Sony SLV-K867CH / SLV-K867PS / SLV-K877MN / SLV-K877PS / SLV-K877TK / SLV-KH7ME / SLV-KH7PS / SLV-KH7TK Service Manual ▷ View online
6-2
2-1-5. Input/Output Levels and Impedance
Video input:
Video input:
LINE IN
Input signal: 1Vp-p, 75ohms, unbalanced,
sync negative
Input signal: 1Vp-p, 75ohms, unbalanced,
sync negative
Video output: LINE OUT
Output signal: 1Vp-p, 75ohms, unbalanced,
sync negative
sync negative
Audio input:
LINE IN
Input level: –7.5 dBs
(0dBs= 0.775Vrms)
Input impedance: more than 47 kilohms
Input level: –7.5 dBs
(0dBs= 0.775Vrms)
Input impedance: more than 47 kilohms
Audio output: LINE OUT
Standard level: –7.5dBs 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.
The adjustments should be performed in the following sequence.
2-2.
POWER SUPPLY CHECK
2-2-1. Output Voltage Check (MA-306 Board)
Mode
E-E
Measuring Instrument
Digital voltmeter
SW 12V Check
Measurement point
IC641 pin 2
Specified value
12.0 ± 0.5V
MTR13V Check
Measurement point
Q635 C
Specified value
13.2 ± 0.8V
SW5V Check
Measurement point
Q661 E
Specified value
5.2 ± 0.5V
[Check Method]
1)
1)
Each of these supply voltages must meet its specified value.
Power Supply Check
Servo System Adjustments
Video System Adjustments
Audio System Adjustments
6-3
2-3.
SERVO SYSTEM CHECK
Unless otherwise specified, set the switches to the following
positions.
positions.
•
PROGRAM
switch .......................... LINE 1 (K867, K877)
•
INPUT SELECT switch ............................... LINE 1 (KH7)
•
TAPE SPEED
switch ......... SP (K867, K877 is REMOCON)
2-3-1. RF Switching Position/
AF Switching Position Adjustments
(MA-306 Board)
(MA-306 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
(RF switching position)
CN551 pin 1 (REC AFM)
(AF switching position)
CN551 pin 1 (REC AFM)
(AF switching position)
CH2: CN502 pin 3 (RF SWP)
Measuring instrument
Oscilloscope
Specified value
6.5 ± 0.5H (416 ± 32
µ
sec)
[Adjustment Method]
1)
1)
Short-circuit between JS161 and ground for about 1 second to
activate the RF switching position adjustment mode.
activate the RF switching position adjustment mode.
2)
Check that “RF” is indicated on FL display.
3)
Using the channel + and – buttons, adjust to 416 ± 32
µ
sec (6.5
± 0.5H).
4)
Press the PAUSE button.
5)
The set goes to the AF switching position adjustment mode.
Fig. 6-2-3.
6)
Check that “HF” is indicated on FL display.
7)
Using the channel + and – buttons, minimize a chipped portion.
At this time, confirm that a noisy sound is not heard.
At this time, confirm that a noisy sound is not heard.
8)
Press the PAUSE button.
9)
Press the EJECT button.
Fig. 6-2-4.
6-4
2-4.
VIDEO SYSTEM CHECKS AND ADJUSTMENT
For the video system checks, follow the checking procedures given
below as a rule. The color bar video signal supplied from the pattern
generator is used as the video input signal for the video system
adjustment of the recording mode. Check that the signal satisfies
the specified value designated in the “Check of input signal” (Fig.
6-2-2)
Unless otherwise specified, set the switches to the following
positions.
below as a rule. The color bar video signal supplied from the pattern
generator is used as the video input signal for the video system
adjustment of the recording mode. Check that the signal satisfies
the specified value designated in the “Check of input signal” (Fig.
6-2-2)
Unless otherwise specified, set the switches to the following
positions.
