Read Sony MHC-V7D Service Manual online
MHC-V7D
21
[HISTORY MODE]
This mode is used to check important data stored in the system
when PROTECTOR happen.
This mode is used to check important data stored in the system
when PROTECTOR happen.
Procedure:
1. During demo mode, press [] button and [+] button for 5
seconds to mode into history mode.
2. Press the [TUNING + >] button or [TUNING ‒ .] button
to check history data stored.
To release from History Mode.
To release from this mode, press [
To release from this mode, press [
\/1
] button.
Protect Type Description:
Error Code
Description
01
The over current condition to MOSFET occurs
by defect of MOSFET or defect of PS output
line.
or
Unusual heat up of MOSFET by improper
assembly of heat sink, destruction of MOSFET
etc.
by defect of MOSFET or defect of PS output
line.
or
Unusual heat up of MOSFET by improper
assembly of heat sink, destruction of MOSFET
etc.
02
Defect of thermistor IC or charging circuit used
by SPM (Sound Pressure Management) system.
by SPM (Sound Pressure Management) system.
03
Defect of power supply circuit to AMP. There
is possibility of unusual power supply of any of
the AMP IC or Pre-amplifi er.
is possibility of unusual power supply of any of
the AMP IC or Pre-amplifi er.
04
DC appears in SP terminal by defect of AMP
IC and MOSFET
IC and MOSFET
06
Defect of DC FAN and DC FAN driver circuit
If speaker does not have output even if the set status is not in
PROTECT mode, the following defect might be possible:
PROTECT mode, the following defect might be possible:
Defects
Possible cause
RESET defect
Reset signal status from micom is not ‘H’.
Display on fl uorescent indicator tube
Description
P
C
O
U
N
T
※
※
No of time protector happen (0 ~ 99)
P
T
※
※
※
※
Refer to protect type description
1
*h
*h
*h
*h
*h.
*m
*m
Single Power On Time until protector happened (0~99999 hours,
0~99Min)
0~99Min)
2
*h
*h
*h
*h
*h.
*m
*m
Total Power On Time [ no consider protector happen ] (0~99999 hours,
0~99Min)
0~99Min)
F
※
※
※
※
※
※
Input Function during protector happened
V
O
L
※
※
※
Volume setting (MIN / 1 - 50 / MAX)
B
A
S
S
※
※
※
MEGA BASS setting (OFF / ON)
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