Sony TCM-2 - Page 9

Record Bias Adjustment
Procedure:
1. Mode: record
af osc ;
blank tape
€) ie CS-10
O attenuator
oS
; HOO O°
ed |
MIC input jack
1) 1kHz
2) ge 77nV (-80 dB)
2. Mode: playback
recorded VTVM
portion
earphone jack
1) Play back the 1 kHz signal. Adjust the VOL-
UME knob to obtain 0.25 V (-10dB) reading on
the VTVM.
2) Play back the 6.3kHz signal. Adjust the pattern
connection ( @ or @or@) to obtain 0.18 —
0.35V (-13 — -7 dB) reading on the VTVM.
Repeat the procedures 1 and 2 for best results.
Adjustment Location: Audio Board
Microphone Sensitivity Adjustment
When replacing the microphone, perform this adjust-
ment.
BLACK SHORTED
RED OPEN
Adjustment Location: Audio Board
GRY)
WHT a
HRP9OI MIC90I
REC/PB HEAD C-1007A
BUILT-IN
MICROPHONE
6.3kHz
VTVM reading
pattern connection
down