Sony TCM-1000A - Tape Speed Adjustment; Record Bias Adjustment

TCM-1000A
Tape Speed Adjustment Record Bias Adjustment
Setting: : Procedure:
Power supply voltage: 2 V dc 1. Mode: record
VOL control: mechanical mid
Procedure: blank tape
Mode: FWD speed checker €) §942 3002 CS-121
LF we O attenuator
digital frequency ' oo
counter i
test
tape
awed
WS-48
(3 kHz, 0 dB)
earphones jack 2. Mode: playback
recorded
portion
Specification:
Speed checker Digital frequency counter
3,000 Hz +1% 2,970 — 3,030 Hz
earphones jack
3. Adjust the VOLUME control so that 1 kHz output
Adjustment Location: is 77.5 mV (—20 dB).
4. Confirm that 250 Hz and 6.3 kHz output is —4 +3
bush :
dB relative to 1 kHz output.
adjustment hole
5. If necessary, change the parttern connections and
repeat the steps given above.
. VTVM reading
high
Adjustment Location: main board
[MAIN BOARD]