Philips fa 920 service manual

Page 2

SERVICE TEST PROGRAM

Processor Test

The test can be called up by pressing the keys Loudness
and mute at te same time when te amplifier is switched
on.The following lamps and leds will now be lit. Step A
(fig 1)

When any key is pressed the following lamps and leds
will now lit. Step B (fig 1) Press again a key to step F
and check every step. (fig 1)

When a key is pressed after step F the volume knob
turns for about 4 seconds right and 4 seconds left After
the volume controle check a eeprom check is started.
When after 0.2 seconds the magic touch is used to
wake up the amplifier,the amplifier will come up with
setting G (fig 1)

When setting G is wrong check eepromll

Steps A B C D E F G

Indication Leds
CD off off off off off on off
DCC off off off off on off off
TV/AUX off off off on off off off
TUNER off off on off off off off
PHONE off on off off off off off
TAPE on off off off off off on

Source Leds
St/BY on off on off on off off
Speak.A off on off on off on on
Speak.B on off on off on off off
Auto sel off on off on off on on
Sour.Dir. on off on off on off off
Loudness off on off on off on on
Mute on off on off on off off

Quiescent Current

imi [7: as
SK.... \ i I 3 K, o o
SIGNAL T0 VOLUME ADJUST
SW'TCH OSlLLOSCOPE 3433352
L ch 7; if A L ch. 7 2
Fl 3285 W
STAND - BY 1 ,2
i R ch.
Fl 3286
a _ l 7

Check for good thermal contact between power
transistor and heatsink.

Mains Voltage 220V /00 240V [05 5%

Ambient themperature :201 5° and heatsink must
be atambient temperature.

Set volume position to minimum.

- Disconnect speakers or place the set on stand-by
posnion.

~ Trimpotmeter in clock wize position.

, The adjustment must be finished for both channels
ZOsec after power on