Sony TC-WR690 - Locating Selections with Multi-AMS; Automatic Music Sensor Function

Playback Level Adjustment
Procedure :
—Forward Playback Mode--
test tape
P-4-L300
(315kHz, OdB) AM
LINE OUT
Adjust each RV11 (L-CH) and RV21 (R-CH) so that the
VTVM reading becomes within adjustment limits below on.
both of deck A and deck B.
Adjustment Limits:
LINE OUT level: —7.7+0.5dB (0.301 to 0.338V)
Level difference between channels: within 0.5dB
Confirm the LINE OUT level does not change in playback
mode while changing the mode from playback to stop several
times.
Adjustment Location : MD HX board
Bias Consumption Current Adjustment
This adjustment should be performed when replacing the
head assy or the bias oscillating transformer (T81, T91).
Procedure : digital
blank
tape
voltmeter
LINE IN CS-412
no signal
set —-
1. Connect the digital voltmeter to test point TP81.
2. Set RV81 (L-CH) and RV91 (R-CH) to mechanical center.
3. Set to forward record mode.
4. Adjust T81 (L-CH) and T91 (R-CH) so that the digital
voltmeter reading becomes minimum.
Adjustment Location : MD HX board
Record Bias Adjustment
Setting :
REC LEVEL control: standard record position (Refer to
page 8.)
Procedure:
1. Record Mode
AF OSC biank tape
C) ieee CS$-122
oO
a 3
LINE IN
1) 315Hz _
5 arr} B1.6mv ( 27.8dB)
2. Playback Mode
recorded VTVM
portion
LINE OUT
3. Playback the signal recorded in step 1, and confirm that
the 10kHz playback output level is VTVM reading
becomes within adjustment limits below relative to the
315Hz output.
4, If the adjustment limits are not satisfied, adjust each
RV81 (L-CH) and RV91 (R-CH) so that the VT VM read-
ing becomes within adjustment limits below. —
Adjustment Limits:
10kHz playback output ©
relative to the 315Hz output: 0+£0.5dB
(0.732 to 0.821V)
Adjustment Location: MD HX board