Motorola Cdm And Pro Series Detailed 68p81091c63 O Manual
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Maintenance3-7 3.7 Receiver Troubleshooting Chart Bad SINAD Bad 20dB Quieting No Recovered AudioSTART Audio at pin 8 of U3101?Check Controller (in the case of no audio). Or else go to “B” Ye s No Spray or inject 44.85MHz into XTAL Filter FL3101. Audio heard?BYe s No Check 2nd LO (44.395MHz) at C3135. LO present?BYe s Check volt- ages on U3101. OK? Biasing OK? No No A Ye sCheck Q3102 bias for faults. Replace Q3102. Go to B Ye s No Troubleshooting Flow Chart for Receiver (Sheet 1 of 2) Check cir- cuitry around U3101. Replace U3101 if defect. Check circuitry around Y3101. Replace Y3101 if defect.
3-8Maintenance IF Signal at C3101? No RF Signal at T4051? RF Signal at C4015? No RF Signal at C4009? No RF Signal at C4025? No or Check harmonic filters L4491-L4493, C4492 and ant.switch D4471,D4472,L4472. Check filter between C4025 & C4009. Check tuning voltage at R4060. Inject RF into J4401 Is tuning volt- age OK? No Ye s Check RF amp (Q4003) Stage. Check filter between C4015 & T4051. Ye s Check T4051, T4052, D4051, R4052, L4008. Ye s 1st LO level OK? Locked?Ye s Check FGU Ye s Trace IF signal from C3101 to Q3101. Check for bad XTAL filter. No Ye sIF signal at Q3102 collec- tor? Before replacing U3101, check U3101 voltages. Ye s Check for 5VDC Is 9V3 present? Check Supply Voltage cir- cuitry. Check U0611 and U0641. No No No Check U4501. Check varactor filter. NoYe s Ye s Ye s A A B weak RF Troubleshooting Flow Chart for Receiver (Sheet 2 of 2)
Maintenance3-9 3.8 Synthesizer Troubleshooting Chart 5V at pin 6 of D4201 Is information from mP U0101 correct? Is U4201 Pin 47 at = 13VDC Is U4301 Pin 19 4.5 VDC in TX? (at VCO section) Start Visual check of the Board OK?Correct Problem Check 5V Regulator U4211 +5V at U4201 Pin’s 13 & 30? Is 16.8MHz Signal at U4201 Pin 19? Check Y4261, C4261, C4262, C4263, D4261 & R4261 Are signals at Pin’s 14 & 15 of U4201? Check R4201 Check C4381 Is U4201 pin 2 >4. 5 VD C i n Rx &
