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SERVICE MANUAL
AM/FM Stereo Double Tuner
Effective : July, 2003
S-0097A
1 SPECIFICATIONS
2
FM Tuner Section (Without notes 98.1 MHz, 65 dBf)
Tuning Range .................. 87.5 MHz 107.9 MHz (200 kHz steps)
Usable Sensitivity (IHF) ............................................ Mono: 15 dBf
50 dB Quieting Sensitivity ................ Mono: 21 dBf, Stereo: 41 dBf
Total Harmonic Distortion (1 kHz) ...... Mono: 0.3%, Stereo: 0.4%
Frequency Response ............................ 30 Hz 15 kHz,
1.5 dB
Stereo Separation (1 kHz) .................................................... 40 dB
Signal-to-Noise Ratio ........................ Mono: 67 dB, Stereo: 63 dB
AM Tuner Section
Tuning Range ........................ 530 kHz 1,710 kHz (10 kHz steps)
Usable Sensitivity ............................................................ 64 dB/m
Total Harmonic Distortion ...................................... 1% at 85 dB/m
Signal-to-Noise Ratio ........................................ 40 dB at 85 dB/m
General
Power Requirements............................................ 120 V AC, 60 Hz
Power Consumption .............................................................. 12 W
Dimensions (W x H x D).................................. 435 x 95 x 270 mm
(17-1/8" x 3-3/4" x 10-5/8")
Weight (net) ...................................................... 4 kg (8-13/16 lbs)
Standard Accessories .............................. Remote Control Unit x 1
Battery (AAA, R03, UM-4) x 2
AM Loop Antenna x 1
FM adapter x 1
RCA Cord x 2
Owner's Manual x 1
Improvements may result in specifications and features
changing without notice.
NOTES
PC boards shown are viewed from parts side.
The parts with no reference number or no parts number in the
exploded views are not supplied.
As regards the resistors and capacitors, refer to the circuit diagrams
contained in this manual.
£
Parts marked with this sign are safety critical components. They
must be replaced with identical components - refer to the
appropriate parts list and ensure exact replacement.
2 RS-232 COMMANDS
3
General Information:
Data Rate:
19,200 baud
Parity:
None
Word length:
8 data bits, 1 stop bit
Handshake:
No RTS/CTS handshaking
Connections:
simple 3 wire (Rx, Tx, Gnd) interface
Data Entry Protocol:
Command Codes:
Character
Range
Example
X:
0,1
X1 = Power On, X0 = Power Off
T:
1,2
T1 = Tuner 1, T2 = Tuner 2
B:
1,2
B1 = AM, Band 2 = FM
P:
00 - 30
P01 = Preset 1, P30 = Preset 30, P00 (just for status) = No Preset Selected
F:
4 numbers
F0890 = 890 AM, F1045 = 104.5 FM
A:
0,1
A0 = Seek Down, A1 = Seek Up
M:
0,1
M0 = Step Down 1 step, M1 = Step Up 1 step
S:
Signal Lock /
S00 (just for status) = no signal, no stereo, S01 = invalid
Stereo Presence
S10 = signal lock (mono), S11 = signal lock (stereo)
Q:
Query status
Q1 = Status of Tuner 1, Q2 = Status of Tuner 2
of tuner
Q3 = Status of both tuners, 1 then 2
N:
0,1
N0 = Step Down 1 Preset, N1 = Step Up 1 Preset
L:
01 - 30
L01 = Set Station as Preset #1
Command Examples:
T1B2P01<cr> would command tuner #1 to select band 2 (FM) and tune to FM preset #1
T2B1F1070L03<cr> would command tuner #2 to set AM frequency 1070 kHz as AM preset #3
This command however, would not change the current station tuned on Tuner #2
To select a station to be tuned and
THEN set that station as a preset, would require two commands:
T2B1F1070<cr> would command tuner #2 to select band 1 (AM) and tune to frequency 1070 kHz.
T2L03<cr> would command tuner 2 to set the currently tuned station (in this example AM 1070) as AM preset #3
Query Example:
Q1<cr> would solicit the following response:
Feedback as to the status of tuner #1, which would include band select, station preset, frequency
tuned, signal lock and stereo presence. The response string would look like this:T1B2P00F1011S11
T1 (tuner 1) B2 (FM), P00 (no preset selected), F1011 (frequency 101.1 MHz), S11 (signal lock & stereo)
Shortcut Commands:
Note: examples below are assuming Tuner 1 is in FM stereo mode and tuned to a station
Command
T1N1<cr>
T1L01<cr>
T1S10<cr>
T1M1<cr>
T1A0<cr>
T1B1<cr>
1 = locked, 0 = not
Tuner 1 would go to AM mode and tune to the last previously tuned AM station
Tuner 1 would step up to the next higher preset number
Tuner 1 would set the currently tuned station as FM preset #1
Tuner 1 would switch the FM mode to mono
Tuner 1 would step up the frequency 0.2 MHz
Response/Action
Tuner 1 would go into "seek down" mode
Preset #
Frequency Setting
Seek Up / Down
Step Up / Down
Set Preset
The serial buss should follow a standard serial communications protocol using Line
oriented ASCII data stream. The command line must be followed with a carriage
return for the unit to respond. The unit should not echo characters received back
to the host.
1 = stereo, 0 = mono
ask for tuner status
Preset Step Up / Down
Function
Power Off / On
Tuner #
Band #
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INCLUDED ACCESSORIES