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5-3
5-4.
SYSTEM CONTR
OL
–
A
UDIO BLOCK INTERF
A
CE (MA-366 BO
ARD IC101)
STOP/
TAPE
TAPE
PB
•
REC
•
Signal
Pin No.
I/O
FF/
LOADING
UNLOADING
PB
PAUSE
SLOW
×
2
CUE
REVIEW
REC
PAUSE
REW
AF ENV
MA-366
I
AF RF envelope signal input terminal for automatic tracking.
IC101
qs
A MUTE
MA-366
O
Hi-Z
Hi-Z
Hi-Z
Hi-Z
H
H
H
H
H
L
L
IIC101
ql
(O.D)
AF REC P
MA-366
O
L
L
L
LLL
LL
L
H
L
IC101
qj
AF SWP
MA-366
O
*
1
*
1
*
1
*
1
*
1
*
1
*
1
*
1
*
1
*
1
*
1
IC101
wd
∗
1.
30 Hz 50% duty pulse appro
x.
5 msec dela
y
ed from RF SW P
.
5-4
5-4 E
5-5.
SER
V
O/SYSTEM CONTR
OL MICR
OPR
OCESSOR PIN FUNCTION (MA-366 BO
ARD IC101)
Pin No.
Pin Name
I/O
Function
1
REC PRF
I
E
rasing protection tab
. cassette in detection
2
D
GND
–
Digital circuit g
round
3
KEY 1
I
Function k
e
y analog v
o
ltage input 1
4
KEY 2
I
Function k
e
y analog v
o
ltage input 2
5
KEY 3
I
Function k
e
y analog v
o
ltage input 3
6
KEY 4
I
Function k
e
y analog v
o
ltage input 4
7
S
SENS
I
Supply end sensor signal input
8
V
SWP ADJ
I
V
ideo s
w
itching position adjustment
9
A
SWP ADJ
I
A
udio s
w
itching position adjustment
10
MESECAM DET
I
MESECAM detect signal input
“H
” :
MESECAM
11
V ENV
I
V
ideo pla
ybac
k signal en
v
e
lope
12
A ENV
I
H
iFi audio pla
ybac
k signal en
v
e
lope
13
T SENS
I
T
ak
e-up end sensor signal input
14
NC
–
Not used
15
AN +5V
–
Analog circuit g
round
16
RESET
I
Reset signal input
17
REC P
O
“L
” :
output when REC pause mode
18
P
A
L
O
“H
” :
P
AL/MESECAM (video b
loc
k
control signal output)
19
A
U
MUTE
O
“H
” :
audio mute signal output
20
NTSC
O
“H
” :
NTSC (video b
loc
k control signal output)
21
KILL IN
I
Color killer detect signal input
22
VCC (+5V)
–
P
o
w
e
r supply
23
AF SWP
O
AF s
w
itching pulse output
24
RF SWP
O
RF s
w
itching pulse output
25
CAP
VS
O
Capstan error signal output
26
DR
UM
VS
O
D
rum motor error signal output
27
QVD
O
Quasi
VD pulse output
28
NC
–
Not used
29
SECAM
O
SECAM CONT SECAM
“L
”
30
NC
–
Not used
31
CTL+
I/O
CTL head signal input/output
32
CTL
–
I/O
CTL head signal input/output
33
VSS GND SER
V
O
–
Ser
v
o
circuit g
round
34
CTL AMP 1
I
CTL Amp
. control (Gain set)
35
CTL AMP 2
I
CTL Amp
. control (Gain set)
36
CTL AMP 3
I
CTL Amp
. control (Gain set)
37
CTL AMP OUT
O
CTL Amp
. output (F
or chec
k)
38
DR
UM FG
I
D
rum FG Schmidt amp
. input
39
DR
UM PG
I
D
rum PG Schmidt amp
. input
40
CAP FG
I
Capstan FG Schmidt input
41
+5V SER
V
O
–
Ser
v
o
circuit po
w
e
r supply
42
+5V OSD
–
OSD circuit po
wer supply
43
VIDEO IN
I
V
ideo signal input
44
VREF
I
Ref
erence bias and clamp bias po
wer pin
45
VIDEO OUT
O
V
ideo signal output
46
CHAR.BIAS
–
Not used
47
AFC LPF
I
AFC LPF pin input
48
AFC OSC
I
AFC oscillator pin input
49
VSS OSD
–
OSD circuit g
round
50
DOSC IN
I
OSD dot cloc
k oscillator (input)
Pin No.
