Sony SLV-E170EE - Page 52

2-3. SERVO SYSTEM CHECK
Unless otherwise specified, set the switches to the following
positions.
© LCHANNEL J SWiHHCH oo. el ccceseeeeeeeeeereeeneeneneeeetens LINE
© | TAPE SPEED | SWitch oo. csesessneeseseteneteesenseeenereeneees SP
2-3-1. RF Switching Position Adjustment
(MA-293 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.
Playback
Alignment tape: SP color bar portion
CH1: Video LINE OUT terminal
CH2: CN261 pin @ (RF SWP)
Measuring instrument | Oscilloscope
Specified value 6.5 + 0.5H (416 + 32 usec)
[Adjustment Method]
1) Short-circuit between JS401 and ground on MA-293 board for
about | second to activate the RF switching position adjustment
mode. ;
2) Check that “ADJ” is indicated on FL display.
3) Using the channel + and — buttons, adjust to 416 + 32psec (6.5
+ 0.5H).
4) Press the PAUSE button.
5) Press the EJECT button.
7 kK—v—| f
enlarrgement
Vertical sync. signal
baat
CH2 6.5 +0.5H
CN261 PIN @ (416 + 32usec)
RF SWP))
Fig. 7-2-3,
2-4. VIDEO SYSTEM CHECKS
For the video system checks, follow the checking procedures given
below as arule. 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.
7-2-2)
Unless otherwise specified, set the switches to the following
positions.
© LCHANNEL | SWICK oo. ccecceteccerseneeeseenseaatsceeenene LINE
© [TAPE SPEED | sWitch 00.0... cccereceeereeeeceeesseseasenrestensese SP
{Checking Sequence]
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
2-4-1. X’tal OSC Check (MA-293 Board)
"Mode di Playback Sd
[Signal [Alignment ape SP Color bar portion
Note: A frequency counter should be connected through a buffer
amplifier (oscilloscope, etc.) having a high impedance and
a low capacitance.
[Check Method]
1) Check that the oscillation frequency satisfies the specified value
and that the oscillation voltage is 500 + 200mVp-p.
500 + 200mVp-p
|
4,443,619 + 90Hz
Fig. 7-2-4.