Problem printing barcodes

When I try to print spoolfiles with barcodes, the printer goes nuts. It
prints one line of garbage at the top of the page and then prints out blank
pages until the paper tray is empty.
My operating system is V4R5.
The printer is an HP4 with the following device description:

                   Display Device Description
5769SS1 V4R5M0  000526                            GTR
 Device description . . . . . . . . :   DEVD        CMHIT
 Option . . . . . . . . . . . . . . :   OPTION      *ALL
 Category of device . . . . . . . . :               *PRT
 Device class . . . . . . . . . . . :   DEVCLS      *LAN
 Device type  . . . . . . . . . . . :   TYPE        *IPDS
 Device model . . . . . . . . . . . :   MODEL       0
 LAN attachment . . . . . . . . . . :   LANATTACH   *IP
 Advanced function printing . . . . :   AFP         *YES
 Port number  . . . . . . . . . . . :   PORT        0
 Online at IPL  . . . . . . . . . . :   ONLINE      *YES
 Font . . . . . . . . . . . . . . . :   FONT
   Identifier . . . . . . . . . . . :               011
   Point size . . . . . . . . . . . :               *NONE
 Form feed  . . . . . . . . . . . . :   FORMFEED    *CONT
 Separator drawer . . . . . . . . . :   SEPDRAWER   *FILE
 Separator program  . . . . . . . . :   SEPPGM      *NONE
   Library  . . . . . . . . . . . . :
Printer error message  . . . . . . :   PRTERRMSG   *INQ
Message queue  . . . . . . . . . . :   MSGQ        *CTLD
Current message queue  . . . . . . :               QSYSOPR
  Library  . . . . . . . . . . . . :                 QSYS
Activation timer . . . . . . . . . :   ACTTMR      170
Image configuration  . . . . . . . :   IMGCFG      *NONE
Maximum pending requests . . . . . :   MAXPNDRQS   6
Print while converting . . . . . . :   PRTCVT      *YES
Print request timer  . . . . . . . :   PRTRQSTMR   *NOMAX
Form definition  . . . . . . . . . :   FORMDF      F1C10110
  Library  . . . . . . . . . . . . :                 *LIBL
Character identifier . . . . . . . :   CHRID       *SYSVAL
Remote location  . . . . . . . . . :   RMTLOCNAME
  Name or address  . . . . . . . . :               166.99.181.9
User-defined object  . . . . . . . :   USRDFNOBJ   *NONE
  Object type  . . . . . . . . . . :                 *NONE
Data transform program . . . . . . :   USRDTATFM   *NONE
User-defined driver program  . . . :   USRDRVPGM   *NONE
Dependent location name  . . . . . :   DEPLOCNAME  *NONE
Allocated to:
Job name . . . . . . . . . . . . . :               QSYSARB
  User . . . . . . . . . . . . . . :                 QSYS
  Number . . . . . . . . . . . . . :                 622453
Text . . . . . . . . . . . . . . . :   TEXT        *BLANK
User-defined options . . . . . . . :   USRDFNOPT

I've tried looking in IBM's manuals and redbooks, but I can't find any
answers. Does anyone have any idea how to get this to work?

Mark Taylor
AS/400 software consultant
Columbus, Ohio