Faulty Led - Star Micronics WinType 4000 Technical Manual

TROUBLESHOOTING

3.15 Faulty LED

Step
1 (Initial Check)
Are any parts dirty, broken, malformed, incorrectly
installed or different from those listed in the specifica-
tions?
• Principle Parts to be Checked:
(1) LED PWB, (2) MCU PWB,
(3) LVPS assembly, (4) Harness assembly LED
2 (Check that power is supplied to the LED.) *1
Is a voltage of 5VDC supplied between P/J32-
2PIN↔P11-7PIN?
3 (Check that there is an ON signal on the Ready-LED.) *1
Is a voltage of 5VDC supplied between P/J32-
1PIN↔P/J32-2PIN when the printer is ready, and is
the voltage 0VDC when there is an error?
4 (Check that there is an ON signal on the Error-LED.) *1
Is the voltage 0VDC between P/J32-3PIN↔P/J32-
2PIN when the printer is ready, and is a voltage of
5VDC supplied when there is an error?
5 (Check the LED harness assembly.)
Is there continuity between J32↔J321?
*1: Be sure the EP toner cartridge is installed and the front cover assembly is securely closed.
Check
– 146 –
Remedy
YES
Replace the part or
install the part
correctly.
See step 3.
See step 4.
See step 5.
Replace the LED
PWB.
NO
See step 2.
See section 3.1
Faulty LVPS
Assembly 5VDC.
Replace the MCU
PWB.
Replace the MCU
PWB.
Replace the LED
harness assembly.