Maintenance
3-11
3.9 VCO Troubleshooting Chart
l
LOW OR NO RF SIGNAL
AT TP4003VISUAL CHECK
OF BOARD
OK?4.5V DC AT
U4301 PIN 14&1835mV DC AT
U4301 PIN 19ARE Q4301
BASE AT 2.4V
EMITTER AT 1.7V COLLECTOR AT 4.5V
CORRECT
PROBLEM NO
YES
MAKE SURE SYNTHESIZER IS
WORKING CORRECTLY AND
RUNNER BETWEEN U4201 PIN
28 AND U4301 PIN 14&18 IS OK.
CHECK RUNNER
BETWEEN U4201 PIN 2
AND U4301 PIN 19REPLACE Q4301
IS RF AVAILABLE
AT BASE OF Q4332
IF ALL PARTS FROM U4301
PIN 8 TO BASE OF Q4332 ARE
OK, REPLACE U4301
ARE Q4332
BASE AT 0.7V
EMITTER AT 110mV COLLECTOR AT 4.5V
IF ALL PARTS ASSOCIATED
WITH THE PINS ARE
OK, REPLACE Q4332
IF ALL PARTS FROM COLLECTOR
OF Q4332 TO TP4003 ARE
OK, REPLACE Q4332
NO
NO
NO
NO
NO YES
YES
YES
YES
YES
RX VCO
LOW OR NO RF SIGNAL
AT INPUT TO PA
VISUAL CHECK
OF BOARD
OK?4.5V DC AT
U251 PIN 14&184.8V DC AT
U4301 PIN 19ARE U251 PINS
13 AT 4.4V
15 AT 1.1V
10 AT 4.5V16 AT 1.9VIS RF AVAILABLE
AT TP4534
IF ALL PARTS ASSOCIATED
WITH THOSE PINS ARE
OK, REPLACE U4301IF R4361 AND L4361 ARE
OK, REPLACE U4301
IF ALL PARTS FROM TP4534
YESYESYESYESYES NO
NO
NO
NO
NO
POWER OK BUT
NO MODULATIONAUDIO = 180 mVRMS
AT “-” SIDE OF
C4325
4.5VDC
AT CR4321
IF C4321 AND R4321
ARE OK, THEN
REPLACE CR4321
REPLACE
R4322REPLACE C4325
NONO
YES
YES
TX VCO
TO U4401 PIN 16 ARE OK,
REPLACE U4301
4-1 Chapter 4 Schematic Diagrams, Overlays, and Parts Lists 4.1 Introduction This chapter provides schematic diagrams, overlays, and par ts lists for the radio circuit boards and interface connections. 4.1.1 Notes For All Schematics and Circuit Boards * Component is frequency sensitive. Refer to the Electrical Par ts List for value and usage. 1. Unless otherwise stated, resistances are in Ohms (k = 1000), and capacitances are in picofarads (pF) or microfarads (µF). 2. DC voltages are measured from point indicated to chassis ground using a Motorola DC multime- ter or equivalent. Transmitter measurements should be made with a 1.2 µH choke in series with the voltage probe to prevent circuit loading. 3. Reference Designators are assigned in the following manner: 800-900 = Control Heads 100/200/400/500/600 Series = Controller 100/200/400/500/600/3000/4000 Series = UHF Transmitter 3000 Series = VHF Transmitter 4. Interconnect Tie Point Legend: UNSWB+ = Unswitched Battery Voltage (12V) SWB+ = Switched Battery Voltage (12V) R5 = Receiver Five Volts CLK = Clock Vdda = Regulated 5 Volts (for analog) Vddd = Regulated 5 Volts (for digital) CSX = Chip Select Line (not for LVZIF) SYN = Synthesizer DACRX = Digital to Analog Voltage (For Receiver Front End Filter) VSF = Voltage Super Filtered (5 volts) VR = Voltage Regulator
4-2Introduction LAYER 1 (L1) LAYER 2 (L2) LAYER 3 (L3) LAYER 4 (L4) LAYER 5 (L5) LAYER 6 (L6) INNER LAYERS SIDE 1 SIDE 2 6-LAYER CIRCUIT COPPER STEPS IN PROPER LAYER SEQUENCE BOARD DETAIL VIEWING
4-3 D0871 D0872 D0873 D0874 D0875 D0876 D0877D0878D0879 D0881 D0884 D0885 D0886 D0887 D0888 2 3 5 7 9 864 10 J0811JU0852 JU0853 JU0854 4 1 235 R0823 S0861 S0862 S0863 S0864S0865 S0866 ZWG0130114 1 Figure 4-1. PRO3100/CDM750 Control Head Top Overlay
4-4 0 C0802 C0803 C0804 C0805 C0806 C0808 C0809 C0810C0811 C0813 C0815 C0816C0817 C0818 C0819 C0821 C0822 C0823C0824 C0831 C0832 C0833 C0843 D0821 D0822 D0831 12J0801 1 2 P0801Q0821Q0822 Q0823 Q0841 Q0843Q0871 Q0872 Q0873 Q0874 Q0875 Q0876Q0877 Q0878 Q0879 Q0881 Q0885R0810 R0811 R0812 R0813 R0814 R0815 R0816 R0821 R0822 R0824 R0825 R0831 R0832 R0833 R0834 R0835 R0836 R0837 R0838 R0839R0841 R0842R0843 R0844 R0845R0847 R0849 R0852 R0853R0854 R0861R0862R0864 R0866R0867R0871 R0872 R0873 R0874 R0875 R0876R0877 R0878 R0879 R0880R0881 R0885 TP0831 TP0832TP0833 TP0834TP0835 TP0836 TP0837 TP0838 1 4917 33 U0831 1 4 5 8U0832 3U0833 VR0811 VR0816 VR0817 VR0821VR0822 VR0823 1 64 4832 16 ZWG0130113 Figure 4-2. PRO3100/CDM750 Control Head Bottom Overlay