Pin Name
I/O
Function
51
DOSC OUT
O
OSD dot cloc
k oscillator (output)
52
2FSC OUT
O
OSD 2fsc oscillator ter
minal (output)
53
2FSC IN
I
OSD 2fsc oscillator ter
minal (input)
54
C SYNC
I
Composite Sync signal input
55
MESECAM OUT
O
“H
” :
MESECAM (video b
loc
k
control signal output)
56
SHARP 1
O
“H
” :
Activ
e (SHARPNESS control)
57
SHARP 2
O
“H
” :
Activ
e (SHARPNESS control)
58
CHR
OMA 1
O
“H
” :
Activ
e (CHR
OMA control)
59
CHR
OMA 2
O
“H
” :
Activ
e (CHR
OMA control)
60
CHR
OMA 3
O
“H
” :
Activ
e (CHR
OMA control)
61
CHR
OMA 4
O
“H
” :
Activ
e (CHR
OMA control)
62
MODE 1
I
Mechanism section CAM encoder input (data 1)
63
MODE 2
I
Mechanism section CAM encoder input (data 2)
64
MODE 3
I
Mechanism section CAM encoder input (data 3)
65
MODE 4
I
Mechanism section CAM encoder input (data 4)
66
CAP PWM
O
Capstan PWM output
67
CAP R
V
S
O
Capstan re
v
e
rse control signal
“L
” :
when re
ve
rse
68
TEST
I
F
ix
ed to ground
69
32kHz OUT
–
Not used
70
32kHz IN
–
Not used (Fix
ed to +5V)
71
VSS (SYS)
–
Ground
72
10MHz IN
I
System cloc
k ter
m
inal (10MHz)
73
10MHz OUT
O
System cloc
k ter
m
inal (10MHz)
74
END LED
O
T
op/End LED ON/OFF control
75
D
ANCE 4 LED
O
““
L”
:
On,
“H
” :
Off (LED)
”
76
CASSETTE IN LED
O
““
L”
:
On,
“H
” :
Off (Cassette in LED)
”
77
D
ANCE 3 LED
O
““
L”
:
On,
“H
” :
Off (LED)
”
78
D
ANCE 2 LED
O
““
L”
:
On,
“H
” :
Off (LED)
”
79
D
ANCE 1 LED
O
““
L”
:
On,
“H
” :
Off (LED)
”
80
PO
WER R LED
O
““
H
” :
Standb
y,
“
L”
:
P
o
wer on (ON/ST
ANDBY LED)
”
81
PO
WER G LED
O
““
L”
:
Standb
y,
“
H
” :
P
o
wer on (ON/ST
ANDBY LED)
”
82
REMOCON
I
Remote control signal (SIRCS) input
83
TV/O
THER
I
“Connect LINE-1 select
“H
” :
Other
,
“L
” :
T
V
”
84
SYNCHR
O REC LED
O
““
H
” :
On,
“L
” :Off (SYNC REC LED)
”
85
SECAM DET
I
SECAM DET IN.
SECAM
“H
”
86
PICTURE LED
O
“H
” :
Activ
e (RESOLUTION CONTR
OL
II
LED)
87
REC LED
O
““
H
” :
On,
“L
” :Off (REC LED)
”
88
T REEL
I
T
ak
e-up reel FG input
89
S REEL
I
Supply reel FG input
90
HiFi LED
O
““
H
” :
On,
“L
” :Off (HiFi LED)
”
91
HiFi L LED
O
““
H
” :
On,
“L
” :Off (Lch LED)
”
92
TV/VTR
O
RF output
TV/VTR select
93
HiFi R LED
O
““
H
” :
On,
“L
” :
Off (Rch LED)
”
94
SHARPNESS PWM
O
V
ideo IC shar
pness v
o
ltage
9
5
CAM
O
“CAM motor control
“H
” :
F
o
rw
ard,
“M
” :
Br
ak
e
“L
” :
Re
v
e
rse
”
96
CAP QR
O
Capstan step dr
iving
97
AF CLK
O
I2C-b
us cloc
k (HiFi)
98
AF D
A
T
A
O
I2C-b
us data (HiFi)
99
V CLK
O
I2C-b
us cloc
k (Video)
100
V D
A
T
A
O
I2C-b
us data (Video)
6-1
SECTION 6
ADJUSTMENTS
1
2
3
4
Mode
SP
SP
EP
EP
Video signal
Color bar
Monoscope
Color bar
Monoscope
Audio signal
(HiFi/Normal)
400 Hz
Time
Seven minutes
Three minutes
Seven minutes
Three minutes
6-1. MECHANICAL ADJUSTMENTS
Refer to the SERVICE MANUAL of VHS MECHANICAL AD-
JUSTMENT VI.
JUSTMENT VI.
6-2. ELECTRICAL ADJUSTMENTS
2-1.
PRE-ADJUSTMENT PREPARATIONS
Necessary items and indications for total adjustment of electric
circuit of this machine will be described in this chapter.
circuit of this machine will be described in this chapter.
2-1-1.
Instruments to be Used
1) Color TV
2) Oscilloscope 1 or 2 phenomena, band more than 30 MHz, de-
2) Oscilloscope 1 or 2 phenomena, band more than 30 MHz, de-
lay mode, as provided.
3) NTSC pattern generator
4) PAL pattern generator
5) Digital voltmeter
6) Audio level meter
7) Audio noise meter
8) Audio generator
9) Attenuator
10) Alignment tape
4) PAL pattern generator
5) Digital voltmeter
6) Audio level meter
7) Audio noise meter
8) Audio generator
9) Attenuator
10) Alignment tape
Part Code: 8-192-605-36 KRV-51P (PAL)
Part Code: 8-192-605-32 KRV-51N2 (NTSC)
Part Code: 8-192-605-32 KRV-51N2 (NTSC)
2-1-2.
