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5-4E
Pin No.
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
Pin Name
DOSC OUT
2FSC
2FSC IN
CSYNC
CAP RVS
TRACK. LED
C. IN LED
AMS
SUR. CONT1
SUR. CONT2
SUR. CONT3
MODE1
MODE2
MODE3
MODE4
CAP TRQ PWM
POWER LED
TEST
32 kHz (IN)
32 kHz (OUT)
VSS
10 MHz (IN)
10 MHz (OUT)
END LED
DNS 1 LED
DNS 2 LED
DNS 3 LED
DNS 4 LED
DNS 5 LED
MESECAM DET, TV/VTR
REC LED
SIRCS
HF LED
L LED
R LED
SUR LED-SYNC REC
SHARPNESS LED
T REEL
S REEL
PB
LINE1
ADJ-B
ADJ-A
SHARPNESS VR
CAM
CAP QR
AF CLK
AF DATA
V CLK
V DATA
I/O
O
O
I
I
O
O
O
I
O
O
O
I
I
I
I
O (PWM)
O
I
O
I
O
O
O
O
O
O
O
I/O
O
I
O
O
O
O
O
I
I
O
O
I
I
O
O (3 VALUES)
O
O
O
O
O
Function
DOSC OUT
2FSC
2FSC IN
Composite sync. signal input
Capstan reverse control signal in FWD: H, REV: L
Auto tracking LED On: H, Off: L
Cassette in LED On: H, Off: L
Auto music search
Surround control signal output 1
Surround control signal output 2
Surround control signal output 3
Mechanism CAM encoder input 1
Mechanism CAM encoder input 2
Mechanism CAM encoder input 3
Mechanism CAM encoder input 4
Capstan torque PWM output
Power LED control On: H, Off:L
Not used. Connected to ground.
32 kHz clock terminal
32 kHz clock terminal
Ground
10MHz clock terminal
10MHz clock terminal
LED pulse drive
LED On: L, Off: H
LED On: L, Off: H
LED On: L, Off: H
LED On: L, Off: H
LED On: L, Off: H
SECAM IC RF converter/TV/VTR select
REC LED On: H, Off: L
SIRCS signal input
HiFi LED On: H, Off: L
L ch LED On: H, Off: L
R ch LED On: H, Off: L
Surround/SYNC REC LED On: H, Off: L
SHARPNESS LED On: H, Off: L
Take-up reel FG input
Supply reel FG input
Play mode: L
LINE 1 select
PICTURE CONTROL signal input
PICTURE CONTROL signal input
Video IC Sharpness Voltage
CAM motor drive H: Forward, M: Brake, L: Reverse
Capstan motor
I2C-bus clock(HiFi)
I2C-bus data(HiFi)
I2C-bus clock(Video)
I2C-bus data(Video)
6-1
SECTION 6
ADJUSTMENTS
SLV-GA30/GA50/GA66/GA70K/GA77K/GF80/GF90K/GF99K/P66/PH99
6-1 MECHANICAL ADJUSTMENTS
For the mechanical adjustments, please refer to the
“VHS MECHANICAL ADJUSTMENT MANUAL
(S MECHANISM)” (9-921-647-11).
“VHS MECHANICAL ADJUSTMENT MANUAL
(S MECHANISM)” (9-921-647-11).
6-2. ELECTRICAL ADJUSTMENTS
See the adjusting part location diagram from on page 6-6
for the adjustment.
for the adjustment.
2-1.
PREPARATION BEFORE ADJUSTMENT
2-1-1.
Equipment Required
The measuring instruments used for this alignment include:
1)
1)
Monitor TV
2)
Oscilloscope, dual-trace, bandwidth of 30 MHz or more, with
delay mode (A probe 10:1 should be used unless otherwise
specified.)
delay mode (A probe 10:1 should be used unless otherwise
specified.)
3)
Frequency counter
4)
NTSC Pattern generator
5)
PAL Pattern generator
6)
Digital voltmeter
7)
Audio generator
8)
Audio level meter
9)
Audio attenuator
10) Alignment tapes
KRV-51P (PAL)
Part No. : 8-192-605-36
KRV-51N2 (NTSC) Part No. : 8-192-605-32
2-1-2.
Equipment Connection
Unless otherwise specified, connect and adjust the measuring
instruments as shown in the following diagram.
instruments as shown in the following diagram.
Fig. 6-2-1
2-1-3.
Set-up of Adjustment
In this adjustment, PAL or NTSC pattern generator is connected
with LINE input terminal. When check to tuner, connected AERIAL
terminal. Check that the synchronizing signal of the Y signal has
an amplitude of approximately 0.7 V and that the burst signal has
an amplitude of approximately 0.3 V and its waveform is flat. And
check that the level ratio of burst signal to “red” signal is 0.30 :
0.66. The video signal (color bar) used for electrical aligning this
unit is shown in Fig. 6-2-2.
with LINE input terminal. When check to tuner, connected AERIAL
terminal. Check that the synchronizing signal of the Y signal has
an amplitude of approximately 0.7 V and that the burst signal has
an amplitude of approximately 0.3 V and its waveform is flat. And
check that the level ratio of burst signal to “red” signal is 0.30 :
0.66. The video signal (color bar) used for electrical aligning this
unit is shown in Fig. 6-2-2.
