Heathkit mMATIC SA-5010A Manual
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Heathkit mMATIC SA-5010A Manual

Memory keyer
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Heathkit
µMATIC ™
MEMORY KEYER
Model SA-5010A

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Summary of Contents for Heathkit mMATIC SA-5010A

  • Page 1 Heathkit µMATIC ™ MEMORY KEYER Model SA-5010A...
  • Page 2 INTRODUCTION The SA-5010A µMatic Memory Keyer is a compact unit with modern design in electronics and styling. The Memory Keyer uses a microprocessor which keeps component count low and reliability high. Features of the Memory Keyer include: 1. Up to 10 buffers for storing text or commands. These are variable length buffers, which elimi- nates wasted memory space.

  • Page 3: Assembly Notes

    ASSEMBLY NOTES Diese Abschrift des originalen Manuals von 1985 wurde im April 2018 gefertigt. Es wird daher davon ausgegangen, dass jetzt ein fertig aufgebautes Gerät vorliegt. Auf die Wiedergabe der Auf- bauhinweise wird daher verzichtet. This copy of the original manual printed 1985 was made in April 2018. It is therefore assumed that there is now a ready-built device.
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  • Page 5: Operation

    OPERATION TRANSMITTER TUNE-UP When you press the TUNE key with the keyer in the NORM·al mode, or when you are paused in the SEND or PRAC tice mode, the transmitter will be keyed continuously. (Note that, if the keyer is in PAUSE but the current character has not "completed", the TUNE key is not active until it completes).
  • Page 6 CODE PRACTICE Automatic code practice is available by pressing keys and PRAC . is a single-digit or dou- ble-digit number and establishes a "seed" for a random character generator. The single digit (or second digit of a double digit entry) also selects the character types to be generated for practice as follows: n = 1 –...
  • Page 7 The delay between words may be as long as you desire; only one wordspace will occur at that point. You may store one or more automatic pauses into a buffer by pressing the P/C key at the points you desire. When you send a message, it automatically pauses and allows you to in- sert text using the paddles.
  • Page 8 NOTE: When you listen to the keyer sidetone, the first character sent after pressing SEND may appear to begin with an extra dot. This is only the keypad "click", which does not key the output jacks. LOADING A COMMAND BUFFER You can use any of the ten buffers to designate a sequence of messages to be sent and, in addi- tion, alter the speed, spacing, weight and repeat count.

  • Page 9: Self-Diagnostics

    NOTES: 1. Any parameters that you change within a command string will return to the values you last set from the keypad when the keyer returns to the NORM al mode. 2. You should avoid using extra digit keys in a command buffer since they waste buffer space. SELF DIAGNOSTICS Each time you turn the keyer on, a checksum is performed on the contents of the program in ROM.
  • Page 10 will be sent due to the action of the dot closure memory). Thus, the character is sent with a simple "squeezing" of the paddles. This is often referred to as a "squeeze keyer". Several keyer timing ex- amples are shown in Pictorial 6-4. PICTORIAL 6-4 - 10 -...

  • Page 11: Summary Of Commands

    STATUS LEDs PRAC LOAD PAUSE SEND NORM Normal (power-up) mode (dim) Normal mode, digit(s) pressed* In "load text" or "load command" mode Sending a message buffer Paused while sending a message buffer Paused from a command string Sending code practice Paused while sending code practice * A pressed digit key(s) is "remembered"...
  • Page 12 PICTORIAL 6-5 TRANSMITTER AND EXTERNAL KEY CONNECTIONS Two jacks are provided on the rear panel of the keyer; one keys the positive (+) keylines to ground and the other keys the negative (–) keylines to ground. If you are not sure which jack to use for a particular transmitter, you may examine the transmitter schematic, or you may simply try one jack or the other.

  • Page 13: External Battery Connection

    EXTERNAL BATTERY CONNECTION If you would like to connect your keyer to an external battery, a plug is supplied for this purpose. Wire the plug as shown in Pictorial 6-6. You can wire the plug without concern for polarity, due to the diode bridge in the keyer.
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  • Page 24: In Case Of Difficulty

    IN CASE OF DIFFICULTY This part of the Manual will help you locate and correct any difficulty which might occur in your µMatic Memory Keyer. This information is divided into three sections. The first section, "General", contains suggestions in the following areas: Visual checks and inspection.

  • Page 25: Troubleshooting Chart

    TROUBLESHOOTING CHART This Troubleshooting Chart lists specific difficulties that could occur in your µMatic Memory Keyer. Several possible causes may be listed for each difficulty. Refer to the X-RAY View (page 30) of the circuit board and the Schematic Diagram to locate and identify the part listed in this chart. If the particular part is mentioned (U1 for example) as a possible cause, check that part and other components connected to that part to see that they are installed and/or wired correctly.

  • Page 26: Specifications

    SPECIFICATIONS Speed Range ..... 1 to 99 WPM. Spacing ......Less than or equal to Speed. Number of Buffers ..... 1 to 10. May be used to store text or commands strings. Buffer Size ......240 characters and/or commands. Weighting ......Normal plus five "light" and five "heavy" settings. Auto Message Repeat ..

  • Page 27: Circuit Description

    CIRCUIT DESCRIPTION CONTROLLER The SA-2010A Memory Keyer is controlled mainly by U1 which is a custom 3870 single-chip micro- processor. This microprocessor services the keypad and paddles, determines basic keyer timing, keys the sidetone and output circuitry, stores and retrieves data from the external RAM and up- dates the status LEDs.

  • Page 28: Output Circuitry

    as a closed switch in the matrix. When you use external paddles, transistors Q4 or Q5 are turned off by a paddle closure, also resetting the associated flip-flop, producing the same results. The oscillator also drives a "charge-pump". This circuit consists of capacitor C2 and C3 and diodes D2 and D3.

  • Page 29: Status Leds

    ies are only switched in when the keyer is disconnected from its source of power; thus, you can extend the battery life by leaving the keyer plugged into an AC outlet when it is not in use. STATUS LEDs Whenever the status of the keyer is changed, the data in an internal status register is atache into IC U7 and causes the appropriate LED(s) to light.

  • Page 30: Circuit Board X-Ray Views

    CIRCUIT BOARD X-RAY VIEWS - 30 -...

  • Page 31: Integrated Circuits

    DIODES MAY BE REPLACED CIRCUIT COMP. NO. IDENTIFICATION WITH 1N4149 D1, D5, D6, D7, D13 GD510 D2, D3, D4 DRS110, 1N5399 D201, D202 1N4002 D8, D9, D11, D12 TIL209 D101...D105 TRANSISTORS MAY BE REPLACED CIRCUIT COMP. NO. IDENTIFICATION WITH 2N4121 Q6, Q15 MPSA42 MPSA20...
  • Page 32 MAY BE REPLACED CIRCUIT COMP. NO. IDENTIFICATION WITH CD4011 14013 14049 14071 74LS174 - 32 -...
  • Page 33 MAY BE REPLACED CIRCUIT COMP. NO. IDENTIFICATION WITH 5101 or 51L01 U2, U3 3870 SCHEMATIC OF THE HEATHKIT ® SA-5010 µMATIC KEYER - 33 -...
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  • Page 36 NOTES: 1. Parts are numbered in the following groups: 1 – 49 Parts on the main circuit board. 100 – 109 Parts on the LED circuit board. 200 – 209 Parts on the case. 2. All resistors are ¼ Watt, 5 % unless marked otherwise. 3.

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