Sony MHC-6800 Service Manual page 52

Playback Level Adjustment | DECK A DECK B
Procedure :
—Forward Playback Mode—
test tape
P-4-1300 vivm
(315Hz, OdB)
47ka
LINE OUT (CNJ401)
Adjust deck A: RV1LA (L-CH), RV21A (R-CH) and deck B:
RV11B (L-CH), RV21B (R-CH) so that the VTVM reading
becomes the adjustment limits below.
Adjustment Limits :
LINE OUT level: —7.5 + 0.54B (0.31 to 0.35V)
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-A Board
MD-B HX PRO Board
Tape Speed/playback Level Adjustment
Screwdriver to adjust the MD block
The MD block adjustment can be performed by insert:
ing a screwdriver of which axis length (not including
the shaft) is 35 mm or more through the rear side of
the main board.
MD-B HX PRO board
MD-A board
Record Bias Adjustment | DECK B
Procedure :
1. Record Mode
AF OSC
blank tape
C) nt 8-123
'O| _attenuator
lopeesnrgsege |
oto
sa oreze)
LINE IN (CNJ401)
1) 315Hz
3) Toate foe 7mV (—27.5dB)
2. Playback Mode
recorded
portion NINN
LINE OUT (CNJ401)
Playback the signal recorded in step 1.
Confirm that the 10kHz playback output is 0 + 0.5dB (0.732
to 0,821V) relative to the 315Hz output. if necessary. adjust
RV81 (L-CH), RV91 (R-CH) and repeat the steps given above.
Adjustment Location : MD-B HX PRO board
Record Level Adjustment | DECK B
Procedure :
1. Record Mode
AF OSC blank tape
C8123
C) 10k.
—
LINE IN (CNJ401)
315Hz, 32.7mV (—27.5dB)
2. Playback Mode
recorded VTVvM
portion
47kQ {
LINE OUT (CNJ401)
Confirm playback the tape recorded become adjustment level
as follows.
If necessary, adjust RV101 (L-CH), RV201 (R-CH) and repeat
steps 1 and 2.