Motorola Tarpon V. 120C User manual

V.120c
© 2001 Motorola, Inc. 1
Motorola V.series™ 120c
CDMA 800/1900/AMPS 800
Service Manual Level 3
Revision 01

V.120c
© 2001 Motorola, Inc. 2
COMPUTER SOFTWARE COPYRIGHTS
The Motorola products described in this instruction manual may
include copyrighted Motorola computer programs stored in semi-
conductor memories or other media. Laws in the United States
and other countries preserve for Motorola certain exclusive rights
for copyrighted computer programs, including the exclusive right
to copy or reproduce in any form the copyrighted computer
program. Accordingly, any copyrighted Motorola computer
programs contained in the Motorola products described in this
instruction manual may not be copied or reproduced in any
manner without the express written permission of Motorola.
Furthermore, the purchase of Motorola products shall not be
deemed to grant either directly or by implication, estoppel, or
otherwise, any license under the copyrights, patents or patent
applications of Motorola, except for the normal non-exclusive,
royalty free license to use that arises by operation of law in the
sale of a product.
Computer Software Copyrights

V.120c
© 2001 Motorola, Inc. 3
Product Description 4
CDMA Dual Band Trimode Phone 4
General 4
V.120c Logic Circuit 5
Key Features of the Wally IC 5
Key Features of the CCAP IC 5
V.120c RF Circuit 6
Theory of Operation 7
AMPS 7
Receiver Circuitry 7
Receiver Audio 7
Transmitter Audio 7
Transmitter Circuitry 8
CDMA Cellular (800Mhz) Mode of Operation 8
Receiver Circuitry 8
Receiver Audio 8
Transmitter Audio 8
CDMA PCS (1900Mhz) Mode of Operation 9
Receiver Circuitry 9
Receiver Audio 9
Transmitter Audio 9
Transmitter Circuitry 10
Frequency Synthesizer Circuitry 10
Transmit Power Control Circuitry 10
Audio Logic Block Diagram 11
RF Side Block Diagram 12
Disassembly Procedure 13
Introduction 13
Recommended Tools 13
Disassembly Procedure 13
Assembly Procedure 13
Troubleshooting 17-58
Replacement Parts 59
Mechanical Exploded Diagram 59
Contents

V.120c
© 2001 Motorola, Inc. 4
CDMA DUAL BAND
TRI MODE PHONE
General:
Tarpon V. 120C Product Description
V.120C also known as Tarpon is based on CDMA platform
2000 reference architecture. This is a Dual Band Tri Mode
phone-1900Mhz CDMA /800 Mhz CDMA/ 800Mhz AMPS.
Innovative contoured design combine style and comfort in a
small, sleek phone available in two colors,
Arctic silver and Navy Blue which can be personalized through
interchangeable phone Wrap which are available in different
colors and materials.
Large 96 X 64 Graphic LCD Display offering 4 lines of text, 1
line of icons and 1 line of prompts, improved usability with the
new synergy user interface.
WAP 1.1 enabled micro browser, voice recognition driven
dialing and short cuts, 32 alert tones,vibraCalldiscreet alert,
Mobile originated and Mobile terminated SMS messaging,
Fixed stub antenna.
A complete line of accessories, including FM stereo, Phone
wrap covers, travel charger, headsets, vehicle power adapter,
swivel belt clip and data connectivity kit.
19 keys on the keypad for synergy support. Volume keys and
smart key on the sides. Integrated headset jack on the top above
which is the power button and service indicator LED.
Accessory connector: 17 pin CE bus connector,
access to USB, RS232, power, ground, analog and digital
audio, FM stereo headset.
Batteries: Lithium ion (600 mAh -6mm and 1100 mAh -8mm)
Product Description

V.120c
© 2001 Motorola, Inc. 5
V.120c LOGIC CIRCUIT
The main chip sets of Platform 2000 reference architecture
products consists of WALLY and CCAP IC. The memory
chips are the FLASH and the RAM.The WALLY includes the
functionality of CPU + DSP + CSP + CIA. The WALLY is M-
Core product (Motorola Proprietary) 32 bits. The CCAP IC
works in Buck mode and provides the power management
function of the phone. It also does the audio amplification and
routing. It controls the 32Khz crystal, it interfaces with
WALLY on 8 bit Parallel Bus. The communication to the
accessories through the CSS bus connector is done through the
CCAP IC. The audio through the external connector is digital.
All audio interface is through CCAP IC-Alert, Phone Speaker,
headset speaker & Microphone, External Speaker &
Microphone, and Phone Microphone
The Wally IC integrates the functionality of Casper IC (which
contains the MCU,
RIB, the CSP and the DSP) and CIA
Key features of the WALLY IC:
-M-Core integer processor, 32 bit RISC architecture
-56600 NDE-UL DSP Core running at up to 70 Mhz @ 1.8V
-MCU-DSP interface
-CDMA signal processor (CSP3) ASIC
-16 bit external memory interface for the MCU
-8 bit parallel interface for CCAP
-32-Input Interrupt Controller for the MCU
-Internal MCU ROM and RAM
-Special modules for CDMA mode
(all are MCU peripherals):
-Dual 9.8304 M samples/sec 4-bit ADCs
(RX I/Q with Receive AGC)
-Dual 4.9152 M samples/sec 9-bit DACs
-13-bit linear CODEC
-1-8bit, 2-10bit, 1-12bit measurement DAC
-8-bit measurement ADC with 6 multiplexed inputs
10-bit AOC-loop control ADC and DAC
(DSP peripheral)
A UART with auto baud detection
Universal serial bus (USB) interface module
Serial Audio Port interface
Key features of the CCAP IC:
CCAP IC uses Buck converter mode with no 5V supply
-8 bit parallel interface from Wally
-Buck and Boost converters
-8-Linear voltage regulators
-2-Hi end linear regulators w/ common
reference (PA Drain regulators)
-External B+ clamp regulator
-3 Microphone Amplifiers
-Differential audio interfaces to and from
Wally
-Audio Amps,Multiplexers and Speaker &
Alert Drivers
-Headset and Send/End key detection
-Battery charger
-6 input 8 bit ADC
-Real time clock (RTC) with coin cell
backup supply and coin cell charger
-Timer circuits
-CE bus interface
-Vibrator and Backlight regulator inside the
CCAP IC
The external memory consists of 32 Mega bit 1.8V FLASH and
4 Mega bit 1.8V SRAM
The butt plug is a 17 pin CE bus connector , which supports
the USB and RS232 Serial communications. CE bus runs at
1.8V.
V.120c Supports a complete line of accessories including FM
stereo. FM Radio headset (SYN8609) plugs into the CE bus
connector.
V.120c will not support the 3WB or PST mode of
communications.
Keypad connector is a 14 pin data no mating
Product Description

V.120c
© 2001 Motorola, Inc. 6
connector-keypad, compression type
32 Khzcrystal controlled by CCAP IC for RTC and slotted
mode operation.
The charging circuit consists of Fast charger which is similar to
StarTac , V.120c phones will also support Mid Rate charger
The flex connector interfaces the main board with the Display,
Speaker and the RTC Battery in the flip.
The accessory antenna port is present on the back side of the
phone near the antenna.
All the logic parts and IC’s are placed on one side and all RF
parts and IC’s are placed on another side of the PCB
V.120c RF CIRCUIT
The RF circuit is somewhat similar to Dual band Caliber/Shark
product, the V.120c phone contains FE IC (the front end IC)
The receiver contains two complete receiver paths : 800 Mhz
path that is used by 800 Mhz analog and 800 Mhz CDMA
signals, and a PCS band(1900Mhz) path for PCS signal. The
two paths have different RF, LO and IF frequencies.
The switching of the antenna and accessory antenna port is
mechanical, normally close circuit with antenna connector, but
when accessory RF cable is inserted in the accessory port the
switch opens the circuit with antenna and closes the circuit with
the accessory port.
For Frequencies and channel numbers look at the table in this
manual
The FE IC contains the LNA’s ,interstage filtering and Mixers,
the switching and gain of the LNA’s is controlled by the
control signals
ZIF/SYN IC extracts the broadband signal from the IF ,
demodulate the analog signal and sends it to the audio logic
side for further processing.
ZIF/SYN IC controls the Main VCO ,the second LO and the
TX offset VCO (in analog mode).
V.120c uses the single VCO module for main
LO (one for the 800 mhzband and another for PCS band) The
output is split into RX_LO and TX_LO
for both the bands.
V.120c uses the ME3 IC -the mixer exciter IC
The ME3 IC allows to control the RF output power. The ME3
IC requires two LO’s, one for PCS, and the other for the 800
Mhz band.
The IF pins (input to the ME3 IC) are the same for any band.
The control signal (TXAtt) at the AGC pins control the gain of
the ME3 IC.
There is an external interstage RF filter between the mixer and
exciter.
Balun is a component external to ME3 IC and is not a discreet
part as in V.60c
From the mixer the outputs take two different paths one for TX
PCS band and another for TX 800Mhz band.
ME3 IC has 50dBM attenuator control (input IF level= -
23dBM , max output TX level= 25dBM)
At the output of ME3 IC band filter are used , in the PCS path
two split band filters are used. V.120c uses celeritekPA HBT
and not MOSFET as in V.60c.
Two stage PA in 800 Mhz band and three stage PA in PCS
band .
In V.120c PA adjustable bias only Drain therefore the output
power can be controlled by PA_B+ DAC besides ME3 IC
(through Tx_Attn). PA gate Bias is not adjustable but fixed and
regulated at 2.95v.
Product Description

