Tascam DA 98 HR Service Manual

Page 1

TASCAM

TEAC Professional Division

SERVICE MANUAL

DA-98HR

Digital Multitrack Recorder

BEFORE RETURNING APPLIANCE TO THE CUSTOMER, MAKE LEAKAGE-CUR-
RENT OR RESISTANCE MEASUREMENTS TO DETERMINE THAT EXPOSED
PARTS ARE ACCEPTABLY INSULATED FROM THE SUPPLY CIRCUITI

INSTRUCTIONS FOR SERVICE PERSONNEL

Effective : October, 2000 4A3489

S-0029

Page 2

CONTENTS

1. SPECIFICATIONS : a aaaaaaaaaaaaa a a a aaaaaaaa s b a i 3
2. TECHNICAL INFORMATION a a a a a a v v s s aaaaaaaaaa 7
2-1. Activation of test mode ---------------------- 7
2-2. Activation of VTR mode --------------------- 7
2-3. Displaying ROM version numbers ~~~~~~~~~~~~~ 7
2-4. Displaying SUB MPU version numbers - ~ ~ ~ --7
2-5. Displaying the voltage of battery ~~~~~~~~~~~~~~ 7
2-6. Displaying the hed drum utilized time ---------- 7
2-7. Displaying the servo error history ~~~~~~~~~~~~~~ 7
2-8. KEY PCB check mode ----------------- - -8
2-9. How to use the built-in oscillator ~~~~~~~~~~~~~~~ 8
2-10. Removing the FRONT MPU ----------------- 8
2-11. Removing the SYS ROM -------------------- 8
2-12. Checking the optional lF-AN98HR (A/D board
and D/A board) ........................... 9
2-13. Changeover of Reference level ~~~~~~~~~~~~~~ 9
2-14. EXTERNAL CONTROL I/O ----------------- 12
3. ASSEMBLING THE MECHANISM ASS'Y » n r ~ a o o 19
3-1. Flowchart of assembling -------------------- 19
3-2. Installation of the mechanical parts ----------- 20
4. MECHANISM ADJUSTMENTS a o o v o n n ~~~~ a «««««« 26
4.1. Preparation ............................... 27
4.2_ Test tape ................................. 27
4-3. Adjusting the tension arm position ~~~~~~~~~~~~ 28
4-4. Adjusting the torque .........
4-5. Adjusting the tape travel -------------------- 29
4-6. Confirming the travel in F.FWD, REW and
FtEV mode ............................... 32
5. ELECTRICAL ADJUSTMENTS a a a a 35
5-1. Check and adjustment points ---------------- 35
5.2. Test tape ................................. 36
5.3_ +5 v suppjy check ......................... 36
5-4. P.G. (Phase generator) position adjustment ~~--36
5-5. Offset adjustment in the VCO free-running
frequency automatic compensation circuit ~~~~~ 37
5-6. Playback equalizer adjustment --------------- 38
57 RF jevej check ............................ 39
5-8. Playback error rate check ------------------- 40
5-9. Recording current adjustment ---------------- 41
5-10. Recording/playback RF level check ~~~~~~~~~~ 43
5-11. Recording/playback error rate check --------- 43
6. EXPLODED VIEWS AND PARTS LIST 0 oooooooooo 45
7. PC BOARDS AND PARTS LIST a a 9 ~ r b a a °°°°°°°° 53
8. INCLUDED ACCESSORIES aaaaaaaaaa s s nnnnnnnn 71

E &
1&1; .......................................... 3
2.5-7:7j)b4>77jx-=/3> ................... 7
2-1.7-2I~Je~ KNEE» ----------------------------- 7
2.2, VTRE~ Raga ............................... 7
2-3. Roman-93 yin? .......................... 7
24. SUB MPUO)I\'~/a yiéfi: .................... 7
2-5. It-yg-I}~0)%E§fi ........................... 7
2-6. FfiAEifitéfiflaFefimE/T: ---------------------- 7
2-7. #efilfiflfifiofifi ------------------------- 7
2-8. KEY P0891: ~y 7-6- l~" ........
2»9.WEE7J"*/l/~5I*®1§fifi7iiéi ------------------- 8
2-10. FRONT MPUVWI- [27:7 -------------------------- 8
2-11. svs ROMMi L75 ----------------------------- 8
2-12. 7T7") 3 / |F»AN98HR (A/D7I{~ F, D/A7I'3E F)
07'17 7j:jt,\( ........................... 9
Z13.J77I/PXI/NJLUJEEl10mT ............ 9
2-14. EXTERNAL CONTROL l/OlCDlAT ----------- 12
3. x 71 Ass'Yogfij .................. . . .19
3-1.$EI®7D-§-v~l~ .......................... 19
3-2. x figficfamyhw ------------------------------ 20
4_ gfigfigg ................................... 26
4.1137; ............................................ 27
4.2. 7-2 |~7-a7 ................................... 27
4-3. 7-7)? a >7Afifiéfig ..................... 28
4-4. |~Jlx7§fi§ ..................................... 28
4-5. 777iޤ޴ -------------------------------- 29
4-6. FF, REW, REV ea Fcoifiirfiig ------------ 32
5_ Efifiag ................................... 35
5-1. iflflififififiivEEEEFfi
5.2. 5-2 |~7-#7 .................................. 35
5-3, $fi+5v®§€§g ................................ 35
5-4. PG (Phase Generator) ffiifiéfifi ............... 35
5-5. V007 U -5 >l§li§§ifi§bfi£l§lfi§
(7)7t7tv béfig ------------------------------ 37
56. Eir 25477§fi¥ -------------------------- 38
57 RF l/Nlbfiggg .................................. 39
5-8. Eila-i/~ biz/Eat; .......................... 40
5-9. Eafififififiié ----------------------------------- 41
5-10. mm; RFI/ngézg ....................... 43
5»11.§B§ifi$I5#l/~ Hui/£33 ------------------- 43
sfifiglt/t-yuxp .......................... 45
Igfilt/t-yuzp .......................... 53
3_ fijgfi, ....................................... 71