Motorola Radio Mcs2000 Vol 2g 68p81080c48 O Manual
Here you can view all the pages of manual Motorola Radio Mcs2000 Vol 2g 68p81080c48 O Manual. The Motorola manuals for Portable Radio are available online for free. You can easily download all the documents as PDF.
Page 21
Theory of Operation 13 against over temperature conditions. The power control circuit senses the voltage drop across shunt resistor R3615, which is determined by the magnitude of the drain current in Q3561. This is a limit mechanism whereby the power control limits the magnitude of current that can be drawn by Q3561 to protect the device from excessive power dissipation. PA Power Control The maximum value of the PA control line is limited by R3601 and R3602, the resistor divider off of PA...
Page 22
14 Theory of Operation After keyup the circuit does not effect the performance of the power control circuit as long as the control voltage does not increase over a certain value defined by R0591/R0592 and the voltage applied to R0584 by the D/A output U0055-13. If this occurs the control voltage will be limited to the predefined value and the PA prevented from being damaged. If the radio switches from TX to RX transistor Q0556 pulls R0590 down and C0552 is discharged via R0590. This causes the...
Page 23
Reference Drawings 15 Reference Drawings 3 This section contains the reference drawings listed below for the receiver (front end, IF, and back end), transmitter, and synthesizer portions of the radio. ¥ Overall Radio: - Transceiver Board Section Locations - Page 16 - Schematic Diagram Interconnection List, Table 2 - Page 29 ¥ Receiver: - Receiver Front End Component Locations and Parts List - Page 18 - Receiver Front End Schematic Diagram - Page 19 - Receiver IF...
Page 24
16 Reference Drawings Figure 2 Transceiver Board Section Locations TRANSMITTER PA CONTROLLER AUDIO AND POWER REGULATION SYNTHESIZERRECEIVER IFRECEIVER BACK END RECEIVER FRONT END CONTROLLER COMMON MAEPF-26504-O
Page 25
Reference Drawings 17 NOTES
Page 26
18 RESISTORS: R3301 0662057A97 100K R3302 0662057A65 4700 R3303 0662057A73 10K R3304 0662057A73 10K R3305 0662057A18 51 R3306 0662057A73 10K R3307 0662057A35 270 R3308 0662057A41 470 R3309 0662057A09 22 R3310 0662057A35 270 R3311 0662057C19 4.7 R3312 0662057A01 10 R3313 0662057A49 1000 R3330 0662057A61 3300 R3341 0662057A18 51 R3343 0662057A35 270 R3344 0662057A09 22 R3345 0662057A35 270 TRANSFORMERS: T3301 2505515V03 4:1 BALUN T3302 2505515V03 4:1 BALUN T3303 2505515V07 4:1 BALUN Printed Circuit...
Page 27
19 9.3V N.U. IF_IN (TO RECEIVER IF) RX INJREG 5V 9.3V IF4-4-2 E3301 63A81090C56-O Receiver Front End (Kit HUD4012D) Schematic Diagram This document was created with FrameMaker 4.0.3 10_RFE SD p19 Page 19 Tuesday, January 19, 1999 4:57 PM
Page 28
20 FILTERS: Y3401 4805846W01 Crystal, 44.85 MHz Y3402 4805846W03 Crystal, 44.85 MHz PRINTED CIRCUIT BOARD (For Reference Only): 8402573Y06 and 8402573Y09 For Kit HUD4012D REFERENCE SYMBOLMOTOROLA PART NUMBERDESCRIPTION C3402R3410 CR3402 L3407 R3412 C3418 C3411 C3417 C3414 C3416 R3409 C3409 L3406C3419 R3403 MAEPF-26496-O L3402 Y3401 Y3402 L3401 C3401 R3401 C3335 R3404 C3407 C3403 L3403 R3408 R3405 R3414R3413 R3406 R3402 C3415 R3415 CR3401 C3408 C3410 C3412L3404C3404 C3405 R3411C3413 C3406...
Page 29
21 N.U. N.U. N.U. N.U.9.3V 9.3V 9.3V N.U.N.U.47k47k IF_IN (FROM RECEIVER FRONT END) 63A81090C57-O N.U. Receiver IF (Kit HUD4012D)Schematic Diagram This document was created with FrameMaker 4.0.3
Page 30
22 REFERENCE SYMBOLMOTOROLA PART NUMBERDESCRIPTION CAPACITORS: C3201 2113743K15 0.1 uF C3202 2113740F51 100 pF C3203 2113743K15 0.1 uF C3204 2113743A23 0.22 uF C3205 2113743K15 0.1 uF C3206 2113743K15 0.1 uF C3207 2113743A23 0.22 uF C3208 2113743K15 0.1uF C3209 2113743K15 0.1uF C3210 2113740F41 39 pF C3211 2113743A19 0.1uF C3212 2113743A23 0.22uF C3213 2113743A23 0.22uF C3214 2113741A51 0.018 uF C3215 2311049A02 0.15 uF C3216 2113743K15 0.1 uF C3217 2113740F37 27 pF C3218 2113740F41 39 pF C3219...