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48

Symptom:  Keyboard produces incorrect characters or character codes

Suggested Tests:

Since  the  elements  which  determine  the  character  codes  are  built  into  the  encoder  and  ROM

integrated circuits at the time of manufacture, it is unlikely that they would cause transmission errors.
Much more probable is that one or more of the diodes in the memory matrix for the HERE IS sequencer

(Figure 8.13) or the three-letter sequencers (Figure 8.14) is reversed or shorted. These diodes will affect
the codes transmitted even when the sequencers are not active, since they are connected in parallel with

the ASCII output lines from the keyencoder.

It is often possible to determine which diode is at fault by comparing the ASCII code for the character

that should be transmitted with that for the character which actually is transmitted. The ASCII codes are

given in Table 4.2.

Symptom:  HERE IS sequencer or three-letter sequencer produce incorrect codes

Suggested Tests:

A common problem which may cause the automatic sequencers to produce incorrect code patterns is

improper  programming  (diode  placement)  of  the  memory  matrix.  Refer  to  Section  V  for  programming
instructions. An open-circuit diode or a missing diode will also cause transmission of an incorrect code for

one character.

Symptom:  Keyboard sends all dots in Morse mode and all blanks in RTTY mode

Suggested Tests:

This  failure  mode  indicates  that  the  data  buses  carrying  ASCII  character  codes  from  the  keyswitch

circuit  board  to  the  logic  circuit  board  are  interrupted.  An  improperly  installed  edge  connector  is  one

possible cause; a defective or incorrectly installed buffer memory option card is another.

Symptom:  One or more keys fails to produce an output

Suggested Tests:

Check  for  a  shorted  or  open  keyswitch.  The  switches  must  be  disconnected  from  the  circuit  before

they can be checked. Rather than removing the entire keyswitch module, it is more satisfactory to break
the  conductor  path  to  the  non-grounded  switch  terminal  with  a  scribe.  Once  the  switch  operation  has

been checked with an ohmmeter, the path may be restored by laying a small piece of bare tinned wire
across the break and soldering it in place.

Test points for the Keyswitch circuit board and Power Supply circuit board are shown in Figures 6.2 and

6.3, respectively. Table 6.1, located on the same fold-out as Figure 6.1, gives the location on the logic circuit

board  of  the  many  different  waveforms  discussed  in  the  text.  Integrated  circuit  designator  numbers  are
printed on the circuit board. Pin 1 of each IC is indicated by a "flag".

Tables 6.2 and 6.3 show the signals or voltages present at the three edge connectors. A complete wiring

list for the wire harness is presented in Table 6.4. Wire colors are assigned only for those wires that connect
to panel mounted components. Wires that only connect between circuit board edge connectors are not
assigned specific colors and are generally the same color in a given harness.

The IC pin numbers for ground and power connections are shown in Table 6.5.

Содержание DKB-2010

Страница 1: ......

Страница 2: ...Please do not return your keyboard or components to the factory until you have sent a letter of notification and have received a written return authorization This warranty is and shall be in lieu of...

Страница 3: ...Circuit Analysis 17 4 4 Scanning Keyboard Encoder 19 4 5 ROM Code Converter 20 4 6 Storage Buffer 20 4 7 RTTY Control and Decoding Circuit 21 4 8 Shift Register and Control Circuit 22 4 9 RTTY Encoder...

Страница 4: ...t at End of Character to Produce Intercharacter Space 31 Figure 4 10 Development of Clock Pulses for Automatic Character Sequencers 33 Figure 5 1a Rear Panel Component Placement Figure 5 1b Matching T...

Страница 5: ...re 8 16 Power Supply Board Component Layout 89 Figure 8 17 Keyboard Circuit Board Component Layout 90 Figure 8 18 Keytop Positions 91 Figure 8 19 Main Logic Board Component Layout IC s 92 Figure 8 20...

Страница 6: ...1 Watt RTTY Keyfunctions 10 numeric 0 through 9 26 alphabetic A through Z 15 punctuation marks 3 carriage control keys linefeed carriage return and blank 2 shift keys 1 break key 2 manual case change...

