Function Test - Zoom G2.1u Service Manual

Function Test

After repairing, the inspection should be performed with the built-in program for inspection.
※ Equipment required
· AC voltage meter (audio analyzer would be better)
· IHF-A filter (audio analyzer might include it)
· Oscillator
· AC adapter (AD-0006)
· Four batteries: R6 [SUM-3] or "AA" size (alkaline batteries are recommended)
· Cables
1. Starting Built-in Inspection Program
Connect the AC-adapter.
Turn on the power holding [TYPE +], [TYPE -], and [RHYTHM] keys.
Starting with TEST-mode, 7segment LED is displayed [8.8.], and all LEDs (except [TYPE +], [TYPE -],
and [STORE] keys) are light up.
2. PLAY / EDIT VOLUME check
Turn the [PLAY] dial clockwise and anticlockwise.
Make sure that the indications "00 -> 01 -> 02 -> 03 -> 04 -> 05 -> 06 -> 07 -> 08 -> 09 -> 0A"
display on the 7segment LED when the dial is turned clockwise.
Make sure that the indications "0A -> 09 -> 08 -> 07 -> 06 -> 05 -> 04 -> 03 -> 02 -> 01 -> 00"
display on the 7segment LED when the dial is turned anticlockwise.
And make sure that only 7segment LED turns on then.
3. DIAL / LED check
Turn the [GAIN] dial, and make sure that the [PATTERN] LED lights up.
Turn the [TONE] dial, and make sure that the [TEMPO] LED lights up.
Turn the [LEVEL] dial, and make sure that the [MIX] LED lights up.
And make sure that the indications "01 ->02 -> 03 ... ->Fd ->FE ->FF" appear on the 7segment
LED display when the dial is turned clockwise, and that "FF ->FE ->Fd ... 02 -> 01 -> 00"
when turned anticlockwise.
4. DSP-MUTE check
Press the [TYPE -] key, and make sure that all LEDs go out and output sound is mute.
Press the [TYPE -] key once more, and all LEDs turn on and output sound is emitted.
5. SRAM check
Press the [TYPE +] key, and make sure that the 7segment LED is displayed [2.P] and the delayed
signal is output from the left channel of [OUTPUT] jack.
6. BATTERY check
Press the [STORE] key, and make sure the 7segment LED is displayed the surveillance level of battery
voltage.
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