Philips MX3900D Service Manual page 10

SERVICE TEST PROGRAM I
ADC
TEST
N
SEATING
Button pressed?
Y
Y
9
N
Button pressed?
Display shows
"ADC Value"
(Ref Table 1)
Y
Has it reach
"ADC5 Value" ?
N
N
SEATING
Button pressed?
Y
Display shows next
"ADC Value"
(Refer Table 1)
Name
Input line to Remarks
uProcessor IC
ADC1
Key0 Return the value assign for each key button.
ADC2 Key1 Return the value assign for each key button.
ADC3
VU_IN Varies according to the signal dc level
ADC4 MUX_DET The set temperature is measured via this NTC
line, if lower than 69 the set goes into Standby.
ADC5
Options Return the value assign for the different possible
options
Table 1
Note:
ADC Test is used for checking the ADC inputs to the microprocessor. The display
shows an ADC value between 0 and 255 for an input signal between 0 and 5V.
3-1
To start service test program
hold DISC1 & STANDBY-ON
buttons depressed while
plugging in the mains cord*
Display shows the
ROM version
"S-Vyy"
MAIN MENU
QUARTZ
TUNER
TEST TEST
N
TUNING
CLOCK-TIMER
Button pressed?
Button pressed?
Y Y
Display Tuner Version
Display shows
"ccc"
32K
Output at (Front Board)
pin 19 of uP = 2048Hz
N
TUNING
Button pressed?
CLOCK-TIMER
Button pressed?
Y
Service frequencies are
Y
copied to the RAM (see Table 2)
Tuner works normally except:
Display shows
PROGRAM button
12M
Output at (Front Board)
pin 19 of uP = 2,929.6875Hz
N
Disconnect
Mains cord ?
9
Y
Button pressed?
Service Mode left Y
Europe USA Oversea
PRESET "EUR" "USA" "OSE"
87.5MHz
1 87.5MHz 87.5MHz
2 108MHz 108MHz 108MHz
3 531kHz 530kHz 530/531kHz*
1700kHz
4 1602kHz 1700/1602kHz*
5 558kHz 560kHz 560/558kHz*
6 1494kHz 1500kHz 1500/1494kHz*
98MHz
7 87.5MHz 98/87.5MHz*
8 87.5MHz 87.5MHz 87.5MHz
9 87.5MHz 87.5MHz 87.5MHz
87.5MHz
10 87.5MHz 87.5MHz
11 98MHz 87.5MHz 87.5/98MHz*
Note: * Depending on the selected grid frequency (9 or 10kHz).
By holding the "DISC5" and "STANDBY-ON" buttons depressed while switching on the Mains supply, one of the
undermentioned features will be activated:
- the tuning grid frequency is toggled between 9kHz and 10kHz for the Oversea (/21) version.
* Hold till the Display is shown
S refers to Service Mode
V refers to Version
yy refers to Software version number of the uProcessor
(counting up from 01 to 99)
DISPLAY
TEST
N BII N
Button pressed?
Y
Display shows Figure 1
and Standby LED is
Green
BII
N N
Button pressed?
Y
Display shows Figure 2
and Standby LED is
RED
N
9
N
Button pressed?
Y
East Europe East Eur. Extended-band
"EAS" "EAS"
87.5MHz 65.81MHz
108MHz 108MHz
531kHz 74MHz
1602kHz 87.5MHz
558kHz 531kHz
1494kHz 1602kHz
87.5MHz 558kHz
87.5MHz 1494kHz
87.5MHz 98MHz
87.5MHz 70.01MHz
98MHz 65.81MHz
Table 2
3-1
Figure 1
Figure 2
TEST Activated with ACTION
T
EEPROM TEST Some test patterns will be sent to the EEPROM.
"PASS" is displayed if the uProcessor read back
the test patterns correctly, otherwise "FAIL" will be
9 to Exit
displayed.
S
EEPROM FORMAT Load default data. Display shows "NEW" for 1 second.
Caution!
TEST
All presets from the customer will be lost!!
Pressing this button will toggle between the status
AUTO STANDBY SUBW +
"AUTO STANDBY ON" and "AUTO STANDBY OFF".
(Remote Control)
TOGGLE
The status will scroll once across the Display.
ROTARY SOURCE / VOLUME Display shows value for 2 seconds.
Knob Values increases or decreases in steps of 1 until
ENCODER TEST
0 (Min.) or 40 (Max.) is reached.
LEAVE SERVICE Disconnect
mains cord
TEST PROGRAM
5DTC MX.. Range Service Test Program dd wk0302
Various
other Tests