JVC AV-27F704/BSA Service Manual page 45

4.7 ADJUSTMENT PROCEDURE
4.7.1 CHECK ITEM
Measuring
Item
instrument
B1 POWER DC voltmeter [S1] or [B1]
SUPPLY check
4.7.2 TUNER / IF CIRCUIT
Measuring
Item
instrument
IF VCO Signal
generator
Remote
control unit
TUNER
HIGH LEVEL
REFERENCE LEVEL
LOW LEVEL
SYNC :
RF AGC Remote
control unit
Adjustment item
S45: AGC ADJ
1-28 (No.52113)
Test point Adjustment part
Connector
(TP-E &
TP-91(B1))
Test point Adjustment part
[10.VCO]
CW TRANSF.(T111)
[MAIN PWB]
MAIN
GREEN
YES
[1.V/C (S)]
S45: AGC ADJ
Initial setting value
63
Description
(1) Receive the black-and-white signal. (color off)
(2) Connect the DC voltmeter to the TP-E and TP-
91(B1) of S1 or B1 connector.
(3) Confirm that the voltage is DC134.5V±2V.
Model name
AV-27F704
B1
AV-32F704
S1
AV-36F704
Description
• 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.
(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.
Connector
TP-91 TP-E
( )
(B1)
3 1
TP-91 TP-E
( )
(B1)
5 3 1