User's Manual Part 2
Table Of Contents
- Maintenance
- Introduction
- Scheduled Maintenance
- Unscheduled Maintenance
- Introduction
- Tools, Materials and Test Equipment Required
- T6T VHF Amplifier Procedures
- Top and Bottom Covers
- Removing and Refitting the Interface Module
- Removing and Refitting the PSU Regulation Module
- Removing and Refitting the Power Supply Modules
- Removing and Refitting the Combiner BIT Module
- Removing and Refitting the PA Modules
- Removing and Refitting the Front Panel PCB
- Removing and Refitting the Cooling Fans
- T6T VHF Drive Assembly Procedures
- Removing the Top Cover
- Removing and Refitting the Processor Module
- Removing and Refitting the PSU Regulation Module
- Removing and Refitting the Drive Module
- Removing the Bottom Cover
- Removing and Refitting the PA Control Module
- Removing and Refitting the Power Supply
- Removing and Refitting the Front Panel PCB
- Virtual Front Panel (VFP)
Fig 45 T6T VHF Drive Assembly Wiring and Interconnection Diagram
Microphone/Diagnostics
Front Panel assembly
CN3
CN1
Microph
one/
Front Panel
Connections Name
Characteristic
CN2-1 1 Ground - Microphone
0 V
CN2-6
2 Transmit Data
RS232
CN2-3 3 MIC PTT
CN2-4 4 Receive Data
RS232
CN2-5 5 Sidetone (Headset Drive) 3 Vac pk-pk, 200R
CN2-2
6Microphone Input
CN2-7 7 Ground
0 V
CN4
CN5
Power
Supply
Regulation
CN2
1
2
2
3
1
CN3
1
3
2
CN1
4
dc Input
CN2-2
Fused 21.6 to 32 V
dc Input
Input-2
CN2-1
Ground Supply
0 V
Connections
DC Input
Regulation
Name
Character istic
Input-3 n/c
Micr ophone/
Diagnostics
L
N
E
ac Input
CN1-1
CN1-6
CN1-5
Regulation
CN1-3
CN1-2
CN1-1
PSU
Connections
Ground Supply
Name Characteristic
CN1-4
0 V
CN3 CN4
CN7
Facilities
CN5
MARC
CN6
50
CN6
CN5
CN1
Processor module
PA Control
module
Connections
CN12-1
Processor
Characteristic
Name
Front Panel
Processor
Connections Name Characteristic
CN4-1
CN4-2
CN4-3
CN4-4
CN1-1
CN1-2
CN1-3
CN1-4
LED Alarm
LED Ready
LED Standby
LED Tx
LCD RS
Open collector (5 mA)
CN4-5
CN4-6
CN4-7
CN4-8
CN4-9
CN4-10
CN4-11
CN4-12
CN4-13
CN4-14
CN4-16
CN4-17
CN4-18
CN1-20
CN1-19
CN4-15
CN1-25
CN4-24
CN4-23
CN1-22
CN1-21
CN1-5
CN1-24
CN1-23
CN1-16
CN4-19
CN4-22
CN4-21
CN4-20
CN1-18
CN1-17
CN1-6
CN1-7
CN4-25
LCD R/W
LCD Backlight
Transmit Data
+5 V Supply
-5 V Supply
Ground
+15 V Supply
Ground
Mic PTT
LED RX (not used)
5 V pull-up
TTL
TTL
TTL
TTL
0 V
-5 V
TTL
TTL
+15 V
LCD Enable
Data 3
Data 2
Data 7
Data 6
Data 5
Data 4
RS232
+5 V
0 V
34
CN3-14
CN3-13
CN3-12
CN3-11
CN3-10
CN4-14
CN4-13
CN4-12
CN4-11
CN4-10
n/c
Remote on/off
V Unreg
V Unreg
dc Detect
CN3-9
CN3-8
CN3-7
CN3-6
CN3-5
CN3-4
