Sony RMT-V259M, Service Manual, Page: 88 / 117

6-2
2-2. POWER SUPPLY CHECK
2-2-1. Power Supply Voltage Check (MA-388 board)
Mode E-E
Measuring instrument Digital voltmeter
38V check
Measurement point CN601 pin
5
Specified value 39 ± 3Vdc
13V check
Measurement point CN601 pin qs
Specified value 13.55 ± 0.45Vdc
MTR12V check
Measurement point CN601 pin 6 or 7
Specified value 13.55 ± 0.45Vdc
CAPSTAN VCC check
Measurement point CN601 pin
8
or
9
Specified value 13.0 ± 0.5Vdc
SW12V check
Measurement point CN601 pin
qh
Specified value 12.0 ± 0.3Vdc
D6V check
Measurement point CN601 pin qk
Specified value 5.9 ± 0.15Vdc
SW5V check
Measurement point CN601 pin
3
or
4
Specified value 5.15
+1.0
Vdc
–0.2
–30V check
Measurement point CN601 pin
ws
Specified value –29 ± 3Vdc
+F, –F check
Measurement point + probe: CN601 pin
w;
– probe: CN601 pin
wd
Specified value 4.6 ± 0.5Vdc
[Check Method]
1)
Check that each power supply voltage satisfies the specified
value.
2-1-5. Input/Output Levels and impedance
Video input: LINE-1 / LINE-3 IN(*1) / LINE-4 IN(*2)
EURO AV connector
Input signal: 1Vp-p, 75 ohms, unbalanced, sync
negative
LINE-2 IN / LINE-3 IN(*2), Phono jack
Input signal: 1Vp-p, 75 ohms, unbalanced, sync
negative
Video output: LINE-1, EURO AV connector
Output signal: 1Vp-p, 75 ohms, unbalanced, sync
negative
LINE-2 OUT(*3), Phono jack
Output signal: 1Vp-p, 75 ohms, unbalanced, sync
negative
Audio input: LINE-1 / LINE-3 IN(*1) / LINE-4 IN(*2)
EURO AV connector
Input level: –6.3dBs
Input impedance: more than 47 kilohms
LINE-2 IN/ LINE-3 IN(*3), Phono jack
Input level: –7.5dBs
Input impedance: more than 47 kilohms
(0dBs=0.775Vrms)
Audio output:LINE-1, EURO AV connector
Output level: –6.3dBs at load impedance 47 kilohms
Output impedance: less than 10 kilohms
LINE-2 OUT(*3), Phono jack
Output level: –7.5dBs at load impedance 47 kilohms
Output impedance: less than 10 kilohms
*1 : SLV-SE850/SF900 model only
*2 : SLV-SF990 model only
*3 : SLV-SF950/SF990 model only
2-1-6. Adjustment Sequence
The adjustments should be performed in the following sequence.
Power Supply Check
System Control Adjustment
Servo System Adjustments
Video System Check
Audio System Adjustments