Sony HCD-VR50 / HCD-VR50XR / HCD-VR70 / LBT-VR50 / LBT-VR50R Service Manual ▷ View online
– 5 –
AMS Test Mode
• This mode is used for checking the AMS operations of the tape deck.
JIG
7-819-039-12 Alignment tape, AMS-110A
7-819-039-12 Alignment tape, AMS-110A
Procedure:
1. Press the
1. Press the
1/u button to turn the set ON.
2. Set the tape (AMS-110A).
3. Press the three buttons
3. Press the three buttons
t/CLOCK SET , ENTER , and DISC 3 button simultaneously.
4. “TEST MODE” is displayed on the fluorescent display tube.
5. Press the FUNCTION button and switch the function to the deck with the tape (AMS-110A).
6. Press the CD SYNCHRO button. “AMS CHECK” is displayed on the fluorescent display tube and the tape is rewound.
7. AMS starts in the normal direction. If the AMS count is 2 at shut down, proceed to step 8.
5. Press the FUNCTION button and switch the function to the deck with the tape (AMS-110A).
6. Press the CD SYNCHRO button. “AMS CHECK” is displayed on the fluorescent display tube and the tape is rewound.
7. AMS starts in the normal direction. If the AMS count is 2 at shut down, proceed to step 8.
“NG” is displayed at other times, and the deck stops.
8. AMS starts in the opposite direction. If the AMS count is 2 at shut down again, “OK” is displayed.
“NG” is displayed at other times.
SELF-DIAGNOSIS
This model has the self-diagnosis function for the VIDEO and AUDIO decoder sections.
Immediately after the power on, the self-diagnosis function searches each operation of IC’s around the mechanism control microcomputer
(IC701).
The results can be checked by D502 of the VIDEO board.
Immediately after the power on, the self-diagnosis function searches each operation of IC’s around the mechanism control microcomputer
(IC701).
The results can be checked by D502 of the VIDEO board.
Oscilloscope (Waveform)
Symptom
No error
MPEG decoder (IC505)
error
error
MPEG decoder (IC505)
or
DRAM (IC507) error
or
DRAM (IC507) error
[VIDEO BOARD] (SIDE A)
D502
IC505
100
91
33
64
90
65
1
32
H
L
Light
2 time blinking
H
L
H
L
3 time blinking
– 6 –
SECTION 2
GENERAL
Front Panel
2
3
4
1
7
9
13
14 15
16
17
8
5
6
10 11 12
18
19
20
21 22
23
24
25
25
26
27 28
30
29
31
32 33
34 35
36
37
38 39
41
42
43
40
44
45
46
47
49
50
51
48
54
55
56
57
58
52
53
59
60
61
62
63
64
65
66
67
69
70
68
71
72
73
74
75
76
77
78
– 7 –
LOCATION OF PARTS AND CONTROLS
1
1/u (Power) button and indicator
2
POWER SAVE/DEMO (STANDBY)
button
button
3
DISPLAY button
4
SPECTRUM ANALYZER button
5
Display window
6
GEQ control button
7
SYNC BASS button
8
SYNC EQ button
9
Remote sensor
10
TUNING MODE button
11
STEREO/MONO button
12
ENTER/NEXT button and indicator
13
TUNER MEMORY button
14
TUNER/BAND button and indicator
15
TUNING - button
16
TUNING + button
17
FUNCTION button
18
VOLUME knob
19
PHONES jack
20
MIC 1 jack
21
ECHO LEVEL knob
22
MIC LEVEL knob
23
MIC 2 jack
24
GROOVE button and indicator
25
SUPER WOOFER button and indicator
26
MODE button
27
ª (B Deck) button and indicator
28
· (B Deck) button and indicator
29
p (B Deck) button
30
0 (B Deck) button
31
) (B Deck) button
32
P (B Deck) button and indicator
33
r REC (B Deck) button and indicator
34
HI-SPEED DUB button
35
CD SYNCHRO button
36
PLAY MODE button
37
REPEAT button
38
0 (CD) button
39
) (CD) button
40
·P (CD) button and indicator
41
p (CD) button
42
DISK SKIP button
43
= AMS + knob
44
VIDEO2 INPUT jacks
45
EDIT button
46
NON-STOP button and indicator
47
LOOP button
48
FLASH button
49
PREV button
50
NEXT button
51
RETURN button
52
DISC 5 button
53
DISC 4 button
54
DISC 3 button
55
DISC 2 button
56
DISC 1 button
57
SELECT button
58
ACTIVE button
59
DOLBY NR button
60
DIRECTION button
61
) (A Deck) button
62
0 (A Deck) button
63
p (A Deck) button
64
· (A Deck) button and indicator
65
ª (A Deck) button and indicator
66
KEY CONTROL
n button and indicator
67
KEY CONTROL
˜ button and indicator
68
KARAOKE PON/MPX button
69
SURROUND button and indicator
70
EFFECT button and indicator
71
ENTER button and indicator
72
GEQ CONTROL button
73
P. FILE MEMORY button
74
Equalizer indicators
75
t/CLOCK SET button
76
SLEEP button
77
REC button and indicator
78
DAILY button and indicator
• AMS is the abbreviation for Automatic
Music Sensor.
This section is extracted from
instruction manual.
instruction manual.
– 8 –
SECTION 3
DISASSEMBLY
Note:
Follow the disassembly procedure in the numerical order given.
3-1. FRONT PANEL
3-2. MAIN BOARD
1
Three flat type wires
(CN303,CN304,CN431)
2
Connector (CN702)
3
Connector (CN452)
4
Connector (CN802)
7
Front panel
5
Screw (BVTP 3x8)
0
Screw (BVTP 3x8)
!¡
Video board
!¢
Connector (CN301)
!∞
Bracket (VCD)
!™
Flat type wire (CN501)
!§
Bracket (CHASSIS)
!£
Flat type wire (CN503)
9
Three screws
(BVTP 3x8)
8
Screw (BVTP 3x8)
6
Four screw (BVTP 3x8)
4
Connector (CN412)
5
Flat type wire (CN411)
1
Flat type wire (CN1)
3
Tuner unit
2
Two screws (BVTP 3x8)
7
Seven screws (BVTP 3x8)
!¡
Fan motor
!™
Power cord
!£
Back panel
8
Five screws (BVTP 3x8)
6
Connector (CN903)
!∞
Main board
!¢
Two screws (BVTP 3x8)
0
Two screws (BVTP 3x8)
(HCD-VR70)
0
Two screws (BVTP 3x8)
(HCD-VR50)
9
Three screws (BVTP 3x8)
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