Gasboy 9800Q Series Diagnostic Manual - Manual (Page 61)

Replacement Instructions
01/28/04 5-5
REPLACING THE CPU PCB
1.
Disconnect all cables [1] from the CPU PCB.
2.
If an optional RS-485 or Pump I/F PCB is installed, remove the two Phillips screws [2]. Pull
the optional PCB off of the CPU PCB.
3.
Remove the screws from the CPU PCB and unsnap PCB from standoffs.
4.
Remove the program IC from socket U18 [3] and the memory IC from socket U19 [4] of the
defective CPU PCB by gently prying with a slotted screwdriver.
5.
Install the old program IC and memory IC into sockets U18 and U19 on the new CPU PCB.
Be careful to observe proper pin orientation.
6.
Reverse Steps 1 through 3 to install the new CPU PCB.
7.
Verify that the switch settings on the new CPU PCB are correct. See the switch settings in
Section 3, Electronic Head Assembly for verification.