Bose 3-2-1 Service Manual

							11
Preliminary
4. DVD Drive Replacement
4.1 Install the two Phillips-head screws (6)
that were removed in step 3.5. These screws
should be installed into the two threaded
holes located on the underside of the drive
(5) near the front. These screws will protrude
from the chassis of the drive and are used to
help align the drive with the console casting
(14).
4.2 On the rear of the DVD drive, plug in the
ATAPI (8) cable and power (7) cables. Be
sure that the strain relief on the ATAPI cable
is on the end of the cable that plugs into the
main PCB (20). Also verify that the mode
select jumper is in place in the MASTER
location. Refer to the diagram on the top of
the DVD drive.
4.3 In order to make installing the DVD drive
easier, you should remove the bezel  sub
assembly (27). Place the console on the
bench so that the front panel is facing toward
you. Using a small flat-tip screwdriver, press
in the tabs that secure the bezel sub assem-
bly to the console base (21). There are two
tabs located at the top of the base behind the
front panel near the LCD display PCB (26)
ribbon cable and the heatsink (9). There are
two more inside the opening for the DVD
drawer. Once you get these released, turn
the console on its side and release the four
tabs on the bottom of the console base
directly behind the bezel sub assembly.
Place the console back on its feet and place
the bezel sub assembly face down on a soft
surface to avoid scratching the lens. Do not
disconnect the ribbon cable to the LCD
display  PCB.
4.4 On the DVD mechanism, use a straight-
ened paper clip or a small  probe in the
emergency drawer release hole of the DVD
mechanism to release the DVD drawer latch.
This hole is located on the right front of the
mechanism. Slowly slide the DVD drawer
partially out of the mechanism.4.5 Before you can install the DVD drive (5),
you must replace the ATAPI shield (4) on the
back of it. If you have the formed metal type
shield, simply slide it in place over the back
of the drive. If your drive used the folded foil
type shield, you will need to use a new
shield, part number 260471-001. To install
the folded foil shield, perform the following
steps:
• With the shield as shown, bend the
  bottom section of the shield 90 degrees
  away from you. Peel off the plastic on this
  section. You should have a rectangular
  section with the adhesive facing down.
• Align the exposed adhesive section with
  the rear of the casting (14) near the input
  and output jacks. You will place this section
  of the shield on the casting just past the lip
  at the back of the casting. If you place the
  shield on top of this lip the drive will not sit
  flat in the console. One of the tabs of the
  casting should protrude through the small
  rectangular knock-out section of the foil
  shield. Remove the knock-out section and
  discard it.
• Press the adhesive foil shield section in
  place on the casting, leaving the rest of it
  standing up along the rear of the console
  base (21).
4.6 Plug the DVD drive cables into their
corresponding jacks located at the rear of
the main PCB assembly (20). Route the
power cable (7) behind the ATAPI cable (8),
but not under the DVD drive.
4.7 Place the DVD drive down onto the
casting inside the console. Make sure that
it is sitting flat on the casting.

	
	 


 
						

