Electrical Adjustments - Sony STR-DA7ES Service Manual

[IDLING CURRENT ADJUSTMENT]
Measuring Instrument:
Adjustment Procedure:
Channel Test point Adjustment element
FRONT L TP501
FRONT R TP551
CENTER TP652
SURROUND L TP701
SURROUND R TP751
SURR BACK L TP651
SURR BACK R TP601
Adjustment Location:
[AMP BOARD]
TP501
RV501
RV701
RV651
TP651
TP701
[OSD ADJUSTMENT]
Measuring Instrument:
Procedure:
1. Connect the frequency counter to check connector (TP201) of
the S VIDEO board.
2. Connect between Pin 3 to Pin 4 of TP201 by lead wire.
3. Adjust the respective adjustment element so that the frequency
counter read specification.
MODEL
Adj.
VA333ES
I
DA4ES, DA7ES
All models
II
4. After check, remove the lead wire connected in step 2.
Adjustment Location:
[S-VIDEO BOARD]
CT204
1
4
TP201
SECTION 5
ELECTRICAL ADJUSTMENT
Digital voltmeter
Adjust the respective adjustment elements so that the voltage (absolute value) across the corresponding
testpoints satisfies the specification.
Specification
RV501
RV551
RV652
RV701 4.0mV±0.5mV
RV751
RV651
RV601
TP551
TP652
RV551
RV652
VR601
VR751
TP601
frequency counter
Adjustment
element
CT202
NTSC
(CLOCK BOARD)
CT201
PAL
(CLOCK BOARD)
CT203
(S-VIDEO BOARD)
CT204
(S-VIDEO BOARD)
CT203
STR-DA4ES/DA7ES/VA333ES
TP751
S- VIDEO
BOARD
TP201
1
4
measurement
point
TP201
Pin 1
TP201
Pin 2
[CLOCK BOARD]
CT201
CT202
frequency counter
+
–
Shorting
Specification
3.579545MHz ±50Hz
4.433618MHz ±50Hz
3.57954MHz ±50Hz
7.20MHz ±0.01MHz
17