Boss Audio Systems HC 700 Service Manual

1MZ-G750/R700SERVICE MANUALFM/AM PORTABLE MINIDISC RECORDERModel Name Using Similar Mechanism NEWMechanism Type MT-MZR700-172Optical Pick-up Name LCX-

10MZ-G750/R7003-7. HOLDER ASSY2Remove two solders of DC motor (over write head up/down) (M603).1Remove four solders of DC motor (sled) (M602).3Remove

11MZ-G750/R7004two screws(M1.4), precision pan5moter, DC (sled) (M602)3Remove four solders of motor flexible board.1washer (0.8 - 2.5)2gear (SA)1

12MZ-G750/R7002 In the normal mode, turn on the [HOLD] switch. While press-ing the [VOL --] key press the following order:> t > t . t . t > t

13MZ-G750/R7004-5. Configuration of Test Mode4-6. Manual ModeMode to adjust or check the operation of the set by function.Normally, the adjustment in

14MZ-G750/R7004-8. Self-Diagnosis Result Display ModeThis set uses the self-diagnostic function system in which if anerror occurred during the recordi

15MZ-G750/R700• Description of Indication HistoryHistory code number Description1 The first errorN The last errorN1 One error before the last.N2 Two e

16MZ-G750/R7004-11. Key Check ModeThis set can check if the set and remote commander function nor-mally.• Setting Method of Key Check Mode1. Setting t

17MZ-G750/R7004. When all the keys on the set and on the remote commander areconsidered as OK, the following displays are shown for 4 sec-onds.Example

18MZ-G750/R700• Setting method of NV reset1. Select the manual mode of the test mode, and set item number021NV Reset (see page 13).2. Press the X key.

19MZ-G750/R700• Adjustment method of Vc PWM Duty (L)(item number: 762)1. Connect a digital voltmeter to the TP901 (VC) on the MAINboard, and adjust [V

2Flexible Circuit Board Repairing• Keep the temperature of the soldering iron around 270°Cduring repairing.• Do not touch the soldering iron on the sa

20MZ-G750/R7002. Press the . key continuously until the optical pick-upmoves to the most inward track.3. Open the cover and set the laser power meter

21MZ-G750/R7005-8. Overall Adjustment Mode• Configuration of overall adjustmentNote: Adjust the CD first, when performing adjustment.Adjustment/checki

22MZ-G750/R7008. If OK through the overall MO adjustments, press the x keyto return to the test mode and terminate the Overall Adjustmentmode.6. Inser

23MZ-G750/R7005-9. Resume ClearPerform the Resume clear when all adjustments completed.• Resume Clear Setting Method1. Select the manual mode of the t

24MZ-G750/R70012. Adjust with the [VOL+] key (adjusted value up) or [VOL--]key (adjusted value down) so that the adjusted value becomes8B.13. Press th

25MZ-G750/R70025. Press the X key.(0D61 is blinking)26. Press the [VOL+] key once to change the blinking portion to0D62.27. Press the x key.(00 is bli

26MZ-G750/R70012. Press the X key.(0D5E is blinking)13. Press the [VOL+] key to change the blinking portion to 0D61.14. Press the x key.(00 is blinkin

27MZ-G750/R70048. Press the X key.(0D6E is blinking)49. Press the [VOL+] key to change the blinking portion to 0D72.50. Press the x key.(00 is blinkin

28MZ-G750/R70060. Press the X key.(0D65 is blinking)61. Press the [VOL+] key once to change the blinking portion to0D75.62. Press the x key.(00 is bli

29MZ-G750/R700SECTION 6DIAGRAMS6-1. IC PIN FUNCTION DESCRIPTION• IC501 SN761057DBT (RF AMP, FOCUS/TRACKING ERROR AMP)Pin No. Pin Name I/O Description1

31. SERVICING NOTE... 42. GENERAL Looking at the Controls (MZ-G750)...

30MZ-G750/R700• IC801 CXD2671-204GA (SYSTEM CONTROLLER, DIGITAL SIGNAL PROCESSOR, 16M BIT D-RAM)Pin No. Pin Name I/O Description1 PAUSE KEY I Set key

31MZ-G750/R700Pin No. Pin Name I/O Description52 AVD2 — Power supply terminal (for the analog) (+2.4 V)53 AVS2 — Ground terminal (for the analog)54 AD

32MZ-G750/R700Pin No. Pin Name I/O Description99 SLDW OSled motor drive signal output (W) to the motor driver (IC551)/drive control signaloutput (2+)1

33MZ-G750/R700Pin No. Pin Name I/O Description170 OPEN CLOSE SW IOpen/close detection switch (S806) of the upper panel input terminal (A/D input)“L”:

34MZ-G750/R700Pin No. Pin Name I/O Description224 – 226 (XAVLS), (SOUND 1, 2) I Not used (open)227 XHOLD SW I HOLD switch input terminal “L”: hold

MZ-G750/R70035 3533 248135 25 80TRACKINGCOIL DRIVE10 19 828 18 83FOCUSCOIL DRIVE14 17421623398SLED VOLTAGEMONITERSPINDLESERVODRIVESWITCHIC805411220 97

