Test Mode; Troubleshooting - Sony GTK-XB90 Service Manual

2020/08/20 22:42:53 (GMT+09:00)
Buttons and indicators position:
STAMINA FUNCTION USB AUDIO IN
– Top view –
CHARGE
GTK-XB90
SECTION 3

TEST MODE

SOFTWARE VERSION
It can confi rm the software version.
L R ADD
Procedure:
1. Press the [ ] button to turn the power on.
1
2. Press the [FUNCTION] button to select the AUDIO IN function.
3. Press two buttons of the [u] and [ADD] simultaneously for
5 seconds.
4. LEDs indicating the each software version fl ash simultane-
ously, and check the version by the fl ashing frequency.
Example:
• When the MCU version is "v12"
The [ADD L] LED fl ashes 1 time, the [ADD R] LED fl ashes 2
times.
(The [ADD L] LED and the [ADD R] LED flash simultaneously)
Flash
(1 time)
• When the MPEG version is "v14"
The [STAMINA] LED fl ashes 1 time, the [CHARGE] LED
fl ashes 4 times.
(The [STAMINA] LED and the [CHARGE] LED flash simul-
taneously)
STAMINA
Flash
(1 time)
• When the BT version is "v062"
The [AUDIO IN] LED does not fl ash (not light), the [ ] LED
fl ashes 6 times, the [USB] LED fl ashes 2 times.
(The [ ] LED and the [USB] LED flash simultaneously)
Flash
(6 time)
FACTORY SETTING
It can reset all settings and clear the Bluetooth linked list. Execute
this mode before returning the this unit to the customer.
Procedure:
1. Press the [ ] button to turn the power on.
1
2. Press two buttons of the [FUNCTION] and [–] simultaneously
for 5 seconds.
3. The [ ], [USB], [AUDIO IN] and [
and the power turns off automatically.
USB
Flash
(2 times)
1. Flowchart
Power does not turn on.
Ref. No. D9 on the MAIN board
is damaged (short circuit).
Replace the Ref. No. D9 on the
MAIN board with a new part.
The following voltage is 5V.
MAIN board:
Between cathode side of Ref.
L R ADD
No. ZD4 and GND
Flash
(2 times)
2. Checking procedure
Procedure:
1. Check that the power does not turn on even if press the [1]
FUNCTION
button, and disconnect the power supply.
2. Check the condition of part for diode (Ref. No. D9) of the
CHARGE MAIN board.
Note 1: Bond is applied to the diode (Ref. No. D9). Refer to "4. Bond
3. If the diode (Ref. No. D9) is damaged such as short circuit,
prepare a new diode.
Note 2: If the diode (Ref. No. D9) is normal, replace the MAIN board
Flash
(4 times)
4. Replace the diode (Ref. No. D9) with a new part.
Note 3: Notice to the direction of mount the part and replace it. (Refer to
5. Input the power supply, measure the voltage between the cath-
ode side of the zener diode (Ref. No. ZD4) and GND with a
tester, and check that the voltage of 5 V is outputted.
Note 4: If a voltage of 5 V is not output, replace the MAIN board with a
USB AUDIO IN
6. Check that the power is turn on by press the [1] button, and it
is complete.
Flash Not flash
(2 times) (Not light)
3. Parts position
– MAIN Board (Component Side) –
] LEDs fl ashes 2 times,
1
AUDIO IN
CHARGE
Flash
(2 times)
21 21
SECTION 4

TROUBLESHOOTING

Yes
No
Yes
Yes
No
Replace the MAIN board
with a new board.
Yes
Yes
Completion.
removal of diode (Ref. No. D9)" on the right, cut off a fraction of
the bond and check it.
with a new board.
"3. Parts position" below)
new board.
D9
ZD4
Cathode
Cathode
Anode
Anode
GTK-XB90
Ver. 1.1
4. Bond removal of diode (Ref. No. D9)
Bond is applied to the diode (Ref. No. D9).
This bond is applied to fi x the electrolytic capacitor (Ref. No. CE4
and CE15), so it is no problem to remove the bond on the diode
(Ref. No. D9).
When checking or replacing the diode (Ref. No. D9), refer to the
fi gure below and remove the bond.
Note: Remove the bond so as not to aff ect the fi xation of the electrolytic
capacitor (Ref. No. CE4 and CE15).
• Bond removal
Cut off the bond along the outer shape of the diode (Ref. No. D9)
with a cutter etc.
Note: Check the electrolytic capacitor (Ref. No. CE4 and CE15) is fi rmly
fi xed.
D9 D9
CE4 CE4
CE15 CE15
Bond Bond
• Replace the diode (Ref. No. D9)
After removing the bond on the diode (Ref. No. D9), remove the
solder of the diode and replace with a new part.
Note 1: Check the electrolytic capacitor (Ref. No. CE4 and CE15) is fi rm-
ly fi xed.
Note 2: There is no need to apply the bond after mounting the new diode.
Note 3: Notice to the direction of mount the part and replace it. (Refer to
"3. Parts position" on the left)
Bond
SYS SET