CN3-3
CN3-2
CN3-1
Connecti ons
CN4-6
CN4-9
CN4-8
CN4-7
CN4-5
CN4-4
CN4-3
CN4-2
CN4-1
Regulation
ac Detect
-15 V Supply
Ground
+5 V Supply
+15 V Supply
Proce
ssor
Name Characteristic
+15 V Supply
-15 V Supply
+5 V Supply
Ground
-15 V
21.6 to 32 V
21.6 to 32 V
Open collector
15 V on, 0 V off
+15 V
+5 V
+15 V
-15 V
+5 V
0 V
0 V
CN6-7
CN6-6
CN6-10
CN6-9
CN6-8
CN5-10
CN5-9
CN5-6
CN5-7
CN5-8
-15 V Supply
ac Detect
dc Detect
-15 V Supply
Ground
-15 V
-15 V
0 V
Connections
CN6-5
CN6-4
CN6-3
CN6-2
CN6-1
CN5-2
CN5-4
CN5-3
CN5-5
Regulation
CN5-1
Name
+5 V Supply
+15 V Supply
+5 V Supply
+15 V Supply
Ground
PA Control
Characteristic
+15 V
+5 V
+5 V
0 V
+15 V
*
*
CN6-7 7
CN6-8
CN6-9 9
8
Processor
CN6-1
CN6-2
CN6-3
CN6-5
CN6-6
CN6-4
**
4
6
5
3
1
2
MARC Port
Connections
Data RX A - Data In - RS422
RS422
RS422
Data TX B - Data Out +
Data TX A - Data Out -
RS422
0 V or +10 V to +60 V or
Fused 500mA, 21.6 to 32 V
+20 dBm to -20 dBm 600R
Characteristic
PTT Input
Data RX B - Data In +
Unregulated Supply
Line In +
Ground 0 V
Name
+20 dBm to -20 dBm 600R
**
CN5-4
CN5-6
CN5-7
CN5-5
7
5
6
4
Grounding output +/- 60V,
100 mA maximum
TTL pull-up active low
Grounding output +/- 60V,
100 mA maximum
Squelch Defeat (not used)
Antenna Change-over
External VSWR
CN5-3
CN5-2
CN5-1
Processor
Connections
Facilities
2
3
1
TTL pull-up active low
Characteristic
Name
E Bit
PTT
Ground
0 V
Ground
Unregulated Supply
CN5-8
CN5-9 9
8
0 V
Fused 300 mA 21.6 to 32 V
Groundi ng output +/- 60 V,
100 mA maximum
Reserved
Tape OutputCN5-14
CN5-15
CN5-13
CN5-12
CN5-11
14
15
13
12
11 BIT Interruptive Test
RSSI (not used)
Ready Output
Facilities
Connections
CN5-10
Processor
10 Inhibit
Open collector, 0 V=Ready
-10 dBm. 100R
TTL pull-up active low
Characteristic
***
V Unreg
Receive Data
0 V=PTT, 5 V pull-up=PTT
Turn +
TTL
TTL
TTL
RS232
Turn -
Sidetone (Headset Drive) 3 Vac pk-pk
Loudspeaker Amp Drive
Ground
Mic Input
Ground
0 V
1.6 V pk-pk maximum
0 V
2 V pk-pk maximum
Push
Ground
0 V
CN1-26CN4-26
CN1-27CN4-27
CN1-31
CN1-29
CN4-28
CN1-30
CN4-31
CN4-29
CN1-28
CN4-30
CN4-33
CN1-34
CN1-33
CN4-34
CN1-32CN4-32
Open colle ctor (200 mA)
0V=off, open collector=on
n/c
n/c
n/c
n/c
n/c
CN2
CN1
CN3
CN4
CN2
CN3-2
Front Panel
Characteristic
Ground
Connecti ons
Loudspeaker Output
Name
0 V = PTT, 5 V pull-up = not PTT
6k8 input impedance, 5 mV sensitivity
CN7
6
Drive
module
Reference Frequency
Connections
Front Panel
-20 dBm to 0 dBm
Characteristic
Name
CN5-1
Forward Power Sense
CN9
Connections
17 dBm ± 1 dB
Name
Characteristic
Drive
Name
Characteristic
CN4-1
(Rear Panel)
CN9
Open collector (5 mA)
Open collector (5 mA)
