Texas Instruments OMNi810 Maintenance Manual

signal is applied through the driver circuits to turn on Q4. Q4 will remain on as long as the processor is commanding forward motion. CMFWD will prevent Q3, Q2 from conducting. (Refer to Figure 4-24.) The operation of the carriage motor circuit can be analyzed using the conduction paths illustrated in Figure 4-25 for forward motion. Conduction in transistor Ql is controlled by three signals: CMFWD, SCON, and ILOW. CMFWD and SCON are generated by the processor board and are assumed to be true for this ...

NOTE: Underl ined characters represent ASC II code. ASCII Code Command Characters Printer Action Taken Received Carriage CR This command causes data, if any, in the line buffer to be printed. Return Because of the bidirectional printing capability of the printer, a carriage retu rn is not executed. I nstead, the carriage stops upon completion of printing a tine. When the next line is received, the carriage is positioned to print forward or backward, whichever re- quires the least carriage movement. Delete DEL This command clears the line buffer. If the NDE (no dele ...

... POWER GOOD/RESET PWRGOOD +12 V MONITOR ... CIRCUIT RST +5 ENA POWER UP POWER DOWN POWER GOOD ~ r RESET I I I I I I tl ~t2-.j --i t3 r- A0001531 Figure 4-41. Powergood/Reset Signal Profdes ,-------- I I +12 MONITOR +5 ENABLE I I OELAY & +11.4 +5 ENA ENERGY I STORAGE (C18) R53 +12 MONITOR I I Vref I REFERENCE I I CR28 I REGULATOR I . R89 J I ....-- +5V RST & POWERGOOD MONITOR COMPARATOR f----< ; POWER GOOD CIRCUIT +5 PWRGOOD CIRCUIT REFERENCE r---- ~ I I ~ R5S > J I R79 CR30 I - +12V 1 RESET I COMPARATOR ~ C231 CIRCUIT CIRCUIT ~ I J I RST I ~ CR3 1\0001541 Figure 4-42. Poweigood ...

Source Function No. Name Designation 1 Protective Ground AA(101) None Chassis ground 2 Transmitted Data BA(103) Printer This signal is at the negative E lA level ~n the normal mode, and at the positive EtA level in the test mode. 3 Received Data BB(104) Input Device Received serial data. 4 Request to Send CA(105) Printer This signal is held at the negative EIA level. 5 Clear to Send CB(106) I nput Device (Not used) 6 Data Set Ready CC(107) Input Device This signal must be at the positive EIA level for the printer to receive data. 7 Signal Ground AB(102) ...

NORMAL 3.3.1 -+--------~~ TESTIVFC 3.3.2 _+--O-:N"J 1 2 3 4 5 6 71 BASIC (994292-0001) BSC (OPT) 3.3.S 3.3.4 3.3.3 3.3.2 0 FORM LENGTH 6 7 . 8 NORMAL ,------+--3.3.1 "~.' cQ) 4 11 TESTIVFC 3.5 12 3 14 PROG 0:: 11 2 34 5 6 71 (OJ'~----7----+- 3.3.7 0 FORMS LENGTH AND COMPRESSED PRINT (994293-0001) FCO (OPT) 3.3.S ~ (OPT) 3.3.S -----r~ES±i~~±2J~~l 0 FORM LENGTH 0 6 7 8 NORMAL "~.' ~ 3.3.4 4 11 TESTIVFC 3.5 12 3 14 -------+- 3.3.1 PROG -------+-- 3.3.3 ON 3.3.2 OFF '0 FORMS LENGTH (994292-0002) He (OPT) 3.3.S -----II§§~~~§)l ,;-----+-- 3.3.1 .:"v.v~ 3.3.5--;-~( ...