Printer will only photocopy a document much smaller than the original and only in purple

[Jude64]

There have been no error messages. All I have done is to put a new ink cartridge in yesterday, after which it worked fine.

The first photo copy today was perfect, but subsequent ones are really small and only in purple, not black

[Riddle_Decipher]

@Jude64

Welcome to HP Forums,

Let's get straight to it, shall we..

I have just the right steps to resolve your concern, I recommend you start with a firmware upgrade: Click here for steps.
And does this happen while printing as well as while using the copier?

Once done, go through the below steps: 

Step 1: Change copy settings (Printers with touchscreen or menu-based control panels)

Changing the copy settings from the printer control panel might improve copy quality.

1. Touch Copy, Copy Document, or Copy Photo on the printer control panel, and then select any available basic settings that apply to your copy job.

2. Touch Settings or the gear icon .

      NOTE:

   You might need to scroll down the control panel screen to access all settings. Available settings vary by printer model.

   • Paper Type: Select the type of plain or photo paper you are making the copies on.

   • Quality: Select an available copy quality level.

   • Lighter/Darker or Contrast: If the original is faded or too saturated, make the copy lighter or darker.

   • Optimize or Enhancements: Select the type of item you are copying to improve quality, such as sharpening text and image edges or improving faded colors in photos.

   • HP Copy Fix: Automatic copy quality and skew adjustment tool.

   • Save Current Settings or Set as New Defaults: Retains the selected settings for future copy jobs.

3. Touch or press the Back icon  or OK.

4. Load the original document or photo, and then start a copy job.

If the issue persists, continue to the next step.

Step 2: Reset the printer and check the power source

Reset the printer to calibrate the scanner mechanism, and then check the power source to confirm the printer is getting enough power to operate the copier.

1. Press the Power button to turn on the printer, if it is not already on.

2. With the printer turned on, disconnect the power cord from the printer.

3. Disconnect the power cord from the power source, and then wait 30 seconds.

4. If you previously connected the power cord to a power strip or multi-plug outlet adapter, reconnect the cord directly to a wall outlet to ensure the printer is getting enough power.

5. Reconnect the power cord to the rear of the printer, and then turn on the printer.

6. If you have an HP DeskJet 3700 series printer, calibrate the scanner after resetting the printer.

7. Load the original document or photo, then start a copy job.

   • If the issue persists, connect the printer power cord to a different wall outlet to determine if the original outlet is causing the issue.

   • If the issue persists with a different wall outlet, continue to the next step.

Step 3: Troubleshoot ink or toner cartridge issues

Ink or toner cartridge issues can cause unsatisfactory copy quality. Go to HP Customer Support, type your printer model number if necessary, and then search for 'print quality' to find the Fixing Poor Print Quality document.

If you feel I was helpful, simply click on Accept as Solution to help the community grow,

That said, I will have someone follow-up on this to ensure you've been helped,

Just in case you don't get back to us within 24 - 48 hrs, and have a good day, ahead.