User manual RADIOSHACK 5 PART PDF FILE

20-526 PRO-96 Digital Trunking Handheld Scanner Catalog Number: 20-526 CONTENTS Page Specifications .................................................................................................................................................... 2 Block Diagram ................................................................................................................................................... 4 Alignment and Adjustment ................................................................................................................................ 5 Troubleshooting ................................................................................................................................................. 9 Printed Circuit Board ....................................................................................................................................... 16 Wiring Diagram ................................................................................................................................................ 20 Exploded View ................................................................................................................................................. 21 Mechanical Parts List ....................................................................................................................................... 22 Electrical Parts List ........................................................................................................................................... 23 Semiconductor Lead Identification .................................................................................................................. 57 Microprocessor (IC204) Port Format ............................................................................................................... 63 Schematic Diagram ......................................................................................................................................... 64 © 2003 RadioShack Corporation All Rights Reserved. SPECIFICATIONS Frequency Coverage 25.000-27.995 MHz 28.000-54.000 MHz 108.000-136.9875 MHz 137.000-150.775 MHz 150.7825-150.8125 MHz 150.815-154.4525 MHz 154.45625-154.47875 MHz 154.4825-154.505 MHz 154.510-154.525 MHz 154.5275-154.54625 MHz 154.5475-154.6075 MHz 154.610-154.655 MHz 154.6575-156.2475 MHz 156.250-157.475 MHz 157.4775-161.565 MHz 161.570-173.200 MHz 173.20375-173.2225 MHz 173.225-173.3875 MHz 173.390-173.415 MHz 173.420-174.000 MHz 216.0025-221.9975 MHz 222.000-225.000 MHz 406.000-512.000 MHz 806.000-823.9875 MHz 849.000-868.9875 MHz 894.000-960.000 MHz 1240.000-1300.000 MHz 5 kHz steps (AM) 5 kHz steps (FM) 12.5 kHz steps (AM) 5 kHz steps (FM) 7.5 kHz steps (FM) 7.5 kHz steps (FM) 7.5 kHz steps (FM) 7.5 kHz steps (FM) 5 kHz steps (FM) 6.25 kHz steps (FM) 7.5 kHz steps (FM) 5 kHz steps (FM) 7.5 kHz steps (FM) 5 kHz steps (FM) 7.5 kHz steps (FM) 5 kHz steps (FM) 6.25 kHz steps (FM) 6.25 kHz steps (FM) 6.25 kHz steps (FM) 5 kHz steps (FM) 5 kHz steps (FM) 5 kHz steps (FM) 6.25 kHz steps (FM) 6.25 kHz steps (FM) 6.25 kHz steps (FM) 6.25 kHz steps (FM) 6.25 kHz steps (FM) Unit Sensitivity FM: (S+N)/N=20 dB Dev.: 3 kHz at 1 kHz 25-54 MHz 108-136.9875 MHz 137-225 MHz 406-512 MHz 806-960 MHz 1240-1300 MHz AM: (S+N)/N=20 dB Mod.: 60% at 1 kHz 25-54 MHz 108-136.9875 MHz 137-225 MHz 406-512 MHz 806-960 MHz 1240-1300 MHz µV µV µV µV µV µV µV µV µV µV µV µV 0.1 0.3 0.5 0.5 0.7 0.7 1 1 1.5 2 2 3 1 1 2 2 3 4 3 3 5 6 6 12 Niminal Limit 2 Unit Data decode sensitivity CT DC ED MO (Voice Channel) MO (Control Channel) WX Alert 1050 Hz tone WX Digital Weather Alert Squelch sensitivity at threshold at tight (FM) at tight (AM) Spurious refection (Except Primary image) at 174 MHz Acceptable radio frequency displacement (EIA RS-204D) Signal to noise ratio (FM and AM) RF input: 100 µV Dev. 3 kHz at 1 kHz Mod.: 60% at 1 kHz 25-54 MHz 108-136.9875 MHz 137-225 MHz 406-512 MHz 806-960 MHz 1240-1300 MHz Residual noise Scanning rate Search rate Scan delay time Audio output power 10% THD Squelched Current drain (using AC or DC adapter) Channels of operation Channels, frequency, and mode display Receiving system Direct key entry digital-controlled synthesizer, 1st IF: 380.72750-380.86875 MHz 2nd IF: 21.4 MHz 3rd IF: 455 kHz Power source Jacks Dimensions (HWD) Weight 6V DC negative ground only 4AA batteries or a suitable adapter Antenna, earphone, PC/IF, and external power 6 3/16 x 2 7/16 x 1 3/4 inches (157 x 62 x 41 mm) apporox. 