							12
Preliminary
Note: To assure correct clamping, you
should use a new DVD clamp when installing
the DVD drive into the console.
4.8 Align the clamp (3) over the DVD drive
(5) and with the ears of the casting (14).
Press down firmly on the clamp until it snaps
into place on the casting.
4.9 Place the drawer opening in the bezel
sub assembly (27) over the DVD drive
drawer, allowing the drawer to extend
through the opening. Align the slots in the
DVD drawer bezel (28) with the DVD drawer.
Slide the DVD drawer bezel down until it
snaps in place. Be careful to not damage the
DVD drawer. Snap the bezel sub assembly
in place on the front of the console base (21).
4.10 At the rear of the DVD drive, peel the
protective plastic off of the side and top
sections of the foil shield. Press the adhesive
side sections in place, and then press the
top section in place.
4.11 Perform procedure 2.
5. Main PCB Removal
5.1 Perform procedure 3.
5.2 Unplug the ribbon cable at J6500 on the
main PCB (20). This cable runs to the display
PCB (26).
5.3 Using a size T-15 Torx head driver,
remove the nine screws (13) that secure the
casting (14) and main PCB (20) to the
console base (21).
5.4 Use a small flat-tip screwdriver to re-
lease the clip (12) that secures the amplifier
output IC to the heatsink (9). Use a small flat-
tip screwdriver to carefully pry the output IC
slightly away from the heatsink. Lift the
casting and heatsink assembly out of the
chassis.5.5 On the rear of the console base (21),
unclip the four tabs that secure the I/O panel
(19) to the base. Pull away and down on the
top of the I/O panel until it unclips from the
base. It should come off completely.
5.6 Carefully lift the front edge of the main
PCB (20) out of the base. Slide the main
PCB forward slightly until it clears the jacks
on the back of the board. Lift the main PCB
and casting (14) out of the base.
6. Main PCB Replacement
6.1 Align the main PCB (20) with the console
base (21). Angle the main PCB so that the
jacks will protrude through the opening in the
rear of the base and set it in place.
6.2 On the heatsink (9), use a straight-edge
razor blade to scrape off any thermal phase
change pad (11) material. Take care to not
scratch the coating on the heatsink. Clean
off any residue with alcohol. On the main
PCB, clean any thermal phase change pad
residue off of the output IC. apply a small
amount of thermal compound to the back of
the output IC.
6.3 On the main PCB, check to make sure
that the large thermal pad (16) is in place on
top of the DVD decoder IC (U3000) and the
small thermal pad (17) is in place on top of
the CODEC IC (U4000). Align the casting
(14) with the console base (21) and slide
it down over the main PCB. It will slide down
onto the main PCB slightly away from the
output IC. Slide the casting over against the
output IC. Replace the output IC clip (12).
Make sure to place the clip near the top of
the output IC.
6.4 Secure the main PCB and casting to the
chassis using the nine Torx-head screws
(13) removed in step 5.3, starting with the
hole nearest the heatsink, then across to
the hole near the ribbon cable and then the
rest. Do not overtighten these screws.

	
	 


 
						

							13
Preliminary
6.5 Align the I/O panel (19) with the connec-
tors on the main PCB. Press the I/O panel in
place on the console base (21). It should
snap in place and be flush with the base all
around its perimeter.
6.6 Perform procedure 4.
7. LCD Display PCB Removal
7.1 Perform procedure 3.
7.2 On the main PCB (20), unplug the ribbon
cable at connector J6500. This cable runs
to the LCD display PCB (26). Peel off the foil
ground strap (25) located directly under the
ribbon cable. This foil strap provides a
common ground between the main PCB and
the LCD display PCB.
7.3  Place the console on the bench with the
front panel facing toward you. Using a small
flat-tip screwdriver, press in the tabs that
secure the bezel sub assembly (27) to the
console base (21). There are two located at
the top of the base behind the front panel
near the ribbon cable and the heatsink (9).
There are two more inside the opening for
the DVD drawer. Once you get these re-
leased, turn the console on its side and
release the four tabs on the bottom of the
base directly behind the bezel sub assembly.
Take care not to drop the LCD display PCB.
It is not secured in the bezel sub assembly.
7.4 Place the bezel sub assembly face down
on a soft surface. Take care to not scratch
the soft plastic lens. Lift the LCD display
PCB out of the bezel sub assembly. Using a
small flat-tip screwdriver, flip up the edge of
the ZIF connector at J2. Unplug the ribbon
cable. Take care to not plug and unplug this
cable too many times. It has a carbon coat-
ing that wears off after just a few removals
and insertions, ruining the cable.8. Display PCB replacement
8.1 Using a small flat-tip screwdriver, flip up
the edge of the J2 ZIF connector on the
LCD display PCB (26). Slide the bezel sub
assembly (27) ribbon cable into the J2 ZIF
connector on the LCD display PCB. The
carbon traces on the cable should face down
toward the board. Snap the J2 ZIF connector
down into place.
8.2 Align the LCD display PCB with the
bezel sub assembly so that the LCD display
is located behind the lens of the bezel sub
assembly.
8.3 Align the bezel sub assembly and LCD
display PCB assembly with the front of the
console base (21). Feed the LCD display
PCB ribbon cable and the foil ground strap
(25) through the small rectangular opening
at the front of the base. Snap the bezel sub
assembly and the LCD display PCB in place
on the front of the base.
8.4 Secure the foil ground strap to the corner
of the casting (14) nearest the point it enters
the chassis. Be sure to press the foil se-
curely in place. Plug the LCD display PCB
ribbon cable into the main PCB (20) at
J6500. The ribbon cable should feed straight
into the connector with no twist.
8.5 Perform procedure 2.
  Array Procedures
1. Grille Removal
1.1 Wrap some masking tape around the
shaft of a flat-tip screwdriver approximately
1/2" back from the end. This is needed to
protect the plastic housing of the array.

