Sony MDS-JB920 service manual Selecting the Test Mode, Display Contents Mark Group

5. SELECTING THE TEST MODE

There are 31 types of test modes as shown below. The groups can be switched by rotating the [ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± knob. After selecting the group to be used, press the [YES] button. After setting a certain group, rotating the [ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± knob switches between these modes. Refer to “Group” in the table for details selected.

All items used for servicing can be treated using group S. So be carefully not to enter other groups by mistake.

Display	No.	Contents	Mark		Group (*)
TEMP CHECK	C01	Temperature compensation offset check		C		S
LDPWR CHECK	C02	Laser power check		C		S
EF MO CHECK	C03	Traverse (MO) check		C		S
EF CD CHECK	C04	Traverse (CD) check		C		S
FBIAS CHECK	C05	Focus bias check		C		S
S curve CHECK	C06	S letter check	(X)	C
VERIFY MODE	C07	Non-volatile memory check	(X)	C
DETRK CHECK	C08	Detrack check	(X)	C
TEMP ADJUS	C09	Temperature compensation offset adjustment			A	S
LDPWR ADJUS	C10	Laser power adjustment			A	S
EF MO ADJUS	C11	Traverse (MO) adjustment			A	S
EF CD ADJUS	C12	Traverse (CD) adjustment			A	S
FBIAS ADJUS	C13	Focus bias adjustment			A	S
EEP MODE	C14	Non-volatile memory control	(X) (!)				D
MANUAL CMD	C15	Command transmission	(X)				D
SVDATA READ	C16	Status display	(X)				D
ERR DP MODE	C17	Error history display, clear				S
SLES MOVE	C18	Sled check	(X)				D
ACCESS MODE	C19	Access check	(X)				D
0920 CHECK	C20	Outermost circumference check	(X)				D
HEAD ADJUST	C21	Head position check	(X)				D
CPLAY2 MODE	C22	Same functions as CPLAY MODE	(X)				D
CREC2 MODE	C23	Same functions as CREC MODE	(X)				D
ADJ CLEAR	C24	Initialization of non-volatile memory of adjustment value			A	S
AG Set (MO)	C25	Auto gain output level adjustment (MO)			A	S
AG Set (CD)	C26	Auto gain output level adjustment (CD)			A	S
Iop Read	C27	IOP data display		C		S
Iop Write	C28	IOP data write			A	S
JB920 @@.@@	C29	Microprocessing version display		C		S
CPLAY MODE	C30	Continuous play mode		C	A	S	D
CREC MODE	C31	Continuous recording mode		C	A	S	D
			Group (*)			A: Adjust
			C: Check			D: Develop

S: Service

•For details of each adjustment mode, refer to “5. Electrical Adjustments”.

For details of “ERR DP MODE”, refer to “Self-Diagnosis Function” on page 2.

•If a different mode has been selected by mistake, press the [MENU/NO] button to exit that mode.

•Modes with (X) in the Mark column are not used for servicing and therefore are not described in detail. If these modes are set acciden- tally, press the [MENU/NO] button to exit the mode immediately. Be especially careful not to set the modes with (!) as they will overwrite the non-volatile memory and reset it, and as a result, the unit will not operate normally.

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