Printronix P4280, Maintenance Manual

Page: 32 / 298

3–6 Troubleshooting
Ham. Coil Open *
Instruction Indication Yes No
1.
Set power switch to O (off).
Wait 15 seconds. Set power
switch to 1 (on).
“Ham. Coil Open * ” message. Step 2. Return printer to
normal operation.
2.
Press the CLEAR switch.
“Ham. Coil Open * ” message. Step 3. Return printer to
normal operation.
3.
Run a diagnostic self–test
(page 3–27).
“Ham. Coil Open * ” message. Step 4. Return printer to
normal operation.
4.
Remove the shuttle cover
(page 5–24).
—
Step 5.
—
5.
Install a magnet across the
hole in the base casting
where the cover open sensor
is mounted.
—
Step 6.
—
6.
Run a diagnostic self–test
(page 3–27) and observe
where the non–printing
hammer is located.
—
Step 7.
—
7.
Reverse the hammer bank
flex circuit cables in the
connectors on the base
casting.
— Step 8. —
8.
Run a diagnostic self–test
(page 3–27). Observe where
the non–printing hammer is
located. (NOTE: Hammer no.
48 is a permanently
non–printing hammer. Keep
this is mind when reversing
cables.)
Position of the non–printing
hammer remains the same. Replace the
shuttle frame
assembly (page
5–72) then go to
step 9. If the non–printing
hammer is now on
the other side of
the hammer bank,
replace the
mechanism driver
PCBA (page
5–48) then go to
step 9.
9.
Return the hammer bank flex
circuit cables to their correct
connectors on the base
casting. Run a diagnostic
self–test (page 3–27).
“Ham. Coil Open * ” message. Replace both
hammer bank
cable assemblies
(page 5–8). Return printer to
normal operation.