Страница 7: ...used for either cathode or gridblock keying but not both simultaneously Transistor ratings Cathode keying Voltage nonconducting 250 V DC Current conducting 150 mA DC Grid block keying Voltage noncond...

Страница 8: ...selected by the owner at the time of purchase if not specified it is coded to transmit DX followed by a space For the RTTY operator the DKB 2010 provides automatic transmission of the case shift code...

Страница 9: ...or the kit model In the following sections you will find instructions for installing and operating the DKB 2010 Please read them carefully before attempting to use your keyboard Section 4 provides a f...

Страница 10: ...k their operation If this preliminary test is satisfactory the keyboard is ready to be connected to your CW transmitter and RTTY loop circuit If the keyboard will be used for both RTTY and Morse opera...

Страница 11: ...pin 2 Connect a jumper wire between pins 1 and 3 of the plug Prepare the plug connections as shown in Figure 2 4A Insert the plug into the Morse Output jack on the rear panel of the keyboard A typical...

Страница 12: ...rd ratings UNPLUG THE KEYBOARD AND THE STATION LOOP SUPPLY BEFORE TAKING ANY CONNECTIONS A typical station loop circuit is shown in Figure 2 3 A 6 pin plug is used to connect the loop to the keyboard...

Страница 13: ...larity must be carefully observed when constructing the circuit and the leads must be properly insulated and positioned so that they do not short together This circuit is not recommended for loops ope...

Страница 14: ...the printer is in letters case pressing a letter key followed by a number key should shift it to figures case Typing another letter should return it to letters case After 64 printing characters have...

Страница 15: ...d without using the SHIFT key Some punctuation marks appear on the upper half of their keytops To type these characters press either of the two SHIFT keys and hold it down white you strike the desired...

Страница 16: ...haracters on paper tape respectively Although the keyboard produces all required figures case and letters case codes automatically a figures FIGS key and letters LTRS key are provided so that you may...

Страница 17: ...manner but the RTTY test generator QBF key is inappropriate for Morse transmission and therefore does not function The BLANK key produces the standard eight dot Morse error signal Five double charact...

Страница 18: ...ssage the quick brown fox test signal and the special three character memory sequences The remaining key labeled BREAK allows the operator to break the RTTY loop manually or in the Morse mode to key t...

Страница 19: ...ULL Some of the labels are overscored indicating that the signal carried by the line is inverted or negative true Thus the BUFFER FULL line is at its high level above 2 4 Volt when a character has bee...

Страница 20: ...18...

Страница 21: ...sense logic causes the code appearing at the ROM output at that instant to be transferred to the storage buffer The scanning process is dynamic that is the counters are cycled repetitively at a fairl...

Страница 22: ...causes the flip flop to change states if the preceding character was in letters case The keyboard then transmits a figures shift code before producing the current character Likewise if the current cha...

Страница 23: ...full the line is driven low As soon as the character in the buffer has been accepted by the shift register the BUFFER READ Line is driven low pulling the RESUME ID bus Low also The identifier then pa...

Страница 24: ...r generator gates IC 34 to produce the waveforms shown at the bottom of Figure 8 5 Pin 6 of the gate is low during the 0 and 1 states of the counter producing the C 0v1 output Pin 12 is low during the...

Страница 25: ...of these circuits is activated depending on the setting of the mode switch and the desired Morse or RTTY output is produced The pattern of bits loaded into the shift register depends on the keyboard m...

Страница 26: ...ed to produce many of the characters the ROM code converter is programmed to follow the required bits for each character with an end bit set to the l state with all remaining bits set low For example...

Страница 27: ...r in its base circuit During mark pulses the VH clock signal passes through a NAND gate IC 34 and an inverter IC 24 to drive the emitter of a current source transistor Q1 The pulses are coupled throug...

Страница 28: ...If the letter shift character is to be sent the LTRS CASE bus goes high enabling the lower gate The FIGS CASE line remains low disabling the upper gate so its output remains high The C 0v1 signal then...

Страница 29: ...the baud rate The H clock line synchronizes operation of the keyboard encoder Figure 8 3 with the buffer control and the shift register control circuits Figures 8 4 and 8 6 respectively The H clock si...