	
	 


 
						

							14
Preliminary
  Disassembly/Assembly Procedures
  (continued)
Array Procedures (continued):
1.2 Place the array on its back on a bench.
Use your thumb to press down on the array
grille just where at the top of the curve. At
the same time, use the screwdriver to pry
the end of the grille off of the array housing.
It should come free of the housing. Repeat
this step at the other end of the grille. Lift the
grille off the housing.
2. Grille Replacement
2.1 Align the grille so that the Bose
® logo is
facing the same direction as the arrows on
the front of the array housing.
2.2 Press the grille in place. It should latch
at each end of the grille to the housing.
  Test Procedures
Console Procedures
Equipment required:
Audio signal generator
Digital multimeter
Analog to SPDIF converter
SPDIF to optical converter
AM/FM signal generator
Abex  test  DVD  (TDV-540A)
Video monitor
DC power supply
Video cable
Optical cable
Test Setup
Set up the unit under test as shown in
Figure x for the following tests.
1. Button Test
1.1 Turn on the unit under test (UUT ) using
the ON/OFF button on the console. Observe
that the display lights up.




2. Analog Audio Test
2.1 Apply a 1 Vrms, 1 kHz signal to the left
and right VIDEO 1 audio analog inputs.
2.2 On the console, select the VIDEO 1
input.
2.3 Measure the output level at the line
outputs on the console rear panel. It should
be 1 Vrms 
+ 10%.
2.4 Repeat steps 2.1 to 2.3 for the VIDEO 2
audio analog inputs.
3. Coaxial Digital Audio Test
3.1 Connect the audio signal generator to the
input of the analog to SPDIF converter.
3.2 Connect the output of the SPDIF con-
verter to the VIDEO 1 coaxial digital input.
3.3 Apply a 500 mV, 1 kHz signal to the
analog input of the SPDIF converter.
3.4 On the console, select the VIDEO 1
source.
3.5 Measure the output level at the line
outputs on the console rear panel. It should
be 500 mVrms 
+ 10%.
3.6 Repeat steps 3.1 to 3.5 for the video 2
digital coaxial input.
3.7 Repeat steps 3.1 to 3.5 for the AUX
digital coaxial input.
4. Optical Digital Audio Test
4.1 Connect the audio signal generator to
the input of the analog to SPDIF converter.
4.2 Connect the output of the SPDIF con-
verter to the input of the SPDIF to optical
conver ter.
4.3 Connect the output of the optical con-
verter to the VIDEO 1 optical input. 
						

							15
Preliminary




4.4 Apply a 250 mV, 1 kHz signal to the
analog input of the SPDIF converter.
4.5 On the console, select the VIDEO 1
source.
4.6 Measure the output level at the line
outputs on the console rear panel. It should
be 250 mVrms 
+ 10%.
5. Video Tests
5.1 Connect the video generator to the
COMPOSITE VIDEO  INPUT  only.
5.2 Connect the video monitor to the COM-
POSITE  VIDEO  OUTPUT.
5.3 Set the video generator to display a test
pattern.
5.4 On the console, select the VIDEO 1
source.
5.5 Confirm that the test pattern appears on
the video monitor.
5.6 Connect the video generator to the S-
VIDEO input only.
5.7 Connect the video monitor to the S-
VIDEO output.
5.8 Set the video generator to display a test
pattern.
5.9 On the console, select the VIDEO 1
source.
5.10 Confirm that the test pattern appears on
the video monitor.
6. Internal DVD Video Test
6.1 Load the test DVD into the console.
6.2 Connect the video monitor to the S-
VIDEO output of the console.6.3 On the 3-2-1 system remote control,
press  the  CD/DVD  button  to  star t playback
of the DVD disc.
6.4 Verify that video appears on the video
monitor.
7. DVD Audio Test
7.1 Load the test DVD into the console.
7.2 If necessary, connect the Twiddler
TM
arrays to the 9-pin D-sub connector.
7.3 On the 3-2-1 system remote control,
press  the  CD/DVD  button  to  star t playback
of the DVD disc.
7.4 Verify that the audio plays.
8. CD Playability Tests
Test discs required:
ABEX TCD-714R
ABEX TCD-721R
ABEX TCD-725R
ABEX TCD-732R
Philips TS4
8.1 Insert the ABEX TCD-725R test disc
into the console CD/DVD tray.
• Play the defect tracking (interruption)
  track. Verify that the track plays properly.
  The nominal is a 1.0 mm defect, 0.8 mm
  limit.
• Play the defect tracking (black dot) track.
  Verify that the track plays properly. The
  nominal is a 1.0 mm defect, 0.8 mm limit.
• Play the defect tracking (fingerprint)
  track. Verfiy that the track plays properly.
  The nominal is a 75 um defect, 65 um
  limit.
8.2 Insert the ABEX TCD-721R test disc
into the console CD/DVD tray. Play the
defect  tracking  (scratch)  track. Verify  that
the disc plays properly. The nominal is a
1.6 mm defect, 1.0 mm limit. 
						

