Bias Consumption Current Adjustment [Deck-B] Uo; Record Bias Adjustment |Deck-B; Record Level Adjustment Deck-B] - Sony TC-WE405 Service Manual
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Also See for TC-WE405:
- Operating instructions manual (60 pages) ,
- Operating instructions manual (16 pages) ,
- Operating instructions manual (16 pages)
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Bias Consumption Current Adjustment
|DECK-B
(TC-WE405 only)
This adjustment should be performed when replaycing the head
assy or the bias oscillating transformer (T341, T441).
Procedure :
blank tape
as:
CS-413 ,
digital voltmeter
ij
set
>
LINE IN
no signal
Connect the digital voltmeter to test point TP341.
Set RV341 (L-CH) and RV441 (R-CH) to mechanical center.
Set to FWD record mode..
Adjust T341
(L-CH) and T441
(R-CH) so that the digital
voltmeter reading becomes minimum.
Pe
Adjustment level : Maximum 220 mV
Adjustment level : MD board
Record Bias Adjustment |DECK-B
Setting :
REC LEVEL control : standard record position
(Refer to page 6.)
Procedure :
1.
Mode : record
AF OSC
blank tape
oe
CS-123
q
attenuator
y
aH
a ces:
LINE IN
1) 315Hz
V (-23.8dB)
Mi 10kHz } somv (
2. Mode : Playback
recorded
level meter
portion
LINE OUT
Confirm
playback
the signal recorded in stepl become
adjustment level as follows. If these levels do not adjustment
level the RV341
(L-CH) and RV441 (R-CH) to repeat step 1
and 2.
Adjustment level :
The playback output of 10 kHz level difference should be + 0.5
dB.
AdjustmentLocation : MD board
Record Level Adjustment | DECK-B
Setting :
REC LEVEL control : standard record position
(Refer to page 6.)
Procedure :
1.
Mode : Record
AF OSC
blank tape
lini
CS-123
i)
attenuator
y
oo
oe
If ooo
ed
315Hz, 50mV (-23.8dB)
2.
Mode : Playback
recorded
portion
level meter
Confirm playback the signal recorded in step 1 become
adjustment level as follows.
If necessary, adjust RV101
(L-CH) and RV201
(R-CH) to
repeat the step 1 and 2.
Adjustment level : —23.8 + 0.5 dB (47.2 to 53.0 mV)
Adjustment Location : MAIN (A) board
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