T2004 Multi-Control Head System Manual Part B T2004 Control Heads 57
© Tait Electronics Ltd May 2004
7 Testing the X2H2xx control heads
Test equipment
■ T2020 or T2040 radio with power supply in known working order.
■ X2AM01 radio interface board in known working order.
■ Microphone, speaker and power supply for control head.
■ 8 way micromatch loom to connect X2AM01 to radio.
■ 8 way micromatch loom to connect primary head under test.
■ Radio communications test set.
■ Multimeter.
■ 20MHz oscilloscope, preferably digital storage.
■ Standard tools, screwdrivers, etc.
Setting up
1. If T2004 control head under test is not configured as a primary head,
temporarily fit shorting link to position JP2.
2. Connect SK1 of the X2AM01 board to connector S9 of radio logic
board.
3. Connect SK3 of the X2AM01 board to connector J5 of the control
head under test.
4. Connect power and microphone to the primary control head as usual.
5. Connect the radio's antenna jack to the RF input/output of the
communication test set.
6. Connect a suitable 13.8VDC 10A power supply to the radio.
Test i ng
Power
■ Check there is always +13.8V on U22 pin 8 and U1 pin 14.
■ Check U22 pin 3 is high when the control head switch (volume control)
is off, and around 0V when the control head is switched on.
■ Check there is 5V on U22 pin 1 when control head is on.
■ Check 1/2 VCC rail on C57 is around 2-3V.
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