Error: Left Jetstack Heater

This is a PEST (Print Engine Self Test) error = Printhead Left jetstack disconnect. The Left Jetstack is not drawing the expected power from the power supply.

Devices sharing the printer's AC outlet or circuit, such as another printer, coffee maker, space heater, may be placing intermittent demand on the AC circuit. This sudden demand creates a momentary AC voltage sag that causes the PEST test to fail. Verify the AC power source prior to replacing any parts for this error. Xerox recommends this printer be plugged directly into the wall outlet and not into a surge protector, battery backup or multi-outlet strip.

If none of these conditions exist, then the printhead is bad and will need replaced.

046K00530 Printhead (8500/8550)

Here's what I found in my service manual
37,0XX.xx PEST Heater Faults
An heating error has occurred. The following troubleshooting procedure applies to these errors:
37,002.47 The Left Jetstack is drawing less power than expected.
37,003.48 The Right Jetstack is drawing less power than expected.
Now my service manual was written 4 years ago. I couldn't find the specific code you listed above, but these seem to come closest to answering your error code.

37,002.4x - PEST_FAULT_JSL_HEATER_DISCONNECT

Try this
PEST - Left jetstack disconnect.The left jetstack is not drawing the expected power from
the supply.
1. Run the printhead Left Jetstack Heater test.
2. Verify printhead wiring.

Hi outonalimbwi:
Here is your problem.
37,006.42: PEST - Drum disconnect. The drum heater is not drawing the expected power from the supply.

Troubleshooting Procedure
Step Questions and Actions Yes No
1 1. Run the appropriate diagnostic test:
37,002.47 = Left Jetstack Heater
37,003.48 = Right Jetstack Heater
37,004.40, 37,005.41 = Reservoir Heaters
37,006.42 = Drum Heater
37,008.44 = Preheat Heater
37,009.45 = (8500/8550) All ink melters
= (8400) Ink Melt 1
37,010.46 = (8500/8550) Ink Melt 1
= (8400) Ink Melt 2
37,011.47 = (8500/8550)Ink Melt 2
= (8400) Ink Melt 3
37,012.48 = (8500/8550)Ink Melt 3
= (8400) Ink Melt 4
37,013.48 = (8500/8550)Ink Melt 4
2. Did the test pass?
Go to Step 3. Go to Step 2.
2 1. Check the wiring running from the component to the printhead.
2. Is the wiring damaged or not working properly?
Replace the wiring harness.
Replace in the following order:
■ Drum assembly
■ Preheater
■ Printhead
■ Ink loader

This is an electrical error in the printhead 650-4303-00. Unfortunately it is expensive.

Whit
Item, Inc.

37,002.47: PEST Error - Printhead Left jetstack disconnect. The left jetstack is
not drawing the expected power from the supply.

Could be a connector came unplugged. Could also be ink spill on circuit board, causing it to go haywire.

37,0XX.xx Errors - PEST Faults
AC power supplied by power sources such as uninterruptible power supplies
(UPSs) or DC-to-AC inverter systems may not supply correct voltage to
properly power up the printer. Likewise, other devices sharing the same AC
circuit can cause AC voltage sags that cause the printer to fail its AC heater
PEST tests (Print Engine Self Test). The printer may produce any of the
following disconnected heater errors:
■ Printhead jet-stack 37,002.47 or 37,003.48

Error Messages and Codes
■ Reservoir heater, 37,004.40 or 37,005.41
■ Drum heater error 37,006.42
■ Preheater error 37,008.44
■ Ink melters errors 37,009.45 thru 37,013.40
The printer includes several heaters powered by AC. The printer itself can
power up despite insufficient or irregular AC voltage but it may fail its AC
heater tests. This is due the test not measuring sufficient current flowing
through the heater at the moment the test runs.
Devices sharing the printer’s AC circuit shared, such as a laser printer, a
coffee maker, or a space heater, may be placing heavy intermittent demand
on the AC circuit. This sudden inductive demand creates momentary AC
voltage sag that causes the PEST test to fail.
Verify the AC power source prior to troubleshooting these errors. For wiring
diagrams to aid in diagnosing PEST faults, see “Wiring Diagrams” on
page 10-1.
8400/8500/8550/8560 PEST Description
37,001.46: Generic PEST error. Something went wrong during the PEST process.
37,002.47: PEST Error - Printhead Left jetstack disconnect. The left jetstack is
not drawing the expected power from the supply.

From the service manual:

37,002.4x - PEST_FAULT_JSL_HEATER_DISCONNECT
PEST - Left jetstack disconnect.The left jetstack is not drawing the expected power from
the supply.
1. Run the printhead Left Jetstack Heater test.
2. Verify printhead wiring.

Yes, could be faulty printhead, but could be faulty power supply as well.

I have the full service manual available if you need it. Please take a moment to give this solution a rating of fixya. Thanks!

37,002.47: PEST Error - Left jetstack disconnect. The left jetstack is not drawing the expected power from the supply.

Try turning the printer off for 10 minutes or so, then turn back on. If the error happens again you will need to have the printhead replaced.

Make sure the printer is plugged directly into a wall outlet, not a surge protector or multi-outlet strip. These devices will not let enough power reach the machine, causing most of the 37 series of errors.

The technical error message means:
The Printhead Left jetstack heater is not drawing the expected power from the power supply.

Possible solutions:
1) Make sure the AC plug is plugged into the wall and not a UPS or surge protector. Other things such as another printer, coffee maker or other electrical devices on the same circuit could cause a sag in AC demand from the Phaser, causing it to fail it's PEST (Print Engine Self Test).

2) Verify that the wall outlet's circuit is capable of delivering the correct amount of current to the Phaser, if it does, check how many other electrical devices (aka a desklamp, radio, etc.) are on the circuit.

3) If it's out of warranty, reseat the cables from the Printhead to the Electronics Module. If it's in warranty, place a service call on the unit.