SHARP LPE147 Technical Report

Date: Apr. 16, 1993

LASER PRINTER : JX-9600 SERIES

• SOFTWARE UPDATE TO CORRECT THE PCL-5 CHARACTER

• IMPLEMENTATION ERROR TRANSITION FROM EPROM TO
MASK ROM

• Software update to correct the PCL-5 character implementation error

1.Model name: JX-9600/JX-9650

No. : LPE-147

2.Phenomenon: PCL-5 character implementation error (a⇒c / !⇒#, etc.)

3.Cause: We have been successful to track the cause after checking the problem based on the

information from SEC and SEEG. It is not a program bug but the problem on the
AM29005 processor itself. It would occur only when the ROM contents are copied onto
the RAM area using the COPY command or when an interrupt occurred at the start of
the COPY command (LOADM). Whereas, it may occur in a very rare case; our
engineering team thinks it could only occur once per 1000, assuming font selection is
done 10 times at a maximum.

4.Action: For it may take a lot of times to revise the AM29005, the program is corrected on the
version 60MJ.

5.Description:

Location

IC-9 VHILH534F42i1 VHI27C4031AGC

Current (mask ROM) New (EPROM)

ROM version: 60MI ROM version: 60MJ

6.Effective time:

SHARP CORPORATION Printer and Scanner Division

IC-10 VHILH534F43i2 VHI27C4032AGC
IC-11 VHILH534F44i3 VHI27C4033AGC
IC-12 VHILH534F45i4 VHI27C4034AGC

* PS board version (6PSB) (6PSC)

Since December 1993.

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Orange

C

• Transition from EPROM to mask ROM

1.Model name: JX-9600/JX-9650

2.General: For productivity enhancement, the IC ROM of the ICU PWB is changed from the

EPROM to mask ROM

3.Description:

Location

IC-9 VHI27C4031AGC VHILH534FH2-1
IC-10 VHI27C4032AGC VHILH534FH3-1
IC-11 VHI27C4033AGC VHILH534FH4-1
IC-12 VHI27C4034AGC VHILH534FH5-1

Outlook of the chip

Current (EP ROM) New (mask ROM)

ROM version: 60MJ ROM version: 60MJ

4.Action: Since February 1993 for JX-9600.
Since January 1993 for JX-9650.

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