Motorola 880, Руководство по обслуживанию

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GSM_RX275______ and if the *GSM_DCS______ is high to switch the output of Q412 Pin6 and Q205 Pin4 to high.
# press 2 sec. Enter Manual Test Mode with Test Card
01 # Exit Manual Test Mode
07 # Mute Rx Audio Path
08 # Unmute Rx Audio Path
09 # Mute Tx Audio Path
10 # Unmute Tx Audio Path
11 xxxx # Program Main Local Osc. to Channel
12 xx # Set Tx Power level to fixed valure
19 # Display SW Version Number of Call Processor
20 # Display SW Version Number of Modem
22 # Display SW Version Number of Speech Coder
25 # Set Continuous AGC
26xxxx # Set Continuous AFC
31x # Initiate Pseudo-Random Sequence with Midamble
33xxxx # Synchronize to BCH Carrier
36 # Initiate Acoustic Loopback
37 # Stop Test
45xxxx # Serving Cell Power Level
46 # Display Current Valure od AFC DAC
47x # Set Audio Volume
58 / xxxxxx # Display / Modify Security Code
59 / xxx # Display / Modify Lock Code
60 # Display IMEI
7100 # Display Error Code
Part
Designator
Part
Description
Part
Number
Part
Designator
Part
Description
Part
Number
A1, A2 Antenna Conn. 3909014B03 U520 Modem IC 5199281C03
CR202 Main VCO Varactor 4809641F02 VR352 TX VCO Varactor 4809877C07
CR203 Main VCO Pin Diode 4809948D05 VR353 TX VCO Varactor 4809877C06
CR220 RX Local Osc. Varactor 4809641F02 SH1 Shield Low Noise Ampl. 2609315M01
CR221 Ref. Osc. Varactor 4809641F04 SH2 Shield RX Mixer 2609306L01
CR223 TX Local Osc. Pin Diode 4809948D05 SH3 Shield Saw Filter 2609282J01
CR261 TX Local Osc. Varactor 4809641F02 SH4 Shield Main VCO 2609281J01
CR330 TX Isolation Diode 4809948D05 SH5 Shield GIFSYN 2609446K01
Q221 / Q222 Supply Transistor 4809579E18 SH6 Shield TIC IC 2609307L01
Q330 Tx Predriver (Exciter) 4809527E19 SH7 Shield Ant. Switch 2609279J01
Q410 GSM Receive Power Ampl. 4809527E20 SH8 Shied Tx VCO 2609462R01
Q430 DCS Receive Power Ampl. 4809605E06 SH9 Shield PA 2609280J01
Q460 RX Mixer Amplifier 4809527E20 SH10 Shiel Front End 2609315M01
Q480 IF Isolation Amplifier 4809940E01
Q604 Transistor Thermistor Line 4813823A07
U102 Antenna Switch 5109572E04
U104 Antenna Switch Control 5109923D14
U220 GIFSYN IC 5109632D92
U300 PA 5109908K18
U340 PAC IC 5109632D08
U370 TIC IC 5109632D94 Y201 Ref Clock Varactor 4809612J19
SW_RF
from and to
5
2
3
6
4
7
ANT
U401
U102
SWITCH
CONTROL
V1
V2
V1 V2
2
3
8
Q330
Q3 62
CR330
1
4
2 ,12
7
9,10
14
8
C
DM_CS
R275
U370 / TIC
PHASE
DET.
4
720 MHz
R475
S
A
T
_
D
E
T
D
E
T
_
S
W
T
X
_
K
E
Y
A
O
C
_
D
R
IV
E
DET
TX_EN
8
12 11 10
7
1, 3
2
4, 14
RF_IN
SAT.
R
X
_
E
N
T
X
_
E
N
-1
0
V
R
X
2
7
5
1 4 5
6
EXT ANT
B C
Q430
B
C
215 MHz
Q480
B C
CR 202
C214
31
26
23
E
C
MIX_275
SW_VCC 33
Q221
S
U
P
E
R
F
IL
T
E
R
B+
E
E
17
18
B
B
13
RX275
12
19
MDM_ANA_VCC
C
S
W
IT
C
H
DEMODULATION
RXI
RXQ
IQ REF
46
47
48
C
C
43
41
42
TX
LOCAL
OSCILLATOR
MODULATION
6
7
10
TXI_P
TXQ_P
TXI_M
TXQ_M
61
62
63
64
PLL
21
PLL
PLL
Y201
57 AFC
59
CLK_OUT
SPI SERIAL
INTERFACE
DATA BUS
RF_SPI
RF_SCK
52
53
GIFSYN
U220
U340 / PAC
TX VCO
MAIN VCO
RF_START
11, 22, 44 R475V
ATT.
