OPERATION AND MAINTENANCE SILTRONIX MODEL FD-1011 DIGITAL DIAL A Division of Cubic Corporation October 1976 Reprinted 2006
TABLE OF CONTENTS SECTION I DESCRIPTION 1-1 General 1-4 Specifications 3 3 SECTION II INSTALLATION 2-1 Fixed Installation 4 2-3 Mobile Installation 4 2-6 VFO Connection 4 SECTION III OPERATION 3-1 On/Off Switch 3-3 Display SECTION V MAINTENANCE 5-1 General 5-3 Calibration 5-5 Disassembly 5-6 Cover Removal 5-8 Circuit Board Removal 5-10 Display Removal 5-12 Troubleshooting 10 10 10 10 10 10 10 SECTION VI PARTS LISTS 6-1 General 17-18 5 5 SECTION IV THEORY OF OPERATION 4-1 General 6 4-3 Functional De
SECTION I DESCRIPTION 1-1 GENERAL 1-2 The Siltronix Model FD-1011 Digital Dial is a companion unit to the Siltronix Model 1011D 10 Meter Amateur Radio Transceiver and Citizens Band (CB) Receiver. Plugging two connectors from the FD-1011 into mating connectors on the rear panel of the Model 1011D completes the installation. The FD-1011 then indicates the frequency to which the Model 1011D is tuned, with crystal controlled time base accuracy, on a five digit LED display.
SECTION II INSTALLATION 2-1 FIXED INSTALLATION 2-2 To install the FD-1011 as a companion unit to a Model 1011D Transceiver operating from 117VAC, insert the AC connector from the FD-1011 into the AC receptacle on the rear of the 1011D marked ―FD-1011 ACC‖ (117VAC SW). This receptacle is energized whenever the Model 1011D is turned on, therefore, the FD-1011 power switch may be left on with power being controlled by the Model 1011D.
SECTION III OPERATION 3-1 ON/OFF SWITCH 3-2 When the FD-1011 and 1011D are operated from a 117VAC source, power will be applied to the FD-1011 only when the front panel ON-OFF switch, which is combined with the VOLUME control on the 1011D, is turned ON. The front panel ONOFF switch on the FD-1011 may then he left in the ON position at all times. When operated from 13.8VDC, the front panel ON-OFF switch must be actuated to turn the unit on and off.
SECTION IV THEORY OF OPERATION 4-1 GENERAL 4-2 This section of the manual describes, in detail, the operation of the amplifiers and logic circuits of the Siltronix FD-1011 Digital Dial. The descriptions are in two parts. The first, supported by the block diagram of Figure 4-1, describes the circuit functionally as a prelude to the more detailed descriptions of the second part which is supported by the logic/schematic diagram of Figure 5-2 and a timing diagram, Figure 4-2.
4-12 Timing Signal Generation 4-13 The identifications of the timing signals of Figure 4-2 are derived from the IC and terminals of their origins. For example, the 500 Hz clock originates from A12, terminal 11. It is identified as A12-11. Timing signal A, which is the reset pulse, is generated by firs combining the 500 Hz clock with A11-11 in NAND gate A6-A. Referring to Figure 4-2 it is seen that the inputs to A6-A are both high only during the time of each 5th successive clock pulse.
4-18 Reset 4-19 At the end of the 9 millisecond display period, the display is blanked. Counters A9, A10 and A15 are reset by timing signal A inverted and counters A7 and A8 are both preset to 5 by A completing the sample, display, reset sequence which is then repeated. 4-20 Power Supply 4-21 The power supply operates from either 117VAC or 13.8VDC.
Figure 4-1 Block Diagram, Model FD-1011 Figure 4-2 Timing System Waveforms Page 9 Copyright 2006 Robert A.
SECTION V MAINTENANCE 5-1 GENERAL 5-2 The Siltronix FD-1011 Digital Dial requires no periodic or preventative maintenance. Maintenance procedures, therefore, cover calibration, disassembly and troubleshooting. 5-3 CALIBRATION 5-4 Connect a counter to the 1011D VFO output or to a signal generator and set the frequency to 23.500 MHz ± 0.0001 MHz. Next, connect the source of that frequency to the input of the FD-1011.
