Document text
Service Manual 151
Issue 1.0
DIVA T51
АМ/ҒМ Типег
| ШЕЛІТЕТЛЕЕЕ - ШЕЙ
Бове о · 9 g
ARCAM
Contents List
Contents list
Circuit description
Circuit diagrams
Component overlays
Circuit board parts list
General assembly parts list
T51 Tuner Circuit Description
Power Supply
Mains voltage selection is made by placing a fuse, of
appropriate value, in the 115V or 230V position.
The single secondary is rectified and regulated and
supplies four regulators.
ZT is always powered when the mains is connected and
keeps the preset memory of the micro controller intact.
The high-value capacitor (C84) will keep this data safe, for
a limited time, in case of mains power failure.
Z5 provides the main 12V supply rail for the RF and audio
circuits. This is always connected, except for the supply to
the FM front end, which is disabled by Q2 when the unit is
turned 'off.
ZA powers the LED back light on the display PCB.
Z6 is the 5V digital supply for the micro controller.
FM Tuner & IF
The FM aerial input is mixed in the front end ЕЕ! which
provides a 10.7MHz IF output. This is filtered and
amplified by ceramic filters СЕ1 & CF2 and the circuit
based around Q9 & Q10. A third filter CF3 can be put in
circuit by fitting jumpers JP1 & JP2 across pins 2 & 4 and
1 & 3 of SK6 respectively. This effectively narrows the IF
band to improve selectivity. Transistors Q17 and Q21 are
part of the AGC circuit. The position of the jumper link
JP7 to either SK10 or SK11 determines from which point
the AGC circuit is triggered. The default is for the jumper
to be fitted to SK10 which minimizes cross modulation
and prevents the IF amp becoming saturated.
The LA1266 (Z9) demodulates the IF at pin 1 into an
audio output at pin 12. The quadrature coil is a
double-tuned device for best distortion performance.
When a station is tuned correctly the 'On Tune' signal goes
low and drives a green LED on the display PCB. This
signal is also used by the auto-stop detection and muting
circuits.
AM Tuner & IF
The LA1266 (Z9) contains the AM RF amplifier, oscillator
and mixer circuitry.
Switching between FM and AM modes is controlled by the
'FM' signal from the micro controller which disables the
AM circuitry of Z9 and switches the path of the audio
signal through Z8.
MW/LW switching is performed by switching transistors
Q12, Q14 & 015.
Each band has its own oscillator and aerial tuning coils,
tuned by a varicap diode all contained within the AM
module L5.
The 450kHz IF signal is filtered by coil and ceramic filter
combination T5.
Birdie Filter
The ‘ Birdie Filter’ (L2) is a four pole low pass filter, flat to
about 53kHz, then with a very steep roll off from then on..
This is designed to reduce co-channel interference in FM
Stereo and cut down on irritating ' birdie’ noises.
Stereo Decoder
Stereo decoding is performed by LA3401 (Z8). The 38kHz
reference signal is accurately created by ceramic resonator
X3 and does not require adjustment.
Stereo separation is adjusted for maximum by preset RV1.
This IC also contains FM/AM audio switching and muting
functions.
Audio Filters & Output
The left and right channel audio outputs from Z8 are
filtered by the de-emphasis network of R1, СІ etc. The
correct de-emphasis network is selected by the position of
jumpers JP3 & JP4 on the pins of SK8. C2 & C102
(220pF) are selected for 50us and C3 & C103 (560pF) for
7505 de-emphasis.
The final filter, based on Z3, is a two-pole low-pass circuit
with a cut-off frequency of around 20КН7. Also included
is a 19kHz notch filter, L1 & СА, that removes most of the
residual pilot tone.
Muting
When the power switch is turned off Q5 is switched off,
enabling the mute circuitry of the stereo decoder (Z8) via
diode D9. This removes the need for output muting
transistors and eliminates switching clicks and pops.
At switch-on the mute is enabled while C21 is charged via
Z8.
In normal use the mute inside Z8 is enabled in three other
Ways:
The AMUTE signal from the micro controller is active at
power-on and for a short time when a preset is changed.
When the band is changed the output is muted by charging
С52.
The audio output must ђе muted whenever the tuner is in
stereo mode and is also off-tune. This is to eliminate noise
during tuning and is provided by Q8 and the MONO and
OFF TUNE control signals.
In Mono mode this mute is disabled so that weak stations
can be heard, despite the noise.
Micro controller
Control of the РАМА T51 tuner is performed by a single
micro controller Z10, LA7230. This also provides keypad
input and drives a LCD directly.
At power-on a matrix of diodes is scanned to set-up the
controller for the correct options:
D7 selects the correct frequency ranges.
D10 enables the use of Auto tuning as well as manual
tuning.
08 allows the Auto-tuning mode to use the * IF Count
method of searching.
The position of jumpers JP 5 & JP6 fitted to SK9 are used
to disable or enable LW and also whether the AM band
steps are 9 kHz (UK) or 10 kHz (USA).
