Sony Tc Kb820s Manual

Ð 11 Ð
Tape Speed Adjustment
Procedure:
Mode: playback
1. Set to FWD playback mode.
2. Adjust RV71 so that the frequency counter reading becomes
3,000 ± 90 Hz.
3. If, the frequency counter reading does not become 3,000 ±
90Hz.
Turn RV72 and back to 1st. step again.
Note:Turn RV72 to clockwise Ð Tape speed becomes fast.
Turn RV72 to counter clockwise Ð Tape speed becomes slow.
4. Frequency difference between the beginning and the end of
the tape should be within 1%.
Adjustment Location: AUDIO board (See...

Ð 12 Ð
Record Level Adjustment
Setting:
REC LEVEL control: Standard Record (See page 10.)
Procedure:
1. Mode: record
2. Mode: playback
3. Adjust RV111 (L-CH) and RV211 (R-CH) so that the reading
on level meter meets the adjustment limits below.
Adjustment Limits: Ð3.8 ± 0.5 dB (0.47 to 0.53 V)
Adjustment Location: MAIN board
[AUDIO BOARD] ÐSIDE A Ð
set AF OSC
Attenuator
600 W
10 k W
CS-123
blank tape LINE IN
315 Hz, 0.5 V (–3.8 dB)
+–set
LINE OUT 47 k 
W
recorded
portionlevel meter
Adjustment...

Ð 13 ÐÐ 14 Ð
SECTION  5
DIAGRAMS
¥ Circuit Boards Location
TRANSFORMER board
AC POWER
SW board
HP board
PANEL board
LEAF SW board
REC VOL board
DOLBY-S boards
MAIN board
AUDIO board
5-1. NOTE  FOR  PRINTED  WIRING  BOARDS  AND  SCHEMATIC  DIAGRAMS
(In addition to this, the necessary note is each block.)
Note on Schematic Diagram:
¥ All capacitors are in µF unless otherwise noted.  pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
¥ All resistors are in W and 
1/4
 W or less...

Ð 15 Ð
Ð 16 Ð
TC-KB820S
5-2. PRINTED  WIRING  BOARDS  Ð MD Section Ð ¥ See page 13 for Circuit Boards Location.
¥ Semiconductor
Location
Ref. No. Location
D31 C-1
IC31 C-2
IC81 B-3
·IC81 G-4
Q51 B-2
Q52 B-2
Q53 B-2
Q71 C-4
(Note) ·:LEAF SW BOARD (Page 20)
(Page 19)
(Page 19) 

TC-KB820S
Ð 18 Ð Ð 17 Ð
5-3. SCHEMATIC  DIAGRAM  Ð MD Section Ð ¥ See page 27 for Waveforms.
(Page 21)
(Page 21)
(Page 23) 

Ð 19 ÐÐ 20 Ð
TC-KB820S
5-4. PRINTED  WIRING  BOARD  Ð MAIN Section Ð ¥ See page 13 for Circuit Boards Location.
¥ Semiconductor
Location
Ref. No. Location
D131 C-5
D132 C-5
D231 C-5
D232 C-5
D511 B-7
D512 B-7
D513 E-7
D551 B-5
D701 G-2
D702 G-2
D703 G-2
D704 G-2
D705 F-2
D706 F-2
D707 F-2
D708 G-3
D709 G-5
D710 F-3
D711 F-4
D712 F-3
D713 E-1
D714 E-3
D715 F-4
D801 D-2
D802 D-2
IC501 C-9
IC502 F-9
IC503 D-6
IC504 C-5
IC505 D-5
IC506 A-9
IC507 C-7
IC508 B-4
IC509 C-4
IC510 B-6
IC511 F-10
IC512 D-9
IC601...

TC-KB820S
Ð 22 Ð Ð 21 Ð
5-5. SCHEMATIC  DIAGRAM  Ð MAIN Section Ð (1/3)
(Page 30)
(Page 34)
(Page 18)
(Page 18)
(Page 30)
(Page 23)(Page 23)
The components identified by mark ! or dotted
line with mark ! are critical for safety.
Replace only with part number specified. 

Ð 23 ÐÐ 24 Ð
TC-KB820S
5-6. SCHEMATIC  DIAGRAM  Ð MAIN Section Ð (2/3) ¥ See page 27 for Waveforms.
(Page 22)
(Page 22)
(Page 18)(Page 25) (Page 25) 

TC-KB820S
Ð 26 Ð Ð 25 Ð
5-7. SCHEMATIC  DIAGRAM  Ð MAIN Section Ð (3/3) ¥ See page 28 for IC Block Diagrams.
The components identified by mark ! or dotted
line with mark ! are critical for safety.
Replace only with part number specified.(Page 33) (Page 33) (Page 34)
(Page 24)
(Page 24) 

Ð 27 ÐÐ 28 Ð
¥ Waveforms
Ð AUDIO BOARD Ð
1T51 1
2Q51 C, Q52 C
3T81 4
4T91 46IC81 !Á, !ª
Ð MAIN BOARD (2/3) Ð1IC801 #Á
5IC81 7, 8
118 Vp-p
9.3 
µs
26.4 Vp-p
9.3 µs
63.2 Vp-p
9.3 µs
64.8 Vp-p
9.3 µs
6.4 Vp-p
9.3 µs
4.3 Vp-p
6 MHz
6.2 Vp-p
9.3 µs
¥ IC Block Diagrams
21
RECOUT
SCINL ANTSATMC3INMC4IN
HLSOUT MCBO
VCC IREF SCBOL
TCS2L TCS1LFBOL
TCF1L
TCF2L
4
LFIN
3
TCL2ZL2
59876
TCL1
SCINH
TCS1HZL1 HLSMP
MCTC
10111213
VCT
14
VEE
15
242526272829302021222319171816
TCS2HTCF2HFBOH
TCF1H
ANTSAT
FLVCRSLVCR
FHVCR...