Sony LBT-G3000 Service Manual page 12

2. Turn the adjustment screw and check output peaks. If
the peaks do not match for L-CH and R-CH, turn the
adjustment screw so that outputs match within 2 dB of
peak.
within
2 dB
within
output 208
level "
—= screw position
L-CH R-CH
peak peak
Screen pattern
in phase 45° 90° 135° 180°
a od
good wrong
3. After the adjustments, apply suitable locking compound
to the parts adjusted.
Adjustment Location :
Adjustment screws
REC/PB head (deck B)
or PB head (deck A)
Tape Speed Adjustment | DECK A| | DECK B
Procedure :
Mode: Playback
test tape
WS-48B
(3kHz, OdB)
frequency counter
O+
Al
CNQ11 (Pin@: L-CH)
(Pin @: R-CH)
— set
1. Short pin CN912 on set "DUBBING SPEED" switch to
"HIGH". Then at HIGH speed mode.
2. Adjust RV901 so that the frequency counter reads 6,000 +
20Hz.
Normal speed adjustment
Procedure:
Mode: Playback
test tape
P-4-L300
(315Hz, OdB) VTVM
(Pin @: L-CH)
(Pin @: R- aN eae
\
Adjustable limits :
CN911 PB
level: 366.7 to 411.4mV
(—6.5 to —5.5dB)
level difference between the channels: within +1dB
Adjustment Location : main TC board
Procedure :
1. Mode: record
CS-123
Foood t la HO
e110 ome) Eee ey
,
CN902 (Pin is L-CH)
(Pin @: R-CH)
1) 315Hz
2) 10kHz ! 32.7mV (—27.5dB)
2. Mode: Playback
recorded
portion VTVM
_ E
CN911 (Pin@: L-CH)
(Pin @: R-CH)