Sony TC-730 - Page 32

14. Record Level | Test Setup: (1) Deliver a 1 kHz signal of -60 dB (0.775 mV) to the
Same as Item 13 MIC jack.
Adjustment
(2)
(3)
Control/Switch Setting: Set the TAPE SPEED switch to 19 cm/s (7-2 ips).
Record volume control
pe bod Place the unit in the stereo-record mode.
ee specified position on page 25
(4) Adjust R127, R128, R227 and R228 so that the
VTVM reads 0 + 1 dB.
MONITOR switch ...............
R127 (L-CH forwardgun)
R227 (R-CH forward run)
R128 (L-CH reverse run)
R228 (R-CH reverse run)
Specification:
O+1dB..... Playback output at 19 cm/s
(7-1/2 ips) tape speed
O+2dB..... Playback output at 9.5 cm/s
(3-3/4 ips) and 4.8 cm/s (1-7/8
ips) tape speed
(5) When changing the TAPE SPEED switch to
9.5 cm/s (3-3/4 ips) and 4.8 cm/s (1-7/8 ips)
make sure that the VTVM reads 0 + 2 dB and
that the difference between L-CH and R-CH is
within 2 dB.
* The level difference between channels at
9.5 cm/s and 4.8 cm/s tape speed
Spouete trades rtac ae ee _... Within 2 dB
(6) When changing a mode from stereo to monaural,
* The level difference between stereo-record
make sure that difference between them is
within 1 dB.
mode and monaural-record mode
baila Siibdn a. Sha eae eoase aT brah oy within 1 dB
Note: The adjustment should be performed for
both L-CH and R-CH in forward and
reverse modes.
15. Idling Set the POWER AMP switch to ON.
Current
Test Setup: bs Reda
power amp circuit board
(2) Adjust R734 and R834 to obtain 20 mV on the
Adjustment VTVM
idling current
adjustment
R734
RIGHT ©
R834 |
Specification:
Voltage at checking point......
Note: Adjust as soon as possible since the POWER
AMP switch is set to ON.
— 34 —