Ericsson 9D902780G3, Руководство по обслуживанию

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PRODUCTION CHANGES & IC DATA
U301
19A704971P9
+5V Regulator
U302 & U601
19A116297P7
Dual Wide Band Op-Amp
U201 and U203
19A705927P11
Silicon Bipolar MMIC
U202
344A3907P1
Silicon Bipolar MMIC
U303
19A704971P7
-5V regulator U501
344A3070P1
Operational Amplifier
PRODUCTION CHANGES
Changes in the equipment to improve or to simplify circuits are identified by a
"Revision Letter", which is stamped after the model number of the unit. The
revision stamped on the unit includes all previous revisions. Refer to the Parts
List for descriptions of parts affected by these revisions.
REV. A - TRANSMITTER SYNTHESIZER BOARD
19D902779G3,6,7
To correct loading problem on synth IC which could cause failure to lock
on channel.
R707 was 47k ohms (19B800607P473).
REV. B - TRANSMITTER SYNTHESIZER BOARD
19D902779G3, G6-G8
To make new band splits compatible with helical filters. New PWB.
C15 was 0.1
µ
F (19A700004P2).
C16 was 330 pF (19A702061P73).
LBI-38671
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