Motorola Cm Radio Midband 66 88mhz Information Manual

Troubleshooting Flow Chart for Receiver (Sheet 1 of 2) 3-11
5.1Troubleshooting Flow Chart for Receiver (Sheet 2 of 2)
IF Signal at 
C58?
No
RF Signal at T1?
RF Signal at 
C2337?
No
RF Signal at 
C2308?
No
RF Signal at 
C1108?
No or 
Check Harmonic Filter 
J1 and
Antenna Switch 
D103,D104,L1514
Check filter between C1108 
& C2308. Check tuning 
voltage at R2309
Inject RF into J1
Is tuning 
voltage OK?
No
Ye s
Check RF amp 
(Q2301) Stage
Check filter between 
C2337 & T1
Ye s
Check T1, T2, U1 (diode), 
R41,...

3-12TROUBLESHOOTING CHARTS
6.0 Troubleshooting Flow Chart for DC Supply (1 of 2)
Since the failure of a critical voltage supply might cause the radio to automatically power down, 
supply voltages should first be probed with a multimeter. If all the board voltages are absent, then 
the voltage test point should be retested using a rising-edge-triggered oscilloscope. If the voltage is 
still absent, then another voltage should be tested using the oscilloscope. If that voltage is present, 
then the original...

Troubleshooting Flow Chart for DC Supply (1 of 2) 3-13
6.1 Troubleshooting Flow Chart for DC Supply (2 of 2)
Check VDC on
C5007
V=3.3V
?Check Voltage on 
C5041NoGo to Digital SectionYe s
9v

3-14TROUBLESHOOTING CHARTS 

Chapter 4
MIDBAND PCB/SCHEMATICS/PARTS LISTS
1.0 Allocation of Schematics and Circuit Boards
1.1 Midband and Controller Circuits
The Midband circuits are contained on the printed circuit board (PCB) which also contains the 
Controller circuits. This Chapter shows the schematics for both the Midband circuits and the 
Controller circuits. The PCB component layouts and the Parts Lists in this Chapter show both the 
Controller and Midband circuit components. The Midband and Controller schematics and the...

4-2Midband PCB/Schematics/parts lists 

Midband 1-25W PCB 8489012U01 (rev. C) / Schematics4-32.0 Midband 1-25W PCB 8489012U01 (rev. C) / Schematics
J1
M4 C1518
C1519 C1520 C1521
C1532 C1534
C1538
D104 L1512
L1513 C1006 C1010
C1108 C1121
C1536
D103
L108L1514
R108
FL2 43
R7R16
FL3 43
2 FL42FL5
R8 R18
C13
C14
M1
4
58U3
C53
C54
C57
C2338
D6
L16R4
R9R10 R12
R19R27
R36
2
4 3
1Y2
C2207
C2209 L3
11
1 20
10 U2
C11
C12
C18
C19 C20C17
D5
R20R26
R28D3
D42 Q3R6R15R17
R35
C16 C58R312 Y1
C2
C3
C9
C10
C15
C21C22
R14
R21
R23 R30
R33
C1035
C1078
Q106
R107...

4-4Midband 1-25W PCB 8489012U01 (rev. C) / Schematics
C417
C5037C5055C5119
D402
2 Q506
R402
R403
R404
R405R407
R421R600
R5020
R5023
R5025
R5030
R5036 R5049
R5062R5091 R5092
VR503 2
VR6922
VR694
2
VR697 2
VR698
2
VR699
C5002C5063
C5092
C5094
C5120
2
D501 Q502
2
Q505
Q507
R5007
R5037
R5069
R5103 TP555
TP5562 U511
VR502
C5031
C5036
C5049
C5058C5072
C5073
C5075
C5077
C5082
C5091C5097
C5098
C5104
232
31L501L502 Q501
R446
R455 R5008
R5013 R5014
R5026 R5041
R5051
R5058R5059
R5060R5061
U401
1
4 5 8
U507
2 VR402...

Midband 1-25W PCB 8489012U01 (rev. C) / Schematics4-5
FILT_SW_B+
D3_3V FILT_SW_B+D3_3V
SPI_MISO SPI_MOSI TX_EN SPI_CLK
SQ_DET SYNTH_CS
SYNTH_LOCKRSSI RX_EN
ASFIC_CS
CH_ACT
HSIO LOC_DIST
LSIO
VS_AUDIO_SEL
VS_CS
VS_GAIN_SELVS_INT
VS_RAC uP_CLK
RESETF1200
OPT_DATA_R_OPBDOPT_EN_OPBD
SCI_CH SHIFT_R_CS
BOOT_EN_IN_CH COMM_DATA_SEL_CHDISPLAY_CS_CH
KEYPAD_COL_CH
KEYPAD_ROW_CH
MIC_PTT_CH
HOOK_CH
VOL_INDIRECT
VOX VSTBY
ONOFF_SENSE
BATT_SENSE EMERGENCY_SENSE
PROG_I-ACC_C_3
PROG_I-ACC_C_6
PROG_IO-ACC_C_12...

4-6Midband 1-25W PCB 8489012U01 (rev. C) / Schematics
C1068
2200pF BIAS_ADJ_ENB+
B+
R130
0
39K R100 V_CTRL_PREDRIVER2.2K R168 C1069
1000pF
1000pFC1072
C1060
1n C1053
1000pF
R165
2.4K 9
10 84
11
MC3303U103R137
39.K
FILT_SW_B+_PA
VCNTR1R122
4.7 FLT_9V
R171
470 1000pFC1119 C1110
150pF
6.8nHL107
1n C1041.022uF C1039
C1057
2200pF 2200pF C1074
150nHL105
680nHL104
C1031
.022uFVCNTR2
0611077A01:STD
L1506
100nH C182
33pFR1506
10
51pF C152556nH L1507
C1527
43pF C1526
43pF
43pF C1524
C1043
2200pF5.6K R159
2200pF...