Sony SLV-SE310, Service Manual

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7-3 7-4 E
2-5. ADJUSTING PARTS LOCATION DIAGRAM
MA-401 BOARD
(CONDUCTOR SIDE)
LINE-1(TV)
CN500
Q601
E
B
Q600
B
E
Q602
B E
1 5
CN262
2-3. SERVO SYSTEM CHECK
2-3-1. RF Switching Position Adjustment
(MA-401 Board)
[Adjustment Purpose]
To adjust the link of the A-ch and B-ch of the tape playback out-
puts.
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: CN262 pin 1 (PB RF)
CH2: CN262 pin
2
(RF SWP)
Measuring instrument Oscilloscope
Adjusting element Remote commander CH+/–
Specified value A=minimize
[Adjustment Method]
1) Playback the alignment tape.
2) Short CN262 pin
5 to Ground.
3) Check that “A P” is indicated on FL display.
4) Adjust so that part A becomes minimized at CH +/–.
5) Write data in EEPROM by pressing PAUSE button.
6) The display “A P” disappears and then the Adjustment mode
terminates.
Fig. 7-2-3
2-4. AUDIO SYSTEM ADJUSTMENTS
[Connecting Instruments]
Fig. 7-2-4
A
CH1
PB RF
CH2
RF SWP
CN500
3
A (L) OUT
4
A GND
J481 AUDIO IN
Audio oscillator
Attenuator
600
Ω
Audio level meter
or distortion meter
47 k
Ω
VTR
2-4-1. Normal Audio System Adjustment
• Make adjustment in the SP mode unless otherwise specified.
Use a normal VHS cassette for an adjustment tape.
• Set AUDIO MONITOR to normal.
2-4-2. ACE Head Adjustment
Refer to the VHS mechanical adjustment manual (S MECHA-
NISM) (9-921-647-11).
2-4-3. E-E Output Level Check
[Adjustment purpose]
Confirm that the output level adjust the reference input is within the
specification.
Mode E-E
Signal 400 Hz, –6.3 dBs
Measurement point CN500 Pin 3
Measuring instrument Audio level meter
Specified value –6.3 ± 2 dBs
[Check Method]
1) Input signal of 400 Hz and –6.3 dBs to the J480.
2) Check that the audio output level is –6.3 ± 2 dBs.
2-4-4. Frequency Response Check
[Adjustment purpose]
Confirm that the frequency characteristic is within the specification.
Mode REC and PB (SP mode)
Signal 400 Hz, –26.3 dBs
7 kHz, –26.3 dBs
Measurement point CN500 Pin
3
Measuring instrument Audio level meter
Specified value 0 ± 3 dB
Note: Tape path adjustment must have been completed.
[Confirmation Method]
1) Supply a signal of 400 Hz, –26.3 dBs to J481 AUDIO IN.
2) Connect the audio level meter to CN500 Pin
3
.
3) Adjust the attenuator so that the audio level meter will indi-
cate –26.3 dBs.
4) Make recording in the SP mode.
5) Set an audio line input signal to 7 kHz and make recording.
6) Playback a recorded portion, and measure output levels at 400
Hz and 7 kHz.
7) Confirm that the 7 kHz playback output level within a range
of the 400 Hz playback output level 0 dB to ± 3 dB.