SG-2000 MANUAL 124
The SGC Building, 13737 S.E. 26th St. Bellevue, WA. 98005 USA
©1995, SGC, Inc. TEL: (206) 746-6310 FAX: (206) 746-6384
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:
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