V.120c
© 2001 Motorola, Inc. 7
Theory of Operation
I. AMPS
RECEIVER
RECEIVER CIRCUITRY
The phone receives the RF signal from the Antenna or the
RF test port, the received RF signal is routed through the
Diplexer -FL11 to mono block duplex SAW filter –
FL12. The RF signal is then routed to the Front End
IC(FE IC) –U100 , which contains LNA which provides
a 10-12 dB gain to the received RF signal, and U100
provides inter stage filtering and it contains Mixer which
down converts the frequency of the signal to IF which is
109.65Mhz.
The local oscillator signal which is input to the FEIC is
978 –1004Mhz. The VCO module U680 is controlled by
the ZIF/SYN IC –U932.
The mixer output IF signal 109.65Mhz is routed through
IF filter-FL201 into the ZIF/SYN IC U932 for mixing
with the second LO ,filtering and demodulation.
RECEIVER AUDIO
DISC -signal an AMPS discriminator audio which is the
output of FM demodulator in U932 is produced by mixing
the IF signal with the second LO (which is controlled by
U932) and then filtered. The audio on DISC line goes to
WALLY IC-U1100 to be digitized. All receive audio
filtering and gain control is performed in the digital
domain within the WALLY which contains DSP, the
processed RX audio is converted back to analog and
routed to CCAP IC –U2000 on signals AUDIO_P and
AUDIO_M.
The CCAP -U2000 amplifies and route the audio
signal(receive audio) to the speaker (phone speaker,
boom speaker or external speaker). The alert tone
originates in WALLY IC and follows the same path as
receive audio except from CCAP it is routed to the
alert.
TRANSMITTER
TRANSMITTER AUDIO
Audio from the Microphone (internal, boom or
external) is routed through and amplified by CCAP –
U2000 and then travel to the WALLY IC –U1100 on
MIC1 and MICREF lines which is digitized by the
CODEC inside the WALLY and the DSP present in
WALLY performs the compression, pre-emphasis,
limiting and band pass filtering function in the digital
domain. All Amps signaling (SAT, ST, DTMF) is
also generated in the digital domain by the DSP inside
the WALLY. The digitized amps TX audio signal is
converted back to analog inside the WALLY and
Theory of Operation

