ELCOM Euro-500 Handy Series Service Manual page 62

Euro-500TX Handy
• step-motor feeds the paper tapes, but the print is incomplete or none
incorrect PR-CLK signal
incorrect LDC-DATA signal
signals STB1 – STB4 and P-LATCH are incorrect
?
not functional or damaged VH power supply – check the connexion
printer head electronics is destroyed
• the printer prints everything into one micro-row – printer step-motor doesn't move (dense printing)
incorrect signals PA1, PB1, PA2N, and PB2N
incorrect VCC1 voltage value
printer step-motor is destroyed
jammed printer cylinder mechanism
lint (jammed paper) in the paper input slit
• indistinct printing
incorrect VH voltage value
• the paper tape is winded unreliably or not at all onto the winding reel
incorrect placement of the winding reel
incorrect placement of the winding motor
winding motor rubber band is damaged
incorrect or incomplete connexion of the winding motor
damaged winding motor
damaged winding motor control circuit
• the printer report absence of some of the paper tapes
incorrect PS1 or PS2 signal
mechanical damage or malfunction of external paper tape sensor (journal) –
mechanical damage or malfunction of internal paper tape sensor (receipt) –
62
Service manual
– check the connexion
– measure the signal presence on the inlet #35 of U6
circuit during the test #200
– check the connexion
– use the oscilloscope to determine the signal presence
on the B2 choke coil near the PR&DISP1 connector
(this signal is valid also for the display, so if this is the
cause, the display won't work as well)
– check the connexion
– measure these signals during the test #200
– replace the U5 circuit
– run test #910 and measure the VH voltage value
– check, event. replace T1 – T3, R1 – R4
– if accumulator powered, check, event. replace all
the parts of the Step-up circuit; check the VHSU
converter signal (24 V)
– replace the printer
– check the connexion
– use the oscilloscope to measure signals EN, PA1,
PB1, PA2N, and PB2N on the U17 outlet and signals
A, AN, B, and BN on the U17 inlet (during test #200)
– replace circuits U17, U8
– run test #910 and measure the VCC1 voltage; if the
voltage is wrong, follow chapter 6.1
– replace the printer
– replace the printer
– clean the printer
– use the test #910 to check the VH voltage value
– check the placement
– check the placement
– repair or replace the printer
–
ing motor to the W-M connector
– replace the winding motor
– check the W-MOT signal (run test #200 and use
multi-meter) on the R40 and also on outlet #16 of U5
circuit
– replace U5, T13, R40
– check the connexion
– check the presence of paper tapes and their proper
insertion into the slit
– voltage values for PS1 and PS2 signals shall be 0.6
V if tape is absent and over 4 V if the tape is present,
provided VCC1 power supply is functioning
ternal sensor
printer
© Elcom, s. r. o.
check the connexion of the wind-
replace the ex-
replace the