Sony SLV-ED8KR / SLV-ED9KR Service Manual ▷ View online
7-1
SECTION 7
ADJUSTMENTS
SLV-ED8/ED9
7-1. MECHANICAL ADJUSTMENTS
Refer to the SERVICE MANUAL of VHS MECHANICAL AD-
JUSTMENT VI.
JUSTMENT VI.
7-2. ADJUSTMENTS
2-1.
EEP ROM INITIAL DATA INPUT
When EEP ROM (IC303 on FR-137 board) was changed, make it
sure to input the data shown below and to perform both “3-3-1. RF
Switching Position adjustment” and “3-4-1. 1. AF Switching Po-
sition adjustment” .
sure to input the data shown below and to perform both “3-3-1. RF
Switching Position adjustment” and “3-4-1. 1. AF Switching Po-
sition adjustment” .
Input Method:
1) Connect the connector 4P (1-568-942-11) with JL322-JL325
1) Connect the connector 4P (1-568-942-11) with JL322-JL325
on FR-137 board by a lead wire.
FR-137 board
Pin No
JL322
D GND
1
JL323
LANC OUT
2
JL324
LANC IN
3
JL325
D6V
4
2) Connect adjustment remote (J-6082-053-B) with the connec-
tor prepared at 1) by using LANC jig (J-6090-051-A).
3) Turn on the power.
4) Input data: 00 in adress: 00 on Page: 1.
5) Input data on Page 0 as following table.
4) Input data: 00 in adress: 00 on Page: 1.
5) Input data on Page 0 as following table.
Page
0
Adress
01
02
Data
SLV-ED8KR
03
00
SLV-ED9KR
03
01
6) Turn off the Power.
7) Disconnect the adjustment remote and LANC jig from the
7) Disconnect the adjustment remote and LANC jig from the
connector.
8) Disconnect the connector from FR-137 board.
During the adjustment, see the Parts Arrangement
Diagram for Adjustments on Page 7-6.
Diagram for Adjustments on Page 7-6.
Video output
(75
Ω
)
Pattern generator
VCR
VIDEO LINE IN
Monitor TV
VIDEO LINE OUT
7-3. ELECTRICAL ADJUSTMENTS
3-1.
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.
3-1-1.
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) Digital voltmeter
5) Audio level meter
6) Audio noise meter
7) Audio generator
8) Attenuator
9) Alignment tape
4) Digital voltmeter
5) Audio level meter
6) Audio noise meter
7) Audio generator
8) Attenuator
9) Alignment tape
Part Code: 8-192-605-32 KRV-51N2
3-1-2.
Connection
Unless otherwise specified, connect and adjust the measuring in-
struments as shown in the following diagram.
struments as shown in the following diagram.
Fig. 7-3-1
7-2
3-1-6.
Adjusting Sequence
Make the electrical adjustment in the following sequence.
Mode
E-E
Measuring Instrument
Digital voltmeter
–10 V check
Measurement Point
Pin 9 of CN600
Specified Value
–10.3 ±0.8 V
+6 V check
Measurement Point
Pin 7, 8 of CN600
Specified Value
5.9 ± 0.2 V
+13 V check
Measurement Point
Pin 2, 3 of CN600
Specified Value
13.3 ± 0.5 V
+35 V check
Measurement Point
Pin 1 of CN600
Specified Value
38.0 ± 3.0 V
3-2.
POWER SUPPLY ADJUSTMENT
3-2-1.
Power Supply Check
(SR-718 BOARD)
(SR-718 BOARD)
Checking Method:
1) Confirm that each voltage meets its specified value.
1) Confirm that each voltage meets its specified value.
3-2-2.
+6 V Adjustment
(SR-718 BOARD)
(SR-718 BOARD)
Mode
REC or PB
Measuring Instrument
Digital voltmeter
Measurement Point
Pin 7, 8 of CN201
Adjusting Element
RV201
Specified Value
5.9 ± 0.2 V
Checking power supply
Servo system adjustment
Audio system adjustment
Video system adjustment
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
Fig. 7-3-2
3-1-4.
Alignment Tapes
[Alignment Tape (KRV-51N2)]
3-1-3.
Set-up of Adjustment
In this adjustment, 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. 7-3-2. shows video
signals (color bars) used in adjusting the video section.
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. 7-3-2. shows video
signals (color bars) used in adjusting the video section.
3-1-5.
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
7-3
3-3.
SERVO SYSTEM ADJUSTMENT
3-3-1.
RF Switching Position Adjustment
(MA-325 Board)
(MA-325 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 bar
color bar
Measurement Point
CH1: Pin 2 of CN501
CH2: Pin 3 of CN501
(RF SWP)
CH2: Pin 3 of CN501
(RF SWP)
Measuring Instrument
Oscilloscope
Specified Value
6.5 ± 0.5 H (410 ± 32 µsec)
Adjusting Method:
1) Connect MA-325 board JS161 to the GND for about 1 second
1) Connect MA-325 board JS161 to the GND for about 1 second
to activate the RF switching position adjustment mode.
2) Check appear “rFxx” on FL display.
3) Using the CHANNEL + and – buttons, adjust to 6.5 ± 0.5 H.
4) Press the PAUSE button.
3) Using the CHANNEL + and – buttons, adjust to 6.5 ± 0.5 H.
4) Press the PAUSE button.
Fig. 7-3-3.
Approx. 1 Vp-p
Approx. 5 Vp-p
V
enargement
CH2
CH1
CH2
CH1
Vertical sync. signal
6.5
±
0.5 H
(410
±
32
µ
sec)
3-4.
