Sony Glasstron PLM-S700E, Service Manual

Page: 13 / 94

3-1
5. Setting up Input Signals
(1) Video Signal
In adjusting this set, video signals obtained from the pattern
generator are used, and therefore these video output signals
must satisfy the specification. Connect the oscilloscope to the
VIDEO IN terminal, and confirm that the sync signal ampli-
tude of video signals is approximately 0.3 V, the amplitude of
video part is approximately 0.7 V, burst signal amplitude is
approximately 0.3 V and flat, and the level ratio of burst sig-
nal to “red” signal is 0.30 : 0.66.
Where “chroma signal, and color bar signal with burst signal
turned off” is specified in the text, enter chroma signal and
color bar signal of which burst signal is turned off to the VIDEO
IN terminal as video input signals for adjustment.
(2) PC Signal (RGB signal)
SECTION 3
ELECTRICAL ADJUSTMENTS
Precautions on adjustment:
1. Perform the adjustment in the given order.
2. Power supply voltage: DC 8.4 V
3. Equipment required
Electrical adjustment requires the following measuring equip-
ment.
(1) Oscilloscope: 2 phenomena, band 30 MHz or more, with de-
lay mode (use 10 : 1 probe unless otherwise specified)
(2) Pattern generator
(3) Regulated power supply
×
2
(4) Digital voltmeter
(5) Frequency counter
(6) Connector for adjustment
4. Measurement points for adjustment are located at CN1003 on
the YC-148 board and at CN206 on the MA-324 board. The
pin No. and signal name of CN1003 and CN206 are listed be-
low.
• YC-148 Board, CN1003
• MA-324 Board, CN206
Preparation:
Connect electrical blocks as shown below.
Pin No. Signal Name
1 GND
2 GND
3 GND
4 4FSC
5 GND
Pin No. Signal Name
6 GND
7 Y OUT
8 VIDEO G
9 N.C
10 GND
Pin No. Signal Name
1 SIG R 1
2 A
3 SIG G 1
4 POWER SW
5 SIG B 1
6 ENTER
7 INT H
8 VIDEO/XPC IN
Pin No. Signal Name
9 GND
10 GND
11 B
12 COM R
13 C
14 COM L
15 SIG CEN
16 P SIG B
White (100%)
approx.
0.3 V
approx.
0.7 V
approx.
0.3 V
• When color bar signals are entered
Red
Burst signal (flat)
Horizontal sync signal
Fig. 3-1. Pattern generator's color bar signals
Signal mode
H V HDISP VDISP
(kHz) (Hz) (dots) (dots)
PC98 24.82 56.41 640 400
VGA-TEXT 31.47 70.08 640 362
VGA-GRAP 31.47 59.94 640 480
VGA72 37.86 72.82 640 480
VGA75 37.50 74.99 640 480
MAC13’ 35.00 66.67 640 480
VGA85 43.27 85.01 640 480
SVGA56 35.16 56.26 800 600
SVGA60 37.88 60.32 800 600
SVGA72 48.08 72.19 800 600
SVGA75 46.88 75.01 800 600
SVGA85 53.68 85.07 800 600
MAC16’ 49.73 74.55 832 624
XGA60 48.36 59.99 1024 768
VIDEO
SG
AUDIO
SG
Set PC
DC 8.4V
suitable
DD-107 board
(J701)
AUDIO/VIDEO terminal
YC-148 board
(J1002)
RGB terminal
MA-324 board
(J101)