Specifications

SG-2000 MANUAL 124

The SGC Building, 13737 S.E. 26th St. Bellevue, WA. 98005 USA

21.0 TECHNICAL REFERENCE

The following chapter is intended for more advanced users who would like a

better technical understanding of the complexities of the SG-2000 radio.

21.1 Squelch Scale Recalibration

The following procedure recalibrates the squelch level on the SG-2000:

1. Press: Shift/Func , 3 - Squelch Level - , 0 Allow to time out.

2. Press: Shift/Func , 3 - Squelch Level - , 9 Allow to time out.

This process recalibrates the squelch scale.

3. Press: Shift/Func , 3 - Squelch Level - , 2

This sets the squelch level to "2".

4. Activate or disarm squelch when operating by pressing: 3 - SQL

21.2 SG-2000 MicroProcessor Reset Procedure

SGC recommends that the following procedure not be undertaken by inexper-

ienced operators. This procedure involves identifying specific pins on integrated

circuit chips. If you are not comfortable working at this level of detail on your

SG-2000, please do not proceed. Return the radio to SGC or your SGC dealer for

service.

To RESET the MicroProcessor in your SG-2000, follow the instructions below:

1. Turn off radio.

2. Remove Top Cover.

3. Remove MicroProcessor shield located at the right rear of exciter board

when facing the radio. Refer to drawing (J40100930-B) in schematics and

parts layout portion of this manual which follows the technical section.

Identify clock chip IC-7 and pins 18 and 22 as shown in the following

diagram: