Sony STR-AV880 - Electrical Adjustments

HD614022-FE59 (1C251)
49
50
51
SER
IN BUS
Output pin which
AM MODE | selects AM MODE
(R73) (STEREO or MONO)
“L”: STEREO
“H”: MONO (Not used)
ao
MUTING a muting output
a
a So =[=
MODE fue
IN (R92) Initialize. C
ET
)
RESET. Reset signal input pin
Clock ose signal input
pin.
Cock ost skeual inpui !
WaHUCR ov Sipilds alpuc {
IN OSC 2 :
pin.
- GND Ground.
Data signal bus input/
DATA : L
OUT (D0) output pin,
IN/ BUS Clock signal bus input/
OUT GEOEx output pin t
(D1) put pin.
IN AUTO STOP} Auto stop signal input L
(D2) pin. (Not used)
PROTECT- ‘
IN OR OUT aoe signal output L
(D3) «| Pu
FM STOP. | FM stop signal output
(D4) pin. (Not used)
PROTECT-
ORIN Protector signal input.
(D6)
2 | ot
ANT-A Output pin which selects
57
(D9) Antenna-A mode.
58 ANT-B Output pin which selects
(D10) Antenna-B mode,
| STR-AV880
STR-AV880
SPEAKER
RELAY
Speaker relay drive
signal output pin.
Relay drive signal
output pin for
MM/MC switching.
Power relay drive
signal output pin.
HI au
HI-BLEND
SECTION 1
ELECTRICAL ADJUSTMENTS
AM SECTION
Setting:
LAYOUT-FREE AM ANT
AM rf signal
generator
Put the lead-wire
antenna close to
the set.
g
30% amplitude
modulation by
400 Hz signal
REC OUT
e Repeat the procedures in each adjustment
several times, and the frequency coverage and
tracking adjustments should be finally done by
the trimmer capacitors.
AM Tracking Adjustment
This adjustment should be performed after com-
pleting AM Frequency Coverage Adjustment.
AM !F Alignment
Adjustment Reading on
part VTVM
SG and set
frequency
600 kHz T201
1,400 kHz CT201
SG and set Adjustment
frequency part
1000 kHz .- T211
VTVM
maximum a
Reading on |
maximum
iMAIN BOARD]
AM Frequency Coverage Adjustment
vom
(DC range)
test point
CV CHECK
set Adjustment
frequency part
§30 kHz T202
1,610 kHz CT202
AM SIGNAL LEVEL ADJUSTMENT
Reading on the
signal level
indicator of the set
90
SG and set
frequency
Adjustment
part
SG output
level
90 dB/m 1000 kHz RT201