Motorola SSETM 5000 service manual Measure RF levels at C723

9-26 Troubleshooting Charts: TX RF

TX RF—Page 2

1

Measure RF levels at C723

&C721 (AC coupled). Calculate loss thru antenna/remote switch and antenna harmonic filter.

Check/fix

No antenna/remote

Loss < 2 dB? switch and antenna harmonic filter.

Yes

Check antenna launch J101 & radio assembly.

2

Measure

RAWB+ voltage

at U102-6

RAWB+		No					Check
about						continuity to
7.2 Vdc?						J1-1 thru E1.
	Yes
Measure
TXB+ at
U102-14
TXB+							Check
		No				continuity to
about
					J1-1 thru Q1,
7.2 Vdc?
						F901 & E4.
	Yes
Measure
Vgate at TP111,
normally 4 to
5.5 Vdc
		No
Vgate				4
> 4 Vdc?
	Yes
All parts
			No				Solder and
around U102 & U104
							recheck
soldered?

Driver has low gain. Replace U102.

MAEPF-27420-B

November 11, 2004 6881094C12-A