Open collector (5 mA)
Data 1
Data 0
TTL
TTL
CN1-12
CN1-13
CN1-14
CN1-15
CN1-8
CN1-9
CN1-10
CN1-11
5 V pull-up
5 V pull-up
Drive
1 dBm carrierRF DriveCN7CN3-1
Connections
Name
Characteristic
-10 V to -60 V at 6 mA
TTL pull-up active low
Name
Characteristic
CN3-1
CN3-2
CN3-3
Heatsink
CN8 V Unreg
-33 V
Ground Supply
21.6 to 32 V
0 V
n/c
10
14
3
CN3-3
n/c
n/c
CN5
CN4
Reference Frequency
(Front Panel)
CN4-1
CN8
CN10
(-30.5 dBc ± 0.9 dB)
Mains IEC
Connector
Filtered/
Fused
Frequency Trim
CN1-14
CN1-14
CN1-50
CN1-48
CN1-49
CN1-47
CN1-45
CN1-46
CN1-44
CN1-43
CN1-42
CN1-41
CN1-15
CN1-16
CN1-21
CN1-22
CN1-23
CN1-17
CN1-19
CN1-18
CN1-20
CN1-24
CN1-25
CN1-30
CN1-26
CN1-29
CN1-28
CN1-27
CN1-31
CN1-32
CN1-33
CN1-34
CN1-36
CN1-35
CN1-37
CN1-40
CN1-39
CN1-38
CN1-50
CN1-45
CN1-43
CN1-44
CN1-47
CN1-46
CN1-49
CN1-48
CN1-28
CN1-42
CN1-41
CN1-38
CN1-39
CN1-36
CN1-37
CN1-40
CN1-32
CN1-31
CN1-29
CN1-30
CN1-34
CN1-33
CN1-35
CN1-21
CN1-24
CN1-23
CN1-22
CN1-26
CN1-27
CN1-25
CN1-17
CN1-16
CN1-15
CN1-20
CN1-19
CN1-18
TTL
TTL
TTL
TTL
TTL - Low OCXO fitted
TTL - Hi gh fan on
TTL
BITControl3(not used)
BITControl2(not used)
Step Size (not used)
V/U Detect
TR Detect
Reserved
OCXO Fitted
Fan Enable
TTL
TTL
TTL
TTL
TTL
TTL
0 to 2.5 V
10 mV / °C
10 mV / °C
0 to 5 V (5 V, 3 dB back off)
TTL
TTL
TTL
TTL
TTL
BIT Loop Correct
BIT Synth Lock
BIT Open Loop
BIT VSWR OK
BIT Control 1
BIT Control 0
Reflected Power
PA Temperature
Auto Level Control
External VSWR
PAC Temperature
NB/WB (not used)
Tx Key
TTL
TTL
TTL
TTL
0 V
TTL
0 V
TTL pull up active low
TTL
TTL
TTL
TTL
Filter 3
Data
Phase Load
Clock
Synth Load
Ground
Filter 4
Filter 0
Filter 2
Filter 1
Ground
Power Down
Tx/Rx Detect
CN1-10
CN1-13
CN1-12
CN1-11
PA ControlProcessor
CN1-7
CN1-7
CN1-9
CN1-10
CN1-8
CN1-12
CN1-13
CN1-11
CN1-9
CN1-8
CN1-2
CN1-3
CN1-1
CN1-5
CN1-6
CN1-4
CN1-6
CN1-5
CN1-4
CN1-2
CN1-3
CN1-1
Connections
0 to 2.5 V
0 V
±2.5 V
±2.5 V
0 to 2.5 V
0 to 2.5 V
0 to 2.5 V
0 V
0 V
0 V
0 V
0 V
0 V
Ground
Ground
Q
Ground
Ground
BIT Q Monitor
BIT I Moni tor
RF AGC (Not used)
I
Ground
IF AGC (Not used)
Ground
Ground
Name
Character istic
***
A B C D
CN8
Processor
CN8 Ring
CN8 Tip
External Speaker Drive
External Speaker Drive 3 Vac pk-pk maximum
Charact eri sti c
Connections Name
External Speaker
1
2
CN8 Sleeve Ground 0 V3
3 Vac pk-pk maximum
Antenna Change-over
TTL pull-up active low
Potential range 0 V to 10 V
6
7
8
2
4
3
5
Pin Number
1
Name
CN7A
n/c
n/c
n/c
RTIP
TRING
n/c
TTIP
RRING
*
6
7
8
2
4
3
5
Pin Number
1
Name
CN7B
HDLC CL B
HDLC CL A
Unregulated Supply
HDLC Rx B
HDLC Tx B
HDLC Rx A
HDLC Tx A
Ground
6
7
8
2
4
3
5
