Date: Feb. 16, 1994
LASER PRINTER: JX-9400
CHANGE IN THE ICU CIRCUIT BOARD UNIT.
1.Model name: JX-9400 (models bound for the destinations listed below).
Destination: (AE / AL / AU only)
USA, Canada, Barbados, Dominican Republic, Central America, Colombia, Venezuela,
Costa Rica.
2.General: The ICU circuit board unit has been changed to improve productivity.
ICU Circuit board unit Old New
Parts code CPWBX0056GC51 CPWBX0063GC51
No. : LPE-184
The circuit changes and parts changes which have been carried out in accordance with
the above mentioned change in circuit board are as described below in numbers ➀to
➇.
➀ Discontinuation of 16.000 MHz crystal (RCRS-1014ACZZ).
➁ In order to change the CPU clock from 8 MHz to 9.83 MHz, the CPU has been
changed to a 10 MHz unit (VHI68EC000-10 68pin PLCC).
Mass production circuit board
(CPWBX0056GC51)
19.660MHz
19.66MHz
16.000MHz
16MHz
CPU
64pin DIP
8MHz
19.66MHz
CF78057 CF78057
CPU
68pin PLCC
New circuit board
(CPWBX0063GC51)
19.66MHz
19.66MHz
9.83MHz
➀ Discontinued crystal.
➁ CPU changed.
SHARP CORPORATION Printer and Scanner Division
1/11
Orange
C
➂ The program ROM has been changed from two 1M mask ROM (VHI27C0121EGC /
VHI27C0122EGC) units to one 2M mask ROM (VHILH532G65-1) unit.
1M mask ROM
Upper 8bit
1M mask ROM
Lower 8bit
CPU CPU
16 bit
DATA
2M mask ROM
16bit
➂
➃ The CG ROM has been changed from two 2M mask ROM (VHILH532HG3-1 /
VHILH532HG4-1) units to one 4M mask ROM (VHILH534FHJ-1) unit.
2M mask ROM
Upper 8bit
2M mask ROM
Lower 8bit
CPU CPU
16bit
DATA
4M mask ROM
16bit
➃
➄ Change in 256K DRAM.
Due to a production halt by the maker, the part corresponding to VHIMN41464A08
(location No. IC 1, 2) has been changed to VHILH2464-10C, a part with the same
specifications.
➅ Discontinuation of CPU pull down resistance.
The new circuit board does not have block resistance installed in locations no. RA 8,
12, 15, 17, or 19 (refer to the figure below).
➅ Not installed.
2/11
➆ Addition of capacitors.
1. Two 1µF capacitors (RC-K1E104HCZZ) have been added between Vcc and GND
of LS244 (CG address).
+ 5v
+ 5v
Vcc
IC23
LS244
GND
0.1µF
Vcc
IC24
LS244
GND
CGA (8)
CGA (18 : 22)
CGA (0 : 7)
IC26
LS294
IC27
LS244
CGA (8)
CGA (18 : 22)
CGA (0 : 7)
2. A 330 pF capacitor (VCKYPU1HB331K) has been added between Vcc and GND of
the photo card.
330
+ 5V
60
Vcc
32
pF
GND
CN501
Added
➇ Discontinuation and change of screws.
1. The screw (RCORF1005ACZR 41A01) on the GND side of the 7.601 MHz crystal
and 19.660 MHz crystal has been eliminated.
2. The screw (RCORF1005ACZR) on the Vcc side of the 7.601 MHz crystal has been
changed to RCORF1009ACZZ (32A06).
+ 5V
+ 5V
0.1
0.1
+ 5V
19.660 MHz
14
41A01
7.601 MHz
12
6
41A01
34
41A01
41A0141A01
GND
58
0.1µ
32A06
0.1µ
7.601 MHz
12
+ 5V
0.1µ
41A01
0.1µ
6
19.660 MHz
14
41A01
41A01
39
58
GND
3.Action: From 1993 November production.
3/11
JX9400 JX9400
1 ICU PWB unit
4/11
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