Electrical Adjustments - Sony Glasstron Lite PLM-A35E Service Manual

Precautions on adjustment:
1. Perform the adjustment in the given order.
2. Power supply voltage: DC 9 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
(4) Digital voltmeter
(5) Frequency counter
(6) Connector for adjustment
4. Measurement points for adjustment are located at CN803 on
the RG-A01 board. The pin No. and signal name of CN803 is
listed below.
• RG-A01 Board, CN803
Pin No. Signal Name
1 GND
2 G OUT
3 B OUT
4 R OUT
5 GND
Preparation:
Connect electrical blocks as shown below.
pattern
generator
S VIDEO IN jack (J401)
or A/V IN jack (J402)
YM-A01 board
DC 9V
Regulated
power supply
DC IN 9 V jack (J101)
DD-A02 board
Note: In the adjustment where the S VIDEO input is designated, if ad-
justment was made with the VIDEO input. The specification of
this set will not be satisfied. Always follow the designation.
If adjustment was made using the VTR with S VIDEO OUT termi-
nal as a signal source, the performance of this set depends on that
VTR. Therefore, use the pattern generator with the Y/C separate
output terminals, if possible.
SECTION 3

ELECTRICAL ADJUSTMENTS

Pin No. Signal Name
6 HD
7 NC
8 NC
9 NC
10 NC
Connector for check (CN305)
YM-A01 board
Adjusting
Remote
Commander
Set
Extension cable
(J-6082-291-A)
5. Setting up Input Signals
(1) S VIDEO Signal
Connect an oscilloscope to the Y signal pin of the S VIDEO
IN connector, and check that the sync signal of Y signal is
approximately 0.3 V, video amplitude is approximately 0.7
V, and the setup level is 0 V. (If using the VTR with S VIDEO
OUT terminal, check further that the chroma signal and burst
signal do not remain.)
Also, connect an oscilloscope to the chroma signal pin of the
S VIDEO IN connector, and check that the burst signal am-
plitude of chroma signal is approximately 0.3 V and it is flat,
and moreover, the amplitude ratio of burst signal to "red"
signal is 0.30 : 0.66.
Setup level: Potential difference between black and pedestal
Y signal
White (75%)
approx.
0.53V
Pedestal
Chroma signal
Burst amplitude : chroma amplitude = 0.30 : 0.66
Fig. 3-1. Pattern generator's color bar signals
(2) 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
amplitude of video signals is approximately 0.3 V, the am-
plitude of video part is approximately 0.7 V, burst signal am-
plitude is approximately 0.3 V and flat, and the level ratio of
burst signal to "red" signal is 0.30 : 0.66.
White (75%)
approx.
0.53 V
approx.
0.3 V
Pedestal
Horizontal sync signal
Fig. 3-2. Pattern generator's color bar signals
3-1
White (100%)
approx.
Black
0.7 V
approx.
0.3 V
Horizontal
sync signal
Red
approx.
0.3 V
Burst signal
(to be flat)
White (100%)
approx.
0.7 V
Black
Red
Burst signal
(to be flat)
Confidential
PLM-A35E (AEP)
approx.
0.3 V