Motorola StarTAC130 Service Manual page 39

Supplement 8
PCB only
No rx
START
Remenber to check ANT. SW. components for bad positoined or
missing:
CR432 diode pin, R1128, C1043
Poor RX= reduce the battery stand by
Does the
BER,
RX_Quality
-Level fail on
CH1-62-124?
yes
Is the IF
signal
215MHz
-8dBm ok at
L401 terminal
(see page 36)
yes
Are the
signals ok
RXI,RXQ at
U201 pin
46,48
yes
5
03/05/1999
GSM Krunch - Level 3 Procedure vers.1.1
1) Innject into ext.antenna port of the PCB a 947.4MHz signal at -20dBm
2) With the PCB in test mode press the following keys sequence 45062#
3) Use the PCB TEST to comparison
ATTENTION :
4)
differents PROBES and CABLES.
no
Attention:
The root cause could be the strong interferencies
due to the closeness to the BS (base station) .
no
no
U201pin 47
yes
Is the signal
L.O.430MHz
(see page 36)
yes
Check bias Q203,Q202, GIFSYN
U201 and NOTE 1.
- MOTOROLA CONFIDENTIAL PROPRIETARY -
The mesaures of the signal can be change with
A
Go to
page11
Is the
signal
IQREF
1.38V at
ok at
at U201 pin
40
no
Check U500 pin 21 and
NOTE 1
Check U201(pin
no
43=2.25V)
CR431.L433 and
NOTE 1.
no
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