							16
Preliminary
Figure 2. Laser voltage test points
Figure 3. Laser current rating label
8.3 Insert the ABEX TCD-714R test disc
into the console CD/DVD tray. Play the
defect  tracking  (eccentric  disc)  track. Verify
that the disc plays properly. The nominal is a
280 um defect, 210 um limit.
8.4 Insert the ABEX TCD-732R test disc
into the console CD/DVD tray. Play the
defect  tracking  (warped  disc)  track. Verify
that the disc plays properly. The nominal is a
1.0 mm defect, 0.7 mm limit.
8.5 Insert the Philips TS4 test disc into the
console  CD/DVD  tray.  Play  tracks  1  through
15, verifying that each track cues up within
the test limits. Nominal is 2 seconds or less,
limit 3 seconds.
9. Laser Current Measurement Procedure
Note: The 3-2-1 system console CD/DVD
drive uses a separate laser for each me-
dium, CD or DVD. You will need to perform
these tests using a CD disc to measure the
CD laser current and a DVD disc to measure
the DVD laser current.
9.1 Remove the console top cover using
Disassembly/Assembly  procedure  1.
9.2 Remove the bottom cover of the CD/
DVD mechanism to allow access to the
board.
9.3 Connect the DVD drive to the console
using the ATAPI and DVD power extender
cables. This will allow better access to the
test points while playing the DVD or CD disc.
9.4 Insert a CD disc into the mechanism tray.
Start the disc playing so that the timer on the
display is counting.
9.5 Measure and record the voltage at the
point 5V and L5V. Be sure to use the GND
pad near the 5V and L5V points.
See Figure 2.
9.6 Subtract L5V from 5V (5V-L5V) and
record the laser voltage (LmV).9.7 The measured laser current value should
be + 20% of the printed current rating on the
pickup head (PU). PU-.20PU
						

							17
Preliminary




 3-2-1 Console Tuner Adjustments/
Measurements
The following tests can be performed without
the use Of An IBM compatible PC
Set up the device under test (console) as
shown in the diagram below.
Figure 4. AM Loop Antenna Test Setup
AM Adjustments
For all AM alignments and tests plug the AM
antenna, part number 199824-002, into the
console and position it at least 2 feet away
from the unit. Configure the AM antenna, a
standard test loop and RF generator as
shown below to create the specified field
strength for each test. Set the AM modulation
to 30% with a 1kHz signal. Refer to the AM
Setup procedure below
10. AM RF Tracking
10.1 Connect an AC meter to the AUX OUT
jacks.
10.2 Inject an 1500kHz RF signal at a level
of 90 dBuV emf, 30% modulation, 1 kHz
modulation frequency.10.3 Tune the console to 1500 kHz and
adjust the red slug (T2004) for maximum
audio level at the left or right audio output.
Verify that the level is greater than 30
mVrms.
10.4 Change the RF frequency to 600kHz
and re-tune the console to 600kHz.
10.5 Adjust the black slug (T2004) for maxi-
mum level. Verify that the level is greater
than 30 mVrms.
10.6 Repeat steps 10.2 to 10.5 until maxi-
mum audio output is obtained without the
need for further adjustment.
11. AM Sensitivity
11.1 Inject a 1080kHz RF signal at a level of
74 dBuV emf, 30% modulation, 400 Hz
modulation frequency.
11.2 Tune the console to 1080 kHz.
11.3 Connect a dB meter to the tape output
jacks and reference it (set to 0dB) to the
current audio output.
11.4 Remove the AM modulation and mea-
sure the tape output. The reading should be
less than -20dB.
FM Adjustments
Note: Unless otherwise noted, set the RF
generator for 1 kHz, mono modulation, pilot
off and 75 kHz deviation.
Power levels for FM testing are given in dBf
at the antenna input to the unit.
Typically a test setup will consist of an RF
generator with a 50 ohm output impedance
and a 50 ohm to 75 ohm impedance match-
ing element. The two most commonly used
impedance matching element are a resistive
network which has a 5.7dB insertion loss
and a “lossless” transformer which has a
0.5dB insertion loss.
Unit under test
External AM 
loop antenna
AM test 
loop antenna
RF signal generator
24 inches (60cm)
24 inches (60cm) 
						