8.8 oz. (250 g) without antenna and batteries without trunking at 162.25-164.25 MHz dB dB dB dB dB dB channels/sec. steps/sec. sec. mW mA (AM/FM) µV dB dB dB kHz 350 Hz Dev. at 41, 174, 450, 860 MHz 350 Hz Dev. at 41, 174, 450, 860 MHz 4 kHz Dev. at 174, 450, 860 MHz 350 Hz Dev. at 174, 450, 860 MHz 4 kHz Dev. at 174, 450, 860 MHz 3 kHz Dev. at 162.4 MHz 4 kHz Dev. at 162.4 MHz µV µV µV µV µV µV µV Niminal Limit 1 1 1 0.5 1 0.3 0.5 3 3 4 3 4 1 2 0.5 25 20 40 ±6 40 40 40 35 35 35 1 60 75 2 170 130 2 15 10 30 ±3 30 30 30 25 25 25 3 33-66 60-85 1-3 140 150 Volume control, set to its minimum, squelched mV Any 500 channels in any band combination and 11 in V-Scanner Liquid crystal display Note: Nominal specs represent the design specs. All units should be able to approximate these specifications. Some units will exceed while some many drop below these specs. Limit specs represent the absolute worst condition still considered acceptable. A unit should NEVER fail to meet limit specs. 3 BLOCK DIAGRAM 4 ALIGNMENT AND ADJUSTMENT ALIGNMENT AND TEST POINTS TP2 L2 T1 T2 L27 L22 GND TP3 VR2 VR3 TP4 TP5 L23 VR4 TP1 ALIGNMENT PREPARATION Test Equipment Required l Oscilloscope l DC SSVM l AM/FM signal generator (25 to 1300 MHz) l Frequency counter (800 MHz) Notes: l Use non-metallic tuning tools l The test equipment and receiver should be warmed up for at least 10 minutes before proceeding with alignment. l The signal level from the generator should be kept as low as possible to obtain a usable output. l The memory backup circuit can hold the programmed channel memories for about one hour. Program Channels 000 through 011 as follows: Channel 000 001 002 003 004 005 Frequency and Band Mode 960.000 MHz (FM) 25.000 MHz (FM) 1300.000 MHz (FM) 216.0025 MHz (FM) 512.000 MHz (FM) 174.000 MHz (FM) Channel 006 007 008 009 010 011 Frequency and Band Mode 173.390 MHz (FM) 173.420 MHz (FM) 154.5475 MHz (FM) 124.000 MHz (AM) 154.610 MHz (FM) 406.000 MHz (FM) 5 ALIGNMENT PROCEDURES PLL2 VCO Alignment Control Setting OFF/VOLUME control: ON. SQUELCH control: Fully counterclockwise (CCW). Select channel 004. Test Instrument Connection Connect DC SSVM to TP3. See Figure 1. Adjust L23 Result Adjust L23 to 2.0 volts on the DC SSVM. See Table 2 and 3. PLL1 VCO1 Alignment Control Setting OFF/VOLUME control: ON. SQUELCH control: CCW. Select channels 000 and 001. Test Instrument Connection Connect DC SSVM to TP2. See Figure 2. Adjust L22 Result 1. Select channel 000 and adjust L22 to 18.0 volts on the DC SSVM. See Table 3. 2. Select channel 001 and be sure the DC SSVM reads 2.0-5.0 volts. (No adjustments are necessary for the coil.) See Table 2. PLL1 VCO2 Alignment Control Setting OFF/VOLUME control: ON. SQUELCH control: CCW. Select channels 002 and 003. Test Instrument Connection Connect DC SSVM to TP2. See Figure 2. Adjust L27 Result 1. Select channel 002 and adjust L27 to 20.0 volts on the DC SSVM. See Table 3. 2. Select channel 003 and be sure the DC SSVM reads 1.0-4.0 volts. (No adjustments are necessary for the coil.) See Table 2. Channel 000 001 002 003 004 Frequency 960.000 MHz 25.000 MHz 1300.000 MHz 216.0025 MHz 512.000 MHz Voltage 17.0-19.0 volts at TP2 2.0-5.0 volts at TP2 19.0-21.0 volts at TP2 1.0-4.0 volts at TP2 1.8-2.2 volts at TP3 DC SSVM Table 2 DC SSVM Unit Under Test TP3 Unit Under Test TP2 Figure 1 6 Figure 2 Adjustment of Coils L22, L23, and L27 Use non-metallic tuning tool Each coil should be adjusted carefully by changing the pitch of the coil little by little using a nonmetallic tuning tool as shown in Figure 3. Increase the pitch of the coil when the measured voltage at TP2 or TP3 is higher than the voltage listed in Table 2 for the PLL2 VCO alignment, PLL1 VCO1 alignment, and PLL1 VCO2 alignment. Decrease the pitch of the coil when the measured voltage at TP2 or TP3 is lower than the voltage listed in Table 2 for the PLL2 VCO alignment, PLL1 VCO1 alignment, and PLL1 VCO2 