HCD-EX660Z, HCD-EX880Z, HCD-EX990Z, MHC-EX660, MHC-EX880, MHC-EX990 - Sony Audio Service Manual (repair manual). Page 13

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HCD-EX660Z/EX880Z/EX990Z
13
SECTION  3
TEST  MODE

COLD  RESET
The cold reset clears all data including preset data stored in the 
memory to initial conditions. Execute this mode when returning 
the set to the customer.
Procedure
:*
1.  In standby status, press the [
?/1
] button to turn on the system.
2.  Press three buttons of [
x
], [OPTIONS] and [
?/1
] simultaneously.
3.  When “RESET” appears, the set enters standby status.

PANEL  TEST  MODE
This mode is used to check the liquid crystal display, keys, [VOLUME]
knob, model, destination and software version.

Enter The Panel Test Mode
Procedure:
1.  In standby status, press the [
?/1
] button to turn the power on.
2.  Press three buttons of [
x
], [-] and [
?/1
] simultaneously.
3.  All LEDs and segments of liquid crystal display will light up.

Version Check
Procedure:
1.  In Panel Test Mode, press the [FUNCTION] button.
2.  On the liquid crystal display panel, date and version are 
displayed alternately.
3.  From this status, press the [EQ] button, the destination and 
model name are displayed alternately.
4.  To release from this mode, press three buttons of [
x
], [-] 
and [
?/1
] simultaneously.

Key & Encoder Test check
Procedure:
1.  In Panel test mode, press the [ENTER] button.
2.  The message “KEY0 0 0” displayed. Whenever any buttons 
are pressed, the value is change.
3.  To release from this mode, press three buttons of [
x
], [-] 
and [
?/1
] simultaneously.

COMMON  TEST  MODE
This mode is used to check operations of the Amplifi er section.
Procedure:
1.  To enter Common Test Mode, press three buttons of [FUNCTION],
[OPTIONS] and [
?/1
] simultaneously.
2.  “COMMON” appears on the liquid crystal display panel. The 
volume is changed to VOLUME MIN.
 Check 
of 
Amplifi er
 1. 
Press the [EQ] button repeatedly until a message “EQ MAX”
appears on the liquid crystal display panel. EQ increases 
to its maximum.
 2. 
Press the [EQ] button repeatedly until a message “EQ MIN”
appears on the liquid crystal display panel. EQ decreases 
to its minimum.
 3. 
Press the [EQ] button repeatedly until a message “EQ FLAT”
appears on the liquid crystal display panel. EQ is set to fl at.
  4.  When the [VOLUME] knob is turned clockwise even 
slightly, the message “VOL 29” (for EX660Z and EX880Z) 
or “VOL 31” (for EX990Z) appears on the liquid crystal 
display panel. Sound is set to Standard Volume Position 
(SVP).
  5.  When the [VOLUME] knob is turned clockwise even 
slightly, the message “VOL MAX” appears on the liquid 
crystal display panel. Sound is set to volume maximum.
 
6.  When the [VOLUME] knob is turned counterclockwise 
even slightly, the message “VOL MIN” appears on the 
liquid crystal display panel. Sound is set to volume mini-
mum.
3.  To release from this mode, press the [
?/1
] button.
4.  The cold reset is enforced at the same time.

CD  THEFT  PREVENTION
This mode let you lock the disc tray. When this mode is activated,
the disc tray will not open when the [
Z
] button is pressed. The
message “LOCKED” will be displayed on the liquid crystal 
display panel. This mode only applied when there is disc on the 
tray.
Procedure:
1.  In standby status, press the [
?/1
] button to turn the power on.
2.  Press the [FUNCTION] button to select CD function.
3.  Press the [
x
] and [
Z
] button simultaneously and hold down 
for around 5 seconds until “LOCKED” or “UNLOCKED” is 
displayed on the liquid crystal display panel.

TUNER  STEP  CHANGE
The step interval of AM channels can be toggled between 9 kHz 
and 10 kHz. This mode is not available for Saudi Arabian, Euro-
pean and Russian models.
Procedure:
1.  Press the [
?/1
] button to turn on the system.
2.  Press the [FUNCTION] button repeatedly to select the “AM”.
3.  Press the [
?/1
] button to turn off the system.
4.  Press the [DISPLAY] button on the remote control to enter 
clock mode or demo mode, then press the [TUNING + 
M
 
L
]
and [
?/1
] button simultaneously.
5.  The system turns on automatically. The message “9K STEP” 
or “10K STEP” appears on the liquid crystal display panel and 
thus the channel step is changed.

PROTECT  KIND  CHECK  TEST  MODE
This mode is used to check type of protect occurred during 
protector on.
Procedure:
1.  During protection on, LCD will toggle between “PROTECT 
EXX” message & protector kind message display.
Indication of display tube
Breakdown of defect
PROTECT E01
Defect of AMP circuit & SMPS 
overload.
PROTECT E02
Defect of fan, output speaker, 
7V regulator & 9V regulator 
circuit.
OVER CURRENT
Defect of power supply circuit 
to 5V regulator (USB).

1.  Defect of AMP circuit
1-1.  If PROTECT mode is in “PROTECT ERROR 01”,
The following defect can be considered.
The kind of defect
The cause is considered
OTP (Over Temperature 
Protection)
Unusual heat of MOSFET by 
assemble defect of heatsink 
and destruction of MOSFET 
etc..
Unusual output of Power 
mount
The power mount is unusual 
output. Please refer the point 
of power mount.
Display
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