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Helpful Hints on a Couple of New Printers

6 Mar, 2002 By: Steve Geishirt imageSource

Helpful Hints on a Couple of New Printers

Working on
a new printer, I often find myself saying, "I wish I could already know the
quirky areas of the machine rather than stumbling across them, but I guess
that’s just part of the learning curve on new printers."Well today, I have
a treat for you. We have recently gone through a couple of new products and
found some "quirks" that will likely save you several hours of head
scratching and under you breath mumblings.

9000 HV Contacts Can Cause 13.20 Paper Jam

What does
the High Voltage Power Supply (HVPS) have to do with paper jams?

many would say, but recently after reinstalling a HVPS into a 9000 printer, we
started getting instant 13.20 paper jams. What could be going on? After checking
for paper that may have been left in the machine and verifying the flags were
all right, I opened the Service Manual (OK, I was really stumped). 

One of the
steps in the service manual is to verify the proper seating of the leaf springs
under the HVPS. After removing the HVPS, I found that one of these leaf springs
was bent to the right (see figure 1) and out of the case. These leaf springs
should be to the left over the case, so when you reinstall the HVPS, the
contacts on the board touch the leaf springs. These contacts are labeled TB1009
and TB1010 on the HVPS (see figure 2).

What do
these contacts have to do with a paper jam problem? They monitor pressure roller
bias connections between the fuser and HVPS. These connections are routed
through the fuser connectors and complete the fuser wrapping jam detection
circuit. The wrapping jam detection circuit is an arm on a solenoid that
physically contacts the pressure roller when this check is done. It compares the
checked value to the applied value for differences. If they differ, the circuit
determines that a wrapping jam has occurred and stops the printer (a wrapping
jam is when paper wraps itself around the pressure roller). If you get the 13.20
error and really are having trouble figuring it out, check for paper wrapped
around the pressure roller. Then, check these contacts and leaf springs under
the HVPS.


Follow the
below steps to get to this area of the printer:

1. Remove
the rear cover, by removing 7 gold screws and 2 silver screws in the wrap around
panel on right side.

2. Remove
the HVPS. (figure 3)

a. Disconnect 2 cables-Green arrows.

b. Remove 3 screws-Red arrows.

c. Unlatch 1 tab-Yellow arrow.


This will
expose the springs, (figure 1) and contacts on the HVPS (figure 2).


Figure 1: Yellow - Correct , Red - Incorrect

 Figure 2, Contacts TB1009 & TB1010

Figure 3: HVPS Removal

Now that we
understand a quirk with the new HP 9000 that can cause a headache without even
knowing it happened, (until power is applied) let’s move on to the quirk that
can happen with the HP 1200/1220.

The HP LJ 1200 HV Connectors

technicians out there will laugh when they hear this story. Well, I didn’t
until days later. I hope that this article will save you the time that I spent
troubleshooting this problem. It all started when an HP LJ 1200 printer came in
for repair with a flashing amber error light. This light, when flashing,
indicates a general error such as paper out, paper jam, door open or incorrectly
installed toner cartridge.

I began
troubleshooting by checking all the sensor flags, which were all fine and moving
freely. Then, the door open switch was checked, followed by the toner cartridge
with no problems found. HP technical support was contacted and they suggested
that the motor could be the cause of this problem or the formatter could be
giving a false error. Both were changed with no effect. The engine control board
was also changed in a shot-gunning attempt with no change. However, upon
reinstallation, it was noticed that the HVPS contacts J301 and 
J304 could be cross connected.

The manual
was once again referred to and guess what, yes, the contacts were in fact hooked
up in reverse causing the printer to not recognize the toner cartridge (see
figure 1 and 2 for the correct and incorrect connections). Upon further
investigation, the customer had admitted to trying to fix the printer himself
for a separate problem, and not knowing which wire went to where, he assumed it
didn’t matter. When connecting these wires, both are red and both connect the
exact same way, but you must make sure not to cross them as they go straight up
to their appropriate connectors (see figure 1 and 2 for the proper and improper

To access
this area of the printer:

1. Open the
toner cartridge door.

2. Remove
the left side panel (as looking from the front).

3. Remove
the 2 screws as indicated by arrows in figure 3 and remove the rear panel.


Figure 1: Correct

Figure 2: Incorrect

Figure 3: Remove Screws

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