V.120c
© 2001 Motorola, Inc. 8
Theory of Operation
sent on FM line to the 154.8MhzTxoffset VCO to
modulate the transmitter frequency.
TRANSMITTER CIRCUITRY
The FM signal from WALLY modulates the Tx
offset VCO signal which is external but controlled
by ZIF/SYN –U932. The TxIF modulated signal
154.8Mhz is input to the ME3 IC–U600 where it
get mixed with the 979–1004 Mhz local oscillator
signal. The Txsignal then passes through the band
pass filter FL605 into the Power Amplifier (PA) –
U430 where it is amplified and the output passes
through the isolator U550 and then through TX
band pass mono block duplex SAW filter FL12 and
through diplexer FL11 to the antenna or RF test
port.
II. CDMA CELLULAR (800Mhz) MODE OF
OPERATION
RECEIVER
RECEIVER CIRCUITRY
The phone receives the RF signal from the Antenna
or the RF test port, the received RF signal is routed
through the Diplexer -FL11 to mono block duplex
filter –FL12. The RF signal is then routed to the
Front End IC(FE IC) –U100 , which contains LNA
which provides three stage gain to the received RF
signal based on its strength, and U100 provides inter
stage filtering and it contains Mixer which down
converts the frequency of the signal to IF which is
109.8Mhz.
The FE IC is controlled by WALLY through the
following signals: FEIC_G1, FEIC_G2, and MODE.
The local oscillator signal which is input to the
FEIC is 978 –1004Mhz. The VCO module U680 is
controlled by the ZIF/SYN IC –U932.
The mixer output IF signal 109.8Mhz is routed
through IF filter-FL200 into the ZIF/SYN IC U932
for mixing with the second LO ,filtering and
demodulation.
RECEIVER AUDIO
Four outputs from U932–RXIP, RXIM,
RXQP, RXQM carries the base band signal of
the receive digital call to the WALLY, the
received QPSK data is gain controlled and
converted to digital, the 1.2288 Mb/sec Rx data
stream is then decoded by the CSP inside the
WALLY to produce a signal containing only the
desired data. The digital speech data is further
decoded by the CELP vocodera part of DSP
within WALLY and then converted back into
analog receive audio and routed to CCAP IC–
U2000 on signals AUDIO_P and AUDIO_M.
The CCAP -U2000 amplifies and route the
audio signal (receive audio) to the speaker
(phone speaker, boom speaker or external
speaker). The alert tone originates in WALLY
IC and follows the same path as receive audio
except from CCAP it is routed to the alert.
TRANSMITTER
TRANSMITTER AUDIO
Audio from the Microphone (internal, boom or
external) is routed through and amplified by
CCAP –U2000 and then travel to the WALLY
IC –U1100 on MIC1 and MICREF lines which
is digitized by the CODEC inside the WALLY
and the DSP present in WALLY processes by
CELP variable rate vocoderand then processed
by the modem (CSP) within the WALLY which
produces the 1.2288Mb/sec CDMA data
stream. This stream is then converted to analog
signals and send to ZIFSYN IC on four lines
TXIP, TXIM, TXQP, TXQM. This modulates
on the TX IF (QPSK modulation) 154.8Mhz
TX offset VCO.

V.120c
© 2001 Motorola, Inc. 9
Theory of Operation
from WALLY modulates the Txoffset VCO signal
which is external but controlled by ZIF/SYN–
U932. The TxIF modulated signal 154.8Mhz is
input to the ME3 IC –U600 where it get mixed
with the 979–1004 Mhz local oscillator signal.
The Txsignal then passes through the band pass
filter FL605 into the Power Amplifier (PA) –U430
where it is amplified and the output passes through
TX band pass mono block duplex filter FL12 and
through diplexer FL11 to the antenna or RF test
port.
III. CDMA PCS (1900Mhz) MODE OF
OPERATION
RECEIVER
RECEIVER CIRCUITRY
The phone receives the RF signal from the Antenna
or the RF test port, the received RF signal is routed
through the Diplexer -FL11 to mono block duplex
ceramic filter –FL10. The RF signal is then routed
to the Front End IC(FE IC) –U100 , which contains
LNA which provides three stage gain to the
received RF signal based on its strength, and U100
provides inter stage filtering and it contains Mixer
which down converts the frequency of the signal to
IF which is 109.8Mhz.
The FE IC is controlled by WALLY through the
following signals: FEIC_G1, FEIC_G2, and
MODE.
The local oscillator signal RX_LO_PCS is 2039-
2100Mhz. The VCO module U680 is controlled by
the ZIF/SYN IC –U932.
The mixer output IF signal 109.8Mhz is routed
through IF filter-FL200 into the ZIF/SYN IC U932
for mixing with the second LO ,filtering and
demodulation.
RECEIVER AUDIO
Four outputs from U932–RXIP, RXIM,
RXQP, RXQM carries the base band signal
of the receive digital call to the WALLY, the
received QPSK data is gain controlled and
converted to digital, the 1.2288 Mb/sec Rx
data stream is then decoded by the CSP
inside the WALLY to produce a signal
containing only the desired data. The digital
speech data is further decoded by the CELP
vocodera part of DSP within WALLY and
then converted back into analog receive
audio and routed to CCAP IC –U2000 on
signals AUDIO_P and AUDIO_M.
The CCAP -U2000 amplifies and route the
audio signal (receive audio) to the speaker
(phone speaker, boom speaker or external
speaker). The alert tone originates in
WALLY IC and follows the same path as
receive audio except from CCAP it is routed
to the alert.
TRANSMITTER
TRANSMITTER AUDIO
Audio from the Microphone (internal, boom
or external) is routed through and amplified
by CCAP –U2000 and then travel to the
WALLY IC –U1100 on MIC1 and MICREF
lines which is digitized by the CODEC
inside the WALLY and the DSP present in
WALLY processes by CELP variable rate
vocoderand then processed by the modem
(CSP) within the WALLY which produces
the 1.2288Mb/sec CDMA data stream. This
stream is then converted to analog signals
and send to ZIFSYN IC on four lines TXIP,
TXIM, TXQP, TXQM. This modulates on
the TX IF (QPSK modulation) 189.8Mhz
TX offset VCO.
TRANSMITTER CIRCUITRY
The four signals TXIP, TXIM, TXQP,
TXQM

