TechNote  40T-041

4410 / 4440  Series

4400 series +5V Problems
8/28/95 Ed Palmer

Models: 4410, 4440, 4470, 4490

Summary:
 Noise from the speaker, random malfunctions, and random displays.  The printer may also lose it's configuration while online, or become stuck in the power on self test.  The 4470/90 may have a dim display and the keys may not beep when pressed.

Some possible faults displayed:
4410 / 40: 020, 420, iP
4470 / 90: Fault:NV Cksum, Fault:SVTM Reset, Self Test, Loading..... Wait

Resolution:
 


CAUSE: An undercurrent condition on the +5 volt line.  This may be caused by the
cable that runs from the power supply to the main logic motherboard.  Typically, 
the pin on the +5 V line on the cable connector will be fried and there will be 
no damage to the power supply.  If damaged, replacement of this cable will usually 
resolve the problem.  Reseating the cable may be a temporary fix.  If the power 
supply connector is damaged, the power supply must be replaced.

CHECK:

* 4410/40 with SPSR
Check Cable Assembly 8 (44A505271-G09) running from SPSR P3 to  SMMB P3.

If the header connector on the power supply module is damaged, the entire module 
cage must be replaced.  [44D416267-G03 for the 4440, 44D416267-G04 for the 4410]


* 4410/40XT with SPSC
Check Cable Assembly 8.  It runs from SPSC P5 to  SMMB P3.  The old style 
[44A505271-G31]  cable is a gray ribbon cable.  The new style [44C506730-G02] 
cable is made of individual 16 AWG wires.

Insure the replacement cable is the new style.  Old style cables may still be in 
various supply systems.

* 4470/90 with SSSC
Check the cable running from SSSC P1 to  SMBP P3 [44A509082-G03]

If the header connector on the power supply module is damaged, the entire module 
cage must be replaced.  [44D416267-G05]

* 4470/90XT with SSPS
Check the cable running from SSPS P3 to SMBP P3 [44A508765-G01]

NOTE: If the printer was losing configuration, or if it acts strange after 
replacing the cable, NVRAM may have been corrupted.  ISU the printer with the 
Intialization switch.

NOTE: Why does the beeper make strange noises?
The control panel uses a transistor  and a diode to shift down the 555 timer 
controlling the beeper when the +5V bus drops below +4V.  This prevents the 
beeper from whimpering on power down.  If there is an undercurrent condition 
on the +5V bus, this circuit does not operate correctly.

Specifications subject to change without notice.
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