Страница 30: ...f IC 25 drive the gate output low resetting all stages of the counter After 32 input pulses the counter output goes high after the 64th pulse it goes low again The counter output is fed to the clock i...

Страница 31: ...e flip flop is driven by decoder output 4 pin 5 During the next three clock pulses the flip flop does not change states because its J and K inputs are held low After clock pulse 3 however the decoder...

Страница 32: ...op is coupled through the gate to the Morse character bus For dashes both flip flops are active and the two output lines are logically added in the gate as shown in trace g of Figure 4 8 At the end of...

Страница 33: ...he incoming character pulses The output of the third gate drives the emitter of Q6 a constant current source which in turn drives the transmitter keying transistor Q5 When the gate output is high the...

Страница 34: ...START line low If the mode switch is set for RTTY operation the M R line is low also Both signals are coupled to the input of a NOR gate pins 2 and 3 of IC 54 With the key pressed both inputs are low...

Страница 35: ...e states the counter stages will assume when the power is first switched on the circuit may start in the active state To clear the counter quickly in the Morse mode the VH clock signal is supplied to...

Страница 36: ...a space The other is programmed at the user s option for any desired message The circuit shown in Figure 8 14 is essentially a simpler version of the identifier Each sequencer contains a two bit coun...

Страница 37: ...II input code The ROM produces different outputs for Morse and RTTY modes depending on the state of the A7 input bit Both output codes are listed for each character Since some of the characters are no...

Страница 38: ...1010 101 0101 101 0110 101 0111 101 1000 101 1001 101 1010 011 0000 011 0000 1 011 0001 010 0001 2 011 0010 010 0010 3 011 0011 010 0011 4 011 0100 010 0100 5 011 0101 010 0101 6 011 0110 010 0110 KE...

Страница 39: ...37 Table 4 3 ROM Converter Input and Output Codes...

Страница 40: ...0 0 1 1 1 0 1 0 1 1 0 1 1 1 1 1 0 0 1 1 1 0 1 1 1 1 1 0 1 1 1 1 1 BLANK E LF A SPACE S I U CR D R J N F C K T Z L W H Y P Q O B G FIGS M X V LTRS BLANK 3 LF SPACE BELL 8 7 CR 4 5 2 6 1 9 FIGS LTRS No...

Страница 41: ...39 Table 4 5 Morse Codes Character Code Character Code A B 1 C 2 D 3 E 4 F 5 G 6 H 7 I 8 J 9 K L M N O P Q R S T __ U AS __ V SK __ W BT __ X AR __ Y KN Z ERROR...

Страница 42: ...automatic sequence keys are precoded by inserting diodes at the proper location in the diode matrix on the logic circuit board The diodes are positioned to represent the ASCII code for each character...

Страница 43: ...41 Table 5 1 Coding Chart for Identifier Character A0 A1 A2 A3 A4 A5 A6 CQ key AUX key HERE IS key...

Страница 44: ...42 Table 5 1 Coding Chart for Identifier Character A0 A1 A2 A3 A4 A5 A6 CQ key AUX key HERE IS key...

Страница 45: ...positioned as indicated by Figure 5 14 178 The figure shows how the diodes should be positioned for the CQ key Note that the diodes are inserted into the board from the component side Referring to the...

Страница 46: ...r panel Check again that the wiring harness is not pinched between the cover and the cabinet then fasten the cover in place with four 6 32 5 6 screws one at the front lip and three at the rear Assembl...

Страница 47: ...ng all pins of a component such as a 14 pin DIP integrated circuit simultaneously Solder wicking essentially very fine copper braid can be used to absorb solder from the pins once the solder has been...

Страница 48: ...ections are being changed Note that unplugging the power supply board will disable the supply Measure the 12 Volt supply at the point shown in Figure 6 1 It should read between 10 5 and 13 5 Volt If t...

Страница 49: ...the RTTY mode only Use the waveforms in Section IV for comparison to those observed in the unit under test Symptom Keyboard fails to operate at one RTTY speed O K at other speeds and in the Morse Mode...

