Magenta horizontal stripes on paper (approx 11 per page), what can I do to resolve?

AS I understand you have black stripes on the back side of the print, so if this is the case, the Image transfer cleaning blade need to be replaced. Part number is: Genuine Ricoh Aficio 2238C Transfer Belt Cleaning Blade Ricoh AD04-1081, AD041081

1. Open the Page Setup dialog by double-clicking the horizontal ruler or by clicking the dialog launcher (tiny arrow) in the bottom right corner of the Page Setup group on the Layout tab.
2. On the Paper tab, make sure the paper size is set to 11x17.
3. On the Margins tab, for "Multiple pages," select "Book fold."
4. Make sure the orientation is set to Landscape.
5. Click OK.

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If this is a laser printer, it sounds like you have either a defective drum or transfer belt. Drum would be my first guess.

NP6560 Main Specifications
Main Unit
Name: Canon NP6560
Type: Console
Platen: Stationary
Photoconductive material: Amorphous Silicon
Copying system: Electrostatic transfer system
Developing system: Toner projection system
Fixing system: Heat roller system
Acceptable copy stock: Paper drawer:17 to 24-lb bond (64 to 90 g/m2); plain paper
Stack bypass:17-lb bond to 110-lb index (64 to 200 g/m2); plain paper
(However, Keep in mind that the paper weight that can be used varies
depending on the type of the Sorter being used.
SADF tray : transparencies and labels
Acceptable originals: Sheets, books, and three-dimensional objects (up to 4.4-lb or 2 kg)
Maximum original size: 11" x 17"
Copy sizes: Paper drawer: STMT, STMTR, LTR, LTRR, LGL, and 11" x 17"
Stack bypass: 4 1/8" x 5 7/8" (horizontal placement) to 11" x 17"
Non-image areas: Leading edge: 1/4" (4.5 mm)
Left and right side: 1/16" (3 mm)
Trailing edge: 1/16" (2 mm)
Warm-up time: Approx. 6 minutes (at temp. of 68°F)
First copy time: Max. 2.8 seconds
[LTR size, direct copying, Manual Exposure Control, Drawer 1 (top
drawer) selected 1→1-sided mode]
Copy speed: Direct (100%) LTR 60 cpm
65 cpm (Accelerated mode)
LTRR 49 cpm
11"X 17" 30 cpm
LGL 40 cpm
STMT 60 cpm
STMTR 60 cpm
Reduction 11"x 17" → STMT 56 cpm (50%)
11"x 17" → LTR 48 cpm (64%)
11"x 17" → LGL 40 cpm (73%)
11"x 15" → LTR 48 cpm (73%)
LGL → LTR 49 cpm (78%)
Enlargement LGL → 11"x 17" 30 cpm (121%)
LTR → 11"x 17" 30 cpm (129%)
STMT → 11"x 17" 29 cpm (200%)
Magnification: Direct 1:1.000
Reduction 1:0.500 (11" x 17"→STMT)
1:0.647 (11" x 17"→LTR)
1:0.733 (11" x 17"→LGL/11" x 15"→LTR)
1:0.786 (LGL→LTR)
Enlargement 1:1.214 (LGL→11" x 17")
1:1.294 (LTR→11" x 17")
1:2.000 (STMT→11" x 17")
Zoom 1:0.490-1:2.040
7-8
Paper feeding system: Drawer 1, 2 (1,500 sheets x 2)
Drawer 3, 4 (550 sheets x 2)
Stack bypass (50 sheets; stack approx. 1/4" high)
Multiple copies: 1-999
Power source: 120 V, 60 Hz
Max. power consumption: Less than 2.0 kW
Dimensions (H x W x D): 46" x 25 3/8" x 28 1/2"
(1169 x 643 x 725 mm)
Installation Space (W x D): 40 5/8" x 28 1/2"
(1030 x 725 mm)
50 3/8" x 28 1/2" (1280 x 725 mm)
[With copy tray (option) attached and stack bypass auxiliary tray extended]
Weight: Approx. 462 lb (210 kg)
RDF (Standard equipment)
Originals: STMT to 11" x 17" size (STMT-size cannot be placed horizontally.)
Original tray: LTR 15-lb to 110-lb bond (52 to 200 g/m2)
11" x 17", LGL, LTRR, or STMT
15-lb to 32-lb bond (52 to 128 g/m2)
SADF tray: 11" x 17" to STMT
11-lb to 110-lb bond (38 to 200 g/m2)
Max. power consumption: 120 W
Original tray capacity: Original tray: 11" x 17" or LGL
50 sheets (20-lb bond or 80g/m2)
LTR, LTRR, or STMT
100 sheets (20-lb bond or 80g/m2)
SADF tray: 11" x 17" to STMT
1 sheet
Original replacement speed: 60 sheets/minute (LTR, horizontally placed)
Power supply: 24 V (supplied from main unit)
Dimensions (H x W x D): 6 7/8" x 25 3/8" x 21 1/4"
(174 x 643 x 539 mm)
Weight: Approx. 56.3 lb (25.5 kg)
These specifications are subject to change without notice.
8-1
ar
Energy Saver
Stop
Guide
Additional Functions
Start
Display Contrast
ii
? ? ? ? ? ? ? ? ?
Enter a ID number with the Number ( 1 - 0 )
keys.
MEMO: ? If you make a mistake entering an ID number, press
the C
Clear
key. Then, enter the ID number again.
? You cannot enter two identical ID numbers.
? If you enter and store "000000" in place of a current
ID number, that ID number is canceled.
? You can store up to 1,000 ID numbers.
4
Press the [OK] key.
If you want to store another ID number, repeat
steps 3 to 5.
5
After entering all the ID numbers to be stored,
press the ID key. The display returns to the ID
entry screen.
6
Canceling the ID Mode: Clearing All ID Numbers
If you clear all the ID numbers then you can make copies without having to enter an ID
number.
Press the Additional Functions , ID , Stop , and Additional Functions keys in that
1 order.
Clear
Guide
Additional Functions
Interrupt
Reset
Clear
Energy Saver
Stop
Guide
Additional Functions
Start
Display Contrast
iii
? ? ? ? ? ? ? ? ?
Press the [OK] key.
MEMO: ? If you want to stop all the ID#s from being cleared,
press the [C] key.
Press the [CLEAR ALL ID#s] key.
Press the [STORE USER ID#] key, then press
the [OK] key.
All the ID#s are cleared.
If you press the [OK] key, you will return to the
Standard mode.
MEMO: ? Storing all the ID#s under "000000" will also clear all
the ID#s.
2
3
4
iv
? ? ? ? ? ? ? ? ?
In the ID mode, the copier keeps track of the copy quantity made under each ID number (up to
999,999). You can view the copy total for each ID number in the touch panel display.
Press the Additional Functions , ID , Stop , and Additional Functions keys in that
1 order.
After pressing the [COPY TOTALS] key, press
2 the [OK] key.
Press the [?] or [?] key to check the copy totals
for a department. The copy totals can also be
displayed by entering the department number.
Press the Number keys ( 1 - 0 ) for a four digit
department number and it appears at the top of
the display. When you finish checking the copy
totals, press the [OK] key.
3
Copy Totals (Check Totals)
The following procedure describes how to clear the copy totals for all ID numbers to zero.
Copy Totals (Clear All Totals)
Press the Additional Functions , ID , Stop , and Additional Functions keys in that
1 order.
Reset
Clear
Energy Saver
Stop
Guide
Additional Functions
Start
Display Contrast
Reset
Clear
Energy Saver
Stop
Guide
Additional Functions
Start
Display Contrast
v
? ? ? ? ? ? ? ? ?
After pressing the [COPY TOTALS] key, press
2 the [OK] key.
Press the [CLEAR ALL TOTALS] key. 3
Press the [OK] key.
MEMO: ? To cancel clearing all totals, press the [C] key. 4
The copy totals for all ID numbers are cleared to
zero. If you press the [OK] key the display
requesting the entry of an ID number appears.
MEMO: ? You cannot clear the copy totals for ID numbers
individually.