alignment. Coil PCB Notes: Figure 3 l Be very careful when doing coil pitch adjustment because it greatly affects the frequency. l Secure the coil with glue after alignment. Be sure the glue is dry and the coil is secured. Also, be sure that the environmental temperature is normal. Then, repeat VCO (PLL2 and PLL1) alignments on Page 6. Table 3 455 kHz FM Discriminator Coil Alignment Control Setting OFF/VOLUME control: ON. SQUELCH control: CCW. Select channel 010. Test Instrument Connection Connect the signal generator to the ANT jack and the DC SSVM to TP4. See Figure 4. Adjust T2 Result Set the signal generator freuqency to 154.610 MHz, 100 uV output (no modulation) and adjust T2 for 1.3 +/- 0.05 volts on the DC SSVM. DC SSVM ANT. Jack FM Signal Generator Unit Under Test TP4 Figure 4 1st IF (380.8 MHz) Coil Alignment Control Setting OFF/VOLUME control: ON. SQUELCH control: CCW. Select channel 009. Test Instrument Connection Connect the signal generator to the ANT jack and the oscilloscope and an 8-ohm dummy load to the headphone jack. See Figure 5. Adjust T1 Result 1. Set the signal generator freuqency to 124 MHz, AM: 60% modulation at 1 kHz and RF output under 1 uV. 2. Adjust T1 for maximum sensitivity. Oscilloscope ANT. Jack AM Signal Generator Unit Under Test Headphone Jack 8ohm Figure 5 7 3rd Local Alignment Note: You must adjust Reference Frequency Osc. Alignment before you adjust this procedure. Control Setting OFF/VOLUME control: ON. SQUELCH control: CCW. Select channels 006, 007 and 008. Test Instrument Connection Connect the signal generator to the ANT jack and frequency counter to TP5. See Figure 6. Adjust VR2 VR3 VR4 Result 1. Set the signal generator freuqency to 173.390 MHz (No modulation). Select channel 006 and adjust VR4 so the frequency is 455 kHz +/- 10 Hz. 2. Set the signal generator freqeuency to 173.420 MHz ( No modulation). Select channel 007 and adjust VR2 so the frequency is 455 kHz +/- 10 Hz. 3. Set the signal generator frequency to 154.5475 MHz (No modulation). Select channel 008 and adjust VR3 so the frequency is 455 kHz +/- 10 Hz. Frequency Counter FM Signal Generator TP5 ANT Unit Under Test Figure 6 IF (380.8 MHz) Trap Adjustment Control Setting OFF/VOLUME control: ON. SQUELCH control: CCW. Select channel 011. Test Instrument Connection Connect the signal generator to the ANT jack and oscilloscope to headphone jack across 8-ohm dummy load. See Figure 7.. Adjust L2 Result 1. Set the signal generator frequency to 380.750 MHz, FM: 3 kHz deviation at 1 kHz. 2. Adjust L2 to decrease the sensitivity. 3. Set the signal generator frequency to 406.000 MHz, FM: 3 kHz deviation at 1 kHz and check that the scanner receives the signal. Oscilloscope ANT. Jack FM Signal Generator Unit Under Test Headphone Jack 8ohm Figure 7 8 TROUBLESHOOTING Reception Check Power ON Is the display normal? YES NO Is EEPROM check program OK? NO Defective IC201. YES Defective IC204 and/or associated circuit. Is the voltage of TP2 about 18 V at 960 MHz? NO Defective IC7 and/or associated circuit. EEPROM check program procedure as follows: YES Power on the scanner. Microprocessor is OK. Press 0 while the scanner shows Welcome to Digital Trunking. The scanner shows System Tests Select Test Exits if no Key Press. Then press 5. The scanner shows EEPROM Test Erase Memory ENTER if YES CL to EXIT. Then press ENTER. The scanner shows EEPROM TEST Mode and automatically starts the EEPROM test program. When the scanner shows EEPROM OK! , this scanner's EEPROM have no problem. Turn off the scanner. Note: This procedure (EEPROM check program) clears all information you stored in the scanner's working memory. 9 Turn on the scanner, then the scanner initialize the working memory. Microprocessor Check Power ON. Does the display work properly? YES NO NO Does the key entry work properly? YES NO Does 3.5 volts exist at IC204 pin 30? Defective key contact. YES Defective IC12. IC204 is OK. Is the clock oscillation normal at pin 22 of IC204? NO YES Defective X201 and/ or associated circuits of IC204. Defective IC204. 10 Audio Section No audio Is there any audio at pin 2 of IC9? YES NO Defective IC2. Does 5 V exist at IC9 pin 7? YES NO Defective IC8 and/or R107. Defective IC9 and/or associated circuit. 11