ELCOM Euro-500 Handy Series, Руководство по обслуживанию

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Euro-500TX Handy © Elcom, s. r. o.
Service manual
62
Euro-500TX Handy © Elcom, s. r. o.
Service manual
63
• step-motor feeds the paper tapes, but the print is incomplete or none
incorrect PR-CLK signal – check the connexion
– measure the signal presence on the inlet #35 of U6
circuit during the test #200
incorrect LDC-DATA signal – 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)
signals STB1 – STB4 and P-LATCH are incorrect
?
– check the connexion
– measure these signals during the test #200
– replace the U5 circuit
not functional or damaged VH power supply – check the connexion
– 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)
printer head electronics is destroyed – replace the printer
• the printer prints everything into one micro-row – printer step-motor doesn’t move (dense printing)
incorrect signals PA1, PB1, PA2N, and PB2N
– 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
incorrect VCC1 voltage value – run test #910 and measure the VCC1 voltage; if the
voltage is wrong, follow chapter 6.1
printer step-motor is destroyed – replace the printer
jammed printer cylinder mechanism – replace the printer
lint (jammed paper) in the paper input slit – clean the printer
• indistinct printing
incorrect VH voltage value – use the test #910 to check the VH voltage value
• the paper tape is winded unreliably or not at all onto the winding reel
incorrect placement of the winding reel – check the placement
incorrect placement of the winding motor – check the placement
winding motor rubber band is damaged – repair or replace the printer
incorrect or incomplete connexion of the winding motor – check the connexion of the wind-
ing motor to the W-M connector
damaged winding motor – replace the winding motor
damaged winding motor control circuit – 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
• the printer report absence of some of the paper tapes
incorrect PS1 or PS2 signal – 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
mechanical damage or malfunction of external paper tape sensor (journal) – replace the ex-
ternal sensor
mechanical damage or malfunction of internal paper tape sensor (receipt) – replace the
printer