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5-
1
4
Troubl
esh
ooting
Sep
tem
ber
26
, 20
03
6
881
096
C77-
O
Fi
gur
e 5-6.
W4 C
o
ntr
o
l Head (Sheet
2
of
2)
A
A
CR50 is
Probably Open
Check
U101-1
Voltage
Is
Voltage
33 to 39V
?
Is
Voltage
over 40V
?
Is
Voltage
20 to 25V
?
Is
Voltage
11 to 14V
?
Choose the
closest voltage
range and
proceed
Is
Reset Line
OK
?
Check U1: U4: Y1 for proper
operation. U1-1 must go
low momentarily after
power up, then stay high
to properly initialize U1
Repair and
Return to
Start
CR50 is
probably open
Remove VF
Display
Check T60
pins 1, 2, 3
continuity
Check
C52
Check U4 and
cabling for source
of problem
Repair and
Return to
Start
START
VERY BRIGHT DISPLAY
VARIES WITH SUPPLY VOLTAGE
Check VF Display
Filament Voltage with an
AC voltmeter between pins
1 and 25 of VF Display. The
voltage should be 2 to 3 Vrms
Check R51, R52,
C51, C52
and repair
OK
?
Is
C52 OK
?
Possible sawtooth
oscillator problem
Remove VF
Display
Observe waveform
at U3-3. Compare
with
Waveform W2
in section 5.8
Return
To
Start
CR51 is probably
open
Remove VF
Display
Repair and
Return to
Start
Q50 may have
been overstressed
during failure
Replace Q50
Check CR51,
Q50 and
Repair
Return
To
Start
Check VF Display
Filament
For Open
Return
To
Start
Check R101, T60
and
Repair
Is
Filament
Open
?
Is
Voltage
Correct
?
Check R50
and T60
pins 4, 5, 6
for continuity
Remove VF
Display and
Replace
Return
To
Start
OK
?
Check U101
and U1 for
proper
operation
Repair and
Return to
Start
Is
waveform
correct
?
Check DC voltage
on U3-2. It should
be 1.5 to 2.0 VDC
Is
voltage
correct
?
Check U3-1
Waveform W3
in section 5.8
Is
waveform
present
?
Check Q50 drain.
Compare to
Waveform W5 in
section 5.8
Check U3, C54,
R56-R60
and Repair
Q50 may have been
overstressed
during failure.
Replace Q50
Return
To
Start
Check R52,
R51, C51
and Repair
Check U3,
R61, Q50,
and Repair
Q50 may have been
overstressed during
failure. Replace Q50
Return
To
Start
Return
To
Start
Return
To
Start
Is
waveform
present
?
Check R61,
Replace Q50
Check T60
and Repair
Q50 may have been
overstressed during
failure. Replace Q50
Turn Power on
with Control Head
connected to radio
Is
display at proper
brightness
level
?
Check for SWB+
voltage on Control
Head PC Board
Is
SWB+ On
?
Check U45
(+5V REG)
Is
+5V OK
?
Check L50,
R55
Continuity
OK
?
Check
U1-6
Is
Voltage
Low
?
No Problem
END
Repair and
Return to
Start
Repair and
Return to
Start
Check Reset
line to see if it is
being held high
by radio
malfunction
A
START
NO DISPLAY OR
VERY DIM DISPLAY
Check SW1, J102,
P102 and Repair:
Return to Start
NO
YES
NO
YES
YES
NO
NO
YES
MAEPF-22618-O
NO
YES
NO
YES
YES
NO
YES
NO
NO
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
YES
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
Is
Voltage
below 10V
?
Repair and
Return to
Start
Содержание ASTRO W5
Страница 2: ......
Страница 12: ...x List of Tables September 26 2003 6881096C77 O Notes ...
Страница 16: ...September 26 2003 6881096C77 O Notes xiv Commercial Warranty ...
Страница 24: ...September 26 2003 6881096C77 O 1 8 Introduction Control Heads Notes ...
Страница 68: ...7 8 Exploded Views and Parts Lists Large Pushbutton Parts September 26 2003 6881096C77 O Notes ...
Страница 125: ......