DOWNLOAD Sony NW-MS11 Service Manual ↓ Size: 1.82 MB | Pages: 44 in PDF or view online for FREE

Model
NW-MS11
Pages
44
Size
1.82 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
nw-ms11.pdf
Date

Sony NW-MS11 Service Manual ▷ View online

10
NW-MS11
SECTION  4
TEST  MODE
[Preparation]
Checking consumed electric current is one of the items to check. Connect an ammeter before setting the test mode.
(Refer to the following figure)
[Setting the Test Mode]
There are following two methods of entering the test mode.
Method 1:
Short the short lands (SL0120) on the MAIN board with a solder bridge, then turn on the power.
Method 2:
Turn on the power with the 
[HOLD]
 switch OFF. If the set is left as it is, the LCD display becomes on, and after for a while, it changes into
the sleep status (LCD off). Before the status of the display changes into the sleep status, turn ON the 
[HOLD]
 switch and press 
Hs
t
[MEGA BASS]
 
t
Hs
[VOLUME--]
 
t
Hs
[VOLUME+]
 keys in this order.
[Releasing the Test Mode]
There are following two methods of releasing the test mode.
In case of enter the test mode with the method 1:
Turn off the power and open the solder bridge on the short lands (SL0120) on the MAIN board.
In case of enter the test mode with the method 2:
Turn off the power.
R6901
R6902
C8004
C8509
R6903
R5001
R5003
C8008
R6018
R6027
R6028
R6035
R6037
C8016
C8014
C
R5002
R9015
C9007
R8103
R9019
R8102
R8607
R8104
R8608
R8105
R8110
C8006
1
L9007
IC8000
IC5000
X8000
56
43
SL0120
120 119 117 113 109 108 105 102 99
96 93
1
118 116 114 110 107 104 101 98
95 92
3
2 115 112 111 116 103 100 97
94 91
5
6
4
82
9
8
7
79
12
11 10
76
15
14 13
73
18
17 16
70
20
21 19
67
24
23 22
66
25
26 27
34
37
40 43 46
49
52 61
24
28 32
35
38
41 45 47
50
53 55
30
31 33
36
39
42 44 48
51
54 56
17
25
33
41
18
26
34
42
19
27
35
43
20
28
36
44
21
29
37
45
22
30
38
46
23
31
39
47
24
32
40
48
– MAIN BOARD (Conductor Side) –
battery terminal (+)
battery terminal 
(–)
SL0120
+
ammeter
1.23Vdc
+
regulated dc
power supply
11
NW-MS11
[Flow Chart of Operations in the Test Mode]
[Items to Check in the Test Mode]
1. ROM/RAM Self-check
After entering the test mode, ROM/RAM self-check is performed automatically in the first place. By entering the test mode with key input,
however, no RAM check is performed.
1
Result of the ROM/RAM check is OK:
The LCD back light turns on, and version and destination is displayed automatically.
2
Result of the ROM check is NG:
“BAD ROM” is displayed on the LCD, and the LCD back light keeps blinking.
3
Result of the RAM check is NG:
Nothing is displayed on the LCD, and the LCD back light keeps blinking
2. Display of Version and Destination
Version and destination are displayed as follows.
Every time the 
[DISPLAY]
 key is pressed, the display changes as “version and destination 
t LCD all lit t LCD all off t version and
destination...”.
Also, pressing the 
[VOLUME+]
 key changes the mode to writing destination, and if pressing the 
[VOLUME--]
 key, the unit goes into the
sleep mode.
Enter the test mode
1. ROM/RAM Self-check
2. Display of version
and destination
3. Writing destination
(Checking voltage and 
consumed electric current)
4. Checking the rated
voltage
5. Checking the LOW BATT
 voltage
6. USB self-check
7. RTC self-check
8. Sleep mode
(Checking consumed electric current)
Waking up with the normal mode
(Waking up with the test mode, if 
the short lands (SL0120) have 
been short)
[DISPLAY]
 key
[DISPLAY]
 key
[DISPLAY]
 key
[MENU]
 key
[MENU]
 key
[MENU]
 key
[MENU]
 key
[MENU]
 key
[VOLUME+]
 key
[VOLUME--]
 key
LCD all off
LCD all lit
any key
v0.09.05JP
display example
12
NW-MS11
3. Writing Destination (Checking Voltage and Consumed Electric Current)
After entering this mode, display of version and destination blinks. (The LCD back light turns off)
3-1. Checking voltage and consumed electric current
Note:
Perform checking voltage and consumed electric current with the LCD back light off.
Specified value :
VDDCORE voltage
: 1.8 to 2.0 V (voltage between TP9002 (VDDCORE) and TP (GND))
VDDIO2 voltage
: 2.7 to 2.9 V (voltage between TP9003 (VDDIO2) and TP (GND))
Consumed electric current : below 200 mA
Connecting Location:
3-2. Writing destination
Note:
When the displayed destination is correct, writing destination is no needed. But when the EEPROM check is performed, leave the display as it is and
press the 
[DISPLAY]
 key to perform this check.
After replacing the EEPROM, make it sure to write destination.
Every time the 
[MEGA BASS]
 key is pressed, the display changes as 
t “JP t US t EU t X t JP t...”.
Select the destination*, and press the 
[DISPLAY]
 key to fix. Then the LCD display changes from blinking to being on. Also at the same
time, checking destination written on the EEPROM is performed, and when the result is OK, the LCD back light turns on, and if not, starts
blinking.
*) JP
: Japanese model
EU
: AEP, UK, E, Hong Kong, Korean models
US
: US model
X
: French model
4. Checking the Rated Voltage
Note:
Before entering this mode, check that the input voltage is the specified value (1.23 V).
Press the 
[MENU]
 key after “3-2. Writing Destination” to enter this mode. The check is started automatically.
When the result is OK, “1. HLFBT >OK” is displayed on the LCD. And if the result is NG, “1. HLFBT >NG” is displayed.
5. Checking LOW BATT Voltage
Note:
Before entering this mode, adjust the input voltage to the LOW BATT voltage value (0.95 V).
Press the 
[MENU]
 key after “4. Checking the rated voltage” to enter this mode. The check is started automatically.
When the result is OK, “2. LOWBT >OK” is displayed on the LCD. And if the result is NG, “2. LOWBT >NG” is displayed.
Press the 
[MENU]
 key to go to the next USB self-check.
TP9003
(VDDIO2)
IC8000
IC5000
TP9002
(VDDCORE)
TP (GND)
– MAIN BOARD (Conductor Side) –
1.HLFBT >
display
2.LOWBT >
display
13
NW-MS11
6. USB Self-check
The indication is displayed as below after entering this mode.
This mode is not used in servicing.
Press the 
[MENU]
 key to go to the next RTC self-check.
7. RTC Self-check
The indication is displayed as below after entering this mode.
The check on writing/reading real time clock is performed automatically and when the result is OK, “4. RTC >OK” is displayed on the
LCD and LCD back light turns on. If the result is NG, “4. RTC >NG” is displayed and the LCD back light blinks.
Press the 
[MENU]
 key to go back to “2. Display of Version and Destination”.
8. Sleep Mode (Checking Consumed Electric Current)
When the 
[VOLUME--]
 key is pressed at “2. Display of Version and Destination”, the unit goes into sleep mode.
Once entering this mode, the LCD turns off and the unit goes into the sleep (standby) status. After being into the sleep status, check that
consumed electric current is within the specified value.
Specified value : below 1 mA
The unit is waked up with normal mode with pressing any key. If the short lands (SL0120)) has been short, however, waked up and enters
this test mode again.
3.USB >
display
4.RTC >
display
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