Either your magenta cartridge is leaking out of the right corner or you have a defective magenta drum.
(maybe it got scratched when changing the cartridge?) If it's the magenta drum, you have to replace all the drums since they come in one unit. OEM part only.

Replace the magenta toner and clean the printer inside, see
Clean your laser printer safely.

Resolving white, light lines or streaks (eliminate light stripes)

From the printer, print the Troubleshooting Print Quality Pages.
With Troubleshooting highlighted, press the OK button.
Scroll to Print Quality Problems by pressing the Up or Down Arrow button. Press OK.

Scroll to Troubleshooting Print Quality Page. Press OK.
Evaluate the Light Stripes Test page for missing printhead jets (missing cyan, magenta, yellow or black color bars).

Clean the maintenance unit's wiper blade and empty the waste tray. A dirty maintenance drawer wiper blade can cause white lines and weak or missing printhead jets. Using a clean lint-free cloth or a paper coffee filter, gently clean the blade with a wiping motion across the entire length of the wiper blade.

if you use fast draft than you can take approx 150 else in any other prefrences it will give upto 120 pages per cartridge. so use proper setting as per the requirement.

Hi jbasset285: Your printhead may be bad do to third party ink.
Try these steps first.
Diagnosing Print-Quality Problems
The Troubleshooting Print-Quality Page provides a good overview of the most
common print quality problems. To print the Troubleshooting Print-Quality Page,
follow these steps:
1. From the Control Panel, scroll to Troubleshooting, then press OK.
2. Scroll to Print Quality Problems, then press OK.
3. Scroll to Troubleshooting Print Quality Page, then press OK.
The Troubleshooting Print Quality Page includes instructions for printing the
Eliminate Light Stripes test print. These instructions are also provided on the next
page of this manual. The Eliminate Light Stripes test print indicates individual weak
or missing jets or an obstruction in the imaging path that affects a vertical band down
the entire page. Also, you may see color variation from jet to jet on the Eliminate
Light Stripes test print. Some variation is normal, occasionally occurs, and usually
self-corrects within a few printed pages. If a print-quality problem is not resolved
with the information provided in the Diagnosing Print-Quality

I've refilled the toner cartridges a few times now and never had a problem with vertical streaks until recently. I refilled both the cyan and magenta and when I ran the test page I had dark vertical streaks on both sides. I fiddled around cleaning things, running cleaning paper through, changing reset resistors but to no avail so eventually decided to buy a replacement refurbished cyan cartridge since the streaks looked mainly blue and bingo... well almost now I just have very light magenta streaks. The issue is obvious when I compared the old and new cartridge, the replacement toner is a much duller cyan and is of the wrong consistency since once it's been in the printer everything gets covered in it which is why I think it causes the banding to occur. I'm just trying to work out now whether to try refilling the magenta again (v. messy) or just go for another refurbished cartridge (£34).