Arcam T51 Manuale di servizio - Pagina 4
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AMUTE - Turns on 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, Z1, which is used to decode
the incoming remote control codes from RC5 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
JP1
Best sensitivity
JP2
Best sensitivity
JP3
De-emphasis 50uS
JP4
De-emphasis 50uS
JP5
LW & MW
JP6
AM spacing 9KHz
JP7
Less X-MOD
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
World
JP3
50uS
JP4
50uS
JP6
9KHz
Option 2
Best sound
Best sound
De-emphasis
75uS
De-emphasis
75uS
MW only
AM spacing
10KHz
Less De-sense
USA
Action
75uS
De-emphasis
75uS
De-emphasis
10KHz
AM spacing