Test Mode - Sony Walkman MZ-R900 Service Manual

MZ-R900
Outline
• This set provides the Overall adjustment mode that allows CD
and MO discs to be automatically adjusted when in the test mode.
In this overall adjustment mode, the disc is discriminate between
CD and MO, and each adjustment is automatically executed in
order. If a fault is found, the system displays its location. Also,
the manual mode allows each individual adjustment to be auto-
matically adjusted.
• Operation in the test mode is performed with the set. A key
having no particular description in the text, indicates a set key.
• For the LCD display, the LCD on the remote commander is
shown, but the contents of LCD display on the set are same.
Setting Method of Test Mode
There are two different methods to set the test mode:
1 Short SL801 (TEST) on the MAIN board with a solder bridge
(connect pin 3 of IC801 to the ground). Then, turn on the
power.
– MAIN Board (Conductor Side) –
2 In the normal mode, turn on the
[VOL --]
ing the key press the following order:
t t t
> > .
t t t
. > .
12
SECTION 4

TEST MODE

3 79 77 70 81 60 58
0 74 67 65 63 62 57 61
31 133 135 137 68 55 54 56
4 76 73 66 59 49 53
+
C830
44 50 47
35 36 45
L801
31 30 51
113 24 42
25 20 26
IC801
28 16 40
23 17 38
21 15 34
27 8 22
96 95 18
SL801
19 4 9
29 2 7
(TEST)
6 1 3
48 10 5
241 12 11
[HOLD]
switch. While press-
t t
. >
t
X X
Operation in Setting the Test Mode
• When the test mode becomes active, first the display check mode
is selected.
• Other mode can be selected from the display check mode.
• When the test mode is set, the LCD repeats the following dis-
play.
Remote commander LCD display
888
All lit
All off
Microcomputer
003 V1.000
version
display
Destination code
002 : Except US, Canadian models
003 : US, Canadian models
When the key is pressed and hold down, the display at that
X
time is held so that display can be checked.
Caution: On the set having the microcomputer version 1.000,
some adjusted values were set in the manual mode at
the shipment, but these data will be cleared when the
NV is reset. Therefore, on the set having the micro-
computer version 1.000, change the adjusted values
following the Change of Adjusted Values immediately
after the NV was reset (see page 17).
Releasing the Test Mode
For test mode set with the method 1:
Turn off the power and open the solder bridge on SL801 (TEST)
on the MAIN board.
Note: Remove the solders completely. Remaining could be shorted with
the chassis, etc.
For test mode set with the method 2:
Turn off the power.
Note: If electrical adjustment (see page 17) has not been finished com-
pletely, always start in the test mode. (The set cannot start in nor-
mal mode)
BASS12