Index Basic Servicemanual v 3.0
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Our problem was on hammer six.
In below table you can see that it can be a result of driving circuit no U38.
NOTE!
To go further and check it is necessary to have a good knowledge in computer hardware and a proper
oscillochope with a probe available. Faulty handling on the board with power may damage the board
and are not covered by warranty.
For a fault on hammer 6 (our example) check the in signal (pin 24+24) and out signal (18+23). These pins
shall be on a logic 0, (below 1,8 V) after power on of the unit.
After repairing a printinghead run the self-test again, POWER ON+ON LINE and then ON LINE/OFF LINE.
Check the printout and if necessary, adjust the impact level and the vertical alignment on the printer
via the support software.
Hammer #, Type Transistor Driving circut Name on
MTP 3055E (x13) UDN2916 (x7) Circuit diagram
No:1 Negative T4 U35 in 1+44 out 3+6 Mag-B
No:2 Positive T3 U35 in 24+25 out 18+23 Mag-A
No:3 Negative T6 U36 in 1+44 out 3+6 Mag-D
No:4 Positive T15 U41 in 24+25 out 18 +23 Mag-M
No:5 Negative T14 U40 in 1+44 out 3+6 Mag-L
No:6 Positive T13 U40 in 24+25 out 18+23 Mag-K
No:7 Negative T12 U39 in 1+44 out 3+6 Mag-J
No:8 Positive T11 U39 in 1+44 out 3+6 Mag-I
No:9 Negative T9 U38 in 24+25 out 18+23 Mag-G
No:10 Positive T10 U38 in 24+25 out 18+23 Mag-H
No:11 Negative T7 U37 in 24+25 out 18+23 Mag-E
No:12 Positive T8 U37 in 1+44 out 3+6 Mag-F
No:13 Negative T5 U36 in 24+25 out 18+23 Mag-C
Test Printinghead
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