Mac running OS9

Do you mean E,2,2 indication? It means Carriage error.
Replace the following parts in the given oder
Timing **** strip film Logic board ***'y Carriage motor (Main unit) Carriage unit (Main unit)

Error code 6A00 indicates an error occurred in the AP motor during purging operation. You need to replace sheet feed unit, logic board assy and purge unit to fix it. Before replacement of the logic board assy, check the waste ink amount (by service test print or EEPROM information print). If the waste ink amount is 7% or more, also replace the ink absorber kit when replacing the logic board assy.

Error 5100 means an error occurred in the carriage encoder signal. Error 6A00 means an error occurred in the AP motor during purging operation. To fix these two errors you need to replace:
- Carriage unit (QM2-2922)

- Timing **** strip film (QC1-6394)

- Logic board ***'y (QM2-3078)

Before replacement of the logic board ***'y, check the waste ink amount (by service test print or EEPROM

information print). If the waste ink amount is 7% or more, also replace the ink absorber kit (QY5-0146) when
replacing the logic board ***'y.

- Carriage motor (QK1-1500)

-Sheet feed unit (QM2-2916)
-Purge unit (QM2-2925)

Blinking 2 time [5100] CARRAIAGE ERROR
An error occured in the carriage encoder signal.
May need to replace the following parts :
- CARRIAGE UNIT
- TIMING **** STRIP FILM
- LOGIC BOARD
- CARRIAGE MOTOR

How many times does it blink... 2, 3, 12....

2 times Carriage error [5100] An error occurred in the carriage encoder signal. - Carriage unit (QM2-3753)
- Timing **** film (QC1-9542)
- Logic board (QM2-3827)
- Carriage motor (QM2-3872)
3 times Line feed error [6000] An error occurred in the LF encoder signal. - Timing sensor unit (QM2-3878)
- Timing **** disk film (QC1-9597)
- Feed roller (QL2-1407)
- Logic board (QM2-3827)
- Paper feed motor (QM2-3873)
4 times Purge cam
sensor error
[5C00] An error occurred in the purge unit. - Purge unit (QM2-3754)
- Logic board (QM2-3827)
5 times ASF (cam)
sensor error
[5700] This error takes place when feeding paper from the
ASF after an error occurred in the ASF cam sensor.
- Sheet feed unit (QM2-3762)
- ASF_PE sensor board (QM2-3877)
- Logic board (QM2-3827)
6 times Internal
temperature
error
[5400] The internal temperature is not proper. - Logic board (QM2-3827)
- Carriage unit (QM2-3753)
7 times Ink absorber
full
[5B00,
5B10,
5B01,
5B11]
The ink absorber is full.
Error codes:
Overseas:
5B00: Main ink absorber
5B10: Borderless-print ink absorber
Japan:
5B01: Main ink absorber
- Ink absorber kit (QY5-0178)
1-5
Note: Before replacement of the logic board ***'y, check the ink absorber counter value (by service test print or EEPROM information
print). If the counter value is 7% or more, also replace the ink absorber kit (QY5-0178) when replacing the logic board ***'y, or
register the current ink absorber counter value to the replaced new logic board instead. [See 3-3. Adjustment / Settings, (9)
Service mode, for details.]
2-3. Other Error Messages
5B11: Borderless-print ink absorber
8 times Print head
temperature
rise error
[5200] The print head temperature exceeded the specified
value.
- Print head (QY6-0070)
- Logic board (QM2-3827)
9 times EEPROM
error
[6800] A problem occurred in writing to the EEPROM. - Logic board (QM2-3827)
10 times VH monitor
error
[B200] The internal temperature exceeded the specified
value.
- Print head (QY6-0070)
- Carriage unit (QM2-3753)
- Logic board (QM2-3827)
12 times PG position
error
[5C10] An error occurred in the PG motor during purging
operation.
- Sheet feed unit (QM2-3762)
- Logic board (QM2-3827)
- Purge unit (QM2-3754)
15 times USB Host
VBUS
overcurrent
[9000] The USB Host VBUS is overloaded. - Logic board (QM2-3827)
19 times Ink tank
position sensor
error
[6502] None of the ink tank position is detected. - Spur base unit (QM2-3750)
- Logic board (QM2-3827)
20 times Other
hardware error
[6500] The PCI bus error is detected by the ASIC. - Logic board (QM2-3827)
22 times Scanner home
position error
[5010] The scanner unit cannot detect the home position, or
the scanner unit warming-up is not performed
properly at power-on.
On the LCD, "Scanner is not operating correctly." is
displayed.
- Scanner unit (QM2-3775)
Alarm and Power
LEDs lit
ROM error,
RAM error
A flash ROM or RAM checksum error occurred at
hard-power-on.
- Logic board (QM2-3827)

Purge cam sensor error [5C00] An error occurred in the purge unit. - Purge unit
- Logic board prbelom

There is a round clean out door accessed from the front of your unit. Some models you have to take the lower panel off entirely to clean it out. It unscrews and probably there is anything and everything you can imagine clogging the pump inlet....thus the error message "PUMP ERROR" THe unit's error code may manually have to be deactivated in the control panel to reset the unit to normal operation.

The message indicates a controller or print engine error has been detected. It's the internal electronic/logic board failing.

If power cycling or turning it OFF/ON does notclear the error message, service is required as the logic board needsreplacement.

here's a link for certified service center for your product.

If it really is a "logic board" problem, then it's time to responsibly recycle the printer, and to purchase a brand-new printer; hopefully, you can find one that uses the same ink-cartridges as your current printer.

A "pro" would charge you $50 to $100 to _look_ at it, with _no_ guarantee of being able to fix it; instead, invest that money in the new printer, which you _know_ will work.

AP position error [6A00] the Sheetfeed unit or the main logic board has failed need to purge unit. Give it a good tank cleaning, possibly replace cartridges. Is it still under warranty? Have you contacted Canon?