AIWA NSX-VC78 Service Manual
NSX-VC78
HR
SERVICE MANUAL
COMPACT DISC STEREO
CASSETTE RECEIVER
SYSTEM
NSX–VC78
• This Service Manual contains the additional information “CD TEST MODE”
for the model NSX-VC78 (HR). If requiring the other information, see
Service Manual of NSX-VC78 (HR), (S/M Code No. 09-006-431-0R1).
CD
CASSEIVER
BASIC TAPE MECHANISM : 2ZM-3MK2 PR4NM
BASIC CD MECHANISM : AZG-1 VZD3RDM
MAIN
SPEAKER
REMOTE
CONTROLLER
RC–ZAS07CX–NVC78 SX–WNSZ70
S/M Code No. 09-006-431-0S1
SUPPLEMENT
DATA
CD TEST MODE
1. How to Activate CD Test Mode
Insert the AC plug while pressing the function CD button.
All FL display tubes will light up, and the test mode will be
activated.
3. CD Test Mode Functions
When test mode is activated, the following mode functions from No.1 to No.5 can be used by pressing the operation keys.
2. How to Cancel CD Test Mode
Either one of the following operations will cancel the CD test
mode.
• Press the function button. • Press the power switch button.
(except CD function button) • Disconnect the AC plug
Mode/No.
Start mode
No.1
Search mode
No.2
Play mode
No.3
Traverse mode
No.4
Sled mode
No.5
Operation
Activation
9 key
1 2 key
key
;
fi key
fl
FL display
All lamps light
All lamps light
Operation
• Test mode is activated.
• CD block power is ON.
• Laser diode turns always ON.
• Continual focus search
(The pickup lens repeats the fullswing up-down motion.)
* Avoid continual searches that last for
more than 10 minutes.
* NOTE 1
• Normal playback
• Focus search is continued if TOC
cannot be read. * NOTE 1
• During normal disc playback
Press once; tracking servo OFF
Press twice; tracking servo ON
* NOTE 2
• Pickup moves to the outermost track
• Pickup moves to the innermost track
* NOTE 3
(During playback, machine operates
normally.)
Contents
• FL display check (All displays light.)
• APC circuit check
• Laser current measurement
(Laser current control. Across a
resistor connected between emitter
and GND.)
FOCUS SERVO
• Check focus search waveform
• Check focus error waveform
(FOK/FZC are not monitored in the
search mode)
FOCUS SERVO/TRACKING SERVO
CLV SERVO/SLED SERVO
Check DRF
TRACKING SERVO ON/OFF
Tracking balance (traverse) check
SLED SERVO
Check SLED mechanism operation
* NOTE 1: There are cases when the tracking servo cannot be locked owing to the protection circuit being operated when heat builds up
in the driver IC if the focus search is operated continually for more than 10 minutes. In these cases the power supply should be
switched off for 10 minutes until heat has been reduced and then re-started.
* NOTE 2: Do not press the fi or fl keys when the machine is in the
after the
status has been canceled. If the fi or fl keys are pressed in the ; status, press the 9 key and return to the start mode
;
status is active. If they are pressed, playback will not be possible
;
(No.1).
* NOTE 3: When pressing the fi or fl keys, take care to avoid damage to the gears. Because the sled motor is activated when the fi or fl
keys are pressed, even when the pick-up is at the outermost or innermost track.
4. Operation Outline
The operation of each mode is carried out in the direction of the arrows from the start mode as indicated in the following illustration.
No. 2 No. 3
1 2
No. 1
Start mode
(All FLs light up.)
2
Search mode
9
9
fi
fl
No. 5 No. 4
Sled mode
;
Play mode
9
1 2
;
;
9
Traverse mode
If the DISC DIRECT PLAY button is pressed, the machine performs the same operation as the PLAY button is pressed as shown. If
the tray is opened by pressing OPEN/CLOSE button during Play mode or Traverse mode, the machine returns to the Start mode.
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