Initial Checks - Tait TM8235 Service Manual

9.1

Initial Checks

Types of checks
Symptoms of Fault
Table 9.2 Format of error displays by different control heads
Control head
1-digit-display control head
2-digit-display control head
3-digit-display control head
Graphical-display control head
Frequency Bands
180 Frequency Synthesizer Fault Finding
There are two different types of initial checks, which are covered in the
following tasks:
Task 1: calibration checks
Task 2: lock status.
Which, if any, of these tasks needs to be carried out depends on the
symptoms of the fault.
The symptoms of the fault may be divided into three categories:
radio fails to power up and system error is displayed
lock error is displayed
radio is in lock but exhibits transmit or receive fault.
The nature of the display depends on the type of control head as shown in
Table 9.2.
In the first two cases the checks of
required. In the last case there are several symptoms; these are listed below.
Where test procedures or figures differ according to the frequency band of
the radio, the frequency band is given in brackets. The frequency band may
be referred to as either 'VHF' (very high frequency) or 'UHF' (ultra high
frequency) or identified by the frequency sub-band, such as 'B1' or 'H7'.
The product-code label on the radio body will identify the frequency band
as described in "Product Codes" on page
bands is given in "Defining Frequency Bands" on page
Type of error
Lock error
L
OL
OL
Out of lock
Task 1 and
17. A definition of frequency
System error
E
E2
E2
System error
Task 2 respectively are
126.
TM8100/TM8200 Service Manual
© Tait Electronics Limited June 2006