Sony MZ-R900 Service Manual - Page 12

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 automatically 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. 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 Setting Method of Test Mode There are two different methods to set the test mode: 1 Short SL801 (TEST) on the MAIN board with a solder bridge (connect pin 3 of IC801 to the ground). Then, turn on the power. All off - MAIN Board (Conductor Side) - Microcomputer version 003 V1.000 display Destination code 002 : Except US, Canadian models 003 : US, Canadian models 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 44 50 47 35 36 45 31 30 51 113 24 42 IC801 25 20 26 28 16 40 23 17 38 21 15 34 27 8 22 96 95 18 19 4 9 29 2 7 613 48 10 5 241 12 11 C801 C813 + C809 + C830 L801 SL801 (TEST) • 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 microcomputer 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 normal mode) 2 In the normal mode, turn on the [HOLD] switch. While pressing the [VOL --] key press the following order: >t>t.t.t>t . t> t . t X t X 12