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TEST MODE
[COLD RESET]
• The cold reset clears all data including preset data stored in the
RAM to initial conditions. Execute this mode when returning
the set to the customer.
Procedure:
1. Turn ON the power.
[DSG]
2. Press three buttons of
x
,
, and
CD X
simultaneously.
3. The set is reset.
[LIQUID CRYSTAL DISPLAY ALL LIT CHECK
MODE]
Procedure:
1. Set to standby state.
[DSG]
2. Press three buttons of
x
,
, and
[PLAY MODE/TUNING MODE]
simultaneously.
3. Liquid crystal display are all turned on.
4. To exit from this mode, press the
I/1
button to turn the power
OFF.
[TAPE DECK AGING MODE]
This mode can be used for operation check of tape deck section.
Procedure:
1. Set a tape in the tape deck.
2. Set to standby state.
[DSG]
[CD SYNCHRO]
3. Press three buttons of
x
,
, and
multaneously.
4. The aging is executed in bellow sequence.
5. To exit from the aging mode, press the
I/1
button to turn the
power OFF.
Aging mode sequence:
Start
Shut off
FWD Play
1 minute
REC pause for 3 seconds
Shut off
FWD REC
3 minutes
Fast forward
Shut off
REV Play
1 minute
REC pause for 3 seconds
Shut off
REV REC
3 minutes
Rewind
SECTION 4
[CD AGING MODE]
This mode can be used for operation check of CD section.
Procedure:
1. Load a CD disc.
2. Set to standby state.
[DSG]
[REPEAT/FM MODE]
3. Press three buttons of
x
,
, and
taneously.
4. The aging is executed in bellow sequence.
5. To exit from the aging mode, press the
I/1
power OFF.
Aging mode sequence:
Start
Open the disc tray
Close the disc tray
Play the last track
si-
[CHANGE-OVER MD/VIDEO]
Procedure:
1. Set to standby state.
[DSG]
[FUNCTION]
2. Press the
and the
buttons simultaneously.
3. The function change over to MD or VIDEO by turns.
[CHANGE-OVER THE AM TUNING INTERVAL]
(Except AEP and UK models)
• The AM tuning interval can be changed over 9 kHz or 10 kHz.
Procedure:
1. Press the
I/1
button to turn the power ON.
2. Select the function "TUNER", and press the
button to select the "AM".
3. Press the
button to turn the power OFF.
I/1
4. Change over to 9 kHz:
[TUNING --]
[TUNER AM]
Press the
and the
neously.
Change over to 10 kHz:
[TUNING +]
[TUNER AM]
Press the
and the
neously.
DECK SECTION
0 dB=0.775 V
Note: Confirm each contents of this section first of all. If the results are
not satisfied, do the adjustment.
1. The adjustments should be performed with the rated power sup-
ply voltage unless otherwise noted.
2. The adjustments should be performed in the order given in this
simul-
service manual.
3. The adjustments should be performed for both L-CH and R-
CH.
button to turn the
REC Bias Adjustment
Procedure:
1. Mode: REC
FUNCTION: VIDEO
MAIN board
AUDIO IN (MD/VIDEO) jack (SJ302)
L-CH, R-CH
1) 315 Hz
2) 10 kHz
AF OSC
600 Ω
attenuator
2. Mode: Playback
recorded
portion
set
MAIN board
SPEAKER terminals (SJ301)
L-CH, R-CH
3. Confirm playback the signal recorded in step 1 become speci-
fied values as follows.
If these values are out of specification values, adjust the RV101
(L-CH) and RV201 (R-CH) on the TC board to repeat steps
1and 2.
Specified values: Playback output of 315 Hz to playback
output of 10 kHz: ± 0.5 dB
Adjustment Location: TC board
[TUNER AM]
– TC BOARD (Component Side) –
buttons simulta-
buttons simulta-
RV101 (L)
13
13
SECTION 5
ELECTRICAL ADJUSTMENTS
CD SECTION
Note:
1. CD Block is basically constructed to operate without adjust-
ment.
2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10 MΩ impedance.
4. Clean the object lens by an applicator with neutral detergent
when the signal level is low than specified value with the fol-
lowing checks.
5. Check the focus bias check when optical block is replaced.
Focus Bias Check
50 mV (– 23.8 dB)
blank tape
Procedure :
CN-123
1. Connect oscilloscope to TP (RF) and TP (VC) on the CD board.
2. Press the
I/1
set
the
Z CD
button to open the CD disc tray.
3. Put disc (YEDS-18) in and press the
back.
4. Confirm that oscilloscope waveform is as shown in the figure
below. (eye pattern)
level meter
A good eye pattern means that the diamond shape ( ) in the
center of the waveform can be clearly distinguished.
+
–
Checking Location:
– CD BOARD (Conductor Side) –
IC103
REC Bias
TP (VC)
Adjustment
RV201 (R)
HCD-M70
oscilloscope
(DC range)
BD board
TP (RF)
+
TP (VC)
–
button to turn the power on, and press
button to play-
CD N
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
level:
1.1 ± 0.2 Vp-p
TP (RF)
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