Sony MZ-R900 Section Test Mode, Outline, Setting Method of Test Mode, Releasing the Test Mode

MZ-R900

SECTION 4

TEST MODE

Outline

•This set provides the Overall adjustment mode that allows CD and MO discs to be automatically adjusted when in the test mode. In this overall adjustment mode, the disc is discriminate between CD and MO, and each adjustment is automatically executed in order. If a fault is found, the system displays its location. Also, the manual mode allows each individual adjustment to be auto- matically adjusted.

•Operation in the test mode is performed with the set. A key having no particular description in the text, indicates a set key.

•For the LCD display, the LCD on the remote commander is shown, but the contents of LCD display on the set are same.

Setting Method of Test Mode

There are two different methods to set the test mode:

1Short SL801 (TEST) on the MAIN board with a solder bridge (connect pin 3 of IC801 to the ground). Then, turn on the

power.

– MAIN Board (Conductor Side) –

3	79	77	70	81	60	58
0	74	67	65	63	62	57	61
31 133 135 137				68	55	54	56
4	76	73	66		59	49	53	+	C830
					44	50	47
					35	36	45
					31	30	51	L801
					113	24	42
	IC801				25	20	26		C809
					28	16	40
					23	17	38		+
					21	15	34	C813
					27	8	22
					96	95	18	C801	SL801
					19	4	9
					29	2	7		(TEST)
					6	1	3
					48	10	5
					241	12	11

Operation in Setting the Test Mode

•When the test mode becomes active, first the display check mode is selected.

•Other mode can be selected from the display check mode.

•When the test mode is set, the LCD repeats the following dis- play.

Remote commander LCD display

All lit	888	BASS12
All off

Microcomputer

version 003 V1.000 display

Destination code

002 : Except US, Canadian models

003 : US, Canadian models

•When the X key is pressed and hold down, the display at that time is held so that display can be checked.

Caution: On the set having the microcomputer version 1.000, some adjusted values were set in the manual mode at the shipment, but these data will be cleared when the NV is reset. Therefore, on the set having the micro- computer version 1.000, change the adjusted values following the Change of Adjusted Values immediately after the NV was reset (see page 17).

Releasing the Test Mode

For test mode set with the method 1:

Turn off the power and open the solder bridge on SL801 (TEST) on the MAIN board.

Note: Remove the solders completely. Remaining could be shorted with the chassis, etc.

For test mode set with the method 2:

Turn off the power.

Note: If electrical adjustment (see page 17) has not been finished com- pletely, always start in the test mode. (The set cannot start in nor- mal mode)

2In the normal mode, turn on the [HOLD] switch. While press- ing the [VOL --]key press the following order:

>t > t . t . t > t

. t > t . t X t X

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