MZ-G750/R70036366-3. BLOCK DIAGRAM — AUDIO SECTION —913211431271AUDIOI/FCONTROLLERAUDIOI/FCONTROLLERCLOCKDIVIDEROPT CONTROLSWITCHQ302A/DCONVERTER&

MZ-G750/R70037 37187206205113142271702303481020861025169236235234171819S805(HALF LOCK)1521141164165811393612343250334756545255132553534681215213110911

MZ-G750/R70038381ABCDEFGHIJ234567891011121314OPTICALPICK-UPBLOCK(LCX-4R)R1011C1003L1005R1042 R1001 R1016R1023C1004R1007R1008R1005C1002R1035L906L602R60

MZ-G750/R70039 391ABCDEFGHIJ234567891011121314L1004L554MDMECHANISMSWITCH&LCD MODULE UNITHR601OVERWRITEHEADL553L1003L1002D201D101D602D901CN801D903D

4MZ-G750/R700SECTION 1SERVICING NOTENOTES ON HANDLING THE OPTICAL PICK-UPBLOCK OR BASE UNITThe laser diode in the optical pick-up block may su

MZ-G750/R7004040Common note on Schematic Diagram:• All capacitors are in µF unless otherwise noted. pF: µµF50 WV or less are not indicated except for

MZ-G750/R70041 41123487651 2 3 48 7 6 5434241403938373635343332313029123456789101112131444454647484950515253545556282726252423222120191817161543424140

MZ-G750/R7004242122184183 181 180 179182 178 176 175 174177 172 171 170 163164165 160161162 159 156157158 155 152153154 151 148149150 147 144145146 14

MZ-G750/R70043 436-8. SCHEMATIC DIAGRAM — MAIN SECTION (3/3) — • Refer to page 44 for IC Block Diagrams.3 2 1451123123 1321920212223241211109871 2 3

MZ-G750/R7004444• IC BLOCK DIAGRAMSIC501 SN761057DBT1TEREXTWpp LPFVREFCDD-CIyIxJxJyAA-CBADIP-INFEABCDOFC-1OFC-2PSLPEQAGNDRF OUTCCSL2VCXRSTSCKSBUSVREF0

45MZ-G750/R7002930313233343536373839404142434445464748495051525455561532 3 4 5 6 7 8 9 10 11 12 13 141516171819202122242325262728VBBATMCHGSWRSINP2INM2

46MZ-G750/R700V REFMTSWBSTSWBEEP19202122232418 17 16 15 14 13PWSW12111087BST19BST2654321BSTAGCPWBPWAADDTCMTVCCIN RIN LOUTBOUTA+BOUT LPW GNDOUT RDETAGC

47MZ-G750/R700SECTION 7EXPLODED VIEWSNOTE:• The mechanical parts with no referencenumber in the exploded views are not supplied.• Items marked “*” are

48MZ-G750/R7005152555453565758595660MT-MZR700-1727-2. CHASSIS SECTIONRef. No. Part No. Description Remark Ref. No. Part No. Description Remark@51 X-33

49MZ-G750/R700M603M601M602101102105106107108109115121120119118117103104110122111109112103109114113115109116103AABB7-3. MD MECHANISM DECK SECTION(MT-MZ

5MZ-G750/R700SECTION 2GENERALThis section is extracted frominstruction manual.(MZ-G750)

50MZ-G750/R700SECTION 8ELECTRICAL PARTS LISTNOTE:• Due to standardization, replacements inthe parts list may be different from theparts specified in t

51MZ-G750/R700Ref. No. Part No. Description Remark Ref. No. Part No. Description RemarkMAINC521 1-125-777-11 CERAMIC CHIP 0.1uF 10% 10VC522 1-125-777-

52MZ-G750/R700Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark@Replacement of CXD2671-204GA (IC801) used inthis set requires

53MZ-G750/R700Ref. No. Part No. Description Remark Ref. No. Part No. Description RemarkMAINQ302 8-729-046-49 FET FDV304PQ501 8-729-922-10 TRANSISTOR

54MZ-G750/R700Ref. No. Part No. Description Remark Ref. No. Part No. Description RemarkMAINR837 1-218-990-11 SHORT 0R839 1-208-939-11 METAL CHIP 150K

55MZ-G750/R700Ref. No. Part No. Description RemarkThe components identified bymark 0 or dotted line with mark0 are critical for safety.Replace only wi

56MZ-G750/R700REVISION HISTORYClicking the version allows you to jump to the revised page.Also, clicking the version at the upper right on the revised

6MZ-G750/R700(MZ-R700)

7MZ-G750/R700Set Panel Assy,LowerPanel Assy, Upper LCD ModuleMain Board MD Mechanism DeckService Assy, OPMotor Flexible BoardHolder AssyMotor, DC (M60

8MZ-G750/R7003-3. LCD MODULE3-4. MAIN BOARD1screws (1.7x2.5)4LCD moduleclawspanel assy, upper2screws (1.7x2.5)33screws (M1.4x2)6Remove the solders79Re

9MZ-G750/R7003-5. MD MECHANISM DECK3-6. SERVICE ASSY, OP1screws (1.4x1.6), MI2chassis assy, set3MD mechanism deckbossboss4spring(s), pack6spring,