V.120c
© 2001 Motorola, Inc. 10
Theory of Operation
TRANSMITTER CIRCUITRY
The four signals TXIP, TXIM, TXQP, TXQM from
WALLY modulates the Txoffset VCO signal which is
external but controlled by ZIF/SYN–U932. The TxIF
modulated signal 189.8Mhz is input to the ME3 IC –
U600 where it get mixed with the 2039-2100 Mhz local
oscillator signal. The Txsignal then passes through the
filter FL601 into the Power Amplifier (PA) –U900
where it is amplified and the output passes through TX
band pass mono block duplex filter FL10 and through
diplexer FL11 to the antenna or RF test port.
FREQUENCY SYNTHESIZER CIRCUITRY
The phone contains three PLL frequency synthesizers
controlled by U932.
1. The main VCO : there is only one VCO modules-
which controls the tunable 979 –1004Mhz main local
oscillator –and is ON during Cellular or 800Mhz mode.
and also controls the tunable 2039-2100Mhz main local
oscillator, which is ON during PCS or 1900Mhz mode.
2. The Txoffset VCO: there are two modes and two
frequency at which this oscillator which is internal to
U932 works, but the tank circuit is external. There are
two tank circuits one for Cellular mode (800Mhz)
which will set 309.6Mhz frequency for the oscillator to
oscillate on. Another tank circuit for PCS mode
(1900Mhz) which will set 379.6Mhz frequency for the
oscillator to oscillate on. The Txoffset frequency is
divided by 2 before being fed into the mixer for
modulation.
3. The second LO: the second local oscillator also
operates in two modes with two different frequencies:
For AMPS mode the frequency is 219.3Mhz and for
CDMA mode at cellular or 800Mhz band and PCS or
1900Mhz band the frequency is 219.8Mhz. The tank
circuit is external to the U932. The frequency is divided
by 2 before being fed into the mixer.
All the synthesizers obtain their reference
frequency from the 16.8Mhz reference
oscillator.
TRANSMIT POWER CONTROL
CIRCUITRY
The transmit signal power (the output RF power)
is controlled by the three control signals
ZIF_VCA and ME_VCA from WALLY IC and
PA_VCC from CCAP IC. The output power is
controlled at three places, ZIFSYN–U932 which
has a gain control of max 40dB and ME3 IC-
U600 which has a total gain of max 36dB and PA
has a gain of max 27-32dB.
In Amps mode the power range is +8dBM to
+28dBM. In CDMA mode the RF power range is
from –50dBM to +23dBM.
In CDMA mode the power control operates in
two mode: Open loop and Close loop. In open
loop mode (at the beginning of registering–
access probe) the power level is proportional to
the received signal level, in close loop mode the
power level is controlled by the CDMA cell based
on the received signal strength at the cell site.

