Electrical Adjustments; Test Mode; Tape Deck Section - Sony XR-C8220R Service Manual

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TEST MODE

This set have the test mode function. In the test mode, FM Auto
Scan/Stop Level and MW Auto Scan/Stop Level adjustments can
be performed easier than it in ordinary procedure.
<Set the Test Mode>
1. Set the "power select" switch (S600) is "A (ON)" position.
2. Turn ON the regulated power supply. (The clock is displayed)
[OFF]
Note: Press the
button, if the clock is not displayed.
[4]
3. Push the preset button.
[5]
4. Push the preset button.
[1]
5. Press the preset button for more than two seconds.
6. Then the display indicates all lights, the test mode is set.
<Release the Test mode>
[OFF]
1. Push the button.
2. Return the "power select" switch (S600) to initially set posi-
tion.
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SECTION 6

ELECTRICAL ADJUSTMENTS

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See the adjustment location from on page 22 for the
adjustment.

TAPE DECK SECTION

Tape Speed Adjustment
Setting:
test tape
WS-48A
(3 kHz, 0 dB)
set
LINE OUT REAR jack (CN780)
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
Speed checker
–1.5 to +2.5%
Adjustment Location: See page 22.
Dolby Level Adjustment
Q Q
Setting: 3 6 7 1 3 1 5
[SHIFT]
button
[4]
Preset (PLAY MODE)
[5]
n
(n) buttons
SOUND (BAS) button
SOUND (TRE) button
SOUND (BAL) button
SOUND (FAD) button
SOUND (VOL) button
test tape
P-4-D400
TP (DOLBY-L)/
(400Hz, 0 dB)
TP (DOLBY-R)
set
Procedure:
1. Put the set into the FWD PB mode.
2. Adjust RV230 (L-CH) and RV240 (R-CH) so that the level
meter reading is –6±0.5 dB (0.37 to 0.41 V).
Adjustment Location: See page 22.
co
.
9 4 2 8
0 dB=0.775 V
speed checker
or
frequency counter
10 k Ω
– +
Frequency counter
2,955 to 3,075 Hz
0 5 8 2 9 9 4 2 8
: ON (light up SET UP and
PLAY MODE)
: NR off
: Center
: Center
: Center
: Center
: Maximum
MAIN board
level meter
+
–
m
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