Sony PCM-M1 Service Manual ▷ View online
— 17 —
2-7.
CHASSIS ASSY
2-8.
DRUM ASSY
2
Screw
3
Screw
6
Screw
8
Screw (M1.4
×
1.4),
special head
8
Screw (M1.4
×
1.4),
special head
1
Screw, step
5
Holder (Cassette)
assy
7
Motor frexible
board
9
Opener, lid
4
Chassis assy
7
Screw (M1.4
×
1.4),
special head
1
Screw (M1.4
×
1.4)
special haed
8
Screw (M1.4
×
2.0),
locking
5
Screw (M1.4
×
1.4)
9
Drum assy
2
Motor, DC
4
Spring (Cleaner),
tension
3
Gear
(Mode B)
6
Lever (Cleaner),
tension
— 18 —
3-1.
ADJUSTMENTS
Notes on Adjustment
1.
Perform adjustments in the order given.
2.
Use the following test tapes.
TY-7111 (8-909-812-00) For playback level adjustment
TY-7915 (8-913-932-00) For tape pass and switching pulse adjustments
TY-30B (8-892-358-00) Blank tape
TY-7915 (8-913-932-00) For tape pass and switching pulse adjustments
TY-30B (8-892-358-00) Blank tape
Use the following torque meter.
TW-7131 (8-909-708-71) For tension adjustment
3.
Switch and knob positions
As indicated in the adjustment procedures.
SP/LP: SP 48kHz
REC LEVEL : MIC LIMITER
MIC/LINE IN : MIC
MIC ATT : 0dB
AVLS : NORM
SP/LP: SP 48kHz
REC LEVEL : MIC LIMITER
MIC/LINE IN : MIC
MIC ATT : 0dB
AVLS : NORM
4.
Apply DC 4.5 V power to the DC IN jack.
5.
For rotary head drum cleaning, press a piece of chamois leather (2-034-697-00) or a four-times folded clean knit fabric moistened with
small amount of alcohol against the drum lightly, and rotate the drum in counter-clockwise direction. (Rotate a few times.)
small amount of alcohol against the drum lightly, and rotate the drum in counter-clockwise direction. (Rotate a few times.)
Test mode
1.
Perform the adjustments in test mode.
2.
How to enter the test mode.
Press the STOP key, COUNTER key and OPEN button simultaneously when the main power is ON, to enter the test mode. Turn off the
main power to exit the test mode.
Press the STOP key, COUNTER key and OPEN button simultaneously when the main power is ON, to enter the test mode. Turn off the
main power to exit the test mode.
3.
When the machine enters the test mode, back light of the LCD turns on and the following initial display appears.
At the same time, the mechanism starts loading, and display of the select test mode code segment of the LCD turns on. (It normally
flashes.)
At the same time, the mechanism starts loading, and display of the select test mode code segment of the LCD turns on. (It normally
flashes.)
Initial display of LCD
Note:
The respective keys can be operated during test mode. The machine can mis-operate when the keys are operated during test most.
However, mis-operation of the machine can be cleared by pressing the STOP key. At the same time, tape will not be damaged by mis-
operation.
However, mis-operation of the machine can be cleared by pressing the STOP key. At the same time, tape will not be damaged by mis-
operation.
SECTION 3
ADJUSTMENTS
00
REMAIN
1 40 40
— 19 —
4.
Types of test mode
5.
How to set the test mode code
•
Test mode display
Note:
The display during the test mode can be changed by pressing the COUNTER key of the machine. However, confirm the current test
mode by selecting the test mode display (REMAIN).
1). The segment value of the test mode code can be incremented or decremented by pressing the MODE key (up) or the CLOCK key
(down).
MODE key (up)
MODE key (up)
→
01
→
02
→
20
→
21
→
22
→
23
→
24
→
25
→
30
→
31
→
32
→
40
→
42
→
43
→
44
→
99
→
01......
CLOCK key (down)
→
01
→
99
→
44
→
43
→
42
→
40
→
32
→
31
→
30
→
25
→
24
→
23
→
22
→
21
→
20
→
02
→
01......
2). The selected test mode code can be set by pressing the ENTER key. (The selected test mode code flashes before it is set.)
3). The speed mode can be incremented or decremented by pressing the VOLUME + key (up) or VOLUME - key (down).
