8-1
Revised January 1995
Part No. 001-9750-003
ALIGNMENT PROCEDURE AND PERFORMANCE TESTS
8.1 GENERAL
8.1.1 INTRODUCTION
The following alignment should be performed if
repairs are made that could affect the factory align-
ment. Performance tests are located in Sections 8.5
and 8.6, and it is recommended that these tests be run
on transceivers before they are placed in service.
To perform this alignment, the test mode
described in Section 3.11 must be selected. This mode
configures the transceiver as required to perform the
various adjustments. A special test mode is required
because the transceiver does not unsquelch or key up
in the LTR mode until the proper data handshake
occurs.
The test mode is selected by turning power on
with the RxD and TxD lines of the microphone
connector shorted together (P2, pins 10 and 13). When
the test mode is selected, “RX-TX-RSSI” (the first test
function) is displayed continuously. The Bank 0 test
channels should be used for this alignment. See
Section 3.11.2 for more information.
8.1.2 TEST CABLES
CAUTION
Applying a positive DC voltage to either audio ampli-
fier output (even momentaril
y)
will seriously damage
the device. Momentarily grounding an output should
not result in damage.
Two test cables are required to perform trans-
ceiver alignment. One cable connects to the accessory
pigtail and the other connects to the microphone jack.
These cables are shown in Figure 8-1.
For transceiver power to turn on, the ignition
sense input of the accessory pigtail (J100, pin 6) must
be connected to 13.8 volts. To perform receiver align-
ment, a 4.0-ohm, 15-watt speaker load must be
connected to the external speaker outputs of this cable
(pins 1 and 2). The microphone cable is required to
select the test mode, inject the transmit audio signal,
and key the transmitter.
Figure 8-1 Test Cables
NOTE: Transceivers with Version 207 or later soft-
ware have three banks of test channels. Select Bank 0
for this alignment (see Section 3.11.2).
8.2 FREQUENCY ADJUSTMENT
a. Connect the test setup shown in Figure 8-2. Select
the test mode and Ch 381 (860.5125) or Ch 240*
(938.0000) of the RX-TX-RSSI function (see
Section 3.11.2).
b. Connect a DC voltmeter to the wire-out on the
collector of Q804/Q807 on the RF board (see align-
ment points diagram in Figure 8-4).
Cable End
of Jack
SECTION 8 ALIGNMENT PROCEDURE AND PERFORMANCE TESTS
* Setting with 900 MHz models
Содержание Summit DM 975x
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Страница 189: ...Revised January 1995 Part No 001 9750 003 10 32 REMOTE CONTROL UNIT INTERFACE BOARD SCHEMATIC ...
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