface
IEEE 1284 Interface
Top Door
Sensor
USB
Connector
Power
Connector
(B) (C)
(B) To Line Feed Motor
(A) To Service Station Motor & Fan
(C) To Output Ramp Motor
+32V Input Supply
24 Ways Flex
connected to
Carriage Board
+18V/+32V
from Power
Supply Module
To Personal Computer
USB/Centronic Connector
Power
Magic
Cancel
Ink
Key Panel
Carriage
Motor
Line Feed
Motor
Service
Station
Output Ramp
Motor
Oop
Sensor
Dudley III ASIC Interface Signals
Trident+ ASIC Interface Signals
Line Feed
Board
To Power
Supply Module
- Power Switch
Status Sense
PSM_On
PSM_nEnable
(1)
(2)
(3)
Power ON/OFF Signal Flow
(1) User press Power Button on Key Panel
(2) Power Supply Module (PSM) activate "PSM_nEnable"
(3) Escher Logic Board activate/deactivate
"PSM_On" to turn ON/OFF PSM.
(LEFT HAND SIDE)
(RIGHT HAND SIDE)
SYSTEM LEVEL BLOCK DIAGRAM (ELECTRICAL)
LOGIC BOARD SIGNAL FLOW
Lee Chin Kang
29 September 1999
RevA
x2
x7
x5
x5
x2
x2 x2
11 PSM_nEnable
Escher Logic Board
GPIO Assignment
0 KP_Cancel Button
1 USB_Enable
2 HumidFast
3 BackDoorSensor
4 PwrLED
5 MagicLED
6 InkLED
7 KP_MagicButton
8 PwrButton
9 TopDoorSensor
10 PaperSensor
13 RampMotorEnable
14 IndexMaker
15 Mechless
12 PwrOn
Back Door
Sensor