Sony Walkman PCM-M1 Service Manual page 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)
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.
Linear count mode: A-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.
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)
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
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.
Capstan speed
code display
1
2
3
4
5
6
–1
–2
–3
–4
–5
–6
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
Adjustment target
Adjustment target
code display
0 A-ch PCM
1
2
3
Capstan speed code
1FWD
0.5FWD
1.5FWD
3FWD
25FWD
4FWD
1REV
0.5REV
1.5REV
3REV
25REV
4REV
A-ch ATF
B-ch PCM
B-ch ATF
(up) key or the VOLUME
Drum speed
2000rpm
1000rpm
2000rpm
2000rpm
2000rpm
2000rpm
2000rpm
1000rpm
2000rpm
2000rpm
2000rpm
2000rpm
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(down) key.