AUDIO SYSTEM ADJUSTMENTS
• Adjust both Lch and Rch.
[Connection]
Fig. 7-3-4.
3-4-1.
Hi-Fi Audio System Adjustment
• Set switches and knobs to the following positions to make ad-
justment unless otherwise specified.
INPUT SELECT switch ..................... LINE
AUDIO MONITOR ............................ STEREO
INPUT SELECT switch ..................... LINE
AUDIO MONITOR ............................ STEREO
[Adjustment Sequence]
1. AF Switching Position Adjustment
2. Frequency Responce Check
3. Overall Level Characteristic and Distortion Factor
1. AF Switching Position Adjustment
2. Frequency Responce Check
3. Overall Level Characteristic and Distortion Factor
Check
4. Overall S/N Check
1.
AF Switching Position Adjustment (MA-325 Board)
Purpose:
Adjust the interval between A CH and B CH of tape playback
output. Improve the interchangeability with other tapes and sets.
When it is out of order, noisy sound is increased and big noise is
heard.
Adjust the interval between A CH and B CH of tape playback
output. Improve the interchangeability with other tapes and sets.
When it is out of order, noisy sound is increased and big noise is
heard.
Mode
PB
Signal
Alignment tape SP mode
color bar
color bar
Measurement point
CH2: Pin 1 of CN341
CH1: Pin 3 of CN501
CH1: Pin 3 of CN501
Measuring Instrument
Oscilloscope
Specified Value
Fig. 7-3-5
Adjusting Method:
1) Connect MA-325 board JS161 to the GND for about 1 second
to activate the RF switching position adjustment mode.
2) Press the PAUSE button to activate the AF switching position
adjustment mode.
3) Check appear “HFxx” on FL display.
4) Using the CHANNEL + and – buttons, minimize a chipped
4) Using the CHANNEL + and – buttons, minimize a chipped
portion. At this time, confirm that a noisy sound is not heard.
5) Press the PAUSE button.
6) Press the EJECT button.
6) Press the EJECT button.
Audio
generator
generator
Attenuator
600
Ω
47 k
Ω
VCR
Audiolevel meter or
distortion meter
AUDIO LINE OUT
AUDIO LINE IN
Feed signal both
channelssimultaneously.
Feed signal both
channelssimultaneously.
7-4
3. Overall Level Characteristic and Distortion Factor
Check
Purpose:
Check the record level, play level, and distortion factor against the
reference input.
Check the record level, play level, and distortion factor against the
reference input.
Mode
REC and PB (SP mode)
Signal
400 Hz, –7.5 dBs
Measurement point
Audio output terminal
Measurement equipment
Audio level meter and
distortion factor meter
distortion factor meter
Specified value
Playback level: –7.5 ± 2 dBs
Distortion factor: 1% or less
Distortion factor: 1% or less
Confirmation Method:
1) Supply an audio signal of 400 Hz, –7.5 dBs simultaneously to
1) Supply an audio signal of 400 Hz, –7.5 dBs simultaneously to
both L and R channels of Audio Line Input.
2) Make recording
3) Play back a recorded portion.
4) Confirm that a playback level is –7.5 ±2 dBs.
5) Confirm that a distortion factor is within 1%.
3) Play back a recorded portion.
4) Confirm that a playback level is –7.5 ±2 dBs.
5) Confirm that a distortion factor is within 1%.
4. Overall S/N Check
Purpose:
Confirm that the S/N is within the specification.
Confirm that the S/N is within the specification.
Mode
REC and PB (SP mode)
Signal
Short
Measurement point
Audio output terminal
Measurement equipment
Audio noise meter
Specified value
–67.5 dBs or less
Confirmation Method:
1) Connect both L and R channels of audio line input to the GND.
2) Start recording.
3) Play the recorded part to confirm that the noise is below –67.5
1) Connect both L and R channels of audio line input to the GND.
2) Start recording.
3) Play the recorded part to confirm that the noise is below –67.5
dBs.
Fig. 7-3-5.
2.
Frequency Responce Check
Purpose:
Confirm that the frequency characteristic is within the specifica-
tion.
Confirm that the frequency characteristic is within the specifica-
tion.
Mode
REC and PB (SP, EP mode)
Signal
400 Hz, –7.5 dBs
20 Hz, –7.5 dBs
20 kHz, –7.5 dBs
20 Hz, –7.5 dBs
20 kHz, –7.5 dBs
Measurement point
Audio output terminal
Measurement equipment
Audio level meter
Specified value
0 ± 2 dB
Note:
Tape path adjustment must have been completed.
Confirmation Method:
1) Supply a signal of 400 Hz, –7.5 dBs to both L and R channels
1) Supply a signal of 400 Hz, –7.5 dBs to both L and R channels
of Audio Line Input.
2) Connect the audio level meter to the Audio Line Output.
3) Adjust the attenuator so that the audio level meter will indi-
3) Adjust the attenuator so that the audio level meter will indi-
cate –7.5 dBs.
4) Make recording.
5) Set an audio line input signal to 20 Hz and make recording.
6) Set an audio line input signal to 20 kHz and make recording.
7) Playback a recorded portion, and measure output levels at 400
5) Set an audio line input signal to 20 Hz and make recording.
6) Set an audio line input signal to 20 kHz and make recording.
7) Playback a recorded portion, and measure output levels at 400
Hz and 20 Hz and 20 kHz.
8) Confirm that the 20 Hz and 20 kHz playback output level within
a range of the 400 Hz playback output level 0 ± 2 dB.
CH2
CH1
RF SWP
RF SWP
OK
NG
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