Philips FM242, Руководство по обслуживанию

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Service Modes, Error Codes and Fault Finding EN 17 FM242 AA 5.
5.5.2 How to Clear the Error Buffer
The error code buffer is cleared in the following cases:
•
By activation of the 'Reset error buffer' command in the
SAM menu.
• When you transmit the code 062599 with a standard
remote control transmitter.
5.5.3 Error Codes
Table 5-1 Error code overview
Notes:
•
In case of non-intermittent faults, clear the error buffer
before you begin the repair. This to ensure that old error
codes are no longer present.
• If possible, check the entire contents of the error buffer. In
some situations, an error code is only the result of another
error code and not the actual cause (e.g., a fault in the
protection detection circuitry can also lead to a protection).
• In case error 70 occurs, the belonging over-voltage line
cause can be located via measuring. (via measuring all 4
voltages simultaneously with an oscilloscope). Chosen
FM242-workshops will be trained how to do so. (special
document will be generated for this).
5.6 The Blinking LED Procedure
Via this procedure, you can make the contents of the error
buffer visible via the front LED (orange colour).This is
especially useful when there is no picture. When no errors are
present, the LED will stay green.
When the SDM is entered, or when code 062500 is entered
with the remote control, the LED will blink the contents of the
error-buffer.
Error-codes
≥
10 are shown as follows:
1. n long blinks of 750 ms, which is/are an indication of the
decimal digit,
2. a pause of 1.5 s,
3. n short blinks (n = 1-9),
4. when all the error-codes are displayed, the sequence
finishes with a LED blink of 3 s,
5. the sequence starts again.
Example of error buffer: 12 9 6 0 0
After entering SDM:
1.
1 long blink of 750 ms followed by a pause of 1.5 s,
2. 2 short blinks followed by a pause of 3 s,
3. 9 short blinks followed by a pause of 3 s,
4. 6 short blinks followed by a pause of 3 s,
5. 1 long blink of 3 s to finish the sequence,
6. the sequence starts again.
5.7 Protections
You can read the error codes of the error buffer via the service
menu (SAM), the blinking LED procedure, or via ComPair. If a
fault situation is detected an error code will be generated and if
necessary, the set will be put in the protection mode. Blinking
of the red LED at a frequency of 5 Hz indicates the protection
mode.
In some error cases, the microprocessor does not put the set
in the protection mode. The error codes are indicated by an
orange front LED.
To get a quick diagnosis the chassis has three service modes
implemented:
•
The Customer Service Mode (CSM): easy way to read out
the status of the set.
• The Service Default Mode (SDM): start-up of the set in a
predefined way.
• The Service Alignment Mode (SAM): adjustment of the set
via a menu and with the help of test patterns.
Exceptional ‘protection’ situation
There exists one ‘protection’ (due to too high internal set-
temperature), where the set does not switch to ‘protection’-
mode but to Standby-mode. This protection is not logged into
the error-buffer.
When the set becomes too warm, an ‘On Screen Display’-
message will be showed set is going to switch to Standby. After
some time set can be switched on again. (It is very unlikely this
will happen. For that reason this performance has been
accepted).
Error Device Description Item Diagr.
1 TEA6422D Audio switch
(only Enhanced) 7798 SC13
2 MSP3451G Sound proces-
sor 7812 SC14
3 PCF8574-
SCAVIO I/O expander
SCAVIO 7540 SC8
4 PCF8591 AD-DA expand-
er 7530 SC8
5 FS6377 Clock generator 7570 SC9
6 PCF8574-PSU I/O expander
PSU 7370 P3
7 24C16 OTC NVM OTC 7430 SC7
8 24C16 PW NVM PW 7580 SC9
9 SAA7118 Video decoder
(only Enhanced) 7225 SC5
10 AD9887 ADC/TMDS re-
ceiver 7170 SC4
11 SDA9400 De-interlacer
(only Enhanced) 7280 SC5
12 EP1K30QC EPLD processor 7656 SC11
13 PDP I2C error of the
PDP
20 Download comm. Errors during
downloading
21 CSP comm. CSP time-out er-
ror
40 Temperature alarm Detections of
over-tempera-
ture
70 Over voltage Vs, Va, +5V,
+3V3 overvolt-
age Black
box P
71 Vs under voltage Vs under voltage Black
box
P
72 Va under voltage Va under voltage Black
box
P
73 +5V under voltage +5V under volt-
age Black
box P
74 +3V3 under v3V3 under volt-
age
Black
box P
75 DC-PROT Audio amplifier
protection Black
box P
Temperature error
The monitor will switch to standby
automatically.
Please allow cool down.