PAL model
NTSC model
Fig. 6-2-2 Color Bar Signals of Pattern Generator
2-1-4.
Alignment Tape
• Contents of KRV-51N2/51P
Red
Horizontal sync signal
Burst signal
(It must be flat.)
(It must be flat.)
Approx.
0.3 V
0.3 V
White (Approx. 75%)
Approx. 0.3 V
Approx. 0.7 V
VIDEO LINE IN
VIDEO LINE OUT
Video output
(75
Ω
)
Pattern generator
VCR
Monitor TV
White (100%)
About 0.7 V
About
0.3 V
0.3 V
Horizontal sync signal
Red
Burst signal
(It must be flat.)
(It must be flat.)
About
0.3 V
0.3 V
1
2
3
4
Mode
SP
LP
Period
7 minutes
3 minutes
7 minutes
3 minutes
Video signal
Color bar
Monoscope
Color bar
Monoscope
Audio signal
Hi-Fi
400Hz
(L/R)
Normal
400Hz
6-2
2-1-5.
Input/Output Levels and Impedance
Video input: LINE IN
Input signal: 1 Vp-p, 75 ohms, unbalanced,
sync negative
sync negative
Video output: LINE OUT
Output signal: 1 Vp-p, 75 ohms, unbalanced,
sync negative
sync negative
Audio input: LINE IN
Input level: –7.5 dBs
(0 dBs= 0.775 Vrms)
Input impedance: more than 47 kilohms
(0 dBs= 0.775 Vrms)
Input impedance: more than 47 kilohms
Audio output:LINE OUT
Standard level: –7.5 dBs at load impedance 47
kilohms
Output impedance: less than 10 kilohms
kilohms
Output impedance: less than 10 kilohms
2-1-6.
Adjustment Sequence
The adjustments should be performed in the following sequence.
2-2.
POWER SUPPLY CHECK
2-2-1.
Output Voltage Check (MA-336 Board)
Mode
E-E
Measuring Instrument
Digital voltmeter
+12 V Check
Measurement point
CN201 pin
!º
Specified value
11.5 –13.0 V
+5 V Check
MP
CN206 pin
!£
SV
5.0 –5.6 V
+9 V Check
MP
Emitter of Q961
SV
8.5 –10.0 V
MTR12 V Check
Measurement point
CN204 pin
4
Specified value
11.5 –13.0 V
[Check Method]
1)
1)
Each of these supply voltages must meet its specified value.
Power Supply Check
Servo/Video System Adjustments
Audio System Adjustments
6-3
2-3.
SERVO SYSTEM CHECK
2-3-1.
RF Switching Position Adjustment
(MA-336 Board)
[Adjustment Purpose]
To adjust the link of the A-ch and B-ch of the tape playback outputs.
To make the unit compatible with other tapes and units. If this
specification is not satisfied, the link will appear on the screen and
the screen will be disrupted, etc.
To adjust the link of the A-ch and B-ch of the tape playback outputs.
To make the unit compatible with other tapes and units. If this
specification is not satisfied, the link will appear on the screen and
the screen will be disrupted, etc.
Mode
Playback
Signal
Alignment tape: SP color bar portion
Measurement point
CH1: Video LINE OUT
(75
Ω
terminated)
(AF switching position)
CH2: CN101 pin
3 (V SWP)
Measuring instrument
Oscilloscope
Adjusting element
RV202
Specified value
6.5 ± 1 H (413 ± 60
µσεχ): ΝΤΣΧ
6.5 ± 1 H (416 ± 32
µ
sec): PAL
[Adjustment Method]
1)
1)
Playback the alignment tape.
2)
Short-circuit between pins
1 and 2 of CN210.
3)
Check that “RF” is indicated on FL display.
4)
Check that switching position is 6.5 ± 1 H.
5)
If not meet the specified value, turn RV202 and repeat steps 1)
to 3).
to 3).
Fig. 6-2-3
CN202 pin
3
6.5
±
1 H
(413
±
60
µ
sec): NTSC
(416
±
32
µ
sec): PAL
Approx.
1Vp-p
1Vp-p
CH1
CH2
Approx.
5Vp-p
5Vp-p
CH1
CH2
V
Enlargement
Vertical sync. signal
2-4.
AUDIO SYSTEM ADJUSTMENT
• Adjust both L ch and R ch.
[Connecting Instruments]
[Connecting Instruments]
Fig. 6-2-4
2-4-1.
Hi-Fi Audio System Adjustment
(Hi-Fi model only)
• Perform the adjustment setting the switch on the following
positions.
• AUDIO MONITOR ..................................................... STEREO
[Adjustment Method]
1.
1.
ACE head adjustment.....Refer to the VHS mechanical
adjustment manual (S MECHANISM)(9-921-647-11).
adjustment manual (S MECHANISM)(9-921-647-11).
2.
E-E output level check
3.
“Recording Bias Adjustment”
Audio line OUTPUT L/R
Audio line INPUT L/R
Audio oscillator
Attenuator
600
Ω
Audio level meter
or distortion meter
or distortion meter
47 k
Ω
VTR
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