Philips MCW770 Service Manual page 20

SERVICE TESTPROGRAM
PART 2
TEMPERATURE TEST
(Transformer NTC)
2; button
N
pressed?
Y
Display shows
ADC1 255
ADC 1 input is not relevant
for MCW770.
Press 2; again.
button N
pressed?
Y
Display shows
ADC2 XX
1)
XX = temp. in ˚C
STOP button N
pressed?
1)
When the value exceeds 138˚C, the temperature
of the set is detected as too high and in turn the
set will be switched to Standby mode.
This can also be caused by the Overvoltage Protection
circuit , switching the NTC line to ground.
KEY CODES
KEY KEY CODE
CD1 1
CD2 2
CD3 3
CD4 4
OPEN/CLOSE 5
CD5 6
STANDBY-ON 7
8
SOURCE
5-4
KEY TEST
3
button N
pressed?
Y
Display shows
KEY --
Numbers acc. table1
are indicated as long as a
button is held depressed.
If a button is pressed
on the Remote Control
RC is shown
and the ; flag flashes.
N
STOP button
pressed?
Y
SERVICE PRESET FREQUENCIES
KEY KEY CODE REGION
ALBUM - 4
9
PRESET
ALBUM + 3 1
10
2
PLAY 2;
11
3
4
HOME 12
5
WL PC LINK 13
6
S 7
14
8
T
15
9
10
9 (exit)
16
11
table 1
To toggle frequency grid hold ALBUM+ 3 & HOME buttons depressed while plugging mains cord in.
2)
Display will show either
To enter Service
* To leave Service Testprogram plug mains cord off.
Testprogram hold
2;´ & HOME buttons
* In the main menu the sound settings (volume, ...)
depressed while
and trays work as in normal mode.
plugging mains cord in.
S
stands for Service mode
The display shows.
VXX
stands for Version number
S-VXX of the software used in the
Front (Display) µP.
TUNER TEST ROTARY ENCODER
TEST
N DISC 3 button VOLUME KNOB
pressed? turned ccw?
Y Y
Display shows version
Display shows the
of tuner board for 3s.
actual volume level
EUR
e.g.
VOLUME XX
for 2s.
Service Preset-frequencies
acc. table 2 are copied
to the RAM.
Tuner is normal working
except for the PROGRAM
button. Volume is set
to -20dB.
When a Stereo signal is
received the stereo flag K
will light up.
When RDS data are
received R . D . S will light up.
POWER
N
switched off?
Y
Exit Service Testprogram
EUR EAS OSE
EUROPE USA OVERSEAS
FM/MW FM/AM FM/MW
2) Grid switchable
10-100kHz/9-50kHz
/22 /37 /21
87,5 MHz 65,81 MHz 87,5 MHz
108 MHz 108 MHz 108 MHz
531 kHz 530 kHz 530/531 kHz
1602 kHz 1700 kHz 1700/1602 kHz
558 kHz 560 kHz 560/558 kHz
1494 kHz 1500 kHz 1500/1494 kHz
98/87,5MHz
98 MHz
98MHz 87,5 MHz 87,5/98MHz
table 2
GRID 9 GRID10
or for 2 s.
5-4
COMBI BOARD (I 2 C)
TEST
N VOLUME KNOB N DISC 4 button
turned cw? pressed?
Y Y
Display shows the Display shows
actual volume level
IIC 1
VOLUME XX Sound ICs are set
acc. table 3
for 2s.
N
DISC 4 button
pressed?
Y
Switch to next step acc.
table 3
Last step acc.
N
table 3 reached?
Y
TEST STEPS COMBI BOARD I
STEP SOURCE BASS TREBLE
IIC 1 AUX 0dB 0dB
IIC 2 AUX 0dB 0dB
IIC 3 AUX 0dB 0dB
AUX 0dB 0dB
IIC 4
3)
IIC 5 TUNER 0dB 0dB
3)
IIC 6 PC LINK 0dB 0dB
3)
IIC 7 CD 0dB 0dB
IIC 8 AUX +2dB +3dB
IIC 9 AUX 0dB +3dB
IIC 10 AUX +6dB -6dB
IIC 11 AUX +4dB +1,5dB
IIC 12 AUX 0dB 0dB
IIC 13
IIC 14
IIC 15
IIC 16
IIC 17
exit AUX 0dB 0dB
BASS set to ≤0dB --> BASS ALC=off
table 3
3)
Tuner, WESSLI board respectively the CDC module are not switched on in these steps.
To check the inputs a signal has to be fed directly to Combi board, sockets 1013, 1022
respectively 1015
N
N
STOP button
pressed?
Y
2
C TEST
VOLUME IS MUTE
-20dB
-20dB on
-20dB on
-20dB on
-20dB
-20dB
-20dB
-20dB
0dB
-18dB
-18dB
-20dB
-20dB
MCW770 servtest 2, 170704