•
PROGRAM
switch .......................... LINE 1 (K867, K877)
•
INPUT SELECT switch ............................... LINE 1 (KH7)
•
TAPE SPEED
switch ......... SP (K867, K877 is REMOCON)
[Checking Sequence]
1)
1)
X’tal OSC Check
2)
SYNC AGC Check
3)
White clip/Dark clip Check
4)
Recording Y Level Check
5)
Recording Chroma Level Check
6)
Playback Level Check
7)
VCO frequency adjustment
2-4-1. X’tal OSC Check (MA-306 Board)
Mode
Playback
Signal
Alignment tape: SP Color bar portion
Measurement point
IC201 pin %ª
Measuring instrument
Oscilloscope and Frequency counter
Specified value
4,433,619 ± 96Hz
Note:
A frequency counter should be connected through a buffer
amplifier (oscilloscope, etc.) having a high impedance and
a low capacitance.
amplifier (oscilloscope, etc.) having a high impedance and
a low capacitance.
[Check Method]
1)
1)
Check that the oscillation frequency satisfies the specified value
and that the oscillation voltage is 500 ± 200mVp-p.
and that the oscillation voltage is 500 ± 200mVp-p.
Fig. 6-2-5.
2-4-2. SYNC AGC Check (MA-306 Board)
Mode
E-E
Signal
Color bar
Measurement point
IC201 pin #•
Measuring instrument
Oscilloscope
Specified value
A=2.10 ± 0.14Vp-p
[Check Method]
1)
1)
Check that the Video signal level (A) satisfies the specified
value.
value.
Fig. 6-2-6.
2-4-3. White Clip/Dark Clip Check (MA-306 Board)
Mode
E-E
Signal
Color bar
Measurement point
IC201 pin #¶
Measuring instrument
Oscilloscope
Specified value
White clip : 190 ± 15%
Dark clip : 50 ± 10%
Dark clip : 50 ± 10%
Connect a resistor of 3.3k
Ω
between IC201 pin $™ and GND.
[Check Method]
1)
1)
Check that the white clip level is 190 ± 15% to the white (100%)
level.
level.
2)
Check that the dark chip level is 50 ± 10% to the white (100%)
level.
level.
Fig. 6-2-7.
6-5
2-4-4. Recording Y Level Check (MA-306 Board)
Mode
E-E
Signal
No-signal
Measurement point
IC201 pin !•
Measuring instrument
Oscilloscope
Specified value
A=250 ± 50mVp-p
[Check Method]
1)
1)
Check that the recording RF signal satisfies the specified value.
Fig. 6-2-8.
2-4-5. Recording Chroma Level Check
(MA-306 Board)
Mode
Recording
Signal
Color bar
Measurement point
IC201 pin !¢
Measuring instrument
Oscilloscope
Specified value
A=380 ± 40mV
[Check Method]
1)
1)
Confirm the amplitude of recording chroma level becomes the
specified value.
specified value.
Fig. 6-2-9.
2-4-6. Playback Level Check (MA-306 Board)
Mode
Playback
Signal Alignment
Alignment tape : SP mode color bar
portion
portion
Measurement point
Video LINE OUT terminal
Measuring instrument
Oscilloscope
Specified value
A=1.00 ± 0.02Vp-p
[Check Method]
1)
1)
Check that the playback level satisfies the specified value.
Fig. 6-2-10.
2-4-7. VCO Frequency Adjustment (MA-306 Board)
Mode
Playback
Signal
Alignment tape : SP mode color bar
portion
portion
Measurement point
IC401 pin @§
Measuring instrument
Digital voltmeter
Adjustment element
CT401
Specified value
A=2.80 ± 0.05Vdc
[Check Method]
1)
1)
Adjust CT401 until DC output level at IC401 pin @§ (F. C)
satifies the specification.
satifies the specification.
Fig. 6-2-11.
2-5.
AUDIO SYSTEM ADJUSTMENT
• For the adjustment of the audio system, perform in the SP mode
if there is no special notes. Use the alignment tape.
[Connecting Instruments]
Fig. 6-2-12.
• Adjust in the SP mode if there is no special indications.
• Perform the adjustment setting the switch on the following
• Perform the adjustment setting the switch on the following
positions.
•
PROGRAM
switch .......................... LINE 1 (K867, K877)
•
INPUT SELECT switch ............................... LINE 1 (KH7)
[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.
Overall Output level and distortion factor check
4.
Overall noise level check.
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