CHART I TROUBLESHOOTING GUIDE Symptom Probable Cause / Cure Unit is totally inoperative. Check fuses. Unit operates on 117VAC but not on 13.8VDC. Check fuse and diodes CR1 through CR4. Operates on DC. Will not operate on AC. Check for defective fuse, F2, defective transformer Ti and bridge rectifier diodes CR5 through CR8. All digits in display light but unit is inoperative. See Chart II for troubleshooting procedure for this symptom. Unit operative but with small error. Requires calibration.
CHART II Unit Inoperative - Display Lighted with 25.500 Check for waveform B at A1-C-6. See Figure 4-2 BAD Go to Chart III BAD Defective C9 or coax cable. Analyze and repair. BAD Look for open L1, shorted C10, or defective Q1. OK Check for input at base of Q1. OK Check for input at collector of Q1. OK Check for 10 ms. Bursts of input signal at A6-B-6. BAD Replace A6. BAD Replace A15. OK Check for 10 ms. Bursts of input signal divided by 10 at A15-12.
CHART III Timing System Inoperative Check for 2.048 MHz oscillator output at A1-D-8. BAD Troubleshoot and repair oscillator. BAD Replace A14. OK Check for 128 KHz output at A14-11. OK Check for 8 KHz output at A13-11. BAD Replace A13. OK Check for 500 Hz output at A12-11. BAD Replace A12. BAD Replace A11. BAD Replace A6. BAD Replace A1. OK Check for 50 Hz waveform C at A11-12. OK Check for proper waveform C at A6-A-3. Inverse of A1-A-2, Figure 4-2.
CHART III (Continued) From Proceeding Page. Check A1-B-4 for inverted waveform C. BAD Replace A1. BAD Replace A6. OK Check waveform A at A6-D-11. OK Check for inverted waveform B at A6-C-8. BAD Replace A6. OK Check for waveform B at A1-C-6. BAD OK Timing system operating normally. Page 14 Copyright 2006 Robert A. Larson, KC9ICH Replace A6.
Figure 5-1 Component Locations R30-34 R2-29 Z1 A4 A9 Z2 Z3 A3 A8 Z4 A7 A2 Z5 C1-7 C13 R38 C12 C19 R39 A1 A6 C11 C8 A5 C7-4 A10 C7-3 R37 A15 A11 A14 C9 C5 C6 T1 R36 Q1 R35 C4 CR2 C7-2 C1-C2 C3 F2 A13 CR5-8 C7-5 F1 A12 L1 C10 Page 15 Copyright 2006 Robert A.
Figure 5-2 Schematic Diagram Page 16 Copyright 2006 Robert A.
SECTION VI PARTS LISTS 6-1 GENERAL 6-2 The replaceable electrical parts of the FD-1011 listed in Table 6-1. When ordering items not listed in Table 6-1, please furnish a complete description of the item. Table 6-1 Replaceable Parts List CAPACITORS C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C19 0.002 mfd., 500V, Disc 0.002 mfd., 500V, Disc 0.05 mfd., 500V, Disc 3300 mfd., 16V 0.1 mid., 50V 0.1 mfd., 12V, Disc 0.01 mfd., 100V, Disc 0.05 mfd., 500V, Disc 68 pfd., Disc 10 pfd., NPO, Disc 20 pfd.
Table 6-1 Replaceable Parts List (Continued) RESISTORS R2 — R29 R30 — R34 R35 R36 R37 — R39 220 Ohms, 1/4 Watt, 5% 470 Ohms, 1/4 Watt, 5% 27K Ohms, 1/4 Watt, 5% 47 Ohms, 1/4 Watt, 5% 1.5K Ohms, 1/4 Watt, 5% 045-221 045-471 045-273 045-470 045-152 Fuse, 2A Fuse, 0.5A, 250V Inductor, 2.7 uh Transistor, 2N5130 Switch, DPDT, Slide Crystal, Quartz, 2.
LIMITED WARRANTY POLICY SILTRONIX warrants this equipment against defects in material or workmanship, except for tubes and solid-state devices, under normal service for a period of six (6) months from original purchase date. Tubes and solidstate devices are warranted for a period of ninety (90) days. This warranty is valid only if the enclosed warranty registration card is properly completed and mailed to the factory within ten (10) days of purchase date.
