Motorola P8190 Service Manual Page 128
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TDMA StarTAC
TM
P8190: DOUB Supply/Backlight
A30
Description
There are some circuits that require a voltage higher than the battery source. For this reason, a voltage doubling charge pump circuit is provided. U1501 takes the 2.75V
source and oscillates it with a high peak to peak signal. The positive region of the signal is then sent out to produced the VDOUB supply. When the transceiver is in sleep
mode, U1501 is disabled and the VDOUB supply will be the same level as the 2.75V supply.
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 Q1720 on. This will allow B+ to supply the BKLT_CNTL line. As a result, the display backlighting will illuminated.
U1501
2.75V
BAT_SAV
VDOUB
Q1720
B+
BKLT_CNTL
BACKLIGHTING
CR1540
- Model P8190 1
- COMPUTER SOFTWARE COPYRIGHTS 2
- About This Manual 4
- Specifications 6
- Function Specification 7
- Table of Contents 8
- Cellular Overview 13
- US Cellular Frequency Band 14
- 832 channels 14
- Analog Cellular 17
- Cellular System 18
- AMPS Deviation in kHz 19
- Going Into Service 21
- © 2000 Motorola, Inc 24
- Figure 9. Cell Site Handoffs 26
- Cellular Telephone 27
- Landline Network 27
- Switch / Cell Site 27
- Amplitude (voltage) 29
- A B C A B C 31
- Accessories 33
- Easy Installation Car Kit 35
- TDMA Easy NAM 37
- Programming 37
- Programming Sequence 38
- Introduction 39
- Entering Test Mode NAM 39
- NAM Programming Steps 39
- IMPORTANT 40
- Factory 41
- Description 41
- Manual Test Mode 45
- Servicing Level 46
- Status Display Line 1 47
- Status Display Line 2 47
- Test Procedures 49
- MCEL 2000 Modifications 50
- Test Connections 51
- CALL CNTL 53
- CALL CNFG 53
- ANLG MEAS 53
- SPEC ANL 53
- DIG MEAS 53
- 834.9900 55
- Set up for TDMA call 60
- >= -51 61
- < 0.01 61
- BER Measurements 62
- TX Power Measurements 63
- -2.35879 64
- Disassembly 67
- Antenna Removal 68
- Opening Housing 68
- Board Remova 71
- Flip Removal 73
- Speaker / Vibrator Removal 75
- Opening Housing using fixture 77
- Board Assembly 79
- Closing housing 80
- Parts List 81
- TDMA TIMEPORT P8190 82
- Move Cursor here 83
- Theory of Operation 89
- Merlin IC 90
- TX Offset Oscillator 90
- Amp Drivers 91
- PA Circuit 91
- RF Detect Circuit 91
- Analog/Digital Switch 92
- DCI (U1800) 92
- GCAP2 (U1500) 92
- Audio/Thermistor 93
- Charger/Batt Select 93
- DOUB Supply/Backlight 94
- Reference Oscillator 94
- STUART (U1700) 94
- DSP (U1900) 95
- Call Processor (U1000) 96
- Analog TX Audio Processing 96
- Digital TX Audio Processing 97
- Test Point Measurements 99
- TDMA StarTAC 100
- P8190: Antenna Circuit 100
- A ntenna Circuit 101
- P8190: RX Front End IC(U11) 102
- RX Front End IC(U11 ) 103
- P8190: Custom IC(U110) 104
- Custom IC(U110) 105
- P8190: VCO/Vibrator 106
- VCO/Vibrator 107
- P8190: TX Offset Oscillator 108
- TX Offset Oscillator 109
- TDMA S ta rTAC 110
- P8190 : Merlin TX(U301) 110
- Merlin TX (U301) 111
- P8190 : Am p D r i v e r s 112
- Am p D r i ve r s 113
- P8190 : PA Circuit 114
- PA Circuit 115
- P8190: RF Detect Circuit 116
- RF Detect Circuit 117
- P8190: Analog/Digital Switch 118
- Analog/Digital Switch 119
- P8190: DCI(U1800) 120
- P8190: DCI(U1800) 121
- P8190: GCAP2(U1500) 122
- GCAP2(U1500) 123
- P8190: Audio/Thermistor 124
- P8190: Charger/Batt Select 126
- Charger/Battery Select 127
- P8190: DOUB Supply/Backlight 128
- DOUB Supply/Backlight 129
- P8190: Reference Oscillator 130
- Reference Oscillator 131
- P8190: STUART(U1700) 132
- STUART(U1700) 133
- P8190: DSP(U1900) 134
- DSP(U1900) 135
- P8190: Call Processor(U1000) 136
- CALL PROCESSOR(U1000) 137
- P8190: Memory 138
- P8190: MEMORY 139
- B+ Disconnect/Status LEDs 141
- P8190: Alert/Headset Detect 142
- Alert/Headset Detect 143
- JIB Connector 144
- P8190: CONNECTORS 145
- Lay out Side 1 146
- Board Issue: P11 146
- Lay out Side 2 147
- FL454 Q401 148
- Thunder Lite 149
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