Sony HTC-D159 - Normal Speed Adjustment; Playback Level Adjustment; Record BIAS Current Adjustment

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
1 dB
within
output 1B
level
4
—> screw position
L-CH R-CH
peak peak
Screen pattern
in phase 45° 135° 180°
uU—~——Y
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 |DECK A||DECK B
Procedure:
Mode : Playback
test tape
WS-48B
frequency
counter
(3 kHz, 0 dB)
— set
CN302 Pin @ (L-CH)
[CN411] Pin @(R-CH)
* High speed adjustment (Must be first Adjustment
B_ deck)
1. Short pin CNP311 [CNP407] on set “DUBBING”
speed switch to “HIGH”. Then at HIGH speed
mode.
2. Adjust RV371 [RV504] so that the frequency
counter reads 6,000 + 20Hz.
* NORMAL speed adjustment
1. Remove the short pin from CNP311 [CNP407]
on set “DUBBING” speed switch to “NORMAL”.
Then at NORMAL speed mode.
2.
Adjust
RV372
[RV505]
so
that
the
frequency
counter reads 3,000 + 10Hz.
(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
|DECK
A||DECK
B
Procedure:
Mode : FWD Playback
test eee
P-4-L300
(315 Hz, 0 dB) VTVM
ot a L- ay
Pin@: R- ca)
A, [CN405]
DECK-A
side
RV101
[RV400]
(L-CH),
RV201
[RV500]
(R-CH)
DECK-B
side
RV102
[RV401]
(L-CH),
RV202
([RV501]
(R-CH)
so
that
the
limits
below
are
satisfied.
Adjustable limits:
CN405
level
:
461.6
—
411.4mV
(—4.5~
—5.5dB)
level
difference
between
the
channels
:
within
1.0dB
(See
right
for
Adjusting
Parts
Location)
Record BIAS Current Adjustment |DECKB
Procedure:
l. Mode: record
Cc
anes blank tape
e3 CS-122
os atienuator
“TRO O OT
Ooi va OF 1 9
CN302 Pin@® (L-CH)
[CN411] Pin ©)(R-CH)
1) 315 Hz =
2) OWE) 4808 mV (—25 dB)
2. Mode: Playback
an i
CN302 ae (L-CH)
[CN411] Pin @ (R-CH)