Motorola M3097 Service Manual Page 115
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TDMA M3090/M3097: Charger
B32
Description
CHG-
R1305
SW_EXT_B+
Q1304A
Q1304B
B+
CR1300
SW_EXT_B+
BATT+
CHRGC
C1300
SW_EXT_B+
ISENSE
R1300
Q1301
CR1301
Q1302
BACKLIGHTING
Q1401
Q1400
R1306
BKLT
BATT+
BATT_FDBK_EN
BATT_FDBK
Q1303
The internal charger will be activated only when there is an external power source of 8.0V ± 0.4V for the fast charger, 7.05V ±0.35V for the midrate charger, a Motorola
battery is attached, and BATT_FDBK is enabled. As SW_EXT_B+ passes thru R1566, U1500 (GCAP) reads the charge current for proper control of the charger. CHRGC
controls the rate of charge to the batteries by varying the gate biasing of Q1561. The output of Q1561 is split into two different sections. The one section is the
BATT_FDBAK line. BATT_FDBK_EN switches Q642 on or off to disable or enable BATT_FDBAK. When BATT_FDBK is not available, the external supply will
lower it's supply to a normal operating voltage and the internal charger will be turned. The second section is the line to charge the batteries.
DHFA and CLA are detected by internal pulldown resistors, 3.0Kohm on the MAN_TEST line and 56Kohm on the CMP line for DHFA, 33.2Kohm on the MAN_TEST
line for CLA. DHFA/CLA EXTB+ voltage tracks 1.4V above the battery voltage to a maximum of 7.5VDC as long as BATT_FDBK is enabled. If there is no
BATT_FDBK, EXTB+ from the CLA or DHFA is 5.4VDC.
CHG- is there to prevent alkaline batteries from ever receiving charge current, which would be a safety concern. Rechargeable Motorola battery packs have this pin tied to
BATT_GND. A low at CHG- would switch on Q1304A and switch off Q1304B allowing for battery charging. A high would disable battery charging by forcing the gate
of Q1302 with external B+ causing Q1302 to turn off.
Q1301 is simply a switch that determines which power source is going to be used. When SW_EXT_B+ (external B+) is present, Q1301 will be switched off not allowing
BATT+ to be the power source. If SW_EXT_B+ is not present, Q1301 will switch on, letting BATT+ be the power source.
The display backlighting is controlled by the Call processor (U1000). U1000 sends a control signal via the BACKLIGHTING line. A high state at the BACKLIGHTING
line will switch Q1401 on. This will complete the display circuit's path to ground. As a result, the display backlighting will be illuminated.
- TDMA M3090/M3097 1
- Service Manual 1
- Level III 1
- COMPUTER SOFTWARE COPYRIGHTS 2
- About This Manual 4
- Specifications 6
- ©1999Motorola, Inc 7
- Table 3. DAMPS System 7
- Table 4. Environment 7
- Table of Contents 8
- Section B 11
- Cellular Overview 12
- US Cellular Frequency Band 13
- 832 channels 13
- Analog Cellular 16
- Cellular System 17
- AMPS Deviation in kHz 18
- Going Into Service 20
- ©1999 Motorola, Inc 23
- Figure 9. Cell Site Handoffs 25
- Cellular Telephone 26
- Landline Network 26
- Switch / Cell Site 26
- Amplitude (voltage) 28
- Microphone Speaker 30
- Accessories 32
- TDMA Easy NAM 34
- Programming 34
- Programming Sequence 35
- TDMA Test Mode 36
- NAM Programming 36
- IMPORTANT 37
- Factory 38
- Manual Test Mode 42
- Servicing Level 43
- Status Display Line 1 44
- Status Display Line 2 44
- Test Procedures 46
- Zero Bd-P3 47
- RF Cable Test 48
- Set up for Analog call 49
- RX Sensitivity Test (SINAD) 50
- TX Power Out Test 51
- 834.9900 52
- TX Maximum Deviation Test 53
- TX SAT Deviation Test 54
- TX ST Deviation Test 55
- On / Off 56
- ON / Off 56
- Set up for TDMA call 58
- >= -51 59
- < 0.01 59
- BER Measurements 60
- TX Power Measurements 61
- -2.35879 62
- Disassembly 64
- Battery Removal 65
- Antenna Removal 66
- Back Housing Removal 66
- Transceiver Board Removal 67
- Display Removal 67
- Keypad Removal 68
- Speaker Removal 68
- TDMA M3090/M3097Disassembly 69
- Parts List 70
- TDMA M3090/M3097Parts List 71
- General Description 72
- 1900 MHz IC 73
- TX Operational Description 73
- Analog TX Audio Processing 74
- Digital TX Audio Processing 74
- DSP Lucent 1629 74
- Stuart IC 75
- Figure 40. RF Block Diagram 76
- Figure 41. AL Block Diagram 77
- Electrical Parts List 78
- Service Diagrams 84
- Internal External 86
- 800*_1900 87
- -30.47 dBm@Cellular 88
- 992.31MHz 88
- RF_19.44MHZ 90
- TDMA M3090/M3097: VCO 91
- TX SIGNAL 94
- VCC_OFFSET 96
- OVCO_OUT 96
- TDMA M3090/M3097: Amp Drivers 97
- TX ON TX OFF 100
- Description 101
- DET_800_1900 102
- -10 dBm 106
- -11 dBm 106
- TDMA M3090/M3097: DCI (U201) 107
- TDMA M3090/M3097: DCI(U201) 108
- BLOCK DIAGRAM NOT NECESSARY 109
- REFER TO PAGE B27 109
- MIC_BIAS 110
- AUDIO_OUT 110
- [email protected] 110
- VOLTAGE SUPPLIES 112
- SW_EXT_B+ 114
- TDMA M3090/M3097: Charger 115
- Battery type 116
- BLOCK DIAGRAM NOT NECESSARY 117
- REFER TO PAGE B35 117
- U1000,U1500 118
- TDMA M3090/M3097: Headset/MIC 119
- TDMA M3090/M3097: DSP (U1900) 121
- TDMA M3090/M3097: DSP(U1900) 122
- REFER TO PAGE B41 123
- U201,CR1561 124
- REFER TO PAGE B43 125
- BOOM_MIC_DET 126
- U1700,U1200 126
- U1500,U1800 126
- TDMA M3090/M3097: Memory 127
- TDMA M3090/M3097: MEMORY 128
- TDMA M3090/M3097: Keypad 129
- Board Issue: P5 132
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