Read Sony MDS-JB940 Service Manual online
18
4-5. SELECTING THE TEST MODE
There are 25 types of test mode as shown below. The groups can be switched by turning the l AMS L knob.
All of the service adjustments and checks can be performed in the test modes of Service group.
There is also the Develop group, but it is not used for service. If the Develop group is set by mistake, immediately press the MENU/NO
button to release the group.
All of the service adjustments and checks can be performed in the test modes of Service group.
There is also the Develop group, but it is not used for service. If the Develop group is set by mistake, immediately press the MENU/NO
button to release the group.
• For details of each adjustment mode, refer to “5. Electrical Adjustments” on page 22.
• For details of “Err Display” (C02), refer to “Self-Diagnosis Function” on page 4.
• If a different mode has been selected by mistake, press the MENU/NO button to release that mode.
• Modes with (×) in the Mark column are not used for servicing and therefore are not described in detail. If these modes are set accidentally,
press the MENU/NO button to release the mode immediately. Be especially careful not to use a test mode of Develop the unit will not
operate normally.
operate normally.
Display
AUTO CHECK
Err Display
TEMP ADJUS
LDPWR ADJUS
Iop Write
Iop NV Save
EF MO ADJUS
EF CD ADJUS
FBIAS ADJUS
AG Set (MO)
AG Set (CD)
TEMP CHECK
LDPWR CHECK
EF MO CHECK
EF CD CHECK
FBIAS CHECK
ScurveCHECK
VERIFYMODE
DETRK CHECK
0920 CHECK
Iop Read
Iop Compare
ADJ CLEAR
INFORMATION
CPLAY 1 MODE
CREC 1 MODE
No.
C01
C02
C03
C04
C05
C06
C07
C08
C09
C10
C11
C12
C13
C14
C15
C16
C17
C18
C19
C25
C26
C27
C28
C31
C34
C35
Contents
Auto self-diagnosis
Error history display/delete
Temperature compensation offset adjustment
Laser power adjustment
IOP data writing
The current IOP value is read by the microprocessor and written into non-
volatile memory.
volatile memory.
Traverse (MO) check
Traverse (CD) check
Focus bias adjustment
Focus tracking gain adjustment (MO)
Focus tracking gain adjustment (CD)
Temperature compensation offset check
Laser power check
Traverse (MO) check
Traverse (CD) check
Focus bias check
S-curve check
Non-volatile memory check
Detrack check
Outermost circumference check
IOP data display
Comparison with initial IOP value written in non-volatile memory
Initialization of adjustment value in non-volatile memory
Display of version of microprocessor, etc.
Continuous playback mode
Continuous recording mode
Service
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
Check
a
a
a
a
a
a
a
a
a
a
a
a
a
a
Group
Mark
×
×
×
×
×
×
×
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