Motorola SSETM 5000 service manual Channel Select Error, RTA3 RTA2 RTA1 RTA0

9-12 Troubleshooting Charts: Channel Select Error

9.7Channel Select Error

Channel

Select Error

Verify operation of channel knob using Button Test flowchart

By studying the

adjacent table against the channel numbers that have errors, one signal may be determined to be in error. Verify logic levels at R235, R236, R239, and R241 for each channel.

Signals

check good at U1 Yes on the controls

flex assy.?

No

Replace

Housing

Assembly

	Channel		RTA3		RTA2		RTA1		RTA0
Probe Point		(R241)		(R239)		(R236)		(R235)
	1		1		1		1		1
2		1		1		1		0
3		1		1		0		1
4		1		1		0		0
5		1		0		1		1
6		1		0		1		0
7		1		0		0		1
8		1		0		0		0
9		0		1		1		1
10		0		1		1		0
11		0		1		0		1
12		0		1		0		0
13		0		0		1		1
14		0		0		1		0
15		0		0		0		1
16		0		0		0		0

Verify codeplug

programming with RSS. If codeplug checks OK, then

replace U1.

MAEPF-27402-A

November 11, 2004 6881094C12-A