V.120c
© 2001 Motorola, Inc. 11
Theory of Operation
FLASHRAM
KBC5
KBC6
DATA[15:0]
Motorola Cellular Subscriber
Confidential Proprietary
CDMA Brassboard Baseband
ADDR[21:0]
MODE
TXATTEN
R_WB
RXIM
RXIP
TXQM
TXQP
TXIM
RSSI
RFCLK
RFDATA ZIF_ENB
TXIM
TXQP
TXQM
RXIM
RXIP
RSSI
RXCTRLB
INT4_B
GPIO10/BAA_B
AUDIO_GND
RF_SLEEP
TXIPTXIP
RESET_IN_B
OSCENB
GPIO3 BAND
FM
DISC
FM
DISC
RF_DETRFDETECT
CKIH
AFC 16.8Mhz
REF_WARP
GPIO2
ME_VCAAOCCNT
BATT_GND
RESETb
WDI
EN_WE
EN_OE
EN_WE
EN_CE
INTb
RAWEXTB+
Motorola Cellular Subscriber
Confidential Proprietary
32KHZ CKIL
CS0B
XTAL1
XTAL2
OEB
PAENABLE_LO
INT0(FLIP_OPEN_B)
KEY_ROW[0:5]
KEY_COL[:4]
A2OUT MIC2MIN
32KHz
MIC2OUT
AUDIOOUTM
AUDIOOUTP
OPTION1(INT6)
TEMP_SENSE
DTRPB
CTSB_ALT
DCDPB
TXDP_ALT
USB_OE
AUDPIN
AUDFB
AUDMIN
A4OUT
HEADSET
INT1(HEADSET_DET)
SPICS3
RTCBATT
SPKROUTM
UB
LB
OSCEN_b
PA_BIAS
AFC_ANALOGSTEERING
PA_BIAS
GPIO7
RFCLK
RFDATA
THERM0
THERM1
LOCK_DETECTGP109
FEIC_G1GPIO0
ZIF_VCA
USB_VMO
EB1_b EB0_b
GPIO6
GPIO11/WAIT_B
CS3_B/BCLK
BOOTMOD
VMIC1
MIC1MIN
RXQM
RXQP
RXQM
RXQP
SPKROUTP
A3OUT
A3IN
MIC1OUT
V5(2.75)
EALOGVDD(1-2)
V2 (1.8-2.75 V)
AVDD(1-2)
CVDD
DVDD
V1b(1.8V)
ANOLGVDD(1-3)
SDVDD(1-2)
V3(2.75V)
QVCCH(1-4),
GVDD(1-3),
HVDD(1-2),
KVDD,UVDD
V1a(1.8V)
QVCC(1-5)
WALLY
GPIO1
V1B
V2
V3
V5
V6
Digital_1.8V
Analog_1.8V
Memory_Vcc
Logic_2.75v
B+
RX_2.75v
TX_2.75v
USBP
USBM
USBVMOUT
USBVPOUT
USBVMIN
USBVPIN
ADV BCLK BAA
OPTION2
GPIO8
ESD protection not shown
RESET_OUT_B RESET
V10EN
VIN9
CS2_B
DATA[7:0]
A_Db
R_Wb
CCAPCEb
USBRXD
TXDP
USBOEb
FEEDBACK
MAINBATT
MAINTEMP
DisplayDriverConnectorJ3000
ON2b
VIN8
B+
V9(VIBOUT)
V8(Led_Backlgt)
ON1b
VMIC2
SW_B+_EN
RXDP
USB_VP
RTSP
RXDP_ALT
MIC3OUT
MIC3MIN
FEIC_G2
USBPWR
PA_ENABLE
Int.
Mic.
MCI0
BATT_GND
BATT_SERIAL_DATA
CCAP & Ckts
KBC1
KBR1
V1A
Ser_LCD_A0
LCDCS1
LCD_CS
Ser_LCD_CLK
Ser_LCD_MOSI
Speaker
Phone
LOGIC_2.75v
KBR2
RESET_OUT_b
EN_OE
CS1_B EN_CS
WAIT
1
2 3 467 95
11 10
8
12 15 16
17
CSS Bus Connector J1000
NC
NO
14 13
CTSB_0WIRE
RIPB
DSRPB
KEY_ROW3
MCI1
RTSB_ALT
DATALOG
_CNTRL_b
RXATTENV10REF
MIC1
MIC_REF
MIC4OUT
MIC4REF
TXDS_ALT RXDS_ALT
GPIO4
IrDA
XCVR
LOGIC_GND
PANTHEROPTIONONLY
Alert
PAH_B+
PAL_B+
PAH_B+
PAL_B+ 32KHZ PAH_D_PHASE
32KHZ
To RF Section
LED_DR1 LED_DR0
Status
LED
1
2
3
4
BATTERY
CONTACTS
STO
Flex to Flip
To RF
Section
LCD_CS
Ser_LCD_CLK
Ser_LCD_A0
LCD_CS1
Ser_LCD_MOSI RESET_OUT_b
J2000
Keypad
Conn.
CEModuleBusConnector
INT0(SM_DET)
MISO
SPICS0
SPICS1
STDA
SCKA
SC2A
BATT_GND
869
10 11 13 12
Forfutureuseon
Panther 16
ESD protection not shown
15 7 14
PantherOptionOnly 12
SRDA
AUDIO LOGIC BLOCK DIAGRAM

