Sony TC-WR545 Service Manual page 8

Bias Consumption Current Adjustment (TC-WR545 only)
This adjustment should be performed when replacing the head assy
or the bias oscillating transformer (T81, T91).
Procedure :
():R-CH
a - digital
biank tape voltmeter
CS-413
| set a atl
LINE IN
ne signal
1..Connect the digital voltmeter to test point TP81.
2. Set RV81 (RV91) to mechanical center.
3. Set to FWD record mode.
4, Adjust T81 (T91) so that the digital voltmeter reading becomes
minimum. oe
Adjustment Value : Maximum 220mV
Adjustment Location : AUDIO board
Record Bias Adjustment
Setting :
REC LEVEL control : standard record position (Refer to page 7.)
Procedure :
1. Record Mode
AF OSC
blank tape
CS-123
foe | SI
} 38.8mV( — 260B)
LINE IN
1) 315Hz
2) 10KHz
2. Playback Mode .
VIVM
recorded
portion
ic
Confirm that the 1OkHz playback output is 0 + 0.5dB relative to the
315Hz output. If necessary, adjust RV81 (L-CH), RV9 1(R-CH) :
TC-WRS545, RV12 (L-CH), RV22 (R-CH) : TC-WR741 and
repeat the steps given above.
Adjustment Location ; AUDIO board
Record Level Adjustment
Setting :
REC LEVEL control : standard record position (Refer to page 7.)
Procedure :
1. Record Mode
AF OSC
blank tape
e CS-123
oO GVV——
o—o
— i>
2. Playback Mode
recorded VITVM
portion
ic
Confirm playback the tape recorded become adjustment level as
follows.
If necessary, adjust RV101(L-CH), RV201(R-CH) and repeat the
steps 1 and 2.
LINE OUT
Adjustment Value :
LINE OUT level: — 26 + 0.5dB (36.7 to 41.1mV)
Adjustment Location : MAIN board