Connection
Unless otherwise specified, connect and adjust the measuring in-
struments as shown in the following diagram.
struments as shown in the following diagram.
During the adjustment, see the Parts Arrangement
Diagram for Adjustments on Page 6-4.
Diagram for Adjustments on Page 6-4.
Fig. 6-2-2
2-1-4.
Alignment Tapes
[Alignment Tape (KRV-51N2 / KRV-51P)]
2-1-3.
Set-up of Adjustment
In this adjustment, PAL or NTSC pattern generator is connected
with LINE input signal terminal. When check to tuner, connected
AERIAL terminal. Check that the amplitudes of video signal SYNC
signal, of picture portions, and of burst signals are flat at
approximately 0.3, 0.7 and 0.3 V, respectively, and that the level
ratio of the burst signal and “red” signal are 0.30: 0.66. Fig. 6-2-2.
shows video signals (color bars) used in adjusting the video section.
with LINE input signal terminal. When check to tuner, connected
AERIAL terminal. Check that the amplitudes of video signal SYNC
signal, of picture portions, and of burst signals are flat at
approximately 0.3, 0.7 and 0.3 V, respectively, and that the level
ratio of the burst signal and “red” signal are 0.30: 0.66. Fig. 6-2-2.
shows video signals (color bars) used in adjusting the video section.
PAL
NTSC
Video output
(75
Ω
)
Pattern generator
VCR
VIDEO LINE IN
Monitor TV
VIDEO LINE OUT
SLV-GA35/GA36/GA45/GA55/GA59/GA65/GF85/GF86/SA34
Fig. 6-2-1
2-1-5.
Specified I/O Level and Impedance
Input/output terminal
Video inputs
LINE IN
: phono jack
1 Vp-p, 75
Ω
, unbalanced, sync negative
Audio inputs
LINE IN
: phono jacks
47 kW, –7.5 dBs (0 dBs = 0.775 Vrms)
More than 10 kW, –4 dBs
More than 10 kW, –4 dBs
Video outputs
LINE OUT: phono jack
1 Vp-p, 75
1 Vp-p, 75
Ω
, unbalanced, sync negative
Audio outputs
LINE OUT: phono jacks
–7.5 dBs at load impedance 47 k
–7.5 dBs at load impedance 47 k
Ω
Output impedance : less than 10
Ω
6-2
2-1-6.
Adjusting Sequence
Make the electrical adjustment in the following sequence.
Checking power supply
Servo system adjustment
Audio system adjustment
2-3.
SERVO SYSTEM ADJUSTMENT
2-3-1.
RF Switching Position Adjustment
(MA-366 Board)
(MA-366 Board)
Purpose:
Adjust the interval between A ch and B ch of tape playback out-
put.
Improve the interchangeability with other tapes and sets.
When it is out of order, the interval appears on the screen, the
screen is disturbed.
Adjust the interval between A ch and B ch of tape playback out-
put.
Improve the interchangeability with other tapes and sets.
When it is out of order, the interval appears on the screen, the
screen is disturbed.
Mode
PB
Signal
Alignment tape SP mode
color
color
bar
Measurement Point
CH1: VIDEO LINE OUT
CH2: Pin 3 of CN202
(V SWP)
CH2: Pin 3 of CN202
(V SWP)
Measuring Instrument
Oscilloscope
Adjusting Element
RV101
Specified Value
6.5 ± 1.0 H (416 ± 60 µsec)
PAL
PAL
6.5 ± 1.0 H (413 ± 60 µsec)
NTSC
NTSC
Adjusting Method:
1) Connect MA-366 board JS401 to the GND for about 1 second
1) Connect MA-366 board JS401 to the GND for about 1 second
to activate the RF switching position adjustment mode.
2) Check that D403 and D405 mutually flash on and off quickly.
3) Check that switching position is 6.5 ± 1.0 H.
4) If not meet the specified value, turn RV101 and repeat steps 3
3) Check that switching position is 6.5 ± 1.0 H.
4) If not meet the specified value, turn RV101 and repeat steps 3
to 4.
Fig. 6-2-3.
Mode
E-E
Measuring Instrument
Digital voltmeter
+12 V check
Measurement Point
Collector of Q604
Specified Value
12.0 ± 0.3 V
+5 V check
Measurement Point
Pin 7 of CN001
Specified Value
5.0 ± 0.25 V
+9 V check
Measurement Point
Emitter of Q604
Specified Value
9.0 ± 0.3 V
MTR12 V check
Measurement Point
Pin 4 of CN001
Specified Value
12.0 ± 0.3 V
2-2.
POWER SUPPLY ADJUSTMENT
2-2-1.
Power Supply Check
(MA-366 Board)
(MA-366 Board)
Checking Method:
1) Confirm that each voltage meets its specified value.
1) Confirm that each voltage meets its specified value.
Approx. 1 Vp-p
Approx. 5 Vp-p
V
enargement
CH2
CH1
CH2
CH1
Vertical sync. signal
6.5
±
1.0 H
(416
±
60
µ
sec) PAL
(413
±
60
µ
sec) NTSC
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