M850-00
T856/857 Initial Tuning & Adjustment
C3.1
Copyright TEL 31/09/98
3 T856/857 Initial Tuning & Adjustment
Caution:
This equipment contains CMOS devices which are susceptible to dam-
age from static charges. Refer to Section 1.2 in Part A for more infor-
mation on anti-static procedures when handling these devices.
The following section describes both short and full tuning and adjustment procedures
and provides information on:
• channel programming
• selecting required audio links
• synthesiser alignment
• PA alignment (T856 only)
• modulator adjustment
• limiter adjustment
• setting line level
• compressor adjustment
• timer adjustment.
Note:
Unless otherwise specified, the term "PGM800Win" used in this and follow-
ing sections refers to version 2.00 and later of the software.
Refer to Figure 4.4 and Figure 4.4 which show the location of the main tuning and
adjustment controls. Refer also to Section 6 where the parts lists, grid reference index
and diagrams will provide detailed information on identifying and locating compo-
nents and test points on the main PCB. The parts list and diagrams for the VCO PCB are
in Part E.
Section Title Page
3.1 Introduction 3.3
3.2 Channel Programming 3.3
3.3 Test Equipment Required 3.4
3.4
3.4.1
3.4.2
3.4.3
3.4.4
3.4.5
3.4.6
3.4.7
Short Tuning Procedure
Introduction
Synthesiser Alignment
Output Power Adjustment (T856 Only)
Two Point Modulation Adjustment
FM Deviation (Limiter) Adjustment
Line-in Level Adjustment
CTCSS Encoder
3.5
3.5
3.5
3.5
3.6
3.6
3.7
3.7
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