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44
68P09403A50
12/9/97
Dual Band 880/890 (DCS/GSM)
Proceed to “#5 NPU Repair Procedure” on page 48.
NO
NO
YES
YES
YES
NO
NO
YES
Proceed to “#7 NPU Repair Procedure” on page 48.
Proceed to “#8 NPU Repair Procedure” on page 49.
Proceed to “#6 NPU Repair Procedure” on page 48.
1
Is +2.75V present
at U701 pins 45,
46, 58, and 59?
Does U900 pin 30
reset line go high?
Remove any short on the
watchdog pull up
pads R904.
Does U900 pin
31 watchdog line
go high?
Tie the watchdog line
high by shorting the
watchdog pull up
pads R904.
2
Is CE signalling
present at U704 and
705 at pins 26 and
27 respectively?
Summary of Contents for 880
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