25dB
CHARGE
PUMP
LOOP FILTER
Q222
FL460
430 MHz
RX
LOCAL
OSCILLATOR
CR 220
Osc.
circuty
discrete
GSM 340 MHz
CR 261
Osc.
circuty
discrete
CR221
U104
DUAL BAND 8900 RF BLOCK DIAGRAM RF BOARD SIGNALS
FREQUENCIES GSM / DCS
Europe Middle East & Africa Customer Services 30.04.98
LEVEL 3 COLOUR DIAGRAMS Rev. 1.0
Dual band 8900
Colin Jack, Michael Hansen, Billy Jenkins Page 2 of 2
REVISIONS
RF LAYER - ORDERABLE SPARES
TEST MODE: Type in Key commands: 110062#, 262000#, 25013#, 241#. Test for a set level eg. (-30dB’s) at point ______to compensate cable losses.
The only real short-cut we can take is by probing the 215MHz test point_______ (pin 31of GIF).
- If the 215 Mhz is low probe the R.F inputs to the Mixer to see which RF path (RF INPUT or MAIN VCO) the fault lies on.
- If Main VCO is low , the main suspicions are with the main VCO, or the VCO filter (FL461/462) and the SH01 and SH02 can should be removed.
. If the input to the filter is low, then there is some discretes under the VCO can. Check SF_VCC U220 Pin21 and Main VCO tuning voltage U220 Pin23.
- If RF INPUT, and the MAIN VCO OK, the main suspicions are with the 2 input filters FL400 and FL401 and the can SH10 should be removed.
- If 947.4 and 794.4 RF values are fine but 215MHz into GIF is low _____ then we must also remove can SH03 and SH5. The SAW filter (FL480)
and IF Isolation AMP (Q480) is located under here.
Put the phone into test mode and key in the commands: 110062#, 1200#, 310#
Firstly if no Transmiter output we should check the modulation output at U220 Pin 4 and the Main VCO
- If the modulation output is missing and Main VCO is fine then remove SH05 and check in the TX Local Oscillator
the CR261 and the tuning voltage from U220 Pin10. Check if Q222 and Q221 have both 2.7V.
-
- If Main VCO is missing but modulation is fine remove SH05 and check discretes, SF_VCC U220 Pin21 and
- If bothMain VCO and modulation are missing then check the collectors of Q221 and Q222 for 2.7V. If ok, then
check from CPU DM_CS at Modem Pin9. Possible GIF SYN or Modem problem.
- If TX is generated but is low then we look for problems under SH08 and SH09 and follow path through to antenna.
- If TX looks OK but fails in wingate check at the T/R switching circuitry (U102/U104) switching RF to J600 Pin2
If still no problems found, measure from CPU DM_CS at Modem Pin9. If ok replace U220.
- If the 215 is OK then we can assume problem lies around GIF, either 430MHz Local Oscillator or in generation of RXI and RXQ. The can
SH05 should then be removed. Check that IQ Ref from the SMOC is around 1.38Vdc and then the RXI and Q outputs from the GIF to check w hich is
Before actually removing any cans it may be worth checking the RX275_____, MDM_ANA_VCC______, RX_EN______, -10V ______,
RECEIVE DEBUG - GSM MODE
TRANSMIT DEBUG
Motorola Confidential Proprietary
VRef 16
Tx SIGNALS - 110062#, 1215#, 310#
Frequency 217Hz - 1ms/cm
SAT_DET
3Vpp
Power Step:
15 - 280mVpp
04 - 520mVpp
AOC
TX_KEY
2,75Vpp
Power Step:
12-15 - 900mVpp
04-11 - 50mVpp
DET_SW
3Vpp TX_EN
DM_CS
2,8Vpp
TXI
2.1Vpp
2.1Vpp
TXQ
Modem Callprocessor Interface
MDM_RD
MDM_WR
2,8Vpp
500us/cm
2,8Vpp
500us/cm
Rx SIGNALS - 110062#, 262000#, 25013#, 241#
Frequency 217Hz - 1ms/cm
RX_ACQ
2,8Vpp
RF_START
20us/cm
2,8Vpp
500us/cm
1.8Vpp
500us/cm
RXI
1.8Vpp
500us/cm RXQ
1.38Vrms
500us/cm
IQ_REF
Rx SIGNALS - In Standby Mode
Signal from PAC to SMOC.
When PA is at or near saturation signal is low, telling SMOC to reduce AOC drive
When the PA is not near saturation this is high, telling SMOC to increase AOC drive.
Signal from the SMOC to the PAC
When this signal is low, the internal gain in the PAC is unity.
When this signal is high, the internal gain in the PAC is 1.
From uP to PAC.
This is a timing signal to the PAC to provide the current path for the initial loop precharge
Signal from SMOC to PAC.
This is a linear control voltage for ramp up and ramp down of the PA output level.
This controls the voltage on the exciter control output (EXC) from the PAC.
EXC
Signal from uP but inverted via Q500 and used to time:-
1. GIF SYN
2. TIC 3. Tx VCO 4. PAC 5. RF Switch
Enables Tx Path when high
Signal from uP inverted via Q504.
