Troubleshooting

5-1 PRELIMINARY PROCEDURES↑ TOP

If a problem should occur with the recorder, check that the following items are correct before proceeding with troubleshooting procedures. As an aid in troubleshooting, refer to the schematic diagram and parts lists included in this manual.

1. Head stacks are cleaned and demagnetized.
2. Head azimuth and height are correct.
3. Record bias has been adjusted properly.
4. Recommended tape has been used.
5. Input and/or output connectors are correctly wired.
6. Ac line voltage is within ± 10% of indicated power requirement.
7. All operational switches have been correctly set.
8. Adjustment procedures have been correctly made using accurate test equipment.

5-2 TROUBLESHOOTING HINTS↑ TOP

Some of the more common problems and possible causes are listed in Table 5-1.

Table 5-1 Troubleshooting Hints

SYMPTOM	POSSIBLE CAUSE
Power switch is on but meters do not illuminate and transport does not function.	Fuse is blown, ac power cord is defective, or power switch is defective.
Transport function and meters illuminate but no recording and reproducing	Power source for amplifier (+29Vdc)' [sic] is defective.
Transport does not function.	Power source for control (+24Vdc) is defective.
Capstan shaft does not rotate	Tension arm safety switch is defective. On models 2S or 4S, capstan motor is defective or capstan belt come off[sic]. On Models 2SD or 4SD, power source for capstan motor (+24Vdc or +5Vdc) is defective, or fuse of the power supply is blown.
No PLAY mode function	Control circuit (PA-284) is defective (Tr8,9,SCR2,3))[sic], or pinch roller solenoid is defective.
No FAST FORWARD mode function	Control circuit (PA-284) is defective (Tr 3,4, SCR 1).
No REWIND mode function	Control circuit (PA-284) is defective (Tr2).
Record lamp of transport does not illuminate and no RECORD mode function	Control circuit (PA-284) is defective (Tr10, SCR4)
Brake solenoide[sic] does not move.	Control circuit (PA-284) is defective (Tr5), or brake solenoi--lenoide[sic] is defective, or brake adjustment is incorrect (strok)[sic].
Tape speed is incorrect	Pinch roller adjustment is incorrect (not bottomed), or dirty pinch roller, dirty capstan shaft. On models 2S or 4S, loose or dirty capstan belt slips, or capstan motor is defective. On models 2SD or 4SD; capstan servo control circuit is defective, or adjusted incorrectly. Pitch control nob[sic] is at wrong position.
Output level is wrong	Reproduce head switch is at wrong position, or output level switch is wrong position.