BENDIX/KING
KX 165A
Page 5-46
15610M00.RCD
Rev 0, Jun/2000
TABLE 5.5 KX 155A Mainboard Voltage Measurements
POINT
VDC
TEST CONDITIONS*
SHT
DESCRIPTION
U10 pin 6
5.0
Rx, Normal Operation
1
5 V Reference
U34 pin 1
3.0
Rx, Normal Operation
1
Temperature
CR101 cathode
8.2
Rx or Tx, Normal Operation
3
Mic Compressor Supply
Voltage
CR62 anode/
C270
2.5 to 6 typ
Tx with normal microphone input
signal
3
Mic Compressor Control
Voltage
J11 pin 14
0.8 typ
Display bright
4
Photocell voltage
J11 pin 14
3.8 typ
Display dim
4
Photocell voltage
U16 pin 18
2.0 typ
Display bright
4
Display intensity
U16 pin 18
0.8 typ
Display dim
4
Display intensity
Q29 gate
0.0
Rx, Normal Operation
6
Power-up mute
Q43 drain
27 typ
Audio Amp Power
6
Audio Amp power
J1 pin 13
7.9
No Com Input Signal, Volume
knob in (squelched)
7
Squelch Input
J1 pin 13
0.7
Valid Com Input Signal or Volume
knob out (unsquelched)
7
Squelch Input
Q18 Col
9.3
No Com Input Signal, Volume
knob in (squelched)
8
Squelch gate drive
Q18 Col
0.0
Valid Com Input Signal or Volume
knob out (unsquelched)
8
Squelch gate drive
Q25 col
9.2
Rx, Normal Operation
8
Tx Sidetone Mute drive
Q25 col
0.0
Tx, Normal Operation
8
Tx Sidetone Mute drive
Q13 Gate
9.2
IDENT knob In
10
IDENT Filter Switch
Q13 Gate
0.8
IDENT knob Out
10
IDENT Filter Switch
U4 pin 1
4.0
Rx, Normal Operation
10
4 V Reference
U4 pin 6
2.5
Rx, Normal Operation
10
2.5 V Reference
CR42 Cathode
28 typ
Rx, Normal Operation
11
Aircraft Power
CR48 Anode
-220.0
Rx, Normal Operation
11
Unregulated Display Volt-
age
R219
-185.0
Rx, Normal Operation
11
Regulated display Voltage
R220
-14.4 typ
Rx, Normal Operation
11
-12V line
R287
5.4
Rx, Normal Operation
11
5V Line
R288
9.4
Rx, Normal Operation
11
9V Line
U36 pin 14
8.6
Rx, Normal Operation
11
PS Switching IC Power
*Note: Unless otherwise noted, a receiver input signal or transmitter modulation is not required for these
measurements. All voltages are referenced to chassis ground.
Summary of Contents for Bendix/King KX 165A
Page 8: ...BENDIX KING KX 165A Page vi 15610M00 RCD Rev 0 Jun 2000 THIS PAGE RESERVED ...
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Page 20: ...BENDIX KING KX 165A Rev 0 Jun 2000 15610M00 RCD Page 4 15 Figure 4 4 VOR Signal Generation ...
Page 23: ...BENDIX KING KX 165A Page 4 18 15610M00 RCD Rev 0 Jun 2000 Figure 4 6 Glideslope ...
Page 26: ...BENDIX KING KX 165A Page 4 22 15610M00 RCD Rev 0 Jun 2000 Figure 4 8 CPU Block Diagram ...
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