Sony PFM-42B1 Service Manual page 4

6. Detection of at the left side of panel temperature
(Name of this function on the service menu :
TEMPERATURE - PANEL SIDE)
Occurrence of abnormality and fault is judged solely
from the internal temperature of the PFM-42B1/B1E.
Measurement of the ambient temperature aims mainly
at the confirmation of the operating environment.
Therefore, there is no chance to indicate this warning
message.
Warning of high temperature at 85 °C or higher.
7. Detection of fan stop and that of drive circuit failure.
. Detection if fan is stopped or not.
(Name of this function on the service menu : FAN)
Status of the respective fans are displayed as OK or
NG on the service menu STATUS.
FAN
DRIVE CIRCUIT
• B BOARD
• P/S BLOCK TOP
• P/S BLOCK MID
• P/S BLOCK LOW L
• P/S BLOCK LOW R
• DD CON SIDE
• I/O BLOCK SIDE
. Detection of fan drive circuit failure
(Name of this function on the service menu :
FAN - DRIVE CIRCUIT)
The warning when the fan drive data is 6 V or more
and the actual drive voltage is 2 V or less :
8. Detection of temperature rise in the power supply block.
(Name of this function on the service menu :
TEMPERATURE - P/S INTERNAL)
Warning of high temperature when temperature of the
heat sink for main converter inside the power supply
unit exceeds the allowable limit :
WARNING at 90 °C
Shut-down at 95 °C
9. Shut down when the 5 V for internal digital circuit has
abnormality.
(Name of this function on the service menu :
POWER SUPPLY - DIGITAL 5V)
The voltage that is input to pin-62 of the system
controller (IC252) is detected.
Shut down when there is no input voltage :
PFM-42B1, PFM-42B1E
: OK
: OK
: OK
: OK
: OK
: OK
: OK
: OK
warning
warning
10. Detection of failure of the EEPROM.
(Name of this function on the service menu : OTHERS)
Warning when communication with EEPROM cannot
be performed normally.
. EEPROM ID code error :
. EEPROM data write error :
. EEPROM data read error :
. EEPROM failure :
11. Detection of abnormality in communication with scan
converter.
(Name of this function on the service menu : OTHERS)
Warning when communication with scan converter
cannot be performed normally.
12. Detection of failure in the ON/OFF control of power
supply.
(Name of this function on the service menu : Nil)
When the digital 5 V power does not decrease even in
the STBY state, the machine enters the POWER ON
state automatically.
13. Detection of decreased voltage of the backup power
supply for watch and detection of abnormality of
oscillator.
(Name of this function on the service menu : OTHERS)
Normal/abnormal is detected from the register value
inside the watch IC.
. Initialization of time due to abnormal register value :
. Warning of low voltage of backup power supply :
. Warning that crystal oscillator for watch has stopped :
14. Detection of PDP failure.
(Name of this function on the service menu : Nil)
PDP is suspected to be defective when DIGITAL 5 V
is normal among the voltages (VS, VA, DIGITAL 5
V) required to drive PDP while both VS and VA are
not inputted.
When all the following conditions are satisfied, the
machine enters once to the STANDBY mode then turn
the main power back on again.
1) DC 180 V power is 40 V or less.
2) DC 70 V power is 20 V or less.
3) DIGITAL 5 V is normal.
The above-described operation is repeated three times.
If the above three conditions are still satisfied, the PDP
is judged to be faulty and the main power is shut
down.
EEP ROM ID
EEP ROM SAVE
EEP ROM LOAD
EEP ROM ACK
PW164ACK
RTC INITIALIZE
RTC BATTERY
RTC XTAL
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