DOWNLOAD Sony TC-WE625 / TC-WE725 / TC-WE825S / TC-WE835S Service Manual ↓ Size: 4.88 MB | Pages: 43 in PDF or view online for FREE

Model
TC-WE625 TC-WE725 TC-WE825S TC-WE835S
Pages
43
Size
4.88 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
tc-we625-tc-we725-tc-we825s-tc-we835s.pdf
Date
PREV: Sony TA-VA70 Service Manual

Sony TC-WE625 / TC-WE725 / TC-WE825S / TC-WE835S Service Manual ▷ View online

– 9 –
Record/Playback Head Azimuth Adjustment
DECK A    DECK B
Procedure:
1. Forward Playback Mode
2. Turn the adjustment screw for the maximum output levels. If
these levels do not match, turn the adjustment screw until both
of output levels match together within 1 dB.
3. Playback Mode
4. Change the reverse playback mode and repeat the steps 1 to 3.
5. After the adjustment, lock the adjustment screws with suitable
locking compound.
Adjustment Location: –record/playback head–
–
+
set
test tape
P-4-A100
(10 kHz, –10 dB)
level meter
LINE OUT
47 k
Ω
within
1 dB
within
1 dB
output
level
R-CH
peak
R-CH
peak
L-CH
peak
L-CH
peak
screw
position
screw position
–
+
–
+
V
H
Screen Pattern
set
In phase 45˚
90˚
135˚
180˚
good
wrong
47 k
Ω
47 k
Ω
L-CH
R-CH
test tape
P-4-A100
(10 kHz, –10 dB)
LINE OUT
oscilloscope
forward side
reverse side
adjustment screws
Tape Speed Adjustment     DECK A    DECK B
Procedure:
–Forward Playback Mode–
(High speed adjustment)
1. Set to test mode. (Refer to page 8.)
2. Set to FWD playback mode.
3. Twice pressing the HIGH/NORMAL switch.
4. Adjust RV72 so that the frequency counter reading becomes
6,000 
±
 20 Hz.
5. Release test mode after adjustment is completed.
(Normal speed adjustment)
1. Set to FWD playback mode.
2. Adjust RV71 so that the frequency counter reading becomes
3,000 
±
 10 Hz.
(Pitch control adjustment) (TC-WE725/WE825S only)
1. Push the PITCH CONTROL switch.
2. Set RV902 to mechanical center.
3. Set to FWD playback mode.
4. Adjust RV601 so that the frequency counter reading becomes
3,000 
±
 10 Hz.
Frequency difference between the beginning and the end of the tape
should be within 
±
 3%.
Frequency difference between the deck A and deck B the beginning
of the tape should be within 
±
 1.5%.
Adjustment Location: AUDIO board, MAIN board
                                       (See page 11.)
Playback Level Adjustment     DECK A    DECK B
Procedure:
–Forward Playback Mode–
–
+
set
frequency counter
47 k
Ω
LINE OUT
test tape
WS-48B
(3 kHz, 0 dB)
Adjust RV11 (L-CH) and RV21 (R-CH) so the level meter reading
becomes the adjustment limits below.
Adjustment Value:
LINE OUT level : –7.7 
±
 0.5 dB (0.301 to 0.338 V)
Level difference between channels : within 0.5 dB
Confirm that the LINE OUT level does not change in playback mode
while changing the mode from playback to stop several times.
Adjustment Location: AUDIO board (See page 11.)
–
+
set
test tape
P-4-L300
(315 Hz, 0 dB)
level meter
LINE OUT
47 k
Ω
– 10 –
Bias Consumption Current Adjustment
DECK A    DECK B
This adjustment should be performed when replacing the head assy
or the bias oscillator transformer (T81, T91).
Procedure:
1. Connect the digital voltmeter to test point TP81.
2. Set RV81 (L-CH), RV91 (R-CH) to mechanical center.
3. Set to FWD record mode.
4. Adjust T81 (L-CH), T91 (R-CH) so that the digital voltmeter
reading becomes minimum.
Adjustment Value: Maximum 220 mV
Adjustment Location: AUDIO board (See page 11.)
Record Bias Adjustment     DECK A    DECK B
Setting:
REC LEVEL control : standard record position (See page 8.)
Procedure:
1. Record Mode
set
1
2
3
–
+
blank tape
CS-413
TP81
L-CH
R-CH
digital
voltmeter
LINE IN
no signal
2. Playback Mode
set
AF OSC
attenuator
10 k
Ω
600 
Ω
LINE IN
1) 315 Hz
2) 10 kHz
38.8 mV (–26 dB)
blank tape
CS-123
Confirm that the 10 kHz playback output is 0 
±
 0.5 dB relative to
the 315 Hz output. If necessary, adjust RV81 (L-CH), RV91 (R-
CH) and repeat the steps given above.
Adjustment Location: AUDIO board (See page 11.)
–
+
set
recorded
portion
level meter
LINE OUT
47 k
Ω
