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Summary of Contents for Eton e1
- Page 1 ® SATELLITE RADIO POWER SQUELCH 11:41 TREBLE BASS TUNING VOLUME FAST TUNING LOCK TIME < SELECT > SEEK CLEAR/LOCK STORE DELETE T. SCAN model 1 receiver THEORY OF OPERATION and ALIGNMENT...
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Page 2: Safety Instructions
SAFETY INSTRUCTIONS SAFETY PRECAUTION metallic parts, one at a time. Measure The AC voltage across the combination of 1500 ohms resistor and 0.15 mF capacitor. Reverse the AC plug at the AC outlet and WARNING: Service should not be attempted by repeat AC voltage measurements for each exposed anyone unfamiliar with the necessary precautions on this metallic part. -
Page 3: Table Of Contents
Figure 12: 16 – 30 MHz (preamp on)..........14 Figure 2: Front Panel Board Block Diagram........10 Figure 13: 45 MHz Crystal ..............15 Figure 3: E1 XM Interface Board Block Diagram........ 11 Figure 14: VHF High (preamp off)............. 17 Figure 4: Audio Board Block Diagram..........12 Figure 15: VHF High (preamp on)............. -
Page 4: E1 Theory Of Operation
E1 THEORY OF OPERATION RF BOARD Please refer to the E1 Main Board Block Diagram (Figure 1) as you follow this description. References will also be made to components shown on the “SCH. Main RF Board” schematic drawings 1 thru 6. -
Page 5: Envelope Detection, Agc, And S-Meter
source of Q65 thus producing a 455 kHz second I.F. AGC1 voltage is also applied to pin 3 of U2. A DC signal. reference voltage controlled by the S-Meter Full Scale This signal is then amplified by Q77, the gain of pot (R453) is applied to pin 2 of U2. -
Page 6: Fm (Vhf) Section
For SYNC DSB operation, and in SSB mode when kHz (910 kHz). It is a perfectly symmetrical signal, so the ENHANCED SSB has been disabled, U10 switches off Johnson counter only needs to divide it by two to provide the quadrature audio path (SSB_DSB line), leaving only the two signals, 90 degrees apart. -
Page 7: Hf And Fm Local Oscillator
and right audio, and a stereo indication that is sent to the processor and is fed through Q51. The /SQUELCH line front panel board display. The left and right audio are is generated by U2 depending on the SQUELCH control each buffered, and passed through separate 15.5 kHz setting and is fed through Q52. -
Page 8: Figure 1: Main Board Block Diagram
Figure 1: Main Board Block Diagram... -
Page 9: Front Panel Board
FRONT PANEL BOARD Please refer to the E1 Front Panel Board Block Diagram (Figure 2) as you follow this discussion. References will also be made to components shown on the “SCH. Front Panel” schematic sheets 1 and 2. Power Supply... -
Page 10: Figure 2: Front Panel Board Block Diagram
Figure 2: Front Panel Board Block Diagram... -
Page 11: Xm Interface Board
XM INTERFACE BOARD Please refer to the E1 XM Interface Board Block Diagram (Figure 3) as you follow this discussion. References will also be made to components shown on the “SCH. XM RADIO INTERFACE” schematic. Power Supply U12 (pin 14 out) combines the two current... -
Page 12: Figure 4: Audio Board Block Diagram
AUDIO BOARD Please refer to the E1 Audio Board Block Diagram (Figure 4) as you follow this discussion. References will also be made to components shown on the “SCH. AUDIO SAT 900” schematic. Power from V_BAT on the main board is applied to The treble path is formed by R28 (dual 10 KÙ... -
Page 13: Eton E1 Alignment Procedure
ETON E1 ALIGNMENT PROCEDURE RF BOARD Before alignment is attempted, carefully examine the board for cold solder joints, solder bridges, and missing or incorrectly inserted parts. The board must be connected to a suitable controller or front panel board. A working audio board should also be used for listening during certain tests. -
Page 14: Figure 7: 1 - 2 Mhz (Preamp Off)
6. Enable DX (preamp on) and check for a 10 to 13 dB increase in level. (See Figure 6). 7. Disable DX (preamp off) and tune the unit to 1 MHz. Check the bandpass filter # B (1 – 2 MHz). It should look like Figure 7. -
Page 15: 45 Mhz Crystal Filter Alignment
D. 45 MHz Crystal Filter Alignment F. Main Reference Adjustment 1. Connect the tracking generator to P6 (signal 1. Select LSB mode. (Reference output will not to pin 2 and ground to pin 1). Set the level to be active in AM mode.) -30 dBm. -
Page 16: Synchronous Detector Alignment
dot on the S-meter to be displayed. K. 1 Mixer Balance Adjustment I. Synchronous Detector Alignment 1. Tune receiver and generator to 500 kHz. 1. Reset the signal generator level to -73 dBm, 2. Turn the generator modulation off, and set its with modulation still off. -
Page 17: Fm Mode
7. The insertion loss should be less than 8 dB. 8. Turn DX (the preamp) on. III. FM MODE 9. Observe a increase in level of at least 15 dB as shown in Figure 15. A. Supply Switching Test 1. Select FM mode. Figure 15: VHF High (preamp on) 2. -
Page 18: Detector Alignment
going from left to right is the same as the D. Detector Alignment separation going from right to left. 1. Make sure a jumper is installed onto the two H. Final Recovered Audio Test center pins of P5. 2. Tune the receiver to 99.5 MHz 1. -
Page 19: Sat Mode
6. There should be 1 volt p-p on the right VI. MISCELLANEOUS TESTS channel (TP33) of J3. The PHONES (J5) and EXT. SPKR (J4) jacks 7. Select MONO mode. should be tested for continuity to the appropriate pins of 8. There should be 0.5 volt p-p on either connector P8. -
Page 20: External Speaker Test
as if connecting headphones to J5 on main more than10dB. board. If using a receiver, set the unit to D. External Speaker Test stereo mode. 3. Monitor the right channel of J5, (or pin 8 of 1. Connect an external speaker to the EXT. P2) with no load. -
Page 21: Low And High Voltage Shutoff Test
E. Power Loss Detection Test 1700 memory locations should be cleared as described in the E1 Receiver Use and Care Guide. Clearing all 1700 memory 1. Set PWR_JACK line (P4, pin 17) to an open channels does not change the country names. Note that all the condition. -
Page 22: Xm Interface Board
XM INTERFACE BOARD As with other boards previously tested, carefully examine the board for cold solder joints, solder bridges and missing or incorrectly inserted parts before applying power. A test fixture containing a main (RF) board and a front panel board will be needed to test this board, or a complete working receiver can be used. -
Page 23: Final Test
FINAL TEST These tests should be performed on a unit which is completely assembled, using boards which have been tested and aligned as called out in the previous sections. left and right channels are functional. A. Inspect for appearance flaws. 2. -
Page 24: Figure 17: Main Board Test Points
Figure 17: Main Board Test Points... -
Page 25: Figure 18: Main Board Adjustments
Figure 18: Main Board Adjustments... -
Page 26: Figure 19: Front Panel Board Test Points & Adjustments
Figure 19: Front Panel Board Test Points & Adjustments SW40 SW20 (BACK SIDE OF BOARD) LCD DISPLAY (FRONT SIDE OF BOARD) -
Page 27: Figure 20: Audio Board Connections & Adjustments
Figure 20: Audio Board Connections & Adjustments (BACK SIDE OF BOARD) SPKR Volume Bass Treble Squelch (FRONT SIDE OF BOARD) SPKR... -
Page 28: Figure 21: Xm Interface Board Test Points
Figure 21: XM Interface Board Test Points...
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