Sony HTC-D259 - Page 5

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 1 dB of
peak,
within
1dB
within
output 1qB
level "
—> screw position
L-CH R-CH
peak peak
Screen pattern
inphase 45° 90° 135° 180°
ny
good wrong
3. After the adjustments, apply suitable locking compound
to the parts. adjusted,
Adjustment Location :
Adjustment screw
REC “PB head (deck B)
or PB head (deck A)
Tape Speed Adjustment.
Procedure :
Mode : playback
test tape
WS-48B frequency counter
(3 kHz, 0 dB)
fieets ol
— set
O+
CN101 Bee ech
Pin @ (R-CH)
¢ High speed adjustment (Must be first Adjustment B deck)
1. Push HIGH speed button.
2,
Adjust
RV71
so
that
the
frequency
counter
reads
6,000
+
30Hz,
e NORMAL speed adjustment
1. Push NORMAL speed button.
2. Adjust RV72 so that the frequency counter reads
3,000+ 15Hz,
(See right for Adjusting Parts Location)
Frequency difference between deck A and deck B the
beginning of the tape should be within 1%,
Playback Level Adjustment
Procedure:
test tape
P-4-L300
(315Hz, 0 dB)
pee
CN101 Pin@ (L-CH)
Pin @(R-CH)
VIVM
Mode : FWD playback
DECK-A side RV11 (L-CH), RV21 (R-CH)
DECK-B side RV11 (L-CH), RV21 (R-CH)
so that the limits below are satisfied.
Adjustable limits :
CN101 level: — 7.7 £0.5dB (0.48 — 0.67V)
level difference between the channels: within 1.0dB
(See right for Adjusting Parts Location)
Record BIAS Current Adjustment | DECK B
Procedure :
1, Mode: record
AFC OSC
blank tape
C7) CS-122
j attenuator
oo O H }6Se mas
——— 500 ©
CN101 Pin@ (L-CH)
Pin © (R-CH)
1) 315 Hz
2) 10 kHz ~ 30 dB (0.0245 V)
2. Mode: Playback
recorded
portion
VTVM
pas
CN101 A ey
Pin @(R-CH)
Playback the signal recorder in step 1.
Confirm that the 10kHz playback output is 0+0,5dB relative
to the 315Hz output. If necessary, adjust RV12 (L-CH), RV22
(R-CH) and repeat the steps given above,
(See right for Adjusting Parts Location)