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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.
L-CH
peak
within 1dB
R-CH
screw
Peak
position
ete
L-CH
RCH"
~*~
Screw
peak
peak
position
3.
Mode : Playback
test tape
P-4-A100
main board
(10kHz, -10dB)
CN307
Pin @(L-CH) - oscilloscope
: Pin @ (GND)
Pin @ (R-CH)
Waveform of oscilloscope
inphase
45°
135"
180"
180°
oii
pnese
49
wrong.
good
4,
After the adjustments, apply suitable locking compound to -
the parts adjusted.
Adjustment Location :
SPR)
Geer
Adjustment screws
REC/PB head (deck B)
or PB head (deck A)
Tape Speed Adjustment
Procedure :
Mode : Playback
test tape
WS-48B
R
(8kHz, 0dB)
frequency counter
——
set
\
main board
CN307_ Pin @ (L-CH)
Pin @ (R-CH) |
1.
Insert the WS-48B to the deck B, and playback.
2.
Adjust the RV380 so that the reading of the frequency
counter will become 3000 + 10 Hz.
3.
Stop the deck B,:and insert the WS-48B
to the deck A,
playback. Be sure to check that the difference of the
frequency compared with the deck B becomes within +2%
and —0.5%.
.
4.
Insert the CS-123 (blank tape) to the deck A and insert the
WS-48B to the deck B, then playback them simultaneously.
Be sure to check that the reading of the deck B's frequency
counter becomes 3000 + 50 Hz.
Adjustment Location : main board
Playback Level Adjustment [ DECK A |
es
Procedure :
Mode : Playback
test tape
P-4-L300
(315Hz, OdB)
level meter
Sn
set
\
main board
CN307
Pin @ (L-CH)
Pin ® (R-CH)
Deck A is RV301 (L-CH) and RV401 (R-CH),
Deck B is RV302 (L-CH) and RV402 (R-CH)
so that adjustment within adjustment level as follows.
Adjustment level :
CN307 PB level: 301.5 to 338.3 mV (—8.2 to —7.2 dB)
level difference between the channels: within +0.5 dB
Adjustment Location : main board
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