VOLUME
+
key (up)
→ ×
1FWD
→ ×
0.5FWD
→ ×
1.5FWD
→ ×
3FWD
→ ×
25FWD
→ ×
4FWD
→ ×
1FWD......
VOLUME
−
key (down)
→ ×
1REV
→ ×
0.5REV
→ ×
1.5REV
→ ×
3REV
→ ×
25REV
→ ×
4REV
→ ×
1REV......
4). The error code can be reset by pressing the COUNTER RESET key during test mode.
5). Modify the adjustment value during the SWP (switching pulse) adjustment and the record current adjustment by pressing the VOLUME
+ key (up) or VOLUME - key (down).
Test mode code
Contents
01
Normal operating mode.
02
Error rate measurement mode.
20
21
22
21
22
Aging mode
23
(This is the mode for evaluation, and is
not used in service.
not used in service.
24
25
25
30
End sensor check mode.
(Pulse drive under condition of FF/REW.)
(Pulse drive under condition of FF/REW.)
31
End sensor check mode.
(Pulse drive under condition of REW.)
(Pulse drive under condition of REW.)
32
T-reel lock check mode.
(Under condition of FF/REW.)
(Under condition of FF/REW.)
40
Mechanism deck independent operation
mode.
mode.
42
Tape pass adjustment mode.
43
Record current adjustment mode
99
Error code history check mode.
— 20 —
6). The adjustment target can be selected during the record current adjustment (No. 43) by pressing the COUNTER RESET key.
The adjustment data must be saved in the EEPROM by pressing the LIGHT key.
6.
Test mode code
< Operation check mode >
1)
Set mode: 01
Displays error code which occurs during operation. (During test display)
Displays error code which occurs during operation. (During test display)
Linear counter, A-TIME
2)
Error rate measurement mode: 02
Measures error rate using a test tape or by self-recording/playback.
Error counter is displayed in the following display modes during playback.
Measures error rate using a test tape or by self-recording/playback.
Error counter is displayed in the following display modes during playback.
Linear count mode: A-channel error
A-TIME: B-channel error
A-TIME: B-channel error
3)
End sensor check mode: 30, 31
The end sensor LEDs are started to drive when either one of the following modes is set.
The end sensor LEDs are started to drive when either one of the following modes is set.
30: Pulse drive (2.9 ms cycle)
31: Under condition of the FWD mode (2.9 ms: ON/30 ms: OFF)
32: Under condition of the FF/FWD mode (2.9 ms cycle)
31: Under condition of the FWD mode (2.9 ms: ON/30 ms: OFF)
32: Under condition of the FF/FWD mode (2.9 ms cycle)
4)
Mechanism deck independent operation check: 40
The end sensor does not detect tape end when tape is not loaded. However the end sensor detects tape end when tape is loaded.
The FWD/REV speed can be incremented or decremented by pressing the VOLUME
The end sensor does not detect tape end when tape is not loaded. However the end sensor detects tape end when tape is loaded.
The FWD/REV speed can be incremented or decremented by pressing the VOLUME
+
(up) key or the VOLUME
−
(down) key.
5)
Tape pass adjustment mode: 42
The ATF-Servo SWP (switching pulse) adjustment is performed and the adjustment data is saved in EEPROM using this mode.
The ATF-Servo SWP (switching pulse) adjustment is performed and the adjustment data is saved in EEPROM using this mode.
6)
Record current adjustment model: 43
The record current adjustments for A-channel PCM, A-channel ATF, B-channel PCM and B-channel ATF are performed in this mode.
The adjustment values can be saved in EEPROM using this mode.
ATF servo during playback mode
The record current adjustments for A-channel PCM, A-channel ATF, B-channel PCM and B-channel ATF are performed in this mode.
The adjustment values can be saved in EEPROM using this mode.
ATF servo during playback mode
Capstan speed
Capstan speed code
Drum speed
code display
1
×
1FWD
2000rpm
2
×
0.5FWD
1000rpm
3
×
1.5FWD
2000rpm
4
×
3FWD
2000rpm
5
×
25FWD
2000rpm
6
×
4FWD
2000rpm
–1
×
1REV
2000rpm
–2
×
0.5REV
1000rpm
–3
×
1.5REV
2000rpm
–4
×
3REV
2000rpm
–5
×
25REV
2000rpm
–6
×
4REV
2000rpm
Adjustment target
Adjustment target
code display
0
A-ch PCM
1
A-ch ATF
2
B-ch PCM
3
B-ch ATF
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