							18
Preliminary




To find the required setting in dBuV emf from
a given dBf value for an RF generator with a
50 ohm output impedance use the conver-
sions given below.
Note: For generators with RF level resolution
of only 1dB round up.
12. FM Distortion Measurement/Adjustment
12.1 Inject a 98.1MHz RF signal at a level of
65dBf into J2000.
12.2 Tune the console to 98.1MHz.
12.3 Measure the distortion plus noise
(THD+N) at the tape output. If it is less
than or equal to 0.50%, verify that the audio
level is greater than 190 mV. If these are not
the measurements you have, proceed to
step 12.4.
12.4 If the THD+N is greater than 0.55%, or
the audio level is less than 190 mV, adjust
T2001 for minimum distortion. Verify that the
level is greater than 190 mV and the distor-
tion is less than 0.55%.
13. FM Sensitivity
13.1 Inject a 98.1MHz RF signal at a level of
19 dBf into J2000.
13.2 Measure the THD+N at the tape output.
It should be less than or equal to 3%.
14. FM Stereo Separation
14.1 Inject a 98.1MHz RF signal set to 1kHz
left only modulation with 10% pilot modulation
and 75kHz total deviation at a level 65dBf
into J2000.14.2 Reference a dB meter to the left tape
output.
14.3 Switch the RF signal modulation to right
only channel.
14.4 Measure the left tape output. It should
read -25dB or less.
Computer Assisted Tuner Test Procedures
Note: Refer to the computer set up instruc-
tions in the appendix for proper connection
to an IBM compatible computer.
Refer to Figure 4, AM antenna setup dia-
gram, to achieve the proper field strength
for the given RF generator setting.
Some of the commands will automatically
set the calibration, requiring only an external
RF signal at the input of the tuner. Other
commands require the technician to make
measurements and adjustments.
Before commencing with the tuner measure-
ments/alignments enter the command LXOF
to disable communication between the
display microprocessor and the system
microprocessor You should receive an ACK
(acknowledge) response on the computer’s
screen. If not then re-try until successful. To
re-enable communication enter LXON.
AM Adjustments
Enter the command TUAM to switch source
to AM.
15. AM Alignment
15.1 Inject an 1500 kHz RF signal at a level
of 90 dBuV emf.
15.2 Enter the command TUSF15000 into
the computer. This will tune the unit to 1500
kHz.
15.3 You should receive the response
“ACK>” (acknowledge) on the computer’s
screen.
Using a resistive
network
(5.7dB loss)Subtract 1.3dB. eg:
65dBf => set generator
to 63.7 dBuV emf
Using a
“lossless”
transformerSubtract 6.5dB eg:
65dBf => set generator
to 59.5 dBuV emf 
						

