stobby2

asked Sep 30, 2009 at 10:20am
Hp HP Color LaserJet 4700

hp laserjet 4700

Hi Guys
Problem with 4700 when switched on it goes through memory count to 256mb and thats it!!! will not go further will not initialise or calibrate. Never has this problem. Any ideas
roger
Maybe is is waiting and looking for more memory that it thinks is there, but can't find it.
Did you try reseating the memory modules
by rohmell on Sep 30, 2009 at 2:08pm Add comment
many thanks for that
new machine to me where is the memory located on this model
cheers
roger
by stobby2 on Sep 30, 2009 at 11:39pm Add comment
Several places to start. If the control panel display remains blank, random patterns display, or
asterisks remain on the control panel display, perform power-on checks to locate the cause of the
problem. During normal operation, the main cooling fan begins to spin briefly after the printer power is turned on. Place your hand over the holes in the rear cover, above the formatter. If the fan is operating, you will feel air passing out of the printer. You can also lean close to the printer and hear the fan operating. When this fan is operational, the DC side of the power supply is functioning correctly. After the fan is operating, the main motor turns on (unless the top cover is open, a jam condition is sensed, or the paper-path sensors are damaged). You should be able to visually and audibly determine if the main motor is turned on. If the fan and main motor are operating correctly, the next troubleshooting step is to isolate print engine, formatter, and control panel problems. Perform an engine test (see Engine test below). If the formatter is damaged, it might interfere with the engine test. If the engine test page does not print, try removing the formatter and then performing the engine test again. If the engine test is then successful, the problem is almost certainly with the formatter, the control panel, or the cable that connects them. If the control panel is blank when you turn on the printer, check the following items.
1.Make sure that the printer is plugged directly into an active electrical outlet (not a power strip)
that delivers the correct voltage. 2.Make sure that the power switch is in the on position. 3.Make sure that the fan runs briefly, which indicates that the power supply is operational. 4.Make sure that the control panel display wire harness is connected. 5.Make sure that the firmware flash memory card and the formatter are seated and operating correctly.
6. Remove any HP Jetdirect or other EIO cards, and then try to turn the printer on again.
To verify that the printer engine is functioning, print an engine test page. Use a small pointed object to depress the test page switch located on the rear of the printer, (Top right of second set of vent holes on rear of machine as viewed from rear). The test page should have a series of horizontal lines. The test page can use only Tray 2 as the paper source, so make sure that paper is loaded in Tray 2.
A cold reset unlocks menus that have been locked and resets control panel variables. However, it
does not clear the values in the SERVICE menu (such as the serial number and page counts).
To perform a cold reset
Warning! Performing a cold reset erases all of the EIO card information.
1.Turn the printer on. 2.As the printer performs its power-on sequence, press and hold the check mark key until all three lights on the control panel are lit. 3.When Select Languages displays on the control panel, press the up arrow key until Cold Reset displays on the control panel. 4.Press the check mark key. The printer performs a cold reset and then continues its power-on sequence.
This info was extracted from the hp 4700 service manual and we accept no responability for any inaccuracies or problems arrising from the use of such information passed along.
by aerolaser on Oct 1, 2009 at 7:56am Add comment


Got a similar problem in that the printer starts up then begins to calibrate then stays in calibration mode, can't get it to do anything. Have checked the toners and cleaned it but still no joy.

Would a cold reset help?

by unknown on Oct 20, 2009 at 6:48am Add comment
It might, and it does not cost anything to try, .
by Stephen on Oct 20, 2009 at 10:25am Add comment
cured the problem with my machine. Removed the formatter board and desoldered the battery left for a few minutes, refitted battery and machine fired up fine, just had to reset clock etc. Worth a try, only takes a couple of minutes
rog
by stobby2 on Oct 20, 2009 at 10:56am Add comment
i have the same problem at this time, i have try replacing the firmware compact flash card with no succes after reseeting mem. cards,will try aerolaser solution and keep you guys posted on that
by novy on Dec 2, 2009 at 7:33pm Add comment
I am trying to fix a 4700 right now with a blank lcd

The only thing that I have not replaced because HP shipped us a 220volt low voltage power supply, instead of a 100 volt...

I have no heartbeat or cat5 lights on the formater...because it isnt getting power.

by garyp53161 on Jan 13, 2010 at 5:28pm Add comment
Good New!! i tried "stobby2" solution, taking out formatter and unsolder one end of the battery and leave it "off" for a minute and resolder the terminal and machine power-up fine.In my case power on was fine,machine was locking-up after memory check, heartbeat light was out and yet fuser got its temp. up.Engine test work (smal hole on the back)

"""CAUTION""""NO MANUFACTURER RECOMMEND SOLDER OR DESOLDER ANY RECHARDABLE BATTERY AS HEAT MAY PROVOKE EXPLOSION, SO BE AWARE AND PROTECT YOURSELF
many thanks to stobby2
by novy on Jan 22, 2010 at 2:07pm Add comment
Good New!! i tried "stobby2" solution, taking out formatter and unsolder one end of the battery and leave it "off" for a minute and resolder the terminal and machine power-up fine.In my case power on was fine,machine was locking-up after memory check, heartbeat light was out and yet fuser got its temp. up.Engine test work (smal hole on the back)

"""CAUTION""""NO MANUFACTURER RECOMMEND SOLDER OR DESOLDER ANY RECHARDABLE BATTERY AS HEAT MAY PROVOKE EXPLOSION, SO BE AWARE AND PROTECT YOURSELF
many thanks to stobby2
by novy on Jan 22, 2010 at 2:08pm Add comment
Glad l could help, but re comment on desoldering rechargeable batteries. These are BUTTON BATTERIES installed on PCBs. This is perfectly safe so long as it is done correctly. common fault where Batteries fail and need replacing and quite often these batteries are soldered in hence have to be desoldered to be replaced.
roger
by stobby2 on Jan 23, 2010 at 12:50am Add comment
have a hp laserjet printer will not start up, I moved it from one end of the table to the other and it did not start up again.need some assistance.
by unknown on Dec 18, 2010 at 3:37pm Add comment
is there any power? any display? any motor noises. If you can give a bit more info l may be able to assist
rog
by stobby2 on Dec 19, 2010 at 5:36am Add comment
Make sure the power cord is securely plugged into the printer.
by moe on Dec 19, 2010 at 8:42am Add comment
My word documents will not print unless I press the green button (check mark) several times.
by unknown on Jan 24, 2011 at 6:53am Add comment
What messages are displayed on the Operator Panel?
by Stephen on Jan 24, 2011 at 10:31am Add comment
De soldering the battery worked for us to! As before it stayed on the 256MB ******** Screen.

Thanks
by unknown on Feb 7, 2012 at 3:29am Add comment
Any suggestions! I am not sure what have been tried already.
Thanks Ckay
by unknown on Apr 16, 2012 at 11:21am Add comment