XR-C6093SP - Sony Car Audio Service Manual (repair manual). Page 14

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Procedure:
1. Put the set into the FWD PB mode.
2. Adjust adjustment resistor for inside capstan motor so that the
reading on the speed checker or frequency counter becomes in
specification.
Specification: Constant speed
Adjustment Location: See page 17.
DOLBY Level Adjustment
Setting:
Preset
[3]
(DOLBY) button
: NR OFF
SEL (BAS) button
: Center
SEL (TRE) button
: Center
SEL (BAL) button
: Center
SEL (FAD) button
: Center
SEL (VOL) button
: Maximum
D-BASS control
: OFF
Procedure:
1. Put the set into the FWD PB mode.
2. Adjust RV121 (L-CH) and RV221 (R-CH) so that the level
meter reading is –6 ± 0.5 dB (0.37 to 0.41 V).
Adjustment Location: See page 17.
See the adjustment location from on page 17 for the
adjustment.
Tape Speed Adjustment
Setting:
Speed checker
Frequency counter
–2 to +3%
2,940 to 3,090 Hz
4. Repeat the above adjustment for the REV PB mode.
5. Check that output level difference between FWD PB mode
and REV PB mode is within 4 dB.
Adjustment Location: PB head
REV         FWD
adjustment screws
+
speed checker
or
frequency counter
test tape
WS-48A
(3 kHz, 0 dB)
speaker out terminal
set
+
level meter
MAIN board
L-CH: TP101 (DOLBY-L)
R-CH: TP201 (DOLBY-R)
 
test tape
P-4-D400
(400 Hz, 0 dB)
set
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