Samsung SCX-1100 Service Manual page 74

3-3-2-8 HEAD control part
1. Entire description
As part to drive INKJET HEAD, it is composed of ACLK,
AGATE, LDCS, LATCHCTL, PCLK, PDATA[3:0], PLOAD,
PENABLE signals for controlling Spitfire of CR B'D gener-
ating signal, which is driving Nozzle of Head, and
PH_ID[1:0] and OK2Print signals receiving from Spitfire.
Here,HEAD being used here is DOUBLE HEIGHT PRINT
HEAD, and MONO is configured with 208 NOZZLE, and
COLOR is with 192 NOZZLE.
The Ti m i n g di a gam bel o w shows si g nal ti m i n for the P-l i n e bl o ck
ACLK
An
PCLK
PDATA
PLOAD
PENABLE
Pn
<Figure 11 HEAD Control Part Timing Diagram>
2. A-LINE driving circuit
13 Address Lines are input into 13 Address Counters in
sequence at Rising edge of ACLK signal, which is input
serially into Spitfire. Output of this Counter was connected
to each A-line driver, and this driver output becomes A-line
signal. The sequence of signal input into Address Counter
is decided by ADIR, and if it is ADIR=0, it is input in
sequence of A13A1, and if it is ADIR=1, in sequence of A1
=> A13. AGATE signal is used to reset Address Counter. If
it becomes AGATE=1, A-Line output becomes Low state.
The cycle of ACLK is 1.5ß¡ in minimum, and Sink current of
each Driver is 60mA.
3. P-LINE drive circuit
P-Line values are clocked to 4-bit Serial to Parallel Shift
Register Clock in Spitfire ASIC, and ASIC shall clock-in P-
line NO. of fitting value at Rising Edge of PCLK. These val-
ues are latched to Holding register at Rising Edge of
PLOAD. PLOAD Pulse Duration is 50n, and P-line value of
Holding Register is done AND with PENABLE signal in
order to generate appropriate Fire Pulse. PLCK is available
for handling as much as 4MHz. Drive Current of P-line is
400mA. Data of P1°≠P4 is shifted to PDATAO, that of P5-
P8 shifted to PDATA1, that of P9-P12 shifted to PDATA2,
and that of P13-P16 shifted to PDATA3.
Samsung Electronics
4. Control Signal
• The signal loaded on PDATAO - PDATA2 at Rising edge
of LATCHCTL(Latch Control Nibble) is used as function
as follows in Spitfire.
- PDATA0 == ADIR —> Low : ACLK is operated in Count
- PDATA1 == When Fault Test —> High, check whether
- PDATA2 == When Print Head ID Check —> high,
• The signal loaded into PDATAO-PDATA3 at Rising
edge of LDCS(LoadHtrcs) signal is used in the follow-
ing functions in Spitfire.
- PDATA0 == BLKHTR—> High : Turn on Substrate
- PDATA1 == COLHTR—> High : Turn on Substrate
- PDATA2 == nHSM—> Low : Enable Select Signal of
- PDATA3 == nHSC—> Low : Enable Select Signal of
When Substrate Heater is turned on, Over-current Check
circuit is operated, automatically, and,if the current is above
750mA, the printer stops operation after OK2PRT
becomes low.
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CIRCUIT DESCRIPTION
Down, High : ACLK is operated in Count
Up.
P-Line of Head became short with GND.
make sure that Check mode is set, and,
after that, by using the PDATA0~PDATA2
LIne, make A1-A3 signal for sending, and
Head ID shall come out with PH_IDn out-
put. At this time ID could be displayed only
if each Substrate heater is turned on.
Heater of Mono Head.
Heater of Color Head.
Mono Head.
Color Head.
Repair Manual
3-15