IBM PCjr Hardware Maintenance And Service page 46

Advanced POST Error Table (Part 3 of 4)
POST Error
Problem
Area What To Do
Page
No beep.
ERROR lYXX
Memory
Replace system
board. Repeat
advanced POST.
If same error,
go to PIC
"Power."
4-100-1
No beep.
ERROR 2000
Keyboard Replace
keyboard. Repeat
advanced POST.
If same error,
go to PIC
"Keyboard."
3-300-1
No beep.
ERROR 21XX
Infra-Red
Replace infra-red
receiver. Repeat
advanced POST.
If same error,
go to PIC
"Keyboard."
4-300-1
No beep.
ERROR 22XX
Keyboard Replace
keyboard. Repeat
advanced POST.
If same message,
go to PIC
"Keyboard."
3-300-1
"X" can be any number.
Before replacing any item, ensure that all internal cables are
correctly connected. Treat replaced items with care. You may
be asked to reattach them.
3-000-10 Start