1-28 (No.52114)
4.7
ADJUSTMENT PROCEDURE
4.7.1
CHECK ITEM
4.7.2
TUNER / IF CIRCUIT
Item
Measuring
instrument
Test point
Adjustment part
Description
B1 POWER
SUPPLY check
DC voltmeter S1 Connector
(TP-E &
TP-91(B1))
(1) Receive the black-and-white signal. (color off)
(2) Connect the DC voltmeter to the TP-E and TP-
91(B1) of S1 connector.
(3) Confirm that the voltage is DC134.5V±2V.
S1
TP-91
(B1)
TP-E
1
5
3
( )
Connector
Item
Measuring
instrument
Test point
Adjustment part
Description
IF VCO
Signal
generator
Remote
control unit
[10.VCO]
CW TRANSF.(T111)
[MAIN PWB]
• It must not adjust without signal
(1) Receive color bar signal.
(2) Enter the SERVICE MENU.
(3) Select the 10.VCO.
(4) Push the [VOL
/
] key, and select the MAIN.
(5) Confirm that the color change from HIGH LEVEL to
LOW LEVEL by CW TRANSF at MAIN PWB, and
check the SYNC : YES.
(6) Adjust until REFERENCE LEVEL mark turns green.
And then confirm that the SYNC : YES again.
(7) Press the [EXIT] key to get out SERVICE MENU.
RF AGC
Remote
control unit
[1.V/C (S)]
S45: AGC ADJ
(1) Receive a black and white signal (color off).
(2) Enter the SERVICE MENU.
(3) Select < S45 > (AGC ADJ) of the 1. V/C(S).
(4) Press the [MUTING] key and turn off color.
(5) With the [VOL
] key to get the noise in the screen
picture (zero side of setting value).
(6) Press the [VOL
] key several times and step when
noise disappears from the screen (at that time, not to
increase the value too much).
(7) Change to other channels and make sure that there
is no irregularity.
(8) Press the [EXIT] key and get color out.
TUNER MAIN
HIGH LEVEL
REFERENCE LEVEL
LOW LEVEL
SYNC : YES
GREEN
Adjustment item
S45: AGC ADJ
Initial setting value
63
Summary of Contents for AV-27FA44/ASA
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