Record Level Adjustment     DECK A    DECK B
Setting:
REC LEVEL control : standard record position (See page 8.)
Procedure:
1. Record Mode
2. Playback Mode
set
AF OSC
attenuator
10 k
Ω
600 
Ω
LINE IN
blank tape
CS-123
315 Hz, 38.8 mV (–26 dB)
Confirm playback the tape recorded become adjustment level as
follows.
If necessary, adjust Deck A : RV102 (L-CH), RV202 (R-CH) and
Deck B : RV101 (L-CH), RV201 (R-CH) and repeat the steps 1 and
2.
Adjustment Value:
LINE OUT level : –26 
±
 0.5 dB (36.7 to 41.1 mV)
Adjustment Location: MAIN board (See page 11.)
–
+
set
recorded
portion
level meter
LINE OUT
47 k
Ω
– 11 –
Adjustment Location:
–audio board (component side)–
RV91
(R)
RECORD BIAS ADJ
RV81
(L)
RV72 (HIGH)
TAPE SPEED ADJ
PLAYBACK 
LEVEL
ADJ
RV71 (NORMAL)
RV21 (R)
RV11 (L)
T81 (L)
T91 (R)
BIAS
CONSUMPTION
 CURRENT
ADJ
TP81
RV101
(L)
RECORD LEVEL ADJ
(DECK B)
RV201
(R)
RV202
(R)
RECORD LEVEL ADJ
(DECK A)
RV102
(L)
RV601
TAPE SPEED ADJ
(PITCH CONTROL)
–main board (component side)–
– 12 –
5-1. IC PIN DESCRIPTION
• IC801 CXP82432A-006Q (SYSTEM CONTROLLER)
Pin No.
Pin Name
I/O
Pin Description
1
T-REEL (A)
I
Take-up reel rotation detection input (DECK A)
2
S-REEL (B)
I
Supply reel rotation detection input (DECK B)
3
T-REEL (B)
I
Take-up reel rotation detection input (DECK B)
4
SIRCS IN
I
Sircs signal input
5
POWER IN
I
Power-off detection input
6
VOL OUT
O
Record level control output (PWM)
7
A/B SEL
I
Playback A/B selector input “L” : A, “H” : B
8
CONTROL-A IN
I
Control A signal input
9
CONTRL-A OUT
O
Control A signal output
10
REC MUTE (A)
O
Recording mute output (DECK A) “L” : Mute ON
11
REC CAL 0 (A)
O
Recording CAL-0 output for auto calibration. (DECK A)
12
REC CAL 1 (A)
O
Recording CAL-1 output for auto calibration. (DECK A)
13
GP CAL 0 (A)
O
GEQ CAL-0 output for auto calibration. (DECK A)
14
GP CAL 1 (A)
O
GEQ CAL-1 output for auto calibration. (DECK A)
15
REC/PB
O
Record/playback dolby NR mode selector output “L” : Playback
16
REC MUTE (B)
O
Recording mute output (DECK B) “L” : Mute ON
17
AMS IN
I
AMS signal input “L” : Music present
18
CAL/OFF/S
O
Audio selector “H” : CAL, “Open” : Dolby off, “L” : Dolby S
19
C/B/OFF
O
Dolby selector “H” : C, “Open” : B, “L” : Dolby off
20
REC CAL 0 (B)
O
Recording CAL-0 output for auto calibration. (DECK B)
21
REC CAL 1 (B)
O
Recording CAL-1 output for auto calibration. (DECK B)
22
GP CAL 0 (B)
O
GEQ CAL-0 output for auto calibration. (DECK B)
23
GP CAL 1 (B)
O
GEQ CAL-1 output for auto calibration. (DECK B)
24
POWER OUT
O
Power hold output
25
RECEQ HIGH/NORM
O
REC EQ high/normal select output “L” : Normal
26
PASS/MUTE/DOLBY
O
Audio selector “H” : Pass, “Open” : Mute, “L” : Dolby
27
BS/AMS/OFF
O
AMS amp selector “H” : BS, “Open” : AMS, “L” : OFF
28
EX IN 0
I
Expander control input (0)
29
EX IN 1
I
Expander control input (1)
30
EXP CTRL 0
O
Expander control output (0)
31
EXP CTRL 1
O
Expander control output (1)
32
A/D IN 0
I
Expander A/D input (0)
33
A/D IN 1
I
Expander A/D input (1)
34
KEY 5
I
Key 5 input (A/D converter)
35
VOL IN
I
Record volume input (A/D converter)
36
TEST/PITCH/VER
I
Test mode/pitch control/version input
37
CD SYNC LED
O
CD SYNCHRO LED driver “L” : ON
38
RESET
I
System reset input
39
EXTAL
I
System clock oscillator input (10 MHz)
40
XTAL
O
System clock oscillator output (10 MHz)
41
VSS
—
Ground
42
TX
—
Connected to ground.
43
TEX
—
Connected to ground.
44
ARL LED
O
ARL LED driver “H” : ON
45
PITCH ON/OFF
O
Pitch control ON/OFF output “L” : ON
46
AVREF
I
Reference voltage input for A/D converter.
47
AVSS
—
Ground for A/D converter.
48
LINE MUTE
O
Line mute ON/OFF control output “L” : Mute ON
49
OSC H/L
O
OSC frequency H/L select output for auto calibration.
50
OSC ON/OFF
O
OSC ON/OFF select output for auto calibration.
51
BIAS CAL 0 (B)
O
EQ bias CAL-0 output for auto calibration. (DECK B)
SECTION 5
DIAGRAMS
Page of 43
Display

Click on the first or last page to see other TC-WE625 / TC-WE725 / TC-WE825S / TC-WE835S service manuals if exist.

RANDOM: