Sony MHC-V02 Service Manual page 6

MHC-V02
DAMP Protect Type Description:
X (Error Code)
0 Default no Error
1 Flying capacitor over-voltage error
1. Internal fault detection
2. IC broken
2 Over-current protection
1. Speaker terminal short
2. Speaker impedance too low
3. Speaker broken (internal short)
3 Pll clock error
1. Internal fault detection
2. IC broken
4 Under-voltage protection
1. AVDD, DVDD, VGDC and PVDD supply
not enough or not stable
5 Over-temperature warning
1. Ventilation hole blocking
2. Thermal sheet broken
3. Missing heatsink
4. Heatsink - thermal sheet - PWB contact not
good
6 Over-temperature error
1. Ventilation hole blocking
2. Thermal sheet broken
3. Missing heatsink
4. Heatsink - thermal sheet - PWB contact not
good
7 Pin-to-pin low impedance protection
1. Speaker short
2. Low impedance speaker
8 DC protection
1. DC at speaker output
2. Internal fault detection
3. IC broken
9 More than 1 error found
6
Description
CAPACITOR ELECTRICAL DISCHARGE PROCESSING
When removing the MOTHERBOARD board and SMPS board,
be sure to perform the discharge process by referring below pro-
cedure.
Note: Be sure to discharge using a resistor of 500~800 .
MOTHERBOARD Board (Conductor Side view)
1. Disconnect all the wires and FFC which connected to the
MOTHERBOARD board (avoid touching any component).
2. Unscrew the MOTHERBOARD board.
3. Holding the both edge (avoid touching any component) to lift
up the MOTHERBOARD board.
4. Flip the MOTHERBOARD board to conductor side and per-
form discharge at terminal of C3046 for 20 seconds.
C3046
SMPS Board (Conductor Side view)
1. Disconnect all the wires which connected to the SMPS board
(avoid touching any component).
2. Unscrew the SMPS board.
3. Pulling up the wire (avoid touching any component) to lift up
the SMPS board.
4. Flip the SMPS board to conductor side and perform discharge
at terminal of C6300, C6504 and C6507 for 10 seconds each.
800 /5 W
R
C6300
C6507
C6504
800 /5 W
R
800 /5 W
R
800 /5 W
R
SYS SET