Pin Number
1
Name
CN7C
n/c
Unregulated Supply
Data Rx B (Data In +)
Data Tx B (Data Out +)
Data Rx A (Data In -)
Data Tx A (Data Out -)
Ground
*
6
7
8
2
4
3
5
Pin Number
1
Name
CN7D
Not used
Fast antenna
change-over/PTT
Not used
Line In +
PTT Input
Line In -
Not used
Ground
*
Characteristic
Characteristic
Characteristic
Characteristic
+20 dBm to -20 dBm 600R
+20 dBm to -20 dBm 600R
0 V
0 V or +10 V to +60 V or
-10 V to -60 V at 6 mA
+20 dBm to -20 dBm 600R
+20 dBm to -20 dBm 600R
ANSI T1.403-1995 (T1)
ITU-T: G.703 (E1)
ANSI T1.403-1995 (T1)
ITU-T: G.703 (E1)
NPN open collector
grounding transistor
0 V or +10 V to +60 V or
-10 V to -60 V at 6 mA
0 V
RS 422
RS 422
RS 422
RS 422
RS 422
RS 422
21.6 V to 32 V
Reserved
RF PA Bias Disable
TTL
0 V
7.5 V pk-pk maximum
Open collector (5 mA)
EXT SPKR
T1/E1
MARC AUDIO
MARC DATA
HDLC
TTL
Drive PA Control
PA Control
PA Control
0 V
21.6 V to 32 V
RS 422
RS 422
RS 422
RS 422
13
(Rear Panel)
CN7
2
Supply
(shown in
off position)
CN8
1 L
2 N
3 E
Power
Supply
CN1
L
N
E
CN6
CN1-2
CN4
CN9
L
N
PSU OK
CN6-3
CN6-5
CN6-4
0 V
PSU off
PSU
Regulation
Connections
Name
CN6-6
CN6-2
CN6-1
0 V
PSU OK
0 V
0 V OK
CN4-3
CN4-1
PSU off
PSU off 0V = 0ff
2
2
(Rear Panel)
Ground Supply 0 V
29 V
V Unreg
29 V
Remote Supply On/Off
Line In -
50 W = 670 mV
Characteristic
TTL - High for fan on
TTL - High for bias on
PA Bias EnableCN2-3
CN2-5
CN2-4
Reflected Power
Fan Enable
Drive
Connections
Name
CN2-6
CN2-2
CN2-1
PA Temperature
Drive Detect
10 mV/°C + 0.5 V
0.5 V for +10 dBm
CN10-1
PA Count
25 Hz 1 Amplifier
12.5 Hz 2 Amplifiers
6.25 Hz 3 Amplifiers
PA Control
CN10-2
CN10-3
CN10-4
CN10-5
CN10-6
CN1-1
CN1-2
CN2-1
CN2-2
CN3-1
CN3-2
CN1/2/3 - 1
CN1/2/3 - 2
Amplifier 1/2/3
-1
-2
Forward Power Sense
RF Drive
17 dBm ± 1 dB
1 dBm carrier
(-30.5 dBc ± 0.9 dB)
CN4
CN5
CN6
7
5
6
4
Drive CN4/5/6
Connections
Amplifier 1/2/3
2
3
1
Characteristic
Name
Fail 3
9
8
Name
Ground
14
15
13
12
11
Facilities
Connections
Processor
10
Characteristic
0 V
7
5
6
4
2
3
1
8
9
14
15
13
12
11
10
PA Temperature
10 mV/°C + 0.5 V
50 W = 670 mV
TTL - High for fan on
TTL - High for PTT
PTT
Reflected Power
Fan Enable
Drive Detect
0.5 V for +10 dBm
N/A
TTL - High for present
TTL - High for keyedAmplifier keyed
Not used
Present
TTL pull-up active low
N/ANot used
dc Detect
ac Detect
Open collector
15 V on, 0 V off
Remote on/off 0 V=off, open collector=on
N/ANot used
CN11
Drive
CN11-1
CN12-2
CN11-2
0 VGround
Remote
on/off
0 V=off,
open collector=on
Input-1
CN2-2
CN3-1
Characteristic
Open circuit OK
0 V = on
0 V
Connections
0 to 4 V / 0 to 6 V
Connections
Regulator Drive
Name
CN2