V.120c
© 2001 Motorola, Inc. 12
Theory of Operation
RF SIDE BLOCK DIAGRAM

V.120c
© 2001 Motorola, Inc. 13
Disassembly
Introduction
Care must be taken during the
disassembly and reassembly of the unit
in order to avoid damaging or stressing
the housing and internal components.
Ensure that a properly grounded high
impedance conductive wrist strap is
used while
performing these procedures on
electronic units.
Recommended Tools
The following tools are recommended
for use during the disassembly and
reassembly of the phone.
-Anti-Static Mat 6680387A95
-Ground Cord 6680334B36
-Wrist Band 4280385A59
_ Plastic Prying Tool SLN7223A
_ Rear Housing Removal Tool
_ Dental Pick
_ Tweezers
-T6 Torque Screw Driver
CAUTION
Many of the integrated circuit devices
used in this equipment are vulnerable to
damage from static charges. An anti-
static wrist band, connected to an anti-
static (conductive) work surface, must be
worn during all phases of disassembly,
repair, and reassembly.
Disassembly Procedure
Refer to the disassembly instructions and
photo sequence on the following pages.
Assembly Procedure
Once the unit is disassembled and the
repair
is carried out it then becomes obvious
that to
assemble the unit, the procedure is the
reverse of that previously completed for
disassembly.
Disassembly

V.120c
© 2001 Motorola, Inc. 14
Disassembly
Rear Housing Removal:
Using a generic screw driver unscrew all the 6
screws. Gently remove the Rear Housing as
shown.
Board Removal:
The six screw bosses hold the board in place.
Remove the board as shown.
Board Removal

V.120c
© 2001 Motorola, Inc. 15
Disassembly
Display Removal:
The electrometric on the display makes contact
with the power contacts on the PCB. There are
two locating pins on the display are aligned and
the four holding tabs are grabbing the board.
Make sure you release the tabs and gently lift the
display. Once you free the tabs on one side, the
other side comes off easily.
Keypad Removal:
Remove the keypad from the front housing as
shown.
Speaker Removal:
There is a adhesive backing to the speaker,
hence make sure you pry the speaker open by
the help of a bezel stick.
Holes For
Display
Locating
Pins
Pads On
The PCB

V.120c
© 2001 Motorola, Inc. 16
Disassembly
Acoustic Gasket, Power Button, VR Button<
Volume Buttons and Display Gasket Button
Removal:
All of the above accessories are placed in their
respective places and are easily removable.
Contacts
Cutouts
Mylar Place On The Board
Mylar located in Between The Pins
Mylar installing tool

V.120c
© 2001 Motorola, Inc. 17
Troubleshooting
C503 Offset VCO, sniff to avoid loading, cell=309.6, PCS=379.6
TP703 TXIP
TP705 TXQM
TP706 TXQP
TP708 LOCKDETECT
TP1129 AFC_ANALOGSTEERING

V.120c
© 2001 Motorola, Inc. 18
C503 Offset VCO, sniff to avoid loading, cell=309.6, PCS=379.6
TP703 TXIP
TP705 TXQM
TP706 TXQP
TP708 LOCKDETECT
TP1129 AFC_ANALOGSTEERING
Troubleshooting

V.120c
© 2001 Motorola, Inc. 19
Troubleshooting
Q100 BAND
R725 ZIF_VCA (analog signal)
TP701 RSSI receiver signal strength (analog signal)
TP704 TXIM
TP710 RF_CLOCK

V.120c
© 2001 Motorola, Inc. 20
C204 RX IF to ZIFSYN, level is approx equal to input level
C303 2nd LO, 219 MHz
C308 16.8 MHz oscillator output
TP702 MTESTP
Troubleshooting