Sony PFM-42B2, Service Manual, Page: 54 / 138

3-4
PFM-42B2/42B2E
5. 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.
.
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 :
warning
6. 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
WARNING at 90
°
C
Shut-down at 95
°
C
7. 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-95 of the system
controller (IC509) on the B board is detected.
Shut down when there is no input voltage :
8. 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 : EEP ROM ID
.
EEPROM data write error : EEP ROM SAVE
.
EEPROM data read error : EEP ROM LOAD
.
EEPROM failure : EEP ROM ACK
9. 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.
PW164ACK
10. 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.
11. 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 :
RTC INITIALIZE
.
Warning of low voltage of backup power supply :
RTC BATTERY
.
Warning that crystal oscillator for watch has stopped :
RTC XTAL
12. The trouble judgment PDP and power supply board In
the PDP driving voltages Vs,Va,Vcc and Vpr2, If Vcc
and Vpr2 are normal and the power supply control
signals PFCGO, VCEGO,VSAGO are HIGH, In case
Vs and Va are not input normally, the PDP unit or
power supply board is defective.
FAN
DRIVE CIRCUIT
• B BOARD
• I/O BLOCK SIDE
• PS BLOCK (I/O)
• PS BLOCK (XSUS)
• XSUS SIDE : OK
: OK
: OK
: OK
: OK
: OK