Transcript CricketSat Receiver Assembly Manual Mike Fortney 04/09/2004 Index • • • • • • • • • • Parts List Parts Layout Completed Board - Top View Circuit Board Assembly Enclosure Modifications Final Assembly Testing Troubleshooting Schematic More sections to be added: Features,

CricketSat Receiver
Assembly Manual
Mike Fortney
04/09/2004
Index
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Parts List
Parts Layout
Completed Board - Top View
Circuit Board Assembly
Enclosure Modifications
Final Assembly
Testing
Troubleshooting
Schematic
More sections to be added: Features, Specifications,
Circuit Description, Normal Operation, Data Logging with
a Computer, Optional Accessories
Parts List (1 of 2)
• Verify that you have the following parts in your kit. If not send an
email to [email protected]
• Use the photo two pages ahead to identify parts
• White plastic enclosure with built-in speaker
• Antenna
• Green printed circuit board
• 9-Volt battery
• 9-Volt battery snap connector
• Power switch
• RF receiver module
• LM386 IC chip
• 8-pin DIP socket
• 5-Volt regulator (black 3-pin device)
• Red and green LEDs
Parts List (2 of 2)
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Two black tubular LED standoffs
Protection diode
Audio jack
External power jack
Blue 220uF coupling capacitor
Five small yellow 0.1uF capacitors
Larger yellow 10uF capacitor
Volume control potentiometer
10 ohm resistor, brown-black-black-gold
Two 750 ohm resistors, violet-green-brown-gold
180K ohm resistor, brown-gray-yellow-gold
Parts Layout
J3 not installed
Completed Board - Top View
Audio Data Jack
Antenna Coax Cable
Power Jack
Twisted Braid
Data LED
(Red)
Power LED
(Green)
RF Receiver
Module
Volume Control
Potentiometer
Power Switch
LM386
Amplifier IC
Battery Leads
(Red - Right
Black - Left)
Speaker Leads
(Non-Polarized)
Coupling Capacitor
5-Volt Regulator
(flat side outward)
Circuit Board Assembly (1 of 4)
• Refer to layout images on previous pages
• Install the parts in the following order:
• Resistors
– R1 & R2, 750 Ohm, violet-green-brown-gold
– R3, 180K Ohm, brown-gray-yellow-gold
– R5, 10 Ohm, brown-black-black-gold
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0.1uF capacitors (C1, C3, C4, C5, C7)
D1 diode, banded side is negative (-)
R4, volume control
C2, 10 uF capacitor, banded end is positive (+) , mount
close to the board
Circuit Board Assembly (2 of 4)
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S1, power switch
IC socket, 8-pin DIP, notch towards R3
U3, LM386 IC, notch towards R3
U1, 5-Volt regulator, flat side facing C1, mount as close to
the board as possible
• C4, 220 uF capacitor, banded end is negative (-), indented
end is positive (+)
Circuit Board Assembly (3 of 4)
• J1 & J2, power and audio jacks
• U2, RF receiver module, mount as close to the board as
possible
• D2 & D3, red and green LEDs, mount with standoffs, tight
to the board
– Positive LED lead is the longer of the two leads
LEDs with standoffs
Circuit Board Assembly (4 of 4)
• 9-Volt battery clip, red (+) and black(-) wires
• Antenna coax cable
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Cut to 2 inch length
Strip back insulation 1/2”
Separate braid from center conductor, twist into a second wire
Solder into board as shown below and in layout image
RF Receiver Module
DO NOT use this hole
Twisted Braid in big hole
Center conductor this hole
Top of edge of board
Enclosure Modifications(1 of 2)
• Remove the two screws from back of the enclosure and
remove the back cover
• Drill holes where indicated by the black dots shown below
• Center punch the hole first to insure proper alignment
• Drill holes using a 1/8 inch drill bit
1/8” holes for the LEDs
Enclosure Modifications(2 of 2)
• Cut out the blacken shapes shown below using a nibbling
tool, file or a saw
• Remove the template stickers once complete and clean
rough edges with a file
Remove
material
Remove material
Final Assembly(1 of 2)
• Remove two circuit board mounting screws from enclosure
• Solder speaker wires to circuit board
• Mount antenna into center slot and tighten into place
Route battery cables
Circuit board mounting screw
Guide post and hole
Antenna slot
Circuit board mounting screw
Guide post and hole
Final Assembly(2 of 2)
• Fit circuit board into place in following sequence
– Use previous diagram to aid in this assembly
– Bend RF receiver module slightly towards antenna coax cable
– Lower into place, and mate switch lever with plastic thumb slider
piece on inside of enclosure
– Align and lower circuit board guide holes over enclosure vertical
guide posts
– Press and wiggle circuit board until LEDs pop through holes of
front of enclosure
– If problem seating board, check that coax cable is not between RF
module and speaker. If so, move cable, and repeat above steps.
– Secure circuit board with two screws
• Route battery cable, but DO NOT install the battery yet
• Attach back of enclosure and secure with screws
Testing
• Slide power switch all the way up. It is a three-position
switch with only the top position as “ON”
• Using a multimeter, perform a short circuit test on the
battery clip, reverse the leads and repeat. You should
measure no values less than 5K ohms.
• Attach the battery and its cover
• The unit should be “ON” indicated by the green LED
• The red LED may briefly flash as the unit is switched on
• Turn the volume control to a mid position and you should
hear a hiss from the speaker
• Test the unit with a CricketSat. The red LED should
mimic the CricketSat LED at distances of 25 to 100 feet
Troubleshooting
• No sound or lights, no smoke
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Try a new battery
Insure that slide switch is working properly
Check if battery leads correctly attached to board, red +, black Check if D1 diode is properly installed, white band Check if amplifier IC and RF receiver modules installed properly
• No sound, but lights
– Turn volume control to a median setting. Should hear hissing
sound
• Does not receive CricketSat tone or pulses
– Receiver module may be faulty or need re-tuning