HP 450c Service Manual - Page 135

R°'v$ t#° E&°ctr$cs Mdu&°, Refer

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Removing the Electronics Module Refer to figure 3 ' page 14. Important Information The Printer firmware is contained either on a flash ROM SIMM at the back of the Printer or on a masked ROM inside the electronics module. The firmwareĆrevision level, for example A.01.03, is printed by the Printer on the setup sheet and on the service configuration plot. The revision level is also printed on a label on any flash ROM SIMM. Do not open the electronics module. Important: When replacing the electronics module, always remember to check the firmware revision level of the new electronics module. The revision level will be printed on the top surface of the module. Also, check the firmware revision level of the ROM SIMM installed in the old electronics module. With this information you must do the following: 1. If the firmware revision level of the ROM SIMM in the old electronics module is lower than the firmware revision level of the new electronics module, then you must not install the ROM SIMM into the module. 2. If the firmware revision level of the ROM SIMM in the old electronics module is higher than the firmware revision level of the new electronics module, then you must install the ROM SIMM into the module. Example 1: The ROM SIMM firmware revision level is A.01.03 and the firmware revision level of the electronics module is A.01.04. You would use the electronics module without the ROM SIMM installed. Example 2: The ROM SIMM firmware revision level is A.01.05 and the firmware revision level of the electronics module is A.01.04. You would use the electronics module with the ROM SIMM installed. Removal The electronics module is a fieldĆreplaceable part. You do not need to open it. If it is faulty, exchange it for a new one. 1. Remove the right endĆcover ' page 8Ć11. 2. Disconnect the frontĆpanel assembly from the main PCA. 3. Unscrew the cover plate at the back of the Printer, and remove it. 4. Remove one screw (item 1) and washer (item 2) from the back cover. Removal and Installation HP DesignJet 430, 450C and 455CA Printers 8-13

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Removal and Installation
8-13
HP DesignJet 430, 450C and 455CA Printers
R°’)v$(" t#° E&°ctr)($cs M)du&°
Refer to figure 3
'
*a"° 14.
Important Information
T#° Pr$(t°r !$r’war° $s c)(ta$(°d °$t#°r )( a !&as# ROM SIMM at t#° bac%
)! t#° Pr$(t°r )r )( a ’as%°d ROM $(s$d° t#° °&°ctr)($cs ’)du&°. T#°
!$r’war°3r°v$s$)( &°v°&, !)r °xa’*&° A.01.0±, $s *r$(t°d b2 t#° Pr$(t°r )( t#°
s°tu* s#°°t a(d )( t#° s°rv$c° c)(!$"urat$)( *&)t.
T#° r°v$s$)( &°v°& $s a&s)
*r$(t°d )( a &ab°& )( a(2 !&as# ROM SIMM.
D) ()t )*°( t#° °&°ctr)($cs
’)du&°.
Important
: W#°( r°*&ac$(" t#° °&°ctr)($cs ’)du&°, a&wa2s r°’°’b°r t)
c#°c% t#° !$r’war° r°v$s$)( &°v°& )! t#°
new
°&°ctr)($cs
’)du&°. T#° r°v$s$)( &°v°& w$&& b° *r$(t°d )( t#° t)* sur!ac° )!
t#° ’)du&°. A&s), c#°c% t#° !$r’war° r°v$s$)( &°v°& )! t#° ROM
SIMM $(sta&&°d $( t#°
old
°&°ctr)($cs ’)du&°. W$t# t#$s
$(!)r’at$)( 2)u ’ust d) t#° !)&&)w$(":
1. I! t#° !$r’war° r°v$s$)( &°v°& )! t#° ROM SIMM $( t#° )&d
°&°ctr)($cs ’)du&° $s
lower
t#a( t#° !$r’war° r°v$s$)( &°v°& )!
t#° (°w °&°ctr)($cs ’)du&°, t#°( 2)u
must not
$(sta&& t#°
ROM SIMM $(t) t#° ’)du&°.
². I! t#° !$r’war° r°v$s$)( &°v°& )! t#° ROM SIMM $( t#° )&d
°&°ctr)($cs ’)du&° $s
higher
t#a( t#° !$r’war° r°v$s$)( &°v°&
)! t#° (°w °&°ctr)($cs ’)du&°, t#°( 2)u
must
$(sta&& t#° ROM
SIMM $(t) t#° ’)du&°.
Exa’*&° 1: T#° ROM SIMM !$r’war° r°v$s$)( &°v°& $s A.01.0±
a(d t#° !$r’war° r°v$s$)( &°v°& )! t#° °&°ctr)($cs ’)du&° $s
A.01.04. Y)u w)u&d us° t#° °&°ctr)($cs ’)du&°
without
t#°
ROM SIMM $(sta&&°d.
Exa’*&° ²: T#° ROM SIMM !$r’war° r°v$s$)( &°v°& $s A.01.05
a(d t#° !$r’war° r°v$s$)( &°v°& )! t#° °&°ctr)($cs ’)du&° $s
A.01.04. Y)u w)u&d us° t#° °&°ctr)($cs ’)du&°
with
t#° ROM
SIMM $(sta&&°d.
Removal
The electronics module is a fieldĆreplaceable part. You do not need to
open it. If it is faulty, exchange it for a new one.
1.
R°’)v° t#° r$"#t °(d3c)v°r
'
*a"° 8311.
².
D$sc)((°ct t#° !r)(t3*a(°& ass°’b&2 !r)’ t#° ’a$( PCA.
±.
U(scr°w t#° c)v°r *&at° at t#° bac% )! t#° Pr$(t°r, a(d r°’)v° $t.
4.
R°’)v° )(° scr°w ³$t°’ 1´ a(d was#°r ³$t°’ ²´ !r)’ t#° bac% c)v°r.