Enables TIC, PA and TX VCO.
When high, this enables Tx path.
From SMOC IC to GIF SYN
This signal is the in-phase input to the I-Q Modulator of the GIF SYN.
From SMOC IC to GIF SYN
This signal is the quadrature input to the I-Q Modulator of the GIF SYN.
From uP to SMOC.
This signal indicates when the uP is reading data from the SMOC. High when enabled.
From uP to SMOC.
This signal indicates when the uP is writing data to the SMOC. High when enabled.
From uP to SMOC
This is an interrupt from the uP to the SMOC. When high this indicates to the SMOC the
beginning of the receive burst.
From uP to GIF SYN
Signal to drive the GIFSYN IC. This is a pulsed signal which controls the sending of SPI data
to the GIFSYN for all RF functions.
From GIF Syn to SMOC IC.
This is a baseband analogue signal to A/D convertors of SMOC
From GIF Syn to SMOC IC.
This is a baseband analogue signal to A/D convertors of SMOC
From SMOC to GIF Syn.
This is a DC level from SMOC for the RXI and Q signals to ride on.
TEST COMMANDS
Q410
B
C
FL462
FL461
FL401
FL400
CR203
Q201
C213
C212
Q202
Q200
DCS
DCS ( CH 700 )
1627,8 MHz
GSM ( CH 62)
732,4 MHz
SF_VCC
*GSM_DCS
GSM ( CH 62 ) DCS ( CH 700 )
813,9 MHz
B B
C C
C
C
VR352, 353
Q350
B
C
R475
U300
Q303-
Q305
-10V
PA
GSM_*DCS
CR223
C271
DCS 240 MHz
GSM 170 MHz
DCS 120 MHz
to SMOCand 13 MHZ Clock
GSM ( CH 62 )
902,4 MHz
DCS ( CH 700 )
GSM ( CH 62 )
947,4 MHz
DCS ( CH 700 )
1842,8 MHz
51
Q460
1747,8 MHz
GSM ----- 1V
DCS 1,7 - 2V
GSM 1,5V - 2,5V
DCS 1,5V - 3,0V
GSM / DCS 1,2V
GSM / DCS
DCS 1,8 - 2,1V
GSM -5dB
R333
Attenuator
DCS -5dB
GSM 8,7dB
DCS 12dB GSM 21dB
DCS 17dB
GSM -0,6dB
DCS -1,0dB
GSM -2,2dB
DCS -2,2dB
GSM -2,2dB
DCS -2,2dB GSM 12,8dB
DCS 9,3dB
GSM 9,8dB
DCS 9,8dB
GSM -4,5dB
DCS -4,5dB
GSM 10dB
DCS 10dB
J400 Pin16
faulty.
a
b
e
a
b
c d a
e c
g
k
If the signal is low at the input to these, it could be losses caused by the Antenna Switch U102.
h
at point _________ to establish which of the signals are missing or if both the signals are missing.
i
Main VCO tuning voltage U220 Pin23.
and the J600 connector itself.
Loss from
Antenna and EXT ANT
GSM -1.7dB
DCS -2.1dB
GSM / CHANNEL Tx Rx MAIN VCO Rx I.F Rx IF LO Tx I.F Tx IF LO
1-Low 890.2 935.2 720.2 215 430 170 340
62-Middle 902.4 947.4 732.4 215 430 170 340
124-High 914.8 959.8 744.8 215 430 170 340
DCS / CHANNEL Tx Rx MAIN VCO Rx I.F Rx IF LO Tx I.F Tx IF LO
512-Low 1710 1805 1590 215 430 120 240
700-Middle 1747,8 1842,8 1627,8 215 430 120 240
885-High 1785 1880 1665 215 430 120 240
ANT
A1
A2
GSM_RX275
DCS_RX275
from GSM /DCS Matrix
RXI
IQ_REF
RXQ
15
16
14
78
77
23
24
22
21 TXQ_P
TXQ_M
TXI_P
TXI_M
RF_SCK
RF_SPI
42
73
69
17
2, 5,10,18
25, 41, 45
53, 64, 70
6
79
8
4
13_DCLK_B
from U703, 37
RESET
TX_KEY
from U701, 6
RX_ACQ
L 275V
SPI_MI
SPI_RFCS
SPI_SCK
SPI_MO
A
O
C
_
O
U
T
3
3
S
A
T
_
D
E
T
6
7
D
E
T
_
S
W
6
6
MODEM
U520
9
DM_CS
75
76
MDM_RD
MDM_WR
to BIC pin17
RX275
34
SAT_DET
DET_SW
AOC_DRIVE
GSM
DCS
Capacity Switch
CR350 / 351
TX_GSM_*DCS
7 11
B
C
PAC_EN
VR352
f
g
h
i
k j
j