Z10 provides control signal outputs for the following
functions:
MONO - To defeat the stereo decoder
АМОТЕ - Turns оп the mute circuit when a button is
pressed & during tuning.
FM, MW & LW - Only one output active low at any one
time. Used to switch on specific parts of the RF circuitry as
appropriate.
The micro controller includes a Phase-Locked-Loop (PLL)
circuit which compares the tuner local oscillator signals
(FMIN & AMIN) with a reference frequency. Based on
this information and the required tuned frequency the
controller varies the tuning voltage to the FM and AM
front ends.
The tuning voltages (FMVt & AMVt) have to be filtered
from the PLL by the circuitry around Q7 & Q13.
Display PCB
The display PCB holds the keypad, LCD display, LED
back light module and On-Tune indicator.
The remote control receiver consists of the receiver RX1
and the PIC micro controller, 21, which is used to decode
the incoming remote control codes from RCS format to
Sanyo type commands. This is because the Sanyo micro
controller, Z10, can only respond to Sanyo remote control
commands.
Jumper Settings
Jumper | Option 1 Option 2
ІРІ Best sensitivity Best sound
JP2 Best sensitivity Best sound
JP3 De-emphasis 5005 |De-emphasis
7505
JP4 De-emphasis 5005 |De-emphasis
7505
1Р5 LW & МУ МУ опіу
1Р6 AM spacing 9OKHz |АМ spacing
10KHz
JP7 Less X-MOD Less De-sense
USA / Rest of the World
If the T51 is transferred from or to the USA the
following jumper settings will require changing.
Jumper | Rest of the USA Action
World
JP3 5008 7515 De-emphasis
JP4 5005 7515 De-emphasis
JP6 9KHz 10KHz | AM spacing
2 3 5 6 7 8
LK31 LK41 LK51
LK22 LK32 LK52
LK23 LK33 LK43 LK53
LK24 LK34 LK44 LK54
LK25 LK35 LK45 LK55
LK26 LK36 LK46 LK56
LK27 LK37 LK47 LK57
LK18 LK28 LK38 LK48 LK58
LK19 LK29 LK39 LK49 LK59
LK20 LK30 LK40 LK50 LK60
FM/AM IF Demodulator
189262 1 2.SCH
Microprocessor and PLL
L892C4 1 2.5СН
Stereo decoder and Audio
L892C3 1 2.SCH
DRAWING TITLE
Т51 Tuner
Circuit Diagram
ELI
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Tooling & Fixing Holes
Tooling Holes
FDI PD3
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00 1078 12/09/00| R93 WAS 2208 NOW 1К0 1.2
А & В Cambridge Ltd.
Pembroke Avenue 17/7/00 PRODUCTION RELEASE 1
ERA БЕШЕ DESCRIPTION OF CHANGE ISSUE
4 Fil Date Printed Drawn by:
Cambridge CB5 9PB в. АСЕМОА\00_1078 L892 T51 TUNER\L892_1\L892_1.ddb - here 2-Sep-2000 CL Sheet 1 of 4 DRAWING МО. 1892СТ
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12/09/00 | R93 WAS 2208 NOW 1К0 12
31/7/00 | INITIAL RELEASE
А 8 Н Cambridge Ltd.
Pembroke Avenue
Denny Industrial Centre
Circuit Diagram
Cambridge CBS 9PB g ECO No. JINITIALS| DATE DESCRIPTION OF CHANGE ISSUE
Filename Date Printed Drawn by:
G:\DATA\ECO\ECO AGENDA\00_1078 L892 T51 TUNERIL892 11.892 1.ddb - L892C2| 1 2.95ер-2000 CAH/SJB Sheet 2 of 4 DRAWING МО. L892CT
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T51 DISPLAY BOARD
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PCB1 A & R Cambridge Ltd.
Pembroke Avenue
Denny Industrial Centre
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Т51 Маш Воага 1,892 1.2
Reference | Description Part
Number
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S MF WA 196 10K
S MF МА 820R 196
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S MF WA 196 330R
S MF WA 196 4K7
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T51 Display Board L893 2
Reference | Description
Part
Number
MCD BACKLIGHT L802ML
| MCD BACKLIGHT |
LED GREEN 3.1MM SLR- 3D007
37MG3F
LED GREEN 3.1MM SLR- 3D007
37MG3F
RES MF WA 1% 330R
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NFR25
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38KHZ
10-WAY FFC CONN HORIZ BK8110
SK201 22-WAY FFC С ONN HORIZ 8K8122
SK202 22-WAY FFC С ONN HORIZ 8K8122
TACT SWITCH 2-PIN LOW
PROF 9.5mm ACTUATOR
SW201-
204
SKHVPH
SW205 TACT SWITCH 2-PIN LOW A1504
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SW206 TACT SWITCH 2-PIN LOW А1504
РКОЕ
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210
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ІС SOCKET 18 РІМ 0.3" 85018
РКОЕ 9.5mm АСТОАТОК
SW211- A1504
214 PROF
71 IC CMOS MICRO 5Н16С54
PIC16C54XT/P X
T51 General Assembly Parts List
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T51 General Assembly Parts List
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