							19
Preliminary




Note: If you receive an error response on
the computer screen, enter the TUAM com-
mand to ensure the correct mode is selected
and re-enter the command in 15.2.
To verify the AM tuning frequency enter the
TUGF command to get the presently tuned
frequency. The response on the computer
screen should be  “1500“ followed by an
“ACK>”
15.4 Adjust the red slug of T2004 for maxi-
mum audio output. Verify that the level is
greater than 40 mVrms.
15.5 Inject a 600kHz RF signal at a level of
90 dBuV emf.
15.6 Enter the command TUSF06000 into the
computer. This will tune the unit to 600 kHz.
15.7 You should receive an ACK response
on the computer screen.
15.8 Adjust the black slug of T2004 for
maximum audio output. Verify that the level is
greater than 40 mVrms.
15.9 Repeat steps 15.1 through 15.8 until the
audio level is at a maximum without adjust-
ment.
16. AM Stop Level
16.1 Inject a 1080 kHz RF signal at a level of
78 dBuV emf, 30% modulation at 1 kHz.
16.2 Enter the command TUSF10800 into the
computer. This will tune the unit to 1080 kHz.
16.3 You should receive an “ACK>” response
on the computer screen.
16.4 Enter the command TUAR. The unit will
then sample the AM S-meter level, and store
it in the EEPROM as the stop level and
return an “ACK>” response.16.5 Enter the command TURA to see the
stored level; the response on the computer
should be as follows: XX (where XX is the
stored level in hexadecimal form).
The current AM S-meter voltage level  =
5 x (stored level in decimal) / 256
FM Tuner Tests
For all FM measurements and adjustments,
the RF signal is to be connected from the
signal generator to J2000 via a 50 to 75
Ohm impedance matching network.
The input levels are to be as read at the
input of J2000.
FM Adjustments
Enter the command TUFM to switch source
to FM.
17. FM IF Centering Adjustment
17.1 Inject a 98.1MHz, 1 kHz mono modula-
tion, pilot OFF, 75 kHz deviation RF signal
(83.0 MHz for Japan) at a level of 50dBf into
J2000.
17.2 Enter the command TUSF09810
(TUSF08300 for Japan) into the computer.
This will tune the unit to the appropriate
frequency.
17.3 You should receive an ACK response
on the computer screen.
Note: If you receive an error response on
the computer screen, enter the TUFM com-
mand to ensure the correct mode is selected
and re-enter the command in 17.2.
To verify the FM tuning frequency enter the
TUGF command to get the presently tuned
frequency. The response on the computer
screen should be the “98.1” (“83.0” for
Japan) 
						

							20
Preliminary




17.4 Enter the command TUIF into the
computer. The unit will then go through an
algorithm that determines the optimum offset
for the local oscillator (L.O.) setting to ac-
count for filter variances in the IF strip. This
offset is then stored in the EEPROM.
Enter the command TUGI to see the stored
offset; the response on the computer should
be as follows: “TUGI    X >” followed by an
“ACK>” (where X is the stored offset).  The
actual frequency offset of the L.O. is this
offset multiplied by 25kHz. Valid offsets are
–1, 0 or 1
18. FM Distortion Measurement/Adjustment
18.1 Inject a 98.1 MHz, 1 kHz mono modula-
tion, pilot OFF, 75 kHz deviation (83.0 MHz
for Japan) RF signal at a level of 65dBf into
J2000.
18.2 Enter the command TUSF09810
(TUSF08300 for Japan) into the computer.
This will tune the unit to the appropriate
frequency.
18.3 Measure the distortion plus noise
(THD+N) at the tape output. If it is less
than or equal to 0.50%, verify that the audio
level is greater than 190 mV. If these are not
the measurements you have, proceed to
step 18.4.
18.4 If the THD+N is greater than 0.55%, or
the audio level is less than 190 mV, adjust
T2001 for minimum distortion. Verify that the
level is greater than 190 mV and the distor-
tion is less than 0.55%.
19. FM Sensitivity
19.1 Inject a 98.1MHz, 1 kHz mono modula-
tion, pilot OFF, 75 kHz deviation (83.0 MHz
for Japan) RF signal at a level of 19 dBf
(21dBf for Japan) into J2000.
19.2 Measure the THD+N at the tape output.
It should be less than or equal to 3%.20. FM Stereo Separation
20.1 Inject a 98.1MHz (83.0 MHz for Japan)
RF signal set to 1kHz left only modulation
with 10% pilot modulation and 75kHz total
deviation at a level 65dBf into J2000.
20.2 Enter the command TUSF09810
(TUSF08300 for Japan) into the computer.
This will tune the unit to the appropriate
frequency.
20.3 Reference a dB meter to the left tape
output.
20.4 Switch the RF signal modulation to right
only channel.
20.5 Measure the left tape output. It should
read -25dB or less.
21. FM Stop Level
21.1 Inject a 98.1MHz, 1 kHz mono modula-
tion, pilot OFF, 75 kHz deviation (83.0MHz
for Japan) RF signal at a level of 30 dBf into
J2000.
21.2 Enter the command TUSF09810
(TUSF08300 for Japan) into the computer.
This will tune the unit to the appropriate
frequency.
21.3 You should receive an ACK response
on the computer screen.
21.4 Enter the command TUFR. The unit will
then sample the AM S-meter level, and store
it in the EEPROM as the stop level.
21.5 Enter the command TURF to see the
stored level; the response on the computer
should be as follows: XX (where XX is the
stored level in hexadecimal form).
The current FM S-meter voltage level =
5 x (stored level in decimal) / 256.