Страница 50: ...carrying ASCII character codes from the keyswitch circuit board to the logic circuit board are interrupted An improperly installed edge connector is one possible cause a defective or incorrectly insta...

Страница 51: ...Y Load I16 3 Morse End I17 2 4 Morse Character I18 6 RTTY Load I19 8 DASH I22 8 Insert Case Code I22 5 ____ DOT I23 8 DOT I23 9 Waveform IC Pin 100 WPM Osc I24 4 Letters Case I25 3 4 Figures Case I25...

Страница 52: ...50 Figure 6 1 Logic Circuit Board Test Points...

Страница 53: ...51 Figure 6 2 Keyswitch Circuit Board Test Points...

Страница 54: ...52 Figure 6 3 Power Supply Circuit Board Test Points...

Страница 55: ..._ N ID Active to J of buffer P not used R not used S not used T not used U Speed pot V W Weight H X Weight N Y Weight L Z Weight VL ________ 1 QBF Start ___________ 2 HERE IS Start ________ 3 AUX Star...

Страница 56: ...D A3 E A8 not used F A1 H A0 J A7 not used K A6 L A5 M A4 _____ N SHIFT to buffer P Ground S not used ____ T Clock U Ready _____ V Enable W 5 Volt X 12 Volt _______ Y CQ Start ________ Z AUX Start Pow...

Страница 57: ...55 Table 6 4 DKB 2010 Wire List...

Страница 58: ...Ground and Power Connections IC Type Ground 5 Volt 12 Volt MM5213 none 12 16 24 or MM5231 MM5740 2 32 18 7400 7 14 7401 7 14 7402 7 14 7404 7 14 7405 7 14 7410 7 14 7420 7 14 7430 7 14 7442 8 16 7474...

Страница 59: ...Resistors 2 100 Watt 2 120 Watt 1 180 Watt 1 220 Watt 3 270 Watt 1 330 Watt 3 390 Watt 1 470 Watt 4 560 Watt 26 1 k Watt 4 1 8 k Watt 1 2 2 k Watt 1 2 7 k Watt 1 3 3 k Watt 1 4 7 k Watt 1 8 2 k Watt...

Страница 60: ...22 tinned bar wire 1 36 length no 22 hook up wire 1 9 length no 22 insulated sleeving 1 48 length no 30 Strip eze magnet wire 1 40 length no 22 Multi core solder 2 48 length 2 conductor shielded cabl...

Страница 61: ...dapter 1 Space bar torsion bar 1 Keytop Set consisting of 1 Space bar Keytop 1 Blank Keytop 2 Shift Keytops 1 AUX Keytop 1 CQ Keytop 1 HERE IS Keytop 1 KN RETURN Keytop 1 BRK Keytop 1 QBF Keytop 1 BT...

Страница 62: ...re 8 5 RTTY Control and Decoder Figure 8 6 Shift Register Control Figure 8 7 RTTY Encoder and Loop Interface Figure 8 8 RTTY Timing Chain Figure 8 9 RTTY Character Counter Figure 8 10 Morse Character...

Страница 63: ...61...

Страница 64: ...62...

Страница 65: ...63...

Страница 66: ...1 F Disc Ceramic Capacitor 16 Volt R101 R107 1 k Watt Resistor Q101 MPS3702 MPS3703 or MPS6518 PNP Transistor D101 D138 1N4148 Silicon Diode I101 MM5740AAA N Integrated Circuit I102 7410 Integrated C...

Страница 67: ...65...

Страница 68: ...66 Parts List Figure 8 4 Buffer Control R1 R8 6 8 k Watt Resistor I1 I2 7474 Integrated Circuit I3 7402 Integrated Circuit I4 I5 7475 Integrated Circuit I6 MM5213 N MM5231 N or MM5203 N...

Страница 69: ...67...

Страница 70: ...Watt Resistor R11 2 7 k Watt Resistor R12 R13 10 k Watt Resistor R14 8 2 k Watt Resistor R14A 270 Watt Resistor D1 D2 1N270 Germanium Diode I14 I33 I34 7410 Integrated Circuit I16 I25 7400 Integrated...

Страница 71: ...69...

