SHARP LPE202 Technical Report

Date: Sep. 12, 1994

LASER PRINTER: JX-9400

No. : LPE-202

CHANGES TO ICU PWB UNIT

1.Model name: JX-9400

2.General: We have made various changes to the ICU PWB and parts change due to EMI.

3.Description: Change of the ICU PWB unit of each destination is as diagram below. Please see the

following items (1), (2), (3), the attached circuit diagram and the parts list for more
information.

Destination Current New

UE4*

BG* CPWBX0056GC53 CPWBX0063GC52 ’94/3

Except for

UE4 and BG

CPWBX0056GC51 CPWBX0063GC51 ’94/3

CPWBX0063GC51 CPWBX0063GC54 ’94/6

Same as new CPWBX0063GC51 ’94/3 (2) Parts change due to application of EMI

Effective

time

Description

(1) Changes due to improvement of

productivity

(2) Changes due to application of EMI
(3) Addition of IC socket
(1) Changes due to improvement of

productivity

(2) Changes due to application of EMI

* Destination code UE4: For special version (Voltage/Frequency=220V/50, Cassette, A4)

BG : Europe

(1)Announcements of change of specifications and discontinuation of parts production

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
CF78057 CF78057

16.000MHz

16MHz

New circuit board
(CPWBX0063GC51)

19.66MHz

19.66MHz

19.66MHz

CPU
64pin DIP

8MHz

1

Discontinued crystal.

CPU
68pin PLCC

2

9.83MHz

CPU changed.

SHARP CORPORATION Printer and Scanner Division

1/12

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

3

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

4

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.

2/12

➆ Addition of capacitors.

1. Two 1µF capacitors (RC-K1E104HCZZ) have been added between Vcc and GND
of LS244 (CG address).

+ 5v

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.

+ 5V

Added

330

pF

Vcc
IC23
LS244
GND

0.1µF

+ 5v

Vcc
IC24
LS244
GND

60

Vcc

32

GND

CN501

CGA (8)
CGA (18 : 22)

CGA (0 : 7)

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

12

0.1

+ 5V

19.660 MHz

14

41A01

7.601 MHz

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

1

41A01

41A01

39

58

4

GND

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(2)Parts change due to improvement of EMI

To improve the level of EMI, we have made changes to the ICU PWB resistance and
its condenser. Changes are shown in following chart.

Description Placing No. Current New

Change resistance from 22Ω

➀

to 33Ω
Addition of the condenser

➁

100pF
Change the condenser from

➂

330pF to 120pF
Addition of the condenser

➃

330pF

R43, 53~60 VRS-TP2BD220J VRS-TP2BD330J

C4 — VCCCTV1HH101J

CN501 VCKYPU1HB331K VCKYPU1HB121K

CN505 — VCKYPU1HB331K

(3)Addition of the IC socket for IC3 to the UE4 ICU PWB for specific countries

We have added the IC socket (QSOCZ0002GCZZ) to the mask ROM section of IC3 to
improve its function as shown in the illustration below. We also have changed the parts
code of the ICU PWB along with this change.

<Current> <New>
ICU PWB unit CPWBX0063GC51 CPWBX0063GC54

Addition of IC socket (QSOCZ0002GCZZ)

4.Action: From March 1994 production (Changes due to improvement of productivity and EMI)
From June 1994 production (Addition of IC socket for EU4)

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