Страница 72: ...6 Shift Register Control R9 1 k Watt Resistor I7 7474 Integrated Circuit I8 I11 7402 Integrated Circuit I9 I10 7496 Integrated Circuit I12 7404 Integrated Circuit I16 I18 7400 Integrated Circuit I17 7...

Страница 73: ...71...

Страница 74: ...t Resistor D4 D5 D6 1N4148 Silicon Signal Diode D7 1N4005 Silicon Power Diode Q1 MPS3702 MPS3703 or MPS6518 PNP Transistor Q2 2N5655 or MJE340 NPN Transistor I24 7404 Integrated Circuit I25 I55 7400 I...

Страница 75: ...73...

Страница 76: ...tt Resistor R29 R32 560 Watt Resistor D8 1N270 Germanium Diode I24 I29 7404 Integrated Circuit I30 7405 Integrated Circuit I35 7402 Integrated Circuit I36 I39 7493 Integrated Circuit S301 5 position 2...

Страница 77: ...75...

Страница 78: ...apacitor R37 1 k Watt Resistor R38 10 k Watt Resistor I13 74121 Integrated Circuit I19 7404 Integrated Circuit I20 I23 7473 Integrated Circuit I21 7493 Integrated Circuit I25 7400 Integrated Circuit I...

Страница 79: ...77...

Страница 80: ...everse Log Taper Potentiometer I11 7402 Integrated Circuit I12 I19 I32 7404 Integrated Circuit I14 7410 Integrated Circuit I15 I22 7474 Integrated Circuit I18 7400 Integrated Circuit I23 7473 Integrat...

Страница 81: ...79...

Страница 82: ...270 Watt Resistor R43 1 k Watt Resistor R43A 4 7 k Watt Resistor P1 500 Trim Pot Vertical Mounting P302 500 Linear Potentiometer with Switch Volume Control D9 1N4148 Silicon Signal Diode D10 1N4005 S...

Страница 83: ...81...

Страница 84: ...itor C19A 0 001 F Disc Ceramic Capacitor R44 R50 10 k Watt Resistor R51 1 k Watt Resistor D11 D17 1N270 Germanium Diode I41 7404 Integrated Circuit I44 7420 Integrated Circuit I47 7401 Integrated Circ...

Страница 85: ...83...

Страница 86: ...Figure 8 13 Identifier C20A 0 001 F Disc Ceramic Capacitor I40 I42 7442 Integrated Circuit I41 7404 Integrated Circuit I43 7493 Integrated Circuit I54 7402 Integrated Circuit JPR5 Jumper 28 Insulated...

Страница 87: ...85...

Страница 88: ...racter Sequencer C21A C22A 0 001 F Disc Ceramic Capacitor I41 7404 Integrated Circuit I44 7420 Integrated Circuit I45 147 7401 Integrated Circuit I46 I48 7473 Integrated Circuit I53 7400 Integrated Ci...

Страница 89: ...87...

Страница 90: ...205 220 Watt Resistor R206 270 Watt Resistor R301 100 k Watt Resistor P201 500 Trim Pot Vertical Mounting D201 D202 1N4148 Silicon Signal Diode D203 1N4742 Zener Diode 12 Volt 1 Watt D204 D207 1N4001...

Страница 91: ...89...

Страница 92: ...90...

Страница 93: ...91...

Страница 94: ...92...

Страница 95: ...93...

Страница 96: ...A1 EXTENDED MEMORY OPTION FOR THE DKB 2010 KEYBOARD INSTRUCTION MANUAL...

Страница 97: ...rd on its right end Remove the three screws from the lip of the bottom cover at the rear of the unit Remove the screw from the center of the front edge of the bottom plate Slide the bottom plate back...

Страница 98: ...filled the BUFFER FULL lamp will light In that case stop typing until the keyboard has had a chance to transmit some of the stored characters As soon as memory space is available for another keystrok...

Страница 99: ...ne of a series of logic gates which actuates the appropriate character sequencer in the keyboard Characters or keystrokes from the keyswitch board enter the buffer whenever the READY line